Washing effect on properties of LiNi0.8Co0.15Al0.05O2 cathode material by ethanol solvent
(1. School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China;
2. School of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China)
2. School of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China)
Abstract: Different LiNi0.8Co0.15Al0.05O2 cathode materials were washed by ethanol solvent. Inductively coupled plasma atomic emission spectroscopy (ICP-AES), Fourier transformed infrared (FTIR) spectrum, X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge test and electrochemical impedance spectroscopy (EIS) were used to evaluate the elemental contents, structures, morphologies and electrochemical properties of samples. The results show that ethanol washing can remove effectively the synthetic residues LiOH/Li2O on the freshly-prepared LiNi0.8Co0.15Al0.05O2 and make the sample much more resistant to H2O and CO2, without destroying its bulk structure, surface morphology and electrochemical performances. Moreover, the discharge specific capacity and cycle performance of LiNi0.8Co0.15Al0.05O2 after storage in air with a relative humidity of 80% for three months are improved by immediate ethanol washing.
Key words: lithium-ion battery; LiNi0.8Co0.15Al0.05O2; ethanol washing; storage property; electrochemical performance