Synthesis of LiNi_0.8Co_0.2O₂ in Air Atmosphere and its Characterization

【摘要】 <正> The commercialized lithium secondary cells need the electrode materials with high speeific capacity, lower pollution and lower price. Certain industrial materials （ NiSO₄, CoSO₄ , LiOH·H₂O）were used to synthesize Ni_0.8Co_0.2（OH）₂ of a stratified structure, when various synthesis conditions such as pH, reaction temperature et al. were controlled strictly. After LiOH·H₂O and Ni_0.8Co_0.2 （OH）₂were calcinated in air atmosphere, LiNi_0.8Co_0.2O₂ positive electrode materials with good layered crystal structure was obtained. Tests showed that the optimal calcination temperature in air atmosphere was about at 720℃ and LiNi_0.8Co_0.2O₂ synthesized in the above conditions had good electrochemical properties and a low cost. The first specific: discharge capacity of the material was 186 mAh/g, and the specific discharge capacity was 175 mAh/g after 50 cycles at a 0.2C rate, between 3.0～4.2 V with a discharge deterioration ratio of 0.22% each cycle. Tests showed that LiNi_0.8Co_0.2O更多还原

【Abstract】 The commercialized lithium secondary cells need the electrode materials with high speeific capacity, lower pollution and lower price. Certain industrial materials （ NiSO₄, CoSO₄ , LiOH·H₂O）were used to synthesize Ni_0.8Co_0.2（OH）₂ of a stratified structure, when various synthesis conditions such as pH, reaction temperature et al. were controlled strictly. After LiOH·H₂O and Ni_0.8Co_0.2 （OH）₂were calcinated in air atmosphere, LiNi_0.8Co_0.2O₂ positive electrode materials with good layered crystal structure was obtained. Tests showed that the optimal calcination temperature in air atmosphere was about at 720℃ and LiNi_0.8Co_0.2O₂ synthesized in the above conditions had good electrochemical properties and a low cost. The first specific: discharge capacity of the material was 186 mAh/g, and the specific discharge capacity was 175 mAh/g after 50 cycles at a 0.2C rate, between 3.0～4.2 V with a discharge deterioration ratio of 0.22% each cycle. Tests showed that LiNi_0.8Co_0.2O₂ positive electrode materials was a promising candidate to replace the commereialized LiCoO₂ for lithium secondary batteries.更多还原