Charge compensation mechanisms in Li1.16Ni0.15Co0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure

被引：123

作者：

Oishi, Masatsugu ^{[1
]}

Fujimoto, Takahiro ^{[1
]}

Takanashi, Yu ^{[1
]}

Orikasa, Yuki ^{[2
]}

Kawamura, Atsushi ^{[2
]}

Ina, Toshiaki ^{[2
]}

Yamashige, Hisao ^{[1
]}

Takamatsu, Daiko ^{[1
]}

Sato, Kenji ^{[1
]}

Murayama, Haruno ^{[1
]}

Tanida, Hajime ^{[1
]}

Arai, Hajime ^{[1
]}

Ishii, Hideshi ^{[3
]}

Yogi, Chihiro ^{[3
]}

Watanabe, Iwao ^{[3
]}

Ohta, Toshiaki ^{[3
]}

Mineshige, Atsushi ^{[4
]}

Uchimoto, Yoshiharu ^{[2
]}

Ogumi, Zempachi ^{[1
]}

机构：

[1] Kyoto Univ, Off Soc Acad Collaborat Innovat, Kyoto 6110011, Japan

[2] Kyoto Univ, Grad Sch Human & Environm Studies, Sakyo Ku, Kyoto 6068501, Japan

[3] Ritsumeikan Univ, SR Ctr, Kusatsu, Shiga 5258577, Japan

[4] Univ Hyogo, Grad Sch Engn, Himeji, Hyogo 6712280, Japan

来源：

JOURNAL OF POWER SOURCES | 2013年 / 222卷

关键词：

Li2MnO3; Lithium ion battery; In situ XAS; Positive material; CATHODE; SPECTROSCOPY; LI2MNO3; INTERCALATION; DIFFRACTION; SYSTEM; OXIDES; XANES;

D O I：

10.1016/j.jpowsour.2012.08.023

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：

The redox reaction of Li1.16Ni0.15Co0.19Mn0.50O2 positive electrode material during the charging and discharging processes was investigated by using spectroscopic methods, i.e. in situ hard X-ray absorption near edge structure (XANES) at transition metal K-edges and ex situ soft XANES at oxygen K- and transition metal L-edges. The spectral changes of constituent elements during the initial charging to 4.5 V vs. Li/Li+ are quite similar to those of conventional layer-structured positive materials, such as LiNi1/3Mn1/3Co1/3O2 center dot Ni2+ and Co3+ ions are fully oxidized to Ni4+ and Co4+, while Mn4+ remains unchanged. Ligand oxygen ions also take part in charge compensation. In the process of charging to 4.8 V via the plateau voltage region, no significant spectral change appears except partial reduction of Ni and Co ions in spite of lithium extraction. By discharging to 2.0 V the spectra of each element return to those of the pristine material. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：45 / 51

页数：7

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