Three-dimensional evaluation of compositional and structural changes in cycled LiNi1/3Co1/3Mn1/3O2 by atom probe tomography

被引：24

作者：

Lee, Ji Yeong ^{[1
]}

Kim, Ji Yoon ^{[2
]}

Cho, Hae In ^{[3
]}

Lee, Chi Ho ^{[4
,5
]}

Kim, Han Sung ^{[1
]}

Lee, Sang Uck ^{[4
,5
]}

Prosa, Ty J. ^{[6
]}

Larson, David J. ^{[6
]}

Yu, Tae Hwan ^{[3
]}

Ahn, Jae-Pyoung ^{[1
]}

机构：

[1] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 130650, South Korea

[2] Samsung SDI, R&D Ctr, 130 Scunsungro Ro, Suwon 16678, Gyeonggi Do, South Korea

[3] Samsung SDI, 150-20 Gongse Ro, Suwon 17084, Gyeonggi Do, South Korea

[4] Hanyang Univ, Dept Bionano Technol, Ansan 15588, South Korea

[5] Hanyang Univ, Dept Chem & Mol Engn, Ansan 15588, South Korea

[6] CAMECA Instruments Inc, Madison, WI 53711 USA

来源：

JOURNAL OF POWER SOURCES | 2018年 / 379卷

关键词：

LITHIUM-ION BATTERIES; AUGMENTED-WAVE METHOD; SPECIMEN PREPARATION; ELECTRON-MICROSCOPY; CATHODE MATERIALS; NICKEL-OXIDE; TRANSITION; SPECTROSCOPY; PARTICLES; CELLS;

D O I：

10.1016/j.jpowsour.2018.01.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Accelerated capacity fading of LiNi1/3Co1/3Mn1/3O2 (NCM111) electrode by the chemical migration of lithium (Li) or transition metals (TMs), and surface reconstruction in the surface during electrochemical cycling were evaluated by correlative analysis of atom probe tomography (APT) and transmission electron microscopy (TEM). The cycled NCM111 showed a lack of Li at surface which provides the driving force for long-range Ni migration toward surface. A schematic model for phase transformation and the kinetics of TM migration within the layered structure by density functional theory (DFT) calculations was proposed. This study provides insights into capacity loss and voltage fade upon electrochemical charge-discharge process of NCM111 by measuring the variation of Li composition away from the surface.

引用

页码：160 / 166

页数：7

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