Novel lithium insertion material of LiCo1/3Ni1/3Mn1/3O2 for advanced lithium-ion batteries

A novel lithium insertion material of LiCo 1/3 Ni 1/3 Mn 1/3 O 2 was reported for advanced lithium-ion batteries. LiCo 1/3 Ni 1/3 Mn 1/3 O 2 (R3m; a = 2.862(2) A and c = 14.227(8) A in hexagonal setting) shows about 200 mAh g -1 of rechargeable capacity with rate capability as high as 1.6 A g -1 between voltages of 2.5 and 4.6 V. Preliminary cycle tests of a Li/LiCo 1/3 Ni 1/3 Mn 1/3 O 2 cell were also carried out for 30 cycles and shows that loss of rechargeable capacity was negligible. Thermal behavior of fully charged LiCo 1/3 Ni 1/3 Mn 1/3 O 2 was examined by differential scanning calorimetry and shown that the exothermic reaction of 0.88 Li 0.12 Co 1/3 Ni 1/3 Mn 1/3 O 2 with electrolyte is much milder than that of □NiO 2 or □CoO 2 . From these results we have discussed whether or not this material can be used for advanced lithium-ion batteries.