Electrochemical Splitting of LiF: A New Approach to Lithium-ion Battery Materials

被引：22

作者：

Dimov, N. ^{[1
]}

Kitajou, A. ^{[2
]}

Hori, H. ^{[1
]}

Kobayashi, E. ^{[2
]}

Okada, S. ^{[1
]}

机构：

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

[2] Kyoto Univ, Elements Strategy Initiat Catalysis & Batteries, Katsura, Kyoto 6158530, Japan

来源：

BATTERY CHEMISTRIES BEYOND LITHIUM ION | 2014年 / 58卷 / 12期

关键词：

METAL FLUORIDE NANOCOMPOSITES; CONVERSION REACTION; INTERCALATION; ELECTRODE; LI3FEF6;

D O I：

10.1149/05812.0087ecst

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Composites of LiF and lithium-free manganese compounds (MnF2 and MnOx) were prepared by high-energy ball milling and their electrochemical activities as cathode were investigated. Within the voltage range of 1.5 -4.8 V, MnOx/LiF composites exhibited reversible reactivity with a sloping voltage profile, while MnF2/LiF composites showed no reactivity. Reversible Li+ extraction from the MnOx/LiF composites was observed in a full cell configuration with graphite anode, where total Li+ balance was monitored by chemical analysis of the anode and the cathode. Exsitu X-ray diffraction and X-ray absorption fine structure (XAFS) experiments further confirmed that during the first charge LiF is split electrochemically and the Mn oxidation state changes accordingly, but the MnOx/LiF remained amorphous. Composites containing the redox oxide and the lithium compound as two separate solid phases could be used as a source of Li+ and it offers a new type of cathode materials for lithium-ion batteries.

引用

页码：87 / 99

页数：13

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