Abstract
Mesocarbon microbead (MCMB 2528) and CC composite have been investigated as anodes for lithium-ion batteries using half-cells with lithium counter electrode and three electrode cell systems containing LiCoO 2 cathode and lithium reference electrodes in 1 M LiPF 6 electrolyte (EC/DMC 1:1 v/v). The test results show that the practical capacity of CC composite anode is 50% higher than that of MCMB-based anode (based on total anode weight). The irreversible capacity loss of CC composite is significantly lower than that of MCMB carbon. Lithium-ion cells made with CC composite anode can accept repeated overdischarge without performance deterioration. The extra capacity of CC composite can be utilized to improve energy density and safety issues related to overcharge of lithium-ion cells. Differential scanning calorimetry (DSC) results indicates that the thermal stability of fully charged CC composite anode (lithiated anode) is much better than that of fully charged MCMB anode.
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