Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (1): 137-142.doi: 10.19799/j.cnki.2095-4239.2020.0315

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Graphite/nano-Sn composite anode materials for lithium-ion batteries

Zhou JIN1(), Hailong YU1, Wenwu ZHAO1, Guangjin ZHAO2, Xuejie HUANG1()   

  1. 1.Institute of Physics Chinese Academy of Sciences, Beijing 100191, China
    2.Electric Power Science Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, Henan, China
  • Received:2020-09-10 Revised:2020-09-28 Online:2021-01-05 Published:2021-01-08

Abstract:

With the rapid development of electric vehicles, the requirements for power batteries now includes fast-charging and high energy densities. The traditional graphite anode material cannot meet these needs, especially for fast-charging applications. A negative electrode made of tin has a high specific capacity and fast rate performance, but its battery cycle life is limited due to volume expansion/shrinkage and interface stability problems during cycling. In this article, the synthesis of a graphite/nano-Sn composite material is presented, using chemical deposition and high-temperature sintering using SnCl2 and natural graphite as precursors. With surface deposition of nano-sized Sn particles, the graphite prevents aggregation and pulverization of the tin particles during charging and discharging. The graphite/nano-Sn composite anode material significantly improves the rate performance and maintains excellent cycle stability. The anode material demonstrates a stable capacity of 360 mA·h/g after 150 cycles at a current density of 90 mA/g, and a stable capacity of 180 mA·h/g at a current density of 900 mA/g. In contrast, the traditional graphite anode material is only capable of capacities less than 20 mA·h/g at the same current densities.

Key words: Li-ion battery, anode material, nano tin, graphite, graphite-tin composite material

CLC Number: