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Ionics

, Volume 25, Issue 6, pp 2459–2468 | Cite as

Design of synergistic-coated layer of La2O3/Al2O3 in LiNi0.5Mn1.5O4 cathode for enhanced cycling stability and rate capability

  • Yi Han
  • Yuan Xue
  • Yun-Fei Xia
  • Jian-Ning Zhang
  • Fu-Da Yu
  • Da-Ming GuEmail author
  • Zhen-Bo WangEmail author
Original Paper
  • 91 Downloads

Abstract

LiNi0.5Mn1.5O4(LNMO) material has high theoretical capacity and high operating voltage. Nonetheless, LNMO has still many problems which include oxidative decomposition of electrolyte at high voltage and dissolution of transition metals into electrolyte. In this work, oxides of both La and Al (LAO) were coated on the surface LNMO by a wet chemical method. LAO is estimated to improve cycling performance (both room and elevated temperatures) and rate capability of LNMO due to the synergistic effect of La2O3 and Al2O3. Al2O3 can protect LNMO from the corrosion of HF that derives from decomposition of LiPF6, which results in mitigating the solution of Mn2+. Al2O3 can also prompt electrochemical reversibility of LNMO. La2O3 can enhance electrical conductivity, availing to charge transfer. Furthermore, La2O3 presents splendid thermal stability, which may boost the interfacial stability of LNMO. La2O3 can also alleviate the formation of the passive layer. The effect of coating content on performances of LNMO was also studied in detail. The capacity retention of 94.0% for the optimal coating LNMO with 4.0 wt.% (mLa2O3/mAl2O3 = 3: 1) is shown at 1 C and 25 °C after 200 cycles, and its capacity retention of 95.0% is exhibited at 1 C and 55 °C after 100 cycles. Its remarkable discharge capacities at 10, 15, and 20 C are 107.4, 94.4, and 82.7 mAh g−1, respectively, and its capacity retention of 93.3% is displayed at 5 C at room temperature after 500 cycles.

Keywords

Li-ion batteries LiNi0.5Mn1.5O4 Cycling stability Rate capability 

Notes

Funding information

We acknowledge the National Natural Science Foundation of China (Grant No. 21273058 and 21673064), China postdoctoral science foundation (Grant No. 2017M621285 and 2018T110292), and Harbin technological achievements transformation projects (2016DB4AG023) for their financial support.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Harbin Boerter Energy Technology Co., Ltd.HarbinChina

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