SiO2-coated LiNi0.915Co0.075Al0.01O2cathode material for rechargeable Li-ion batteries

• DOI: 10.1039/c6nr07438c
• Publication Date: 2016-10-21T09:25:08Z
• Authors: Pengfei Zhou; Zhen Zhang; Huanju Meng; Yanying Lu; Jun Cao; Fangyi Cheng; Zhanliang Tao; Jun Chen
• Keywords: Thermal Stability

We reported a one-step dry coating of amorphous SiO2 on spherical Ni-rich layered LiNi0.915Co0.075Al0.01O2 (NCA) cathode materials. Combined characterization XRD, EDS mapping, and TEM indicates that layer with an average thickness ∼50 nm was uniformly coated the surface NCA microspheres, without inducing any change phase structure morphology. Electrochemical tests show 0.2 wt% SiO2-coated material exhibits enhanced cyclability rate properties, combining better thermal stability compared those pristine NCA. For example, delivers high specific capacity 181.3 mA h g−1 retention 90.7% after 50 cycles at 1 C 25 °C. Moreover, this composite 60 °C is 12.5% higher than cycles. The effects electrochemical performance are investigated by EIS, CV, DSC tests, improved attributed to SiO2, which effectively suppresses side reactions between electrolytes, decreases SEI resistance, retards growth charge-transfer thus enhancing structural cycling