Abstract
LiNi0.5Mn1.5−x Sn x O4 (0 ≤ x ≤ 0.1) cathode materials with uniform and fine particle sizes were successfully synthesized by a two-step calcination of solid-state reaction method. As the cathode materials for lithium ion batteries, the LiNi0.5Mn1.48Sn0.02O4 shows the highest specific capacity and cycle stability. In the potential range of 3.5–4.9 V at room temperature, LiNi0.5Mn1.48Sn0.02O4 composite material shows a discharge capacity of more than 117 mA h g−1 at 0.1 C, while the corresponding discharge capacity of undoped LiNi0.5Mn1.5O4 is only 101 mA h g−1. Moreover, in cycle performance, all the LiNi0.5Mn1.5−x Sn x O4 (0 ≤ x ≤ 0.1) samples show better capacity retention than the undoped LiNi0.5Mn1.5O4 at 1 C rate after 100 cycles. Especially, for the LiNi0.5Mn1.5O4, the discharge capacity after 100 cycles is 90 mA h g−1, while the corresponding discharge capacities of the undoped LiNi0.5Mn1.5O4 is only 56.1 mA h g−1. The significantly enhanced D Li + and the enlarged electronic conductivity make the Sn-doped spinel LiNi0.5Mn1.5O4 material present even more excellent electrochemical performances. These results reveal that Sn-doping is an effective way to improve electrochemical performances of LiNi0.5Mn1.5O4.
摘要
本文采用两步烧结高温固相法成功制备了锡掺杂LiNi0.5Mn1.5−x Sn x O4 (0 ≤ x ≤ 0.1)锂离子电池正极材料. x为0.02时, LiNi0.5Mn1.48Sn0.02O4的比容量和循环性能最好. 室温下, 在3.5–4.9 V电压范围内, 0.1 C放电倍率, LiNi0.5Mn1.48Sn0.02O4的首次放电比容量为117 mA h g−1, 而没有锡掺杂的LiNi0.5Mn1.5O4只有101 mA h g−1. 此外, 1 C放电100个循环后, 所有锡掺杂后的LiNi0.5Mn1.5O4材料均保持了较高的放电比容量; 尤其是LiNi0.5Mn1.48Sn0.02O4, 100个循环后, 放电比容量为90 mA h g−1, 而纯的LiNi0.5Mn1.5O4, 100个循环后其放电比容量仅为56.1 mA h g−1. 锡掺杂后的LiNi0.5Mn1.48Sn0.02O4材料具有比LiNi0.5Mn1.5O4材料及其他组材料更高的锂离子扩散效率, Sn离子的掺杂有利于锂离子的扩散和导电性的提高, 从而提高了LiNi0.5Mn1.5O4的电化学性能. 因此锡掺杂是一种有效的改善高电压锂离子电池材料LiNi0.5Mn1.5O4电化学性能的方法.
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Acknowledgments
This work was supported by the Science and Technology Program of WeiHai (2015DXGJMS017), and HIT & Yun Shan Group Research and Development on Graphite Area.
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Jingmin Hao is currently a graduate student majored in electrochemistry at the School ofMarine Science and Technology, Harbin Institute of Technology,Weihai. Her research interest includes tuning themorphology of LiNi0.5Mn1.5O4 to optimize its electrochemical properties.
Haiping Liu received her BSc degree in chemical engineering fromQiluUniversity of Technology in 1998, and her MSc and PhD degrees in chemical engineering and technology in 2004 and 2008, respectively, from Harbin Institute of Technology. Then, she joinedHarbin Institute of Technology,Weihai as a faculty and became an associate professor of applied chemistry in 2013. Her research interests include electrodeposition, surface finishing, electrode materials, and graphene composite materials for Li-ion batteries.
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Hao, J., Liu, H., Ji, Y. et al. Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries. Sci. China Mater. 60, 315–323 (2017). https://doi.org/10.1007/s40843-016-5166-0
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DOI: https://doi.org/10.1007/s40843-016-5166-0