Synthesis of passively prelithiated SiOx nanoparticles for Li-ion battery anode

被引:7
作者
Kim, Nakwon [1 ,2 ]
Lee, Wooyoung [1 ,2 ]
Kim, Joonsoo [1 ]
Kim, Daeil [1 ]
Jang, Boyun [1 ]
机构
[1] Korea Inst Energy Res, Energy Storage Lab, 152 Gajeong Ro, Daejeon, South Korea
[2] Korea Univ, Dept Mat Sci & Engn, Seoul, South Korea
关键词
Li-ion battery; nanostructure; passive prelithiation; SiOx; SILICON ANODES; LITHIUM; PERFORMANCE; CAPACITY; SIZE;
D O I
10.1111/jace.19102
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A new concept of passive prelithiation to SiOx nanoparticles is introduced and evaluated by investigating their nanostructures and electrochemical properties. Specifically, Li is incorporated into SiOx nanoparticles during the nanoparticle synthesis. We obtain Si-Li-O-based nanoparticles, which we call SILIO; these are much larger than SiOx particles and have totally different nanostructures. Due to nanostructures with various phase distributions, SILIO nanoparticles show enhanced electrochemical properties. The initial reversible capacity (IRC) and initial columbic efficiency (ICE) of SILIO nanoparticles are 946 to 1107 mAh/g and 72% to 77%, respectively, while SiOx exhibits 1,064 mAh/g of IRC only with 41.5% of ICE. In addition, the stability of SILIO in the air is evaluated to guarantee no unstable phases such as Li2Ox (x = 0-2) are present in SILIO. Through our findings, we suggest a new nanostructure model composed of crystalline Si, amorphous SiOx, and lithium silicate.
引用
收藏
页码:4554 / 4566
页数:13
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