Li₂MnO₃ stabilized LiNi_1/3Co_1/3Mn_1/3O₂ cathode with improved performance for lithium ion batteries

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• 作者：Jiebin Li ; Youlong Xu ; Xifei Li ; Zhangwei Zhang
• 关键词：Lithium ion battery ; Cathode materials ; Solid solution xLi2MnO3· ; (1  ; &minus ;   ; x)LiNi1/3Co1/3Mn1/3O2
• 刊名：Applied Surface Science
• 出版年：15 November, 2013
• 年：2013
• 卷：285
• 期：part_PB
• 页码：235-240
• 全文大小：1938 K

文摘

Li₂MnO₃ stabilized LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials are discussed by xLi₂MnO₃路(1 鈭?#xA0;x)LiNi_1/3Co_1/3Mn_1/3O₂ (x = 0.3 and 0.7) solid solutions. The solid solutions were synthesized by annealing the mixing LiNO₃, Mn(NO₃)₂ and LiNi_1/3Co_1/3Mn_1/3O₂ powder at 900 掳C for 12 h, and it was found that the cathode particle size increased from 200-300 to 300-500 nm. The pristine LiNi_1/3Co_1/3Mn_1/3O₂ showed the 30th discharge capacity of 174.5 mAh g^鈭?. Our results indicated that the introduction of Li₂MnO₃ in the cathode could increase performance. 0.3Li₂MnO₃路0.7LiNi_1/3Co_1/3Mn_1/3O₂ cathode shows higher discharge of 182.0 mAh g^鈭? in the 30th cycle. And the discharge capacity of 214.1 mAh g^鈭? was obtained when the Li₂MnO₃ content increased to 0.7. Moreover, the cyclic performance at 55 掳C was also increased by Li₂MnO₃. For instance, the discharge capacities were 191.2 mAh g^鈭? (x = 0.3) and 229.3 mAh g^鈭? (x = 0.7) and the capacity retentions are 94.9% and 91.4% after 40 cycles, respectively. The DFT calculations show that stable Li₂MnO₃-enriched layer is as a result of enhanced performance.