喷雾干燥法制备富锂正极材料及其电化学性能

doi:10.11901/1005.3093.2018.690

材料研究学报

2019, Vol. 33

Issue (7): 481-487 DOI: 10.11901/1005.3093.2018.690

研究论文

本期目录 | 过刊浏览

喷雾干燥法制备富锂正极材料及其电化学性能

周鹏飞,张鹏(

),杜云慧,王玉洁,左成

北京交通大学机械与电子控制学院北京 100044

Preparation and Electrochemical Properties of Li-rich Cathode Material Prepared by Spray Drying Method

Pengfei ZHOU,Peng ZHANG(

),Yunhui DU,Yujie WANG,Cheng ZUO

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

引用本文:

周鹏飞,张鹏,杜云慧,王玉洁,左成. 喷雾干燥法制备富锂正极材料及其电化学性能[J]. 材料研究学报, 2019, 33(7): 481-487.
Pengfei ZHOU, Peng ZHANG, Yunhui DU, Yujie WANG, Cheng ZUO. Preparation and Electrochemical Properties of Li-rich Cathode Material Prepared by Spray Drying Method[J]. Chinese Journal of Materials Research, 2019, 33(7): 481-487.

全文: PDF(6378 KB) HTML

摘要:

用喷雾干燥法制备Li_1.2Mn_0.54Ni_0.13Co_0.13O₂富锂正极材料并表征其结构、形貌以及电化学性能,研究了烧结温度对材料电化学性能的影响。结果表明：这种正极材料具有良好的层状结构,一次颗粒粒径为100 nm左右且分布均匀,样品的首次放电比容量为220.2 mAh/g,库伦效率为72.5%,18个循环后容量保持率为96.8%。电化学阻抗和循环伏安特性的测试结果表明,这种正极材料具有良好的电化学性能。

关键词 ：材料学, 喷雾干燥法, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂, 正极材料, 电化学性能

Abstract：

Li-rich cathode material of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ was prepared by spray drying method. The structure, morphology and electrochemical properties of the materials were characterized and the effect of sintering temperature on electrochemical properties of the material were investigated. Results show that the cathode material has a good layered structure, the primary particles exhibited rather uniform size distribution with average size of 100 nm. The initial discharge specific capacity of the prepared material can reach 220.2 mAh/g. The coulomb efficiency of the material prepared by sintering at 800oC can reach 72.5%, and the capacity retention rate can reach 96.8% after 18 cycles. Meanwhile, it also showed good electrochemical performance in electrochemical impedance and cyclic voltammetry.

Key words： materials science spray drying method Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode material electrochemical performance

收稿日期: 2018-12-05

ZTFLH:

TM911

基金资助:北京市自然科学基金(2162036)

作者简介: 周鹏飞,男,1992年生,硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.690 或 https://www.cjmr.org/CN/Y2019/V33/I7/481

图1 富锂正极材料前驱体的TG-DTA曲线

图2 在不同温度烧结的Li1.2Mn0.54Ni0.13Co0.13O2的XRD谱图

表1 在不同温度烧结的Li1.2Mn0.54Ni0.13Co0.13O2的晶胞参数

图3 在800℃烧结的样品的SEM图像

图4 800℃烧结样品的TEM图像

图5 在不同温度烧结的富锂正极材料的首次充放电曲线

表2 在不同温度烧结的富锂正极材料的首次充放电性能

图6 在不同温度烧结的富锂正极材料不同循环的充放电曲线

图7 在不同温度烧结的富锂正极材料的放电中值电压比较

图8 在不同温度烧结的富锂正极材料的循环性能曲线

表3 在不同烧结温度制备的富锂正极材料的循环性能参数

图9 在800℃烧结的富锂正极材料的循环伏安曲线

图10 在不同温度烧结的富锂正极材料的EIS阻抗谱和等效电路

表4 在不同温度烧结的富锂正极材料的等效电路阻抗

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