Enhancing the Storage Performance and Thermal Stability of Ni-Rich Layered Cathodes by Introducing Li 2 MnO 3

Jun Yang (), Pingping Yang and Hongyu Wang
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Jun Yang: Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Pingping Yang: Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Hongyu Wang: Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai University, Xining 810016, China

Energies, 2024, vol. 17, issue 4, 1-14

Abstract: Ni-rich layered cathodes are deemed as a potential candidate for high-energy-density lithium-ion batteries, but their high sensitivity to air during storage and poor thermal stability are a vital challenge for large-scale applications. In this paper, distinguished from the conventional surface modification and ion doping, an effective solid-solution strategy was proposed to strengthen the surface and structural stability of Ni-rich layered cathodes by introducing Li 2 MnO 3 . The structural analysis results indicate that the formation of Li 2 CO 3 inert layers on Ni-rich layered cathodes during storage in air is responsible for the increased electrode interfacial impedance, thereby leading to the severe deterioration of electrochemical performance. The introduction of Li 2 MnO 3 can reduce the surface reactivity of Ni-rich cathode materials, playing a certain suppression effect on the formation of surface Li 2 CO 3 layer and the deterioration of electrochemical performances. Additionally, the thermal analysis results show that the heat release of Ni-rich cathodes strongly depends on the charge of states, and Li 2 MnO 3 can suppress oxygen release and significantly enhance the thermal stability of Ni-rich layered cathodes. This work provides a method to improving the storage performance and thermal stability of Ni-rich cathode materials.

Keywords: lithium-ion batteries; Ni-rich cathode; storage performance; thermal stability; Li 2 MnO 3 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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