纳米Al2O3包覆富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2的性能研究

Translated title of the contribution: Nano-Al2O3 Coated Li-rich Cathode Material Li1. 2Ni0.13Co0.13Mn0.54O2 for Highly Improved Lithium-ion Batteries

Liangdan Chen, Wei Zou, Liang Wu, Fanjie Xia, Zhiyi Hu, Yu Li, Baolian Su

Research output: Contribution to journalArticlepeer-review

Abstract

The lithium-rich cathode material Li1.2Ni0.13Co0.13Mn0.54O2 were coated uniformly by nano-Al2O3 for highly stable lithium-ion batteries. The optimum content of nano-Al2O3 coating on the structure, surface morphology and electrochemical properties were systematically studied by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). SEM and TEM results show that the surface of the lithium-rich cathode material is evenly coated with nano-Al2O3. XRD results show that the as-synthesized materials have a layered structure. Electrochemical test results show that the nano-Al2O3 coating is beneficial to improving the discharge specific capacity, rate performance and cycle stability. The nano-Al2O3 coated Li1.2Ni0.13Co0.13Mn0.54O2 material has a specific discharge capacity of 249. 7 mA•h/g with excellent cycling stability(89.5% capacity retention after 100 cycles). Cyclic voltammetry(CV) and electrochemical impedance(EIS) results show that nano-Al2O3 coating can effectively inhibit the erosion of HF, reduce electrode material/electrolyte interface side-reactions, decrease polarization, reduce interface impedance and charge transfer impedance. This work suggests that the nano-Al2O3 coating is an effective route to significantly improve the electrochemical performance of lithium-rich cathode materials.

Translated title of the contributionNano-Al2O3 Coated Li-rich Cathode Material Li1. 2Ni0.13Co0.13Mn0.54O2 for Highly Improved Lithium-ion Batteries
Original languageChinese
Pages (from-to)1329-1336
Number of pages8
JournalGaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
Volume41
Issue number6
DOIs
Publication statusPublished - 10 Jun 2020

Keywords

  • LiNiCoMnO
  • Lithium-ion battery
  • Nanometer aluminum trioxide
  • Surface modification

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