材料科学
阴极
电化学
法拉第效率
锂(药物)
电极
离子
分析化学(期刊)
八面体
兴奋剂
化学工程
物理化学
工程类
物理
内分泌学
医学
化学
量子力学
光电子学
色谱法
作者
Dao Yong Wan,Zhi Yu Fan,Yong Xiang Dong,Erdenebayar Baasanjav,Hang‐Bae Jun,Bo Jin,En Mei Jin,Sang Mun Jeong
摘要
NCA (LiNi 0.85 Co 0.10 Al 0.05- x M x O 2 , M=Mn or Ti, x < 0.01) cathode materials are prepared by a hydrothermal reaction at 170°C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn 4+ and Ti 4+ were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g −1 after the first cycle, almost 23 mAh g −1 higher than that obtained with the undoped NCA electrode, and 166.7 mAh g −1 after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.
科研通智能强力驱动
Strongly Powered by AbleSci AI