Slurryless Li2S/Reduced Graphene Oxide Cathode Paper for High-Performance Lithium Sulfur Battery

Slurryless Li2S/Reduced Graphene Oxide Cathode Paper for High-Performance Lithium Sulfur Battery

Lithium sulfide (Li2S) is a promising cathode material for Li–S batteries with high capacity (theoretically 1166 mAh g–1) and can be paired with nonlithium–metal anodes to avoid potential safety issues. However, the cycle life of coarse Li2S particles suffers from poor electronic conductivity and po...

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Veröffentlicht in:Nano letters 2015-03, Vol.15 (3), p.1796-1802
Hauptverfasser: Wang, Chao, Wang, Xusheng, Yang, Yuan, Kushima, Akihiro, Chen, Jitao, Huang, Yunhui, Li, Ju
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container_end_page 1802
container_issue 3
container_start_page 1796
container_title Nano letters
container_volume 15
creator Wang, Chao
Wang, Xusheng
Yang, Yuan
Kushima, Akihiro
Chen, Jitao
Huang, Yunhui
Li, Ju
description Lithium sulfide (Li2S) is a promising cathode material for Li–S batteries with high capacity (theoretically 1166 mAh g–1) and can be paired with nonlithium–metal anodes to avoid potential safety issues. However, the cycle life of coarse Li2S particles suffers from poor electronic conductivity and polysulfide shuttling. Here, we develop a flexible slurryless nano-Li2S/reduced graphene oxide cathode paper (nano-Li2S/rGO paper) by simple drop-coating. The Li2S/rGO paper can be directly used as a free-standing and binder-free cathode without metal substrate, which leads to significant weight savings. It shows excellent rate capability (up to 7 C) and cycle life in coin cell tests due to the high electron conductivity, flexibility, and strong solvent absorbency of rGO paper. The Li2S particles that precipitate out of the solvent on rGO have diameters 25–50 nm, which is in contrast to the 3–5 μm coarse Li2S particles without rGO.
doi_str_mv 10.1021/acs.nanolett.5b00112
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title Slurryless Li2S/Reduced Graphene Oxide Cathode Paper for High-Performance Lithium Sulfur Battery
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