Investigation on porous MnO microsphere anode for lithium ion batteries

被引：219

作者：

Zhong, Kaifu ^{[1
]}

Zhang, Bin ^{[1
]}

Luo, Shihai ^{[2
]}

Wen, Wen ^{[2
]}

Li, Hong ^{[1
]}

Huang, Xuejie ^{[1
]}

Chen, Liquan ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Shanghai Synchrotron Radiat Facil, Pudong New Area, Shanghai 201204, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 16期

关键词：

Manganese monoxide; Li-ion batteries; X-ray absorption near edge structure; Extended X-ray absorption fine structure; Thermodynamics; Kinetics; X-RAY-ABSORPTION; REACTIVITY MECHANISM; ELECTRODE MATERIALS; METAL FLUORIDES; HIGH-CAPACITY; LI-STORAGE; SPECTROSCOPY; OXIDES; ELECTROCHEMISTRY; NANOCOMPOSITES;

D O I：

10.1016/j.jpowsour.2010.10.031

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：

MnO microspheres with and without carbon coating are prepared as anode materials for lithium ion batteries. The MnO microsphere material shows a reversible capacity of 800 mAh g(-1) and an initial efficiency of 71%. It can deliver 600 mAh g(-1) at a rate of 400 mA g(-1). Results of Mn K-edge X-ray absorption near-edge structure (XANES) spectra and extended X-ray absorption fine structure (EXAFS) confirm further the conversion reaction mechanism, indicate that pristine MnO is reduced to Mn after discharging to 0 V and part of reduced Mn(0) is not oxidized to Mn(2+) after charging to 3 V. This explains the origin of the initial irreversible capacity loss partially. The quasi open circuit voltage and the relationship between the current density and the overpotential are investigated. Both indicate that there is a significant voltage difference between the charging and discharging profiles even when the current density decreases to zero. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：6802 / 6808

页数：7

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