マンガン系リチウム電池用ナノ電極粒子の開発

抄録

Spherical lithium manganate fine particles were successfully prepared by the aerosol process using metal nitrate solution. As-prepared particles had a porous microstructure and were nonagglomerated, which had an average diameter of about 1μm with narrow size distribution. XRD showed that asprepared powders were well crystallized to spinel structure with Fd3m space group. Chemical analysis revealed that the concentration of as-prepared particles was good agreement with that of the starting solution. As-prepared lithium manganate powders were used as cathode active material for lithium secondary battery and its electrochemical properties were investigated at the range from 3.5 and 4.3 V. The charge/discharge capacity of lithium manganate was 120 mAh/g at the rate of 1C. The discharge capacity of lithium manganate exhibited 30mAh/g at the rate of 9C. The charge/discharge capacity of lithium manganate was higher than that of commercial lithium manganate powders. The cycle performance of lithium manganate obtained from spray pyrolysis was superior to that of commercial lithium manganate powders. The battery module for electric bicycle was also developed. The performance of developed battery module was expected for pure electric vehicle (EV) and hybrid EV.