摘要
累托石是由二八面体的云母层与蒙托石层交替堆叠而成(1:1)的规则间层黏土矿物,是我国特有的矿种。目前的累托石开发中存在产品价廉、附加值低等问题,如应用于建筑材料等。与此同时,锂电池工业的快速发展亟需开发高容量的硅基负极材料。本文利用累托石特殊的层状结构和Si-Al交替分布的特征,采用镁热技术实现了从累托石到片状多孔硅的转化。通过碳包覆制备的硅碳复合材料可逆容量可达1300 m Ah·g^(–1),同时具有良好的循环稳定性和倍率特性。证实利用累托石制备高性能硅基锂电池负极材料是可行的,为累托石的高值化综合利用提供候选途径。
Rectorite clay is a sort of regularly interstratified clay mineral with alternate pairs of dioctahedralmica-like layer and dioctahdral smectite-like layer existing in 1：1 ratio, which is one of unique minerals of China. Theapplications are limited to several low value ways, such as building materials. At the same time, it is urgency to develophigh-capacity Si-based anode material with the rapid development of lithium battery industry. Thanks to its uniquelayered structure and the Si-Al alternated dispersion of rectorite, the transformation from rectorite to porous Si nanoplateswas realized via magnesiothermic reduction process. After carbon coating, porous Si/C nanoplates with the reversiblecapacity of 1300 mAh·g–1, good cycle stability and rate performance can be obtained. This process would provide acandidate way for the comprehensive utilization of rectorite.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2018年第1期40-44,共5页
Electronic Components And Materials
基金
湖北省地质局科技项目资助(KJ2017-27)
国家重点基础研究发展计划资助(973计划,2014CB239702)
国家自然科学基金资助项目(21501120)
关键词
累托石
硅碳复合物
负极材料
镁热还原
锂电池
负极
rectorite
Si/C composite
anode materials
magnesiothermic reduction
lithium battery
anode
