引用本文:
陈永翀, 徐兴军, 崔宏芝, 代克化, 宋兆爽, 江卫军, 其鲁. LiNixMn2-xO4正极材料合成反应机理与性能[J]. 物理化学学报,
2007, 23(0): 26-30.
doi:
10.3866/PKU.WHXB2007Supp07
Citation: CHEN Yong-Chong, XU Xing-Jun, CUI Hong-Zhi, DAI Ke-Hua, SONG Zhao-Shuang, JIANG Wei-Jun, QI Lu. Synthesis Mechanisms and Properties of Cathode Material LiNixMn2-xO4[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 26-30. doi: 10.3866/PKU.WHXB2007Supp07
Citation: CHEN Yong-Chong, XU Xing-Jun, CUI Hong-Zhi, DAI Ke-Hua, SONG Zhao-Shuang, JIANG Wei-Jun, QI Lu. Synthesis Mechanisms and Properties of Cathode Material LiNixMn2-xO4[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 26-30. doi: 10.3866/PKU.WHXB2007Supp07
LiNixMn2-xO4正极材料合成反应机理与性能
摘要:
采用固相反应法和湿化学法制备LiNixMn2-xO4正极材料, 分析了合成反应机理. X射线衍射表明, 采用固相反应法合成前驱物时, 得到的是Ni1Mn2O4+Mn2O3混合物而不是成分分布均匀的固溶相Ni3/4Mn1/4Mn2O4, 因此最终容易生成贫镍的尖晶石结构LiNixMn2-xO4(0<x<0.5)和NiO+LixNi1-xO 杂相物质, 导致材料的电化学性能不够理想. 湿化学法合成LiNixMn2-xO4正极材料, 颗粒大小均匀, 材料电化学循环性能良好, 在1.5C的放电电流密度下, 材料的初始放电容量为116 mAh·g-1, 200次循环后仍保持为105 mAh·g-1, 但其4.7 V高电压容量仍需要进一步改善.
English
Synthesis Mechanisms and Properties of Cathode Material LiNixMn2-xO4
Abstract:
The synthesis reaction mechanisms were analyzed for the cathode materials LiNixMn2-xO4, which were synthesized by the solid-state reaction method and the wet-chemical method, respectively. XRD data indicated that a mixture precursor of Ni1Mn2O4 and Mn2O3 would be preferred for a solid solution of Ni3/4Mn1/4Mn2O4 when the solid-state reaction method was used for the material synthesis. As a result, the last product would be the mixture of NiO, LixNi1-xO and spinel LiNixMn2-xO4 (0<x<0.5) and naturally the electro-chemical performance was poor. The cathode material LiNixMn2-xO4 with excellent cycle performance was synthesized by the wet-chemical method. The first discharge capacity was 116 mAh·g-1 and the capacity after 200 cycles retains 105 mAh·g-1 on the discharge rate of 1.5C. Yet the capacity of the 4.7 V potential needs for further improvement.
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