引用本文:
江卫军, 赛喜雅勒图, 乌云毕力格, 其鲁, 商士波. 非化学计量比的Li1+xCoO2正极材料的性能[J]. 物理化学学报,
2007, 23(0): 56-59.
doi:
10.3866/PKU.WHXB2007Supp13
Citation: JIANG Wei-Jun, QI Lu, SHANG Shi-Bo. Performance of Nonstoichiometric Li1+xCoO2 Cathode Materials[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 56-59. doi: 10.3866/PKU.WHXB2007Supp13
Citation: JIANG Wei-Jun, QI Lu, SHANG Shi-Bo. Performance of Nonstoichiometric Li1+xCoO2 Cathode Materials[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 56-59. doi: 10.3866/PKU.WHXB2007Supp13
非化学计量比的Li1+xCoO2正极材料的性能
摘要:
以不同的nLi/nCo比例合成LiCoO2和非化学计量比的Li1+xCoO2(x=0.02, 0.05)正极材料. 采用扫描电子显微镜(SEM)、X射线粉末衍射(XRD)、电感耦合等离子体鄄原子发射光谱(ICP-AES)、激光粒度分布、BET法和电化学等方法对生成物质进行了晶体结构、元素组成、物理性能和电化学性能等分析. 结果表明, 过量的碳酸锂能改变生成物质的表面形貌、增大粒径、降低比表面积和提高密度. 同时, 过量的Li 元素能抑制不利的相转变, 提高物质的结构稳定性, 50次循环的平均衰减率从1.9‰降低到1.3‰.
English
Performance of Nonstoichiometric Li1+xCoO2 Cathode Materials
Abstract:
LiCoO2 and nonstoichiometric Li1+xCoO2(x=0.02, 0.05) cathode materials were synthesized under various nLi/nCo ratio. X-rayDiffraction (XRD), scanning electronic microscope (SEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), laser particle size distribution, BET and electrochemical analysis were used to characterize the materials. The results showed that excess Li2CO3 added could smooth particles’surface, enlarge particles’size, reduce particles’ specific surface area and increase materials’density. The results of electrochemical analysis also indicated that excess Li in LiCoO2 could suppress the disadvantageous crystal phase change, stabilize materials’ structure and decrease the average loss ratio to 1.3‰ from 1.9‰ during 50 cycles.
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