采用溶胶-凝胶包裹法对尖晶石LiMn2O4及其阳离子掺杂LiM0.1Mn1.9O4(M=Li,Ni)正极材料进行了表面改性研究.X射线衍射及电子探针线扫描分析表明,表面改性以后的晶粒仍为尖晶石结构,表面改性离子Co的浓度由表及里逐步减小.电解液溶蚀实验及电化学循环测试表明,表面改性后的正极材料LiM0.1Mn1.9O4的抗溶蚀性明显增强,循环性能优良.性能改善的原因是表面改性以后,尖晶石晶粒表层Mn3+离子浓度降低,Mn4+离子浓度大大增加,减少了Mn3+发生歧化反应的机会.
参考文献
[1] | Huang Haitao, Vincent C A, Bruce P G. J. Electrochem. Soc., 1999, 146 (2): 481-485. |
[2] | Dong H Jang, Seung M Oh. J. Electrochem. Soc., 1997, 144 (10): 3342-3347. |
[3] | Arora P, White R E, Doyle M. J. Electrochem. Soc., 1998, 145: 3647-3667. |
[4] | 罗穗莲,李伟善,邱仕洲.电池,2001,31(1):44-47. |
[5] | Amatucci G G, Blyr A, Sigala C, et al. Solid State Ionics, 1997, 104: 13-25. |
[6] | Pasquier A Du, Orsini F, Gozdz A S, et al. Journal of Power Source, 1999, 81-82: 607-611. |
[7] | Cho Jaephil, Kim Geunbae. Electrochemical and Solid-State Letters, 1999, 2 (6): 253-255. |
[8] | Mladenov M, Stoyanova R, Zhecheva E, et al. Electrochemistry Communications, 2001, 3: 410-416. |
[9] | Ho-Jin Kweon, Dong Gon Park. Electrochemical and Solid-State Letters, 2000, 3 (3): 128-130. |
[10] | Ying Jierong, Wan Chunrong, Jiang Changyin. Journal of Power Source, 2001, 102: 162-166. |
[11] | Kweon Ho-Jin, Kim Sue Joo, Park Dong Gon. Journal of Power Siurces, 2000, 88: 255-261. |
[12] | Gao Yuan, Reimers J N, Dahn J R. Physical Review B, 1996- Ⅱ , 54 (6): 3878-3883. |
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