Preparation of graphene-coated Li1.22Mn0.52Ni0.26O2 using a spray drying method for lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2020.0236

Abstract

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

CLC Number:

TM 911

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.

Figures/Tables 6

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References 31

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

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