Synthesis of high-capacity LiNi0.8Co0.1Mn0.1O2 cathode by transition metal acetates
(Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China)
Kunming 650093, China)
Abstract: LiNi0.8Co0.1Mn0.1O2 cathode was synthesized using transition metal acetates under different synthesis conditions. Simultaneous thermogravimetric–differential scanning calorimetry–derivative thermogravimetric analysis was applied to investigating the mixture of transition metal acetates. X-ray powder diffraction and charge–discharge test were adopted to characterize the as-prepared LiNi0.8Co0.1Mn0.1O2. The mixture of transition metal acetates undergoes dehydration and decomposition during heating. All the examined LiNi0.8Co0.1Mn0.1O2 samples have a layered structure with space group. LiNi0.8Co0.1Mn0.1O2 samples prepared with different lithium sources under different synthesis conditions exhibit very different charge–discharge performances. The sample synthesized via the procedure of sintering at 800 °C after heating lithium carbonate and transition metal acetates at 550 °C achieves a highest capacity of 200.8 mA·h/g and an average capacity of 188.1 mA·h/g in the first 20 cycles at 0.2C.
Key words: Ni-rich cathode material; transition metal acetate; lithium source; synthesis procedure