Well-ordered spherical LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material for lithium-ion batteries
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ADVANCES IN BATTERY TECHNOLOGY: MATERIAL INNOVATIONS IN DESIGN AND FABRICATION
Well-ordered spherical LiNi0.8Co0.1Mn0.1O2 cathode material for lithium-ion batteries Gai Yang1, Xianzhong Qin1,a)
, Bo Wang1, Feipeng Cai1, Jian Gao2,b)
1
Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan 250014, China New Energy Martials Laboratory, Sichuan Changhong Electric Co., Ltd., Chengdu, Sichuan 610041, China a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] 2
Received: 26 June 2019; accepted: 25 September 2019
Nickel-rich layered oxide LiNi0.8Co0.1Mn0.1O2 suffers from severe structural instability and irreversible capacity loss during cycling due to cation disorder of Li+ and Ni2+. To solve this problem, the precursor Ni0.8Co0.1Mn0.1(OH)2 and well-ordered LiNi0.8Co0.1Mn0.1O2 cathode materials were successfully synthesized via controlled crystallization and high-temperature solid-state methods. The structure, morphology, and electrochemical performance of the precursor and LiNi0.8Co0.1Mn0.1O2 powders were investigated. The results show that the precursor Ni0.8Co0.1Mn0.1(OH)2 is made of sphere-like particles composed of needle-like primary crystal and LiNi0.8Co0.1Mn0.1O2 possesses a perfect layered structure with low Li/Ni disorder. Electrochemical data demonstrate that the material rate capabilities are 203.3, 187.7, 170.4, and 163 mA h/g from 0.1C to 10C, respectively. The capacity retention is 87.9% after 100 cycles at 1C, even the cut-off voltage was increased to 4.5 V. The high discharge capacity and outstanding cycling life can be attributed to the merits of a perfect crystal lattice with low Li/Ni disorder, fast lithium ion transport, and relatively low charge transfer resistance.
Introduction Rechargeable lithium-ion batteries (LIBs) are critical for application in battery electric vehicles (BEVs) due to their high energy and high power densities [1]. However, the lack of better electrochemical performance for cathode materials is the major obstacle for advanced LIBs [2]. Currently, the majority of cathode materials used in LIBs are poly-anion LiFePO4 [3, 4] and layered LiNixCoyMn1xyO2 (NCM) [5, 6]. Among these cathode materials, Ni-rich NCM (x . 0.5) have been investigated because of their high energy density (.300 W h/kg), relatively low cost, and environmental benignancy [7]. Ni-rich layered oxide LiNi0.8Co0.1Mn0.1O2 is one of the most promising cathode materials for high-energy LIBs, which still suffers from severe structural instability and irreversible capacity loss during cycling due to cation disorder of Li1 and Ni21, which hinders lithium diffusion [8]. In addition, the Ni41 in the charged state reacts with the electrolyte, especially at an elevated temperature, and accelerates structural deterioration and side reactions, resulting in poor performance or even safety issues due to oxygen evolution [9]. Various surface or bulk engineering designs have been developed to explore feasible modiļ¬cat
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