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Citation: Wang Zhi-Xing, Xing Zhi-Jun, Li Xin-Hai, Guo Hua-Jun, Peng Wen-Jie. Study on Al₂O₃-modified LiMn2O4 Prepared by Heterogeneous Nucleation[J]. Acta Physico-Chimica Sinica, ;2004, 20(08): 790-794. doi: 10.3866/PKU.WHXB20040802 shu

Study on Al₂O₃-modified LiMn2O4 Prepared by Heterogeneous Nucleation

1.
Institute of Metallurgical Physico-Chemistry and Materials, School of Metallurgical Science and Engineering, Central South University, Changsha　410083

Received Date: 9 February 2004
Available Online: 15 August 2004

The spinel LiMn2O4 synthesized by the method of solid-state reaction was modified with aluminum oxide through the heterogeneous nucleation process. The pristine and surface-modified spinel LiMn2O4 were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM) and particle size analysis. Effects of the surface-modification and preparation conditions on the cycleability and the rate capability were studied. The initial capacity of unmodified LiMn2O4 was 86.5 mA•h•g－1 and the capacity fade was 26.3％ after 50 cycles. The initial capacities of LiMn2O4 modified with 0.5％ and 1％(w) aluminum oxide were 96.0 mA•h•g－1 and 80.1 mA•h•g－1, and the capacity fades were 7.0％ and 5.6％, respectively. The results showed that the cycling life of LiMn2O4 was clearly improved by modification of aluminum oxide through the process of heterogeneous nucleation. With the increase of aluminum oxide, the cycling life increases, however, the capacity obviously decreases. The process of heterogeneous nucleation showed some special characters, such as the homogeneous coating. It is more suitable for the surface-modification of LiMn2O4.
- Lithium ion battery;Spinel;Lithium manganese oxide;Surface modification;Heterogeneous nucleation
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沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

Study on Al₂O₃-modified LiMn2O4 Prepared by Heterogeneous Nucleation