Clean Solid-Electrolyte/Electrode Interfaces Double the Capacity of Solid-State Lithium Batteries

被引：9

作者：

Kawasoko, Hideyuki ^{[4
]}

Shirasawa, Tetsuroh ^{[5
]}

Nishio, Kazunori ^{[1
]}

Shimizu, Ryota ^{[1
,2
]}

Shiraki, Susumu ^{[3
]}

Hitosugi, Taro ^{[1
]}

机构：

[1] Tokyo Inst Technol, Sch Mat & Chem Technol, Tokyo 1528550, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[3] Nippon Inst Technol, Dept Appl Chem, Saitama 3458501, Japan

[4] Tohoku Univ, Grad Sch Sci, Dept Chem, Sendai, Miyagi 9808577, Japan

[5] Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058565, Japan

来源：

ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 04期

关键词：

solid-state Li batteries; LiNi0.5Mn1.5O4; electrolyte/electrode interface; epitaxial thin film; large battery capacity; spontaneous Li migration;

D O I：

10.1021/acsami.0c21586

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Solid-state lithium (Li) batteries using spinel-oxide electrode materials such as LiNi0.5Mn1.5O4 are promising power supplies for mobile devices and electric vehicles. Here, we demonstrate stable battery cycling between the Li0Ni0.5Mn1.5O4 and Li2Ni0.5Mn1.5O4 phases with working voltages of approximately 2.9 and 4.7 V versus Li/Li+ in solid-state Li batteries with contamination-free clean Li3PO4/LiNi0.5Mn1.5O4 interfaces. This clean interface has the effect of doubling the capacity of conventional battery cycling between the Li0Ni0.5Mn1.5O4 and Li1Ni0.5Mn1.5O4 phases. We also investigated the structural changes between the Li2Ni0.5Mn1.5O4 and Li2Ni0.5Mn1.5O4 phases during battery cycling. Furthermore, we found an inhomogeneous distribution of the Li2Ni0.5Mn1.5O4 phase in the LiNi0.5Mn1.5O4 electrode, induced by spontaneous Li migration after the formation of the Li3PO4/LiNi0.5Mn1.5O4 interface. These results indicate that the formation of a contamination-free clean Li3PO4/LiNi0.5Mn1.5O4 interface is key to increase the battery capacity.

引用

页码：5861 / 5865

页数：5

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