COKE VS. GRAPHITE AS FAST CHARGING ANODE MATERIAL FOR LITHIUM ION BATTERIES

摘要

A lithium ion cell with a graphite anode suffers from graphite's sluggish lithium intercalation reaction during the cell charge. In contrast to the slow lithium ion diffusion process of graphite, coke type disordered carbon anode shows relatively faster charge capability in lithium ion cell. In this paper, we have carried out a series of comparative experiments between graphite and coke based cells with same lithium manganese oxide as cathode. A mathematical lithium ion cell simulation model has also been used to explore the difference between graphite and coke anode during cell charge and discharge. The simulation results show a consistent picture that coke is a intrinsically better fast charge anode material for lithium ion cells.