Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping
Ni-rich and low-Co cathodes (LiNi x Co y Mn 1− x − y O 2 , x > 0.9, y ≤ 0.03) have the advantages of high capacity and low cost. However, the sharp increase in polarization upon cycling is unfavorable to the cycling performance. Herein, the mechanism of polarization increase is explored in detail...
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| Veröffentlicht in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-04, Vol.8 (14), p.6893-691 |
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| creator | Zhang, Chunfang Wan, Jiajia Li, Yixiao Zheng, Shiyao Zhou, Ke Wang, Donghao Wang, Danfeng Hong, Chaoyu Gong, Zhengliang Yang, Yong |
| description | Ni-rich and low-Co cathodes (LiNi
x
Co
y
Mn
1−
x
−
y
O
2
,
x
> 0.9,
y
≤ 0.03) have the advantages of high capacity and low cost. However, the sharp increase in polarization upon cycling is unfavorable to the cycling performance. Herein, the mechanism of polarization increase is explored in detail, and Al-doping is proposed to restrain the polarization increase upon cycling. First, the electrochemistry test,
in situ
XRD, GITT and EIS are combined to provide new insights for understanding the polarization increase process. In addition, the mechanism of Al-doping which suppresses the polarization increase is also investigated. During cycling, the main cause for the increased polarization of Al-free LiNi
0.94
Co
0.03
Mn
0.03
O
2
(NCM 94) cathodes is attributed to kinetic reasons. It is worth noting that the change of Li dynamics and charge-transfer impedance is more obvious at high SOC, which is consistent with the evolution of polarization. In contrast, because of the stabilizing effect of Al-doping on the structure, Al-doped LiNi
0.92
Co
0.03
Mn
0.03
Al
0.02
O
2
(NCMA 92) cathodes can alleviate polarization increase during prolonged cycling. In detail, Al-doping reduces mechanical strain and relieves the accumulation of local internal stress at high SOC, which is conducive to improving the structural stability, maintaining the connection between primary particles, reducing the surface degradation along microcracks, and thus suppressing the deterioration of the electrochemical kinetics during cycling. Benefiting from the alleviative polarization increase, the NCMA 92 cathodes demonstrate a capacity retention of 92% after 100 cycles, while the NCM 94 only 69%. In this article, the insights on the polarization increase process of Ni-rich and low-Co cathodes will further help in the understanding of their cycling behavior and contribute to the efforts of improving their electrochemical performance.
This work investigates the mechanism of polarization increase upon cycling and explores the causes of Al-doping restraining polarization increase. |
| doi_str_mv | 10.1039/d0ta00260g |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2386935446</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2386935446</sourcerecordid><originalsourceid>FETCH-LOGICAL-c344t-41549463a32e721eee110f64d4bf604d5f74c7131ce13797f1afc069aa056ee23</originalsourceid><addsrcrecordid>eNp9kM1LAzEQxYMoWKoX70LEm7A62WSzm2OpWoWiIPXqkuajTVk3a7JF6l9vaqXenMvMgx9veA-hMwLXBKi40dBLgJzD4gANciggK5ngh_u7qo7RaYwrSFMBcCEG6O3FxD5I17p2gfulwZ1vZHBfsne-xa5VwchosLf4yWXBqSWWrcaN_8zGHivZL702Ea-7BKuNarYu8w0eNZn2XRIn6MjKJprT3z1Er_d3s_FDNn2ePI5H00xRxvqMkYIJxqmkuSlzYowhBCxnms0tB6YLWzJVEkqUIbQUpSXSqhRASii4MTkdosudbxf8xzpFqld-Hdr0ss5pxQUtWLIfoqsdpYKPMRhbd8G9y7CpCdTbCutbmI1-Kpwk-GIHh6j23F_FdadtYs7_Y-g369h4AA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2386935446</pqid></control><display><type>article</type><title>Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping</title><source>Royal Society Of Chemistry Journals 2008-</source><creator>Zhang, Chunfang ; Wan, Jiajia ; Li, Yixiao ; Zheng, Shiyao ; Zhou, Ke ; Wang, Donghao ; Wang, Danfeng ; Hong, Chaoyu ; Gong, Zhengliang ; Yang, Yong</creator><creatorcontrib>Zhang, Chunfang ; Wan, Jiajia ; Li, Yixiao ; Zheng, Shiyao ; Zhou, Ke ; Wang, Donghao ; Wang, Danfeng ; Hong, Chaoyu ; Gong, Zhengliang ; Yang, Yong</creatorcontrib><description>Ni-rich and low-Co cathodes (LiNi
x
Co
y
Mn
1−
x
−
y
O
2
,
x
> 0.9,
y
≤ 0.03) have the advantages of high capacity and low cost. However, the sharp increase in polarization upon cycling is unfavorable to the cycling performance. Herein, the mechanism of polarization increase is explored in detail, and Al-doping is proposed to restrain the polarization increase upon cycling. First, the electrochemistry test,
in situ
XRD, GITT and EIS are combined to provide new insights for understanding the polarization increase process. In addition, the mechanism of Al-doping which suppresses the polarization increase is also investigated. During cycling, the main cause for the increased polarization of Al-free LiNi
0.94
Co
0.03
Mn
0.03
O
2
(NCM 94) cathodes is attributed to kinetic reasons. It is worth noting that the change of Li dynamics and charge-transfer impedance is more obvious at high SOC, which is consistent with the evolution of polarization. In contrast, because of the stabilizing effect of Al-doping on the structure, Al-doped LiNi
0.92
Co
0.03
Mn
0.03
Al
0.02
O
2
(NCMA 92) cathodes can alleviate polarization increase during prolonged cycling. In detail, Al-doping reduces mechanical strain and relieves the accumulation of local internal stress at high SOC, which is conducive to improving the structural stability, maintaining the connection between primary particles, reducing the surface degradation along microcracks, and thus suppressing the deterioration of the electrochemical kinetics during cycling. Benefiting from the alleviative polarization increase, the NCMA 92 cathodes demonstrate a capacity retention of 92% after 100 cycles, while the NCM 94 only 69%. In this article, the insights on the polarization increase process of Ni-rich and low-Co cathodes will further help in the understanding of their cycling behavior and contribute to the efforts of improving their electrochemical performance.
This work investigates the mechanism of polarization increase upon cycling and explores the causes of Al-doping restraining polarization increase.</description><identifier>ISSN: 2050-7488</identifier><identifier>EISSN: 2050-7496</identifier><identifier>DOI: 10.1039/d0ta00260g</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Aluminum ; Cathodes ; Cathodic polarization ; Charge transfer ; Cycles ; Doping ; Electrochemical analysis ; Electrochemistry ; Electrode polarization ; Mechanical stimuli ; Microcracks ; Nickel ; Polarization ; Residual stress ; Strain ; Structural stability</subject><ispartof>Journal of materials chemistry. A, Materials for energy and sustainability, 2020-04, Vol.8 (14), p.6893-691</ispartof><rights>Copyright Royal Society of Chemistry 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c344t-41549463a32e721eee110f64d4bf604d5f74c7131ce13797f1afc069aa056ee23</citedby><cites>FETCH-LOGICAL-c344t-41549463a32e721eee110f64d4bf604d5f74c7131ce13797f1afc069aa056ee23</cites><orcidid>0000-0003-4671-4044 ; 0000-0002-9928-7165</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Zhang, Chunfang</creatorcontrib><creatorcontrib>Wan, Jiajia</creatorcontrib><creatorcontrib>Li, Yixiao</creatorcontrib><creatorcontrib>Zheng, Shiyao</creatorcontrib><creatorcontrib>Zhou, Ke</creatorcontrib><creatorcontrib>Wang, Donghao</creatorcontrib><creatorcontrib>Wang, Danfeng</creatorcontrib><creatorcontrib>Hong, Chaoyu</creatorcontrib><creatorcontrib>Gong, Zhengliang</creatorcontrib><creatorcontrib>Yang, Yong</creatorcontrib><title>Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping</title><title>Journal of materials chemistry. A, Materials for energy and sustainability</title><description>Ni-rich and low-Co cathodes (LiNi
x
Co
y
Mn
1−
x
−
y
O
2
,
x
> 0.9,
y
≤ 0.03) have the advantages of high capacity and low cost. However, the sharp increase in polarization upon cycling is unfavorable to the cycling performance. Herein, the mechanism of polarization increase is explored in detail, and Al-doping is proposed to restrain the polarization increase upon cycling. First, the electrochemistry test,
in situ
XRD, GITT and EIS are combined to provide new insights for understanding the polarization increase process. In addition, the mechanism of Al-doping which suppresses the polarization increase is also investigated. During cycling, the main cause for the increased polarization of Al-free LiNi
0.94
Co
0.03
Mn
0.03
O
2
(NCM 94) cathodes is attributed to kinetic reasons. It is worth noting that the change of Li dynamics and charge-transfer impedance is more obvious at high SOC, which is consistent with the evolution of polarization. In contrast, because of the stabilizing effect of Al-doping on the structure, Al-doped LiNi
0.92
Co
0.03
Mn
0.03
Al
0.02
O
2
(NCMA 92) cathodes can alleviate polarization increase during prolonged cycling. In detail, Al-doping reduces mechanical strain and relieves the accumulation of local internal stress at high SOC, which is conducive to improving the structural stability, maintaining the connection between primary particles, reducing the surface degradation along microcracks, and thus suppressing the deterioration of the electrochemical kinetics during cycling. Benefiting from the alleviative polarization increase, the NCMA 92 cathodes demonstrate a capacity retention of 92% after 100 cycles, while the NCM 94 only 69%. In this article, the insights on the polarization increase process of Ni-rich and low-Co cathodes will further help in the understanding of their cycling behavior and contribute to the efforts of improving their electrochemical performance.
This work investigates the mechanism of polarization increase upon cycling and explores the causes of Al-doping restraining polarization increase.</description><subject>Aluminum</subject><subject>Cathodes</subject><subject>Cathodic polarization</subject><subject>Charge transfer</subject><subject>Cycles</subject><subject>Doping</subject><subject>Electrochemical analysis</subject><subject>Electrochemistry</subject><subject>Electrode polarization</subject><subject>Mechanical stimuli</subject><subject>Microcracks</subject><subject>Nickel</subject><subject>Polarization</subject><subject>Residual stress</subject><subject>Strain</subject><subject>Structural stability</subject><issn>2050-7488</issn><issn>2050-7496</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kM1LAzEQxYMoWKoX70LEm7A62WSzm2OpWoWiIPXqkuajTVk3a7JF6l9vaqXenMvMgx9veA-hMwLXBKi40dBLgJzD4gANciggK5ngh_u7qo7RaYwrSFMBcCEG6O3FxD5I17p2gfulwZ1vZHBfsne-xa5VwchosLf4yWXBqSWWrcaN_8zGHivZL702Ea-7BKuNarYu8w0eNZn2XRIn6MjKJprT3z1Er_d3s_FDNn2ePI5H00xRxvqMkYIJxqmkuSlzYowhBCxnms0tB6YLWzJVEkqUIbQUpSXSqhRASii4MTkdosudbxf8xzpFqld-Hdr0ss5pxQUtWLIfoqsdpYKPMRhbd8G9y7CpCdTbCutbmI1-Kpwk-GIHh6j23F_FdadtYs7_Y-g369h4AA</recordid><startdate>20200414</startdate><enddate>20200414</enddate><creator>Zhang, Chunfang</creator><creator>Wan, Jiajia</creator><creator>Li, Yixiao</creator><creator>Zheng, Shiyao</creator><creator>Zhou, Ke</creator><creator>Wang, Donghao</creator><creator>Wang, Danfeng</creator><creator>Hong, Chaoyu</creator><creator>Gong, Zhengliang</creator><creator>Yang, Yong</creator><general>Royal Society of Chemistry</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7SR</scope><scope>7ST</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>JG9</scope><scope>L7M</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-4671-4044</orcidid><orcidid>https://orcid.org/0000-0002-9928-7165</orcidid></search><sort><creationdate>20200414</creationdate><title>Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping</title><author>Zhang, Chunfang ; Wan, Jiajia ; Li, Yixiao ; Zheng, Shiyao ; Zhou, Ke ; Wang, Donghao ; Wang, Danfeng ; Hong, Chaoyu ; Gong, Zhengliang ; Yang, Yong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c344t-41549463a32e721eee110f64d4bf604d5f74c7131ce13797f1afc069aa056ee23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Aluminum</topic><topic>Cathodes</topic><topic>Cathodic polarization</topic><topic>Charge transfer</topic><topic>Cycles</topic><topic>Doping</topic><topic>Electrochemical analysis</topic><topic>Electrochemistry</topic><topic>Electrode polarization</topic><topic>Mechanical stimuli</topic><topic>Microcracks</topic><topic>Nickel</topic><topic>Polarization</topic><topic>Residual stress</topic><topic>Strain</topic><topic>Structural stability</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Chunfang</creatorcontrib><creatorcontrib>Wan, Jiajia</creatorcontrib><creatorcontrib>Li, Yixiao</creatorcontrib><creatorcontrib>Zheng, Shiyao</creatorcontrib><creatorcontrib>Zhou, Ke</creatorcontrib><creatorcontrib>Wang, Donghao</creatorcontrib><creatorcontrib>Wang, Danfeng</creatorcontrib><creatorcontrib>Hong, Chaoyu</creatorcontrib><creatorcontrib>Gong, Zhengliang</creatorcontrib><creatorcontrib>Yang, Yong</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Environment Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Journal of materials chemistry. A, Materials for energy and sustainability</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Chunfang</au><au>Wan, Jiajia</au><au>Li, Yixiao</au><au>Zheng, Shiyao</au><au>Zhou, Ke</au><au>Wang, Donghao</au><au>Wang, Danfeng</au><au>Hong, Chaoyu</au><au>Gong, Zhengliang</au><au>Yang, Yong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping</atitle><jtitle>Journal of materials chemistry. A, Materials for energy and sustainability</jtitle><date>2020-04-14</date><risdate>2020</risdate><volume>8</volume><issue>14</issue><spage>6893</spage><epage>691</epage><pages>6893-691</pages><issn>2050-7488</issn><eissn>2050-7496</eissn><abstract>Ni-rich and low-Co cathodes (LiNi
x
Co
y
Mn
1−
x
−
y
O
2
,
x
> 0.9,
y
≤ 0.03) have the advantages of high capacity and low cost. However, the sharp increase in polarization upon cycling is unfavorable to the cycling performance. Herein, the mechanism of polarization increase is explored in detail, and Al-doping is proposed to restrain the polarization increase upon cycling. First, the electrochemistry test,
in situ
XRD, GITT and EIS are combined to provide new insights for understanding the polarization increase process. In addition, the mechanism of Al-doping which suppresses the polarization increase is also investigated. During cycling, the main cause for the increased polarization of Al-free LiNi
0.94
Co
0.03
Mn
0.03
O
2
(NCM 94) cathodes is attributed to kinetic reasons. It is worth noting that the change of Li dynamics and charge-transfer impedance is more obvious at high SOC, which is consistent with the evolution of polarization. In contrast, because of the stabilizing effect of Al-doping on the structure, Al-doped LiNi
0.92
Co
0.03
Mn
0.03
Al
0.02
O
2
(NCMA 92) cathodes can alleviate polarization increase during prolonged cycling. In detail, Al-doping reduces mechanical strain and relieves the accumulation of local internal stress at high SOC, which is conducive to improving the structural stability, maintaining the connection between primary particles, reducing the surface degradation along microcracks, and thus suppressing the deterioration of the electrochemical kinetics during cycling. Benefiting from the alleviative polarization increase, the NCMA 92 cathodes demonstrate a capacity retention of 92% after 100 cycles, while the NCM 94 only 69%. In this article, the insights on the polarization increase process of Ni-rich and low-Co cathodes will further help in the understanding of their cycling behavior and contribute to the efforts of improving their electrochemical performance.
This work investigates the mechanism of polarization increase upon cycling and explores the causes of Al-doping restraining polarization increase.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/d0ta00260g</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-4671-4044</orcidid><orcidid>https://orcid.org/0000-0002-9928-7165</orcidid></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 2050-7488 |
| ispartof | Journal of materials chemistry. A, Materials for energy and sustainability, 2020-04, Vol.8 (14), p.6893-691 |
| issn | 2050-7488 2050-7496 |
| language | eng |
| recordid | cdi_proquest_journals_2386935446 |
| source | Royal Society Of Chemistry Journals 2008- |
| subjects | Aluminum Cathodes Cathodic polarization Charge transfer Cycles Doping Electrochemical analysis Electrochemistry Electrode polarization Mechanical stimuli Microcracks Nickel Polarization Residual stress Strain Structural stability |
| title | Restraining the polarization increase of Ni-rich and low-Co cathodes upon cycling by Al-doping |
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