Surface modification of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 with Cr_2O_3 for lithium ion batteries

作     者：Li, Xiaowei Lin, Yingbin Liin, Ying Lai, Heng Huang, Zhigao 

作者机构：Physics Department Fujian Normal University Fuzhou 350007 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2012年第31卷第2期

页      面：140-144页

核心收录：

学科分类：0808[工学-电气工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Key Project for Basic Research of China (No. 2005CB623605) the National Natural Science Foundation of China (No. 11074039) the National Science Foundation for Young Scholars (No.11004032) 

主　　题：lithium ion batteries LiNi 1/3 Co 1/3 Mn 1/3 O 2 Cr 2 O 3 coating 

摘      要：Cr 2 O 3-coated LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode materials were synthesized by a novel method. The structure and electrochemical properties of prepared cathode materials were measured using X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The measured results indicate that surface coating with 1.0 wt% Cr 2 O 3 does not affect the LiNi 1/3 Co 1/3 Mn 1/3 O 2 crystal structure (α-NaFeO 2 ) of the cathode material compared to the pristine material, the surfaces of LiNi 1/3 Co 1/3 Mn 1/3 O 2 samples are covered with Cr 2 O 3 well, and the LiNi 1/3 Co 1/3 Mn 1/3 O 2 material coated with Cr 2 O 3 has better electrochemical performance under a high cutoff voltage of 4.5 V. Moreover, at room temperature, the initial discharging capacity of LiNi 1/3 Co 1/3 Mn 1/3 O 2 material coated with 1.0 wt.% Cr 2 O 3 at 0.5C reaches 169 mAh·g 1 and the capacity retention is 83.1% after 30 cycles, while that of the bare LiNi 1/3 Co 1/3 Mn 1/3 O 2 is only 160.8 mAh·g 1 and 72.5%. Finally, the coated samples are found to display the improved electrochemical performance, which is mainly attributed to the suppression of the charge-transfer resistance at the interface between the cathode and the electrolyte.