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Correlation between the physical parameters and the electrochemical performance of a silicon anode in lithium-ion batteries

查看全文 作　　者：Guobin [1]Zhu;Yan [1]Wang;Siming [1]Yang;Qunting [1]Qu;Honghe [1]Zheng 高影响力作者 机构地区：[1]College of Energy&Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou,Jiangsu,215006,PR China高影响力机构 出　　处：《Journal of Materiomics》索引2019年第5卷第2期,共12页高影响力期刊 基　　金：The authors are very grateful to the National Natural Science Foundation of China(NSFC no.21875154 and 21473120)for funding. 摘　　要：Lithium-ion battery anode used as silicon particles were obtained from different major suppliers,and they were characterized by different spectroscopic techniques and evaluated by electrochemical experiments.Correlations between the key physical parameters and electrochemical properties of the silicon particles were investigated.Silicon particle size,surface oxygen content,-OH content and physical appearance are found to strongly influence the electrochemical properties of the Si anode.The particle size of 100 nm has great promise for the practical application of Si nanoparticles in the lithium-ion battery industry.An inverse correlation between the oxygen content and the reversible capacity or first coulombic efficiency was obtained.The-OH content by surface treatment contributes to enhanced cycling stability by the improved affinity between the Si particle and the water-soluble binder.Spherical Si particles perform better compared to irregular particles,and agglomeration dramatically decreases the cycling stability of the Si anode.Among the investigated Si particles,the sample that exhibited a reversible capacity of more than 2500 mAh g^(-1),a first coulombic efficiency of 89.26%and an excellent cycling stability,has great potential for use in the battery industry. 关 键 词：Lithium ionbatteries Silicon anode Physical parameters Particle size Surface condition
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