Regulating charge/ion transfer kinetic behavior via embedded TiOX in hierarchical TiOX/SiOX@C with optimal expansion stress for lithium storage

被引：9

作者：

Ge, Jiawei ^{[1
]}

Guo, Tao

Shen, Honglie ^{[1
,2
,5
]}

Zhou, Fei ^{[3
]}

Li, Yufang ^{[1
]}

Yuan, Ningyi ^{[2
]}

Yang, Wangyang ^{[1
]}

Wang, Zehui ^{[1
]}

Xu, Yajun ^{[1
]}

Zhang, Jinzhe ^{[1
]}

Wu, Yimin A. ^{[4
,5
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Jiangsu Key Lab Mat & Technol Energy Convers, Nanjing 210016, Peoples R China

[2] Changzhou Univ, Jiangsu Collaborat Innovat Ctr Photovolta Sci & En, Changzhou 213164, Peoples R China

[3] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, Nanjing 210016, Peoples R China

[4] Univ Waterloo, Waterloo Inst Nanotechnol, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada

[5] 29 Jiangjun Ave, Nanjing 211100, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2023年 / 555卷

基金：

中国国家自然科学基金;

关键词：

Charge; ion transfer; Structural stability; TiOX; OptimalTiOX; SiOX@C; ANODE MATERIAL; COMPOSITE; BATTERY; SI;

D O I：

10.1016/j.jpowsour.2022.232357

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The charge/ion transfer and structural stability of silicon suboxide (SiOX) for lithium-ion batteries (LIBs) are plaguing. Titanate oxide (TiO2) shows zero strain and high ion diffusion for lithiation, promising for improving its electrochemical properties. Herein, hybrid TiOX/SiOX@C (local reduction of TiO2 for TiOX) was prepared via magnesiothermic reaction and self-assembled as hierarchical microspheres. The embedded TiOX and hierarchical structures buffer the volume-expansion-induced strain of TiOX/SiOX@C for high structural integrity. Oxygenvacancy sites around Ti and Si atoms for charge transfer tunnel and the heterostructure for fast interfacial charge response improve its electronic conductivity. The introduction of locally reduced Ti atoms alters oxygen structural dispersion, further reducing Li diffusion barriers. Even, the inevitable crack of TiOX/SiOX induces its exposure to the electrolyte, facilitating a compact solid electrolyte interphase layer for stable electrochemical performance. Thus, its open-circuit voltage curve displays a low lithiation platform due to its low polarization for Si-based anodes. These synergetic findings deliver the optimal TiOX/SiOX@C with high cycling stability (951.6

引用

页数：12