Modification of graphite for anode of lithium ion batteries is investigated. Results of X-ray diffraction shows lithium and aluminum exists as Li compound (CH3COOLi dot 2H2O) and Al compound (AlD3) in the graphite, respectively. The Brunauer-Emmer-Teller (BET) surface area of the modified graphite increases. According to the electrochemical measurements of Li/C cell and prototype Li-ion batteries, the Li-doped graphite has large reversible capacity of 312.2 mA dot h/g, low irreversible capacity of 52.9 mA dot h/g, and high initial coulombic efficiency of 85.51%. The 063448 size prototype battery with Li-doped graphite anode has large discharge capacity of 845 mA dot h and good cycling performance. The initial charge/discharge characteristic of Al-doped graphite is close to those of undoped graphite, but the prototype battery with Al-doped anode shows the best cycling performance with capacity retention ratio of 94.06% at the 200th cycle.
Effect of lithium or aluminum substitution on the characteristics of graphite for anode of lithium ion batteries
Rare Metals ; 22 , 4 ; 280-284
2003
5 Seiten, 11 Quellen
Article (Journal)
English
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