高电位LiNi0.5Mn1.5O4正极材料制备、电化学性能与结构相变

doi:10.3969/j.issn.2095-4239.2016.01.002

摘要/Abstract

摘要： 尖晶石LiNi_0.5Mn_1.5O₄因其可在4.7 V高电位下工作并有良好的循环特性,已成为最具潜力的高能量密度锂离子电池正极材料。本文首先采用喷雾干燥辅助烧结法制备了LiNi_0.5Mn_1.5O₄正极材料,考察了热处理条件对材料结构与性能的影响。用XRD、SEM和FT-IR等技术对所制备的LiNi_0.5Mn_1.5O₄材料的结构和表面形貌进行表征,利用原位XRD技术研究了LiNi_0.5Mn_1.5O₄正极材料在充放电过程中结构相变规律。结果表明,所制备的LiNi_0.5Mn_1.5O₄材料均具有Fd-3m空间群的立方相尖晶石型结构,并具有优异的电化学性能,其0.1 C时首次放电容量为132 mA·h/g,首轮库仑效率93.48%,高倍率下该材料的电化学性能优越。原位XRD测量结果分析表明,尖晶石型LiNi_0.5Mn_1.5O₄材料在充电过程中存在4个显著的相变过程,在嵌脱锂过程中,从四面体相向立方相结构相变过程是可逆的。

关键词: LiNi0.5Mn1.5O4, 正极材料, 电化学性能, 结构相变, 原位XRD

Abstract: Because of its good electrochemical performance and high operating voltage around 4.7 V, LiNi_0.5Mn_1.5O₄ spinel has become one of the most promising high voltage cathode materials for lithium ion batteries with high energy density. In this paper, we prepared LiNi_0.5Mn_1.5O₄ cathode materials through spray drying assisted annealing process with different heat treating conditions, the effect of heat treatment conditions on the structure and electrochemical performances was investigated. The crystal structures of the prepared LiNi_0.5Mn_1.5O₄ materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transformed infrared spectroscopy (FT-IR). The in situ synchrotron X-ray diffraction technique was carried out to study the online phase transition of LiNi_0.5Mn_1.5O₄spinel during cycling. It has been found that the prepared LiNi_0.5Mn_1.5O₄ powders show phase-pure cubic spinel of Fd-3m structure. Its electrochemical performances were tested at different charge/discharge rates between the potential limit of 3.5~5.0 V, and the initial discharge capacity of the LiNi_0.5Mn_1.5O₄ spinel attained at 132.0 mA·h·g^-1, and the columbic efficiency at first cycle is 93.48%, and the electrochemical performances of the prepared materials are excellent.From the in situ XRD patterns and charge-discharge profile, it can be found that four phase transitions existed for LiNi_0.5Mn_1.5O₄spinel during charge process, the phase transition from tetrahedral to cubic is reversible in the lithium insertion and extraction process.

Key words: LiNi0.5Mn1.5O4, cathode material, electrochemical characteristic, phase transition, in situ XRD

中图分类号:

TM911

李景坤, 杨轲, 文闻, 陆美凤, 马紫峰. 高电位LiNi_0.5Mn_1.5O₄正极材料制备、电化学性能与结构相变[J]. 储能科学与技术, 2016, 5(1): 9-9.

LI Jingkun, YANG Ke, WEN Wen, LU Meifeng, MA Zifeng. Preparation, electrochemical performance and phase transition of high voltage LiNi_0.5Mn_1.5O₄ cathode material[J]. Energy Storage Science and Technology, 2016, 5(1): 9-9.

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高电位LiNi_0.5Mn_1.5O₄正极材料制备、电化学性能与结构相变

Preparation, electrochemical performance and phase transition of high voltage LiNi_0.5Mn_1.5O₄ cathode material

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