ZnO-Embedded Expanded Graphite Composite Anodes with Controlled Charge Storage Mechanism Enabling Operation of Lithium-Ion Batteries at Ultra-Low Temperatures

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外文摘要：As lithium(Li)-ion batteries expand their applications,operating over a wide temperature range becomes increasingly important.However,the low-temperature performance of conventional graphite anodes is severely hampered by the poor diffusion kinetics of Li ions(Li+).Here,zinc oxide(ZnO)nanoparticles are incorporated into the expanded graphite to improve Li+diffusion kinetics,resulting in a significant improvement in low-temperature performance.The ZnO-embedded expanded graphite anodes are investigated with different amounts of ZnO to establish the structure-charge storage mechanism-performance relationship with a focus on low-temperature applications.Electrochemical analysis reveals that the ZnO-embedded expanded graphite anode with nano-sized ZnO maintains a large portion of the diffusion-controlled charge storage mechanism at an ultra-low temperature of-50 ℃.Due to this significantly enhanced Li+diffusion rate,a full cell with the ZnO-embedded expanded graphite anode and a LiNi0.88Co0.09Al0.03O2 cathode delivers high capacities of 176 mAh g-1 at 20 ℃ and 86 mAh g-1 at-50 ℃ at a high rate of 1 C.The outstanding low-temperature performance of the composite anode by improving the Li+diffusion kinetics provides important scientific insights into the fundamental design principles of anodes for low-temperature Li-ion battery operation.

外文关键词：

diffusive and capacitive charge storagesexpanded graphite composites anodelithium-ion batterylow-temperature operationtransition metal oxide

作者：

Kun Ryu、Michael J.Lee、Kyungbin Lee、Seung Woo Lee

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作者单位：

George W.Woodruff School of Mechanical Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA

基金：

Early Career Faculty Grant from NASA's Space Technology Research Grants ProgramInstitute for Electronics and Nanotechnology Seed GrantGeorgia Tech Institute for Electronics and NanotechnologyNational Nanotechnology Coordinated Infrastructure(NNCI)National Science Foundation

项目编号：

80NSSC18K1509ECCS-2025462

出版年：

2023

DOI：

10.1002/eem2.12662

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(4)

参考文献量53