Nanoscale Interface Modification of LiCoO2 by Al2O3 Atomic Layer Deposition for Solid-State Li Batteries

被引：186

作者：

Woo, Jae Ha ^{[1
]}

Trevey, James E. ^{[1
]}

Cavanagh, Andrew S. ^{[2
]}

Choi, Yong Seok ^{[3
]}

Kim, Seul Cham ^{[3
]}

George, Steven M. ^{[4
]}

Oh, Kyu Hwan ^{[3
]}

Lee, Se-Hee ^{[1
]}

机构：

[1] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

[4] Univ Colorado, Dept Chem & Biol Engn, Dept Chem & Biochem, Boulder, CO 80309 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 07期

关键词：

LITHIUM SECONDARY BATTERIES; ELECTROCHEMICAL PERFORMANCE; ION BATTERIES; ELECTRODE; CATHODES; STABILITY; FILMS;

D O I：

10.1149/2.085207jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cycle stability of solid-state lithium batteries (SSLBs) using a LiCoO2 cathode is improved by atomic layer deposition (ALD) on active material powder with Al2O3. SSLBs with LiCoO2/Li3.15Ge0.15P0.85S4/77.5Li(2)S-22.5P(2)S(5)/Li structure were constructed and tested by charge-discharge cycling at a current density of 45 mu A cm(-2) with a voltage window of 3.3 similar to 4.3 V (vs. Li/Li+). Capacity degradation during cycling is suppressed dramatically by employing Al2O3 ALD-coated LiCoO2 in the composite cathode. Whereas only 70% of capacity retention is achieved for uncoated LiCoO2 after 25 cycles, 90% of capacity retention is observed for LiCoO2 with ALD Al2O3 layers. Electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM) studies show that the presence of ALD Al2O3 layers on the surface of LiCoO2 reduces interfacial resistance development between LiCoO2 and solid state electrolyte (SSE) during cycling. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.085207jes] All rights reserved.

引用

页码：A1120 / A1124

页数：5

共 20 条

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