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Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12
Yanwei Huang; Yu He; Howard Sheng; Xia Lu; Haini Dong; Sudeshna Samanta; Hongliang Dong; Xifeng Li; Duck Young Kim; Ho-kwang Mao; Yuzi Liu; Heping Li; Hong Li; Lin Wang
2019
发表期刊National Science Review
卷号6期号:2页码:239-246
摘要

Lithium titanium oxide (Li4Ti5O12, LTO), a ‘zero-strain’ anode material for lithium-ion batteries, exhibits excellent cycling performance. However, its poor conductivity highly limits its applications. Here, the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations. LTO underwent a pressure-induced amorphization (PIA) at 26.9 GPa. The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase. Furthermore, our calculations demonstrated that the different compressibility of the LiO6 and TiO6 octahedra in the structure was crucial for the PIA. The amorphous phase promotes Li+ diffusion and enhances its ionic conductivity by providing defects for ion migration. Our results not only provide an insight into the pressure depended structural properties of a spinel-like material, but also facilitate exploration of the interplay between PIA and conductivity.

关键词High Pressure Pressure-induced Amorphization Lithium-ion Battery Materials Ionic Conductivity
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10240
专题地球内部物质高温高压实验室
地球深部物质与流体作用地球化学研究室
作者单位1.Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China
2.Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Guizhou, Peoples R China
3.George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA
4.Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Zhejiang, Peoples R China
5.Beijing Univ Chem Engn, Coll Energy, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
6.Shanghai Univ, Sch Mechatron Engn & Automat, Shanghai 200072, Peoples R China
7.Carnegie Inst, Geophys Lab, Washington, DC 20015 USA
8.Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA
9.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714
Yanwei Huang,Yu He,Howard Sheng,et al. Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12[J]. National Science Review,2019,6(2):239-246.
APA Yanwei Huang.,Yu He.,Howard Sheng.,Xia Lu.,Haini Dong.,...&Lin Wang.(2019).Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12.National Science Review,6(2),239-246.
MLA Yanwei Huang,et al."Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12".National Science Review 6.2(2019):239-246.
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