Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220157.doi: 10.7503/cjcu20220157

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Lithium Storage Performance of Pseudocapacitance-controlled Perovskite High-entropy Oxide La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 Anode Materials

JIA Yanggang, SHAO Xia, CHENG Jie, WANG Pengpeng, MAO Aiqin()   

  1. School of Materials Science and Engineering,Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan 243032,China
  • Received:2022-03-15 Online:2022-08-10 Published:2022-05-06
  • Contact: MAO Aiqin E-mail:maoaiqinmaq@163.com
  • Supported by:
    the Natural Science Foundation of Anhui Province, China(2008085ME125);the University Natural Science Research Project of Anhui Province, China(KJ2020A0268);the Director's Fund of Key Laboratory of Green Fabrication and Surface Technology of Advance Metal Materials, Ministry of Education, China(GFST2022ZR08)

Abstract:

La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 high-entropy oxide(HEO) was prepared by co-precipitation using metal nitrate as the metal source, NaOH and Na2CO3 as the precipitant and explored as a novel anode active material for lithium-ion batteries(LIBs). The microstructure and electrochemical properties of as-synthesized La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 HEO were investigated and also compared with conventional LaCoO3. Scanning electron microscopy(SEM), X-ray diffraction(XRD) and N2 adsorption/desorption tests showed that the as-prepared La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 HEO was a single-phase perovskite structure, and spherical shape with chemical and microstructural homogeneity, and high specific surface area(19.83 m2/g). As compared to conventional LaCoO3, the La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 anode material not only provides the higher specific capacity, but also exhibits excellent rate performance and cycling stability. The initial discharge specific capacity of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 anode is 855.8 mA·h/g at the current density of 200 mA/g, and after 150 cycles, the specific capacity increases to 771.8 mA·h/g, which is much higher than the theoretical capacity(331.6 mA·h/g). It is worth noting that La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 anode delivers the specific capacitity of 320 mA·h/g at 3000 mA/g with a capacity retention rate of 95.1% after 500 cycles, which is close to its theoretical capacity. The improved lithium storage performance of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 is mainly attributed to the entropy-stabilized crystal structure and the multiprincipal synergistic effect, resulting in the improved lithium ion diffusion coefficient(11.2×10-18 cm2/s) and pseudocapacitance contribution.

Key words: Lithium-ion battery, High entropy oxide, Perovskite structure, Anode material, Pseudocapacitance

CLC Number: 

TrendMD: