Optimizition of Graphite-SiO blend electrodes for lithium ion batteries: Stable cycling enabled by single-walled carbon nanotube conductive additive

JOURNAL OF POWER SOURCES

卷:450

Article

Kirner, Joel¹  Qin, Yan¹  Zhang, Linghong¹  Jansen, Andrew¹  Lu, Wenquan¹ 

[1] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA

关键词: Silicon monoxide;    Graphite;    Blend electrode;    Carbon nanotube;    Lithium-ion battery;   

DOI  :  10.1016/j.jpowsour.2020.227711

来源: Elsevier

【 摘 要 】

Lithium-alloying materials are of great interest to improve the gravimetric and volumetric energy density of lithium-ion batteries, though their associated volume fluctuation with cycling often leads to poor cycling performance. Active-inactive alloys and blending alloys with carbon materials are common strategies to accommodate volume fluctuation. Herein we set out to optimize graphite-SiO blend electrode formulations to eliminate rapid capacity fade. Electrodes with highly stable cycling were prepared by simple planetary mixing procedures, enabled by the use of just a fraction of a weight percent of commercial SWCNTs as the only conductive additive, and by the appropriate choice of binder/stabilizing agent. In fact, the use of SWCNTs allowed for graphite-free SiO electrodes with approximately 74% higher volumetric energy density relative to traditional graphite electrodes, and superior capacity retention in coin-type full-cell testing versus NMC532 cathodes.

【 授权许可】

Free