Enhancement of discharge capacity of Li3V2(PO4)3 by stabilizing the orthorhombic phase at room temperature

被引：137

作者：

Sato, M ^{[1
]}

Ohkawa, H ^{[1
]}

Yoshida, K ^{[1
]}

Saito, M ^{[1
]}

Uematsu, K ^{[1
]}

Toda, K ^{[1
]}

机构：

[1] Niigata Univ, Fac Engn, Dept Chem & Chem Engn, Niigata 9502181, Japan

来源：

SOLID STATE IONICS | 2000年 / 135卷 / 1-4期

基金：

日本学术振兴会;

关键词：

cathode material; lithium ion battery; phase transition; Rietveld analysis; neutron diffraction;

D O I：

10.1016/S0167-2738(00)00292-7

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：

Li3V2(PO4)(3) and solid solutions of Li3-2x(V1-x,Zr-x)(2)(PO4)(3) were prepared by a solid state reaction. A high temperature orthorhombic phase of Li3V2(PO4)(3) with a beta -Fe-2(SO4)(3)-type was successfully stabilized at room temperature by substituting Zr for V with substitution ratios beyond x = 0.05. The pure material of Li3V2(PO4)(3) exhibited a cathode performance with two well defined regions of plateau at around 3.7 and 4.1 V vs. Li/Li+ upon charging and 3.6 and 4.0 V vs. Li/Li+ upon discharging, respectively, suggesting two types of phases produced upon the charge/discharge process. On the other hand, the cathode performance of the orthorhombic stabilized materials showed almost the same charge/discharge voltages as those of the pure material, but, with two plateaus slightly sloping, showed a considerably improved charge/discharge cycle performance compared to that of the purl material. Such improvement on the charge/discharge cycle performance is suggested to come from the disordered lithium ion arrangement in the orthorhombic phase. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：137 / 142

页数：6

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