Investigation on Electrochemical Property of AB/AI2O3- coated Li-excess Mn-based Layered Oxides

16th International Conference on X-ray Absorption Fine Structure

Kobayashi, H.^1 ; Takada, K.^2 ; Arachi, Y.^2 ; Okumura, T.^1 ; Shikano, M.^1 ; Nitani, H.^3

National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka

563-8577, Japan^1

Kansai University, 3-3-35 Yamate-chuo, Suita, Osaka

564-8680, Japan^2

High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba

305-0801, Japan^3

关键词: C-rate performance;    Cycle performance;    Discharge capacities;    High temperature;    Mechanochemical reactions;    Optimal conditions;    Sample preparation;    XANES measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012129/pdf
DOI  :  10.1088/1742-6596/712/1/012129

来源: IOP

【 摘 要 】

The AB and/or Al2O3-coated Li1.20Mn0.55Ni0.16Co0.09O2were prepared by the mechanochemical reaction. The optimal condition for sample preparation was selected to be the rotation speed of 2000 rpm and the reaction time of 5 minutes by SEM and XANES measurements. Surface analysis using SEM and XANES data demonstrated that all the samples were rather uniformly covered with AB and/or nano-AEO3particles. The AEO3- coated samples showed less discharge capacity and C-rate performance compared with the pristine sample, while the AB/Al2O3-coated sample showed almost the same discharge capacity and C-rate performance and had better cycle performance at 318 K compared with the pristine sample. These results demonstrate that the mechanochemical AB/Al2O3-coating process is an effective way of improving the cycle performance at high temperature without degrading the discharge capacity and C-rate performance.