Structural and electrochemical properties of the doped spinels Li1.05M0.02Mn1.98O3.98N0.02 (M = Ga3+, Al3+, or Co3+; N = S2- or F-) for use as cathode material in lithium batteries

被引：48

作者：

Amaral, Fabio A. ^{[1
]}

Bocchi, Nerilso ^{[1
]}

Brocenschi, Ricardo F. ^{[1
]}

Biaggio, Sonia R. ^{[1
]}

Rocha-Filho, Romeu C. ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP, Brazil

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 10期

基金：

巴西圣保罗研究基金会;

关键词：

Doped-manganese spinels; Cationic and anionic doping; Mechanical milling; Lithium-ion battery; Cathode material; MECHANOCHEMICAL SYNTHESIS; MANGANESE-DIOXIDE; CYCLING BEHAVIOR; ION BATTERIES; LIMN2O4; LI; PERFORMANCE; OXIDE; CAPACITY; DEGRADATION;

D O I：

10.1016/j.jpowsour.2009.12.002

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：

The doped and milled spinels Li1.05M0.02Mn1.98O3.98N0.02 (M = Ga3+, Al3+ or Co3+; N = S2- or F-) are studied aiming at obtaining an improved charge/discharge cycling performance. These spinels are prepared by a solid-state reaction among the precursors epsilon-MnO2, LiOH, and the respective oxide/salt of the doping ions at 750 degrees C for 72 h and milled for 30 min. The obtained spinels are characterized by XRD, SEM, and determinations of the average manganese valence n. In the charge and discharge tests, the doped spinels present outstanding initial values of the specific discharge capacity C(117-126 mA h g(-1)), decreasing in the following order: C(Li1.05Al0.02Mn1.98S3.02O3.98) > C(Li1.05Al0.02Mn1.98F3.02O3.98) > C(Li1.05Ga0.02Mn1.98 S3.02O3.98) > C(Li1.05Ga0.02Mn1.98F3.02O3.98) > C(Li1.05Co0.02Mn1.98S3.02O3.98) > C(Li1.05Co0.02Mn1.98F3.02O3.98). The doped spinel Li1.05Ga0.02Mn1.98S3.02O3.98 presents an excellent electrochemical performance, with a low capacity loss even after 300 charge and discharge cycles (from 120 to 115 mA hg(-1) or 4%). (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：3293 / 3299

页数：7

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