Persistent State-of-Charge Heterogeneity in Relaxed, Partially Charged Li1-xNi1/3Co1/3Mn1/3O2 Secondary Particles

被引：145

作者：

Gent, William E. ^{[1
]}

Li, Yiyang ^{[2
]}

Ahn, Sungjin ^{[3
]}

Lim, Jongwoo ^{[2
]}

Liu, Yijin ^{[4
]}

Wise, Anna M. ^{[4
]}

Gopal, Chirranjeevi Balaji ^{[2
]}

Mueller, David N. ^{[2
,5
]}

Davis, Ryan ^{[4
]}

Weker, Johanna Nelson ^{[4
]}

Park, Jin-Hwan ^{[3
]}

Doo, Seok-Kwang ^{[3
]}

Chueh, William C. ^{[2
]}

机构：

[1] Stanford Univ, Dept Chem, 333 Campus Dr, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Mat Sci & Engn, 496 Lomita Mall, Stanford, CA 94305 USA

[3] Samsung Adv Inst Technol, Energy Lab, 130 Samsung Ro, Suwon 16678, Gyeonggi Do, South Korea

[4] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, 2757 Sand Hill Rd, Menlo Pk, CA 94025 USA

[5] Forschungszentrum Julich, Elect Properties Peter Grunberg Inst, D-52425 Julich, Germany

来源：

ADVANCED MATERIALS | 2016年 / 28卷 / 31期

基金：

美国国家科学基金会;

关键词：

X-RAY-ABSORPTION; LITHIUM-ION BATTERIES; HIGH-ENERGY CATHODE; ELECTRON-MICROSCOPY OBSERVATION; INTERCALATION-INDUCED STRESS; IN-SITU MEASUREMENTS; ELECTROCHEMICAL-BEHAVIOR; HIGH-VOLTAGE; THERMOCHEMICAL EQUILIBRIUM; LIALYNI1-X-YCOXO2; CATHODE;

D O I：

10.1002/adma.201601273

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ex situ transmission X-ray microscopy reveals micrometer-scale state-of-charge heterogeneity in solid-solution Li1-xNi1/3Co1/3Mn1/3O2 secondary particles even after extensive relaxation. The heterogeneity generates overcharged domains at the cutoff voltage, which may accelerate capacity fading and increase impedance with extended cycling. It is proposed that optimized secondary structures can minimize the state-of-charge heterogeneity by mitigating the buildup of nonuniform internal stresses associated with volume changes during charge.

引用

页码：6631 / +

页数：9

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