SiO2-coated LiNi0.915Co0.075Al0.01O2 cathode material for rechargeable Li-ion batteries

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Title:	SiO2-coated LiNi0.915Co0.075Al0.01O2 cathode material for rechargeable Li-ion batteries
Authors:	鄭芳怡;Zhou, Pengfei;Zhang, Zhen;Meng, Huanju;Lu, Yanying;Cao, Jun;Cheng, Fangyi;Tao, Zhanliang;Chen, Jun
Contributors:	地球科學學院大氣科學學系
Date:	2016-12-14
Issue Date:	2026-04-21 14:20:34 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： We reported a one-step dry coating of amorphous SiO 2 on spherical Ni-rich layered LiNi 0.915 Co 0.075 Al 0.01 O 2 (NCA) cathode materials. Combined characterization of XRD, EDS mapping, and TEM indicates that a SiO 2 layer with an average thickness of ∼50 nm was uniformly coated on the surface of NCA microspheres, without inducing any change of the phase structure and morphology. Electrochemical tests show that the 0.2 wt% SiO 2 -coated NCA material exhibits enhanced cyclability and rate properties, combining with better thermal stability compared with those of pristine NCA. For example, 0.2 wt% SiO 2 -coated NCA delivers a high specific capacity of 181.3 mA h g −1 with a capacity retention of 90.7% after 50 cycles at 1 C rate and 25 °C. Moreover, the capacity retention of this composite at 60 °C is 12.5% higher than that of pristine NCA at 1 C rate after 50 cycles. The effects of SiO 2 coating on the electrochemical performance of NCA are investigated by EIS, CV, and DSC tests, the improved performance is attributed to the surface coating layer of amorphous SiO 2 , which effectively suppresses side reactions between NCA and electrolytes, decreases the SEI layer resistance, and retards the growth of charge-transfer resistance, thus enhancing structural and cycling stability of NCA. A homogeneous SiO 2 layer is coated on the surface of NCA microspheres by a facile one-step dry coating method. Compared with pristine NCA, the SiO 2 coated NCA material shows better cyclic performance and thermal stability at an elevated temperature of 60 °C. 出版日期： 2016-11-24 識別號： ISSN: 2040-3364 識別號： EISSN: 2040-3372 識別號： DOI: 10.1039/c6nr07438c
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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