Cathodic performance of LiMn1-xMxPO4 (M = Ti, Mg and Zr) annealed in an inert atmosphere

被引：165

作者：

Shiratsuchi, Tomoyuki ^{[1
]}

Okada, Shigeto ^{[1
]}

Doi, Takayuki ^{[1
]}

Yamaki, Jun-ichi ^{[1
]}

机构：

[1] Kyushu Univ, Inst Mat Chem & Engn, Kasuga, Fukuoka 8168580, Japan

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 11期

关键词：

Olivine; LiMnPO4; Mn2P; Carbothermal treatment; Cation doping; ELECTRODE MATERIALS; LITHIUM BATTERIES; PHOSPHO-OLIVINES; LIFEPO4; CAPACITY; LIMNPO4; LIMPO4; ROOM; FE;

D O I：

10.1016/j.electacta.2008.11.069

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

To improve the cathodic performance of olivine-type LiMnPO4, we investigated the optimal annealing conditions for a composite of carbon with cation doping. Nanocrystalline and the cation-doped LiMn1-xMxPO4 (M-Ti, Mg, Zr and x = 0, 0.01, 0.05 and 0.10) was synthesized in aqueous solution using a planetary ball mill. The synthesis was performed at the fairly low temperature of 350 degrees C to limit particle size. The obtained samples except for the Zr doped one consisted of uniform and nano-sized particles. The performance of LiMnPO4 was much improved by an annealing treatment between 500 and 550 degrees C with carbon in an inert atmosphere. A small amount of metal-rich phosphide (Mn2P) was detected in the sample annealed at 900 degrees C. In addition, 1 at.% Mg doping for Fe enhanced the rate capability in our doped samples. The discharge capacity of LiMn0.99Mg0.01 PO4/C was 146 mAh/g at 0.1 mA/cm(2) and 125 mAh/g even at 2.0 mA/cm(2). (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3145 / 3151

页数：7

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