Affiliation:
1. Beijing Key Laboratory of Environmental Science and Engineering School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 China
2. Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120 China
3. Center for Transformative Science ShanghaiTech University Shanghai 201210 China
4. Minmetals Exploration & Development CO. LTD Beijing 100010 China
Abstract
AbstractHigh‐capacity silicon has been regarded as one of the most promising anodes for high‐energy lithium‐ion batteries. However, it suffers from severe volume expansion, particle pulverization, and repeated solid electrolyte interphase (SEI) growth, which leads to rapid electrochemical failure, while the particle size also plays key role here and its effects remain elusive. In this paper, through multiple‐physical, chemical, and synchrotron‐based characterizations, the evolutions of the composition, structure, morphology, and surface chemistry of silicon anodes with the particle size ranging from 50 to 5 µm upon cycling are benchmarked, which greatly link to their electrochemical failure discrepancies. It is found that the nano‐ and micro‐silicon anodes undergo similar crystal to amorphous phase transition, but quite different composition transition upon de‐/lithiation; at the same time, the nano‐ and 1 µm‐silicon samples present obviously different mechanochemical behaviors from the 5 µm‐silicon sample, such as electrode crack, particle pulverization/crack as well as volume expansion; in addition, the micro‐silicon samples possess much thinner SEI layer than the nano‐silicon samples upon cycling, and also differences in SEI compositions. It is hoped this comprehensive study and understanding should offer critical insights into the exclusive and customized modification strategies to diverse silicon anodes ranging from nano to microscale.
Funder
Beijing Nova Program
National Natural Science Foundation of China
Beijing Institute of Technology Research Fund Program for Young Scholars
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
4 articles.
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