Probing the aging effects on nanomechanical properties of a LiFePO4 cathode in a large format prismatic cell

JOURNAL OF POWER SOURCES

卷:280

Article

Demirocak, Dervis Emre¹  Bhushan, Bharat¹ 

[1] Ohio State Univ, Nanoprobe Lab Bio & Nanotechnol & Biomimet, Columbus, OH 43210 USA

关键词: Li-ion battery;    Mechanical properties;    Atomic force microscopy;    Nanoindentation;    Aging;    Prismatic LiFePO4;   

DOI  :  10.1016/j.jpowsour.2015.01.114

来源: Elsevier

【 摘 要 】

Li-ion batteries offer great promise for the future of energy storage due to their superior gravimetric and volumetric energy density. One of the challenges in promoting their expanded use is to improve the cycle life of Li-ion batteries. This requires detailed understanding of the aging phenomenon. The aging mechanism of Li-ion batteries can have both chemical and mechanical origins. While the chemical degradation mechanisms have been studied extensively, mechanical degradation mechanisms have received little attention so far. In this study, we probe the changes in mechanical properties of a LiFePO4 cathode in a large format prismatic cell. Results indicate that mechanical degradation increases by aging; in addition, local degradation is observed in the composite cathode. Implications of the degradation in mechanical properties on binder degradation are discussed in detail. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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