Vanadium diphosphides as negative electrodes for secondary Li-ion batteries

被引：56

作者：

Gillot, F.

Menetrier, M.

Bekaert, E.

Dupont, L.

Morcrette, M.

Monconduit, L. ^{[1
]}

Tarascon, J. M.

机构：

[1] Univ Montpellier 2, LAMMI UMR 5072, F-34095 Montpellier, France

[2] Univ Picardie, LRCS UMR 6007, F-80039 Amiens, France

[3] ICMCB ICMCM CNRS, F-33608 Pessac, France

来源：

JOURNAL OF POWER SOURCES | 2007年 / 172卷 / 02期

关键词：

lithium ion batteries; vanadium diphosphides; ball-milling; capacity retention;

D O I：

10.1016/j.jpowsour.2007.05.043

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：

We report on the Li electrochemical reactivity of amorphous and crystalline VP2, synthesized by ball-milling and by 600 degrees C heat treatment of a ball-milled sample, respectively. The amorphous sample can reversibly react with 3.5 Li per formula unit as compared to solely 2.5 for the crystalline one. However in both cases there is a rapid capacity decay upon cycling that is more pronounced in the case of the crystalline sample. Complementary X-rays, HTREM and NMR tend to show that the Li reactivity mechanism differs from the classical conversion reactions since neither V nanoparticles northe formation of Li3P were detected, as opposed to some of the other MP2 compounds (M=NiorCu). Besides structural phase variations within the 3d metal-based binary phosphide series, the possibility of a change in the nature of the redox centre upon lithiation from cation (M) to anion (P) is evoked. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：877 / 885

页数：9