摘要
硅基材料是具备良好应用前景的锂离子电池负极材料。然而,硅基负极材料也面临机械稳定性和电化学稳定性差等问题,限制了其作为锂离子电池材料的实际应用。非晶态纳米硅粉通过将硅颗粒纳米化与非晶化,可显著改善机械稳定性和电化学稳定性,其有效的制备方法对于改善锂离子电池的各项性能具有重要意义。非晶态纳米硅粉的制备有以下几种方法:用还原性强的金属或非金属还原硅氧化物或卤化物;将原料硅液化或汽化后快速冷凝;通过热分解气相反应制备。本文对非晶态纳米硅粉的制备方法进行综述,包括机械球磨法、化学还原法、溶剂热法、液相急冷法以及气相沉积法等。并围绕经济性、工业化生产可行性等方面介绍了各种制备方法的优缺点。本文同时介绍了等离子蒸发冷凝法、喷雾造粒技术、自蔓延燃烧法、改良西门子法、电沉积法等其他具有可能性的制备方法,以期为非晶态纳米硅粉的制备提供更多参考。
Silicon-based materials are promising anode materials for the application of lithiumion batteries.However,silicon-based anode materials also have problems such as mechanical and electrochemical instability,which limits their practical application as anode material for lithium-ion batteries.In amorphous nanostructured silicon powder,the mechanical and electrochemical instability can be effectively alleviated by reducing the particle size to nanoscale and translating the structure from crystalline to amorphous.Thus,the effective preparation of amorphous nanosilicon powder is of great significance for improving the performance of lithium-ion batteries.The preparation of amorphous nanostructured silicon powder is based on the following principles:reduction of silicon oxides or halides by adding metals or nonmetals with a strong reductant,quick freezing of liquid or gaseous silicon,and thermal decomposition of gaseous silicon.The preparations of amorphous nanosilicon powder are reviewed,including mechanical ball milling,chemical reduction,solvent heating,liquid phase quenching,and vapor deposition.The advantages and disadvantages of various preparation methods are introduced considering their economics,feasibility of industrial production,and so on.In addition,other possible methods such as plasma evaporationcondensation,spray drying,self-propagating combustion,improved Siemens method,and electrodeposition technology are described to offer more references for the preparation of amorphous nanosilicon powder.
作者
王腾辉
陈果
杨学林
WANG Tenghui;CHEN Guo;YANG Xuelin(College of Electrical Engineering&New Energy,Chinese Three Gorges University,Yichang 443002,Hubei,China;College of Materials and Chemical Engineering,Chinese Three Gorges University,Yichang 443002,Hubei,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2021年第2期440-447,共8页
Energy Storage Science and Technology
基金
国家重点研发计划子课题(2018YFB0905400)
国家自然科学基金项目(51772169)
湖北省技术创新重大专项(2019AAA164)。
关键词
非晶态
纳米硅粉
锂离子电池
负极材料
制备方法
amorphous
nanostructured silicon powder
lithium-ion battery
anode materials
preparation methods
