Synergistic effect of Li 2 MgTi 3 O 8 coating layer with dual ionic surface doping to improve electrochemical performanc
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ORIGINAL PAPER
Synergistic effect of Li2MgTi3O8 coating layer with dual ionic surface doping to improve electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials Leiwu Tian 1,2 & Haifeng Yuan 1,2 & Qinjun Shao 1,2 & Syed Danish Ali Zaidi 1,2 & Chong Wang 1 & Jian Chen 1 Received: 8 May 2020 / Revised: 3 June 2020 / Accepted: 14 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Surface modification plays a vital role in improving the rate performance and cycling stability of layered Ni-rich LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials for Li-ion batteries. In this study, Li2MgTi3O8 (LMTO)-coated NCM622 was successfully synthesized by wet coating combined with sintering process. The results of morphological analysis showed a uniform LMTO layer coated on the surface of NCM622 materials. The dual ions of Ti4+ and Mg2+ on surface structure of NCM622 were identified by X-ray diffraction and X-ray photoelectron spectroscopy. The surface coating layer prevented the direct contact between the active cathode material and the electrolyte which significantly reduced the side reactions, and the doping of Ti4+ and Mg2+ improved the structural stability of the NCM622 materials. The electrochemical performance indicates that NCM622 cathode with a coating layer of 0.5 wt% LMTO exhibited excellent cycle stability and maintained a capacity retention up to 76% after 200 cycles at 25 °C at 1 C-rate, which was higher than the value of 52% for the NCM622. Keywords Lithium-ion battery . LiNi0.6Co0.2Mn0.2O2 . Li2MgTi3O8 . Surface coating . Surface doping
Introduction In facing with the increasing energy demands and environmental pollution caused by fossil energy, the development of sustainable energy storage system has become more and more critical. Rechargeable Li-ion batteries have been widely applied in electric vehicles, portable electronic devices, and aerospace industries due to their high energy density and low self-discharge [1–3]. However, the conventional Li-ion battery prepared with LiCoO2 cathode material could not satisfy Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03665-8) contains supplementary material, which is available to authorized users. * Chong Wang [email protected] * Jian Chen [email protected] 1
Advanced Rechargeable Battery Laboratory, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, Liaoning, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
the increasing demands of high specific energy, low cost, and high safety [4, 5]. The layered Ni-rich cathode materials (LiNixCoxMnzO2, x ≥ 0.6, x + y + z = 1) have drawn much attention among the various advanced cathode materials, i.e., LiCoO2, LiFePO4, LiMn2O4, and LiNi1.5Mn0.5O4, owning to its higher energy density, lower price, and thermal stability [6]. Unfortunately, the Ni-rich cathode materials have always been encountered with some cr
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