材料科学
压延
阳极
石墨
复合数
多孔性
复合材料
电极
碳纤维
物理化学
化学
作者
Yeonguk Son,Namhyung Kim,Taeyong Lee,Yoon‐Kwang Lee,Jiyoung Ma,Sujong Chae,Jaekyung Sung,Hyungyeon Cha,Youngshin Yoo,Jaephil Cho
标识
DOI:10.1002/adma.202003286
摘要
Abstract Porous strategies based on nanoengineering successfully mitigate several problems related to volume expansion of alloying anodes. However, practical application of porous alloying anodes is challenging because of limitations such as calendering incompatibility, low mass loading, and excessive usage of nonactive materials, all of which cause a lower volumetric energy density in comparison with conventional graphite anodes. In particular, during calendering, porous structures in alloying‐based composites easily collapse under high pressure, attenuating the porous characteristics. Herein, this work proposes a calendering‐compatible macroporous architecture for a Si–graphite anode to maximize the volumetric energy density. The anode is composed of an elastic outermost carbon covering, a nonfilling porous structure, and a graphite core. Owing to the lubricative properties of the elastic carbon covering, the macroporous structure coated by the brittle Si nanolayer can withstand high pressure and maintain its porous architecture during electrode calendering. Scalable methods using mechanical agitation and chemical vapor deposition are adopted. The as‐prepared composite exhibits excellent electrochemical stability of > 3.6 mAh cm −2 , with mitigated electrode expansion. Furthermore, full‐cell evaluation shows that the composite achieves higher energy density (932 Wh L −1 ) and higher specific energy (333 Wh kg −1 ) with stable cycling than has been reported in previous studies.
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