Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (7): 2116-2123.doi: 10.19799/j.cnki.2095-4239.2024.0408

• Special Issue on Low Temperature Batteries • Previous Articles     Next Articles

Multicomponent-coated graphite composite anodes for low-temperature electrochemical energy storage

Pengfei XIAO(), Lin MEI(), Libao CHEN()   

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, China
  • Received:2024-05-07 Revised:2024-06-03 Online:2024-07-28 Published:2024-07-23
  • Contact: Lin MEI, Libao CHEN E-mail:761758726@qq.com;meilin@csu.edu.cn;lbchen@csu.edu.cn

Abstract:

The rapid development of new energy technologies has demanded higher requirements for the application of lithium-ion batteries (LIBs) for operation at low temperatures. The poor surface dynamics of graphite anodes is one of the main issues limiting the low-temperature performance of LIBs. In this study, amorphous carbon/niobium oxide multicomponent-coated graphite composite materials (C/Nb-Gr) were synthesized using a liquid-phase method. The optimal C/Nb-Gr ratio was determined by adjusting the preparation method and coating ratio of multicomponent materials. The crystal structure, morphology, and elemental distribution of C/Nb-Gr were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Furthermore, its electrochemical performance at high rates and low temperatures was evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge cycling. The graphite electrode coated with amorphous carbon/niobium oxide exhibited improved performance at high rates and low temperatures. When charged/discharged at a high current density of 5C at room temperature, C/Nb-Gr-10 demonstrated a reversible specific capacity of 156.18 mAh/g. Under low-temperature conditions (-20 ℃) at a current density of 0.1C, the discharge specific capacity of C/Nb-Gr-10 was 204.60 mAh/g, representing 55.7% of its room-temperature discharge specific capacity.

Key words: graphite anodes, surface modification, low-temperature energy storage, lithium-ion batteries

CLC Number: