DEVELOPMENT OF 1 KWH (300 AH) CLASS LITHIUM-ION BATTERY

A large-capacity lithium-ion battery of I kWh (300 Ah) class was fabri cated by using LiCoO2 and natural graphite as the cathode and anode ma terials, respectively, and LiPF6 as the electrolyte to develop industr ially usable batteries for energy source. Our battery delivered an ene rgy density of 60 Wh/kg (133 WH/l) with weight and volume of a contain er included with a cycle life of 245 cycles, which was longer compared with that of our former battery using LiBF4 as the electrolyte [5,6], These improvements were achieved by changing the following factors: ( i) use of LLPF6 as the electrolyte; (ii) optimizing the mixing ratio o f the solvent (EC/DEC); (iii) employing a plate spring for the buffer of electrode expansion and shrinkage; (iv) minimizing residual moistur e. (C) 1997 Elsevier Science S.A.