NEGATIVE ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, SECONDARY BATTERY, AND ELECTRIC DEVICE

The present application provides a negative electrode sheet and a preparation method therefor, a secondary battery, and an electric device. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer arranged on the negative electrode...

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Bibliographische Detailangaben
Hauptverfasser: LI, Xiaowei, PEI, Zhenxing, NIU, Congsu, FENG, Nianyun, WEI, Kaining
Format: Patent
Sprache:chi ; eng ; fre
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Zusammenfassung:The present application provides a negative electrode sheet and a preparation method therefor, a secondary battery, and an electric device. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer arranged on the negative electrode current collector. The negative electrode active material layer comprises a negative electrode active material and an additive. The additive comprises a shell wall and a cavity located on the inner side of the shell wall. The thickness of the shell wall is denoted as d, the volume of the cavity is denoted as Vh, the volume of the additive is denoted as Vw, and the additive satisfies 20 nm≤d≤300 nm and 40%≤Vh/Vw≤90%. The present application can effectively reduce the expansion force of secondary batteries, thereby improving the safety performance of the secondary batteries. La présente demande concerne une feuille d'électrode négative et son procédé de préparation, une batterie secondaire et un dispositif électrique