Improvement of cycling and thermal stability of LiNi 0.8 Mn 0.1 Co 0.1 O 2 cathode material by secondly treating process

(Ni 0.8 Mn 0.1 Co 0.1 )(OH) 2 and Co(OH) 2 secondly treated by LiNi 0.8 Mn 0.1 Co 0.1 O 2 have been prepared via co-precipitation and high-temperature solid-state reaction. The residual lithium contents, XRD Rietveld refinement, XPS, TG-DSC, and electrochemical measurements are carried out. After secondly treating process, residual lithium contents decrease drastically, and occupancy of Ni in 3a site is much lower and Li/Ni disorder decreases. The discharge capacity is 193.1, 189.7, and 182 mAh g −1 at 0.1 C rate, respectively, for LiNi 0.8 Mn 0.1 Co 0.1 O 2 -AP, -NT, and -CT electrodes between 3.0 and 4.2 V in pouch cell. The capacity retention has been greatly improved during gradual capacity fading of cycling at 1 C rate. The noticeably improved thermal stability of the samples after being treated can also be observed.