Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (1): 111-117.doi: 10.19799/j.cnki.2095-4239.2020.0236

• Energy Storage Materials and Devices • Previous Articles     Next Articles

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

Jixian WANG1,2(), Sikan PENG1,2, Wenzheng NAN1,2, Xiang CHEN1,2, Chen WANG1,2, Shaojiu YAN1,2(), Shenglong DAI1,2   

  1. 1.AECC Beijing Institute of Aeronautical Materials
    2.Beijing Institute of Graphene Technology Company Limited, Beijing 100095, China
  • Received:2020-07-03 Revised:2020-07-17 Online:2021-01-05 Published:2021-01-08
  • Contact: Shaojiu YAN E-mail:wangjixian520@163.com;shaojiuyan@126.com

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 Li1.22Mn0.52Ni0.26O2 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: