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余创

教授    博士生导师    硕士生导师

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  • 教师英文名称: Chuang Yu
  • 性别: 男
  • 在职信息: 在职
  • 所在单位: 电气与电子工程学院
  • 学历: 研究生(博士)毕业
  • 学位: 工学博士学位

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Synthetic optimization and application of Li-argyrodite Li6PS5I in solid-state battery at different temperatures

发布时间:2022-02-08
点击次数:
论文类型:
期刊论文
发表刊物:
RARE METALS
收录刊物:
SCI
所属单位:
School of Electrical and Electronic Engineering, Huazhong University of Science and Technology
学科门类:
工学
一级学科:
材料科学与工程
文献类型:
J
卷号:
41
期号:
3
页面范围:
798-805
DOI码:
10.1007/s12598-021-01827-9
发表时间:
2021-09-23
影响因子:
4.003
摘要:
Lithium argyrodite electrolytes (Li6PS5X (X=Cl, Br, I)) have received tremendous attention due to their low cost and high conductivity among sulfide electrolytes. However, the synthesis details and application of Li6PS5I in solid-state batteries have not been fully investigated yet. Here, we unravel the synthetic process for the Li6PS5I phase with the mechanical milling route, in which the argyrodite phase appears after 500 r·min-1 for 12 h. The pure Li6PS5I phase with the highest ionic conductivity (2.1  10-4 S·cm-1) is obtained after 20-h milling, and a subsequent annealing process causes a decrease of the conductivity. The Li6PS5I is applied with both the pristine and LiNbO3-coated LiNi0.7Mn0.2Co0.1O2 cathodes in solid-state batteries. The coated LiNi0.7Mn0.2Co0.1O2 material delivers higher discharge capacities (211.4 vs. 140.7 mAh·g-1 at0.05 C for the 1st cycle, and 144.0 vs. 66.5 mAh·g-1 at 0.5C for the 2nd cycle) and higher coulombic efficiencies. Moreover, the coated LiNi0.7Mn0.2Co0.1O2 electrode exhibits potential operation at -20 oC. In-situ/ex-situ EIS are applied to unravel the resistance evaluation of SSBs at different temperatures, which show that the low electrolyte conductivity and the slow lithium-ion mobility across the interface are the major bottlenecks for good electrochemical performance.