Synthesis and electrochemical properties of layered Li(Ni_(3/8)Co_(3/8)Mn_(2/8))O_2 cathode material for lithium ion batteries

The layered Li(Ni3/8Co3/8Mn2/8)O2 cathode material for lithium ion batteries was synthesized by hydroxide co-precipitation method. The structure and electrochemical properties of Li(Ni3/8Co3/8Mn2/8)O2 were characterized by X-ray diffractometry, scanning electron microscopy, atomic absorption spectroscopy, and galvanostatic charge-discharge cycling. The results show that Li(Ni3/8Co3/8Mn2/8)O2 powder sample synthesized at 900 ℃ for 10 h reveals good intergration electrochemical properties and well-ordered hexagonal layered structure with low cation mixing. The value of I003/I104 is 1.25. The value of R is 0.48. The particles with 4.5 μm size can be identified from SEM observations. The initial discharge capacity of the Li[Ni1/3Co1/3Mn1/3]O2 cathode is 172.9 mA·h/g in the voltage range of 2.8?4.5 V at 30 ℃ and 1C, and the initial capacity maintains 96.1% after 20 charge-discharge cycles at 0.2C.