Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance

被引：113

作者：

Kondo, H. ^{[1
]}

Takeuchi, Y. ^{[1
]}

Sasaki, T. ^{[1
]}

Kawauchi, S. ^{[1
]}

Itou, Y. ^{[1
]}

Hiruta, O. ^{[1
]}

Okuda, C. ^{[1
]}

Yonemura, M. ^{[2
]}

Kamiyama, T. ^{[3
]}

Ukyo, Y. ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan

[2] Ibaraki Univ, Grad Sch Sci & Engn, Inst Appl Beam Sci, Ibaraki 3158511, Japan

[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

来源：

JOURNAL OF POWER SOURCES | 2007年 / 174卷 / 02期

关键词：

lithium-ion battery; neutron diffraction; cycle performance; electrochemical impedance spectroscopy;

D O I：

10.1016/j.jpowsour.2007.06.035

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：

Mg-substituted Li(Ni,Co,Al)O-2 have been prepared by a co-precipitation method and examined by XRD, neutron diffraction, X-ray absorption, magnetization and electrochemical measurements. Neutron diffraction measurement indicated that the Mg ions were mostly substituted for Ni ions located in transition metal layers in LiNi0.75Co0.15Al0.05Mg0.05O2. Although a tiny amount of Ni ions in lithium layers in LiNi0.8Co0.15Al0.05O2 was detected by magnetization measurements, such Ni ions decreased by Mg-substitution. The Mg-substitution for Ni in LiNi0.75Co0.15Al0.05Mg0.05O2 was also confirmed by X-ray absorption measurements. The 500 mAh-type cylindrical lithium-ion cells of LiNi0.8-xCo0.15Al0.05MgxO2 (x= 0, 0.05) with graphite negative-electrode were prepared and their battery performances were evaluated by cycling test at 2 C charge/discharge rate at 60 degrees C. A lithium-ion cell of LiNi0.75Co0.15Al0.05Mg0.05O2 exhibited better capacity retention and smaller battery resistance than that of LiNi0.8Co0.15Al0.05O2 after 500 cycles. Electrochemical impedance spectroscopy revealed that the Mg-substitution suppressed the increase in charge-transfer resistance upon cycling. The effects of Mg-substitution in LiNi0.8Co0.15Al0.05O2 were discussed in terms of crystal structure and battery performance. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：1131 / 1136

页数：6

共 18 条

[1] Review of selected electrode-solution interactions which determine the performance of Li and Li ion batteries [J].