Modification on the structural stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode materials via Pr-doping by the solid-stat
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ORIGINAL PAPER
Modification on the structural stability of LiNi0.8Co0.1Mn0.1O2 cathode materials via Pr-doping by the solid-state method Shenghong Chang 1,2 & Yunjiao Li 1,2 & Junchao Zheng 1,2 & Dianwei Zhang 1,2 & Jiachao Yang 1,2 & Yongxiang Chen 1,2 & Jia Guo 1,2 & Jie Zhu 1,2 & Yike Xiong 1,2 & Wei Li 2,3 Received: 26 April 2020 / Revised: 18 June 2020 / Accepted: 14 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this research, the Pr-doped LiNi0.8Co0.1Mn0.1O2 material was prepared successfully via the solid-state method. The significant improvement on the material structural stability was confirmed by the experimental results (XRD, SEM, and XPS, etc.). What’s more, the Pr-2500 sample exhibited the best electrochemical performance with the capacity retention rate 94.43% (3.0–4.4 V, 1 C (180 mA g−1), 25 °C, after 100 cycles), while the capacity retention rate of the Pristine was only 83.40%. Furthermore, the degree of the electrochemical polarization and the electrochemical impedance were reduced after modification. The excellent electrochemical properties were ascribed to the higher structure stability after modification, and the more stable structure may benefit from the higher bond dissociation energies (753 kJ mol−1) of Pr-O. Keywords LiNi0.8Co0.1Mn0.1O2 . Solid-state method . Doping . Structure stability
Introduction With the environment pollution increasing, the electric energy, a green energy, has been gradually valued by people. Simultaneously, the materials to store electric energy have been widely studied by researchers [1–6]. Additionally, the LiNi0.8Co0.1Mn0.1O2 gradually stands out from a variety of battery materials because of its higher discharge specific capacity. Nowadays, LiNi0.8Co0.1Mn0.1O2 has been widely applied to the field of energy storage [7, 8]. However, its higher discharge specific capacity accompanies with many disadvantages [9–11]. As we all know, the Li/Ni cation mixing caused Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03700-8) contains supplementary material, which is available to authorized users. * Yunjiao Li [email protected] 1
School of Metallurgy and Environment, Central South University, Changsha 410083, People’s Republic of China
2
Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, China
3
Citic Dameng Mining Industries Limited, Nanning 530028, People’s Republic of China
by the similar ionic radius of Li+ and Ni2+ and the collapse of the material structure during the diffusion of Li+ can deteriorate the performance of lithium-ion battery materials. When Ni2+ occupies the position of Li+, the diffusion of Li+ can be hindered by the immobility of Ni2+, so an excess of immobility of Ni2+ is harmful to the electrochemical properties of the material. Additionally, the Mn, in favor of stabilizing the material structure, is lower in high-nickel cathode materials, and a lower content of Mn ca
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