喷雾干燥法制备石墨烯包覆富锂锰基材料Li1.22Mn0.52Ni0.26O2及其电化学性质

doi:10.19799/j.cnki.2095-4239.2020.0236

摘要/Abstract

摘要：

本工作采用喷雾干燥法制备了小片径石墨烯包覆的Li_1.22Mn_0.52Ni_0.26O₂富锂锰基材料(G-LNMO)，系统研究了包覆前后材料的晶体结构、微观形貌及电化学性质。扫描电镜(SEM)及透射电镜(TEM)结果表明，该方法实现了石墨烯对富锂锰基材料(LNMO)的均匀包覆。充放电测试表明，石墨烯包覆后将LNMO材料在0.1 C和1 C倍率下的放电容量分别从199.8 mA·h/g和87.1 mA·h/g提升至220.2 mA·h/g和117.6 mA·h/g。在0.5 C倍率下经过100次循环后，G-LNMO材料的容量保持率为88%，相比于LNMO材料提升了17%。电池充放电曲线及电化学阻抗分析显示，石墨烯包覆能够显著提升电极动力学，降低电池在充放电过程中的极化，减缓电极/电解液界面副反应的发生，进而提升材料的循环稳定性和倍率性能。

关键词: 富锂锰基材料, 石墨烯, 表面包覆, 喷雾干燥, 电化学性能

Abstract:

A graphene-coated lithium rich manganese-based composite (G-LNMO) was synthesized using spray drying and was investigated as cathode material for lithium-ion batteries. The effect of graphene coating on the electrochemical performance was investigated systematically. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that in G-LNMO, graphene nanosheets are uniformly dispersed and particles of Li_1.22Mn_0.52Ni_0.26O₂ are coated with the graphene nanosheets. Charge-discharge curves and electrochemical impedance spectroscopy (EIS) indicate that the structure of particles coated by graphene nanosheets can enhance the electron migration and alleviate the polarization of a pristine sample, leading to improved cycling stability and a high-rate capability. At 0.1 C and 0.5 C, the pristine and graphene-coated samples delivered capacities of 199.8 and 220.2 mA·h/g, and after 100 cycles, retained a capacity of 71% and 88%, respectively. This simple and scalable approach can be applied to the industrial production of graphene coated and lithium rich manganese-based oxides.

Key words: lithium rich manganese-based oxide, grapheme, surface coating, spray drying, electrochemical performance

中图分类号:

TM 911

王继贤, 彭思侃, 南文争, 陈翔, 王晨, 燕绍九, 戴圣龙. 喷雾干燥法制备石墨烯包覆富锂锰基材料Li_1.22Mn_0.52Ni_0.26O₂及其电化学性质[J]. 储能科学与技术, 2021, 10(1): 111-117.

Jixian WANG, Sikan PENG, Wenzheng NAN, Xiang CHEN, Chen WANG, Shaojiu YAN, Shenglong DAI. Preparation of graphene-coated Li_1.22Mn_0.52Ni_0.26O₂ using a spray drying method for lithium-ion batteries[J]. Energy Storage Science and Technology, 2021, 10(1): 111-117.

图/表 6

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喷雾干燥法制备石墨烯包覆富锂锰基材料Li_1.22Mn_0.52Ni_0.26O₂及其电化学性质

Preparation of graphene-coated Li_1.22Mn_0.52Ni_0.26O₂ using a spray drying method for lithium-ion batteries

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