尖晶石LiNi0.5Mn1.5O4正极材料首周充放电过程的结构与动力学研究

doi:10.13208/j.electrochem.150325

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (4): 312-318. doi: 10.13208/j.electrochem.150325

尖晶石LiNi_0.5Mn_1.5O₄正极材料首周充放电过程的结构与动力学研究

王琴¹，周丽丽¹，沈重亨¹，王琪¹，黄令^1*，李君涛²，孙世刚¹

1. 厦门大学化学化工学院化学系，福建厦门 361005；2. 厦门大学能源研究院，福建厦门 361005

收稿日期:2015-03-25 修回日期:2015-04-17 出版日期:2015-08-28 发布日期:2015-08-28
通讯作者: 黄令 E-mail:huangl@xmu.edu.cn
基金资助:
国家自然科学基金项目（No. 21273184，No. 21321062）及973项目（No. 2015CB251102）资助

Structural and Dynamic Studies of Spinel LiNi_0.5Mn_1.5O₄Cathode Material during Initial Charge/Discharge Processes

WANG Qin¹, ZHOU Li-li¹, SHEN Chong-heng¹, WANG Qi¹, HUANG Ling^1*, LI Jun-tao², SUN Shi-gang¹

1. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. School of Energy Research, Xiamen University, Xiamen 361005, Fujian, China

Received:2015-03-25 Revised:2015-04-17 Published:2015-08-28 Online:2015-08-28
Contact: HUANG Ling E-mail:huangl@xmu.edu.cn

摘要/Abstract

摘要： 以NaOH为沉淀剂，采用共沉淀法制备尖晶石LiNi_0.5Mn_1.5O₄正极材料，使用X-射线衍射（XRD）、傅里叶转换红外光谱（FTIR）和扫描电镜（SEM）分析材料结构与表面形貌. 结果表明，该材料属于空间群的无序尖晶石LiNi_0.5Mn_1.5O₄材料，由八面体粒子团聚成3 ~ 6 μm的大粒子. 恒电流充放电结果显示，材料在0.1C倍率下首周放电比容量为121.5 mAh·g^-1，经过150周充放电后，材料比容量无明显衰减，其容量保持率为99%. 用PITT和原位XRD联用技术研究了充放电过程中材料的结构与锂离子扩散系数之间的关系. PITT法测得材料中锂离子的扩散系数为10^-10 ~ 10^-11 cm²·s^-1.

关键词: 锂离子电池, 正极材料, 共沉淀方法, 锂离子扩散系数, 原位XRD

Abstract: The spinel LiNi_0.5Mn_1.5O₄material was synthesized by co-precipitation method with NaOH as a precipitant. The structure and morphology of the as-prepared LiNi_0.5Mn_1.5O₄ materials were characterized by means of XRD、FTIR and SEM. The results indicated that the material belonged to space group and consisted of octahedral particles with the sizes of 3 ~ 6 μm. Electrochemical tests showed the first discharge specific capacity of 121.5 mAh·g^-1 at 0.1C. After 150 cycles, about 99% of reversible capacity was retained for the LiNi_0.5Mn_1.5O₄material. A combining potentiostatic intermittent titration technique (PITT) with in-situ XRD measurement was applied for discussing the relationship between lattice parameter and the diffusion coefficient of lithium ion (D_Li+) during the first charging-discharging processes. The D_Li+ value measured by PITT was in the range of 10^-10 ~ 10^-11 cm²·s^-1

Key words: Li-ion battery, co-precipitation, the Li ion diffusion coefficient, in-situ XRD, potentiostatic intermittent titration technique

中图分类号:

TM912.9
O646

王琴, 周丽丽, 沈重亨, 王琪, 黄令, 李君涛, 孙世刚. 尖晶石LiNi_0.5Mn_1.5O₄正极材料首周充放电过程的结构与动力学研究[J]. 电化学（中英文）, 2015, 21(4): 312-318.

WANG Qin, ZHOU Li-li, SHEN Chong-heng, WANG Qi, HUANG Ling, LI Jun-tao, SUN Shi-gang. Structural and Dynamic Studies of Spinel LiNi_0.5Mn_1.5O₄Cathode Material during Initial Charge/Discharge Processes[J]. Journal of Electrochemistry, 2015, 21(4): 312-318.

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https://electrochem.xmu.edu.cn/CN/Y2015/V21/I4/312

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尖晶石LiNi_0.5Mn_1.5O₄正极材料首周充放电过程的结构与动力学研究

Structural and Dynamic Studies of Spinel LiNi_0.5Mn_1.5O₄Cathode Material during Initial Charge/Discharge Processes

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