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Manganese-Based Spinel Cathodes: A Promising Frontier for Solid-State Lithium-Ion Batteries.

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All-solid-state lithium-ion batteries (ASSLIBs) show promise for safer, denser energy storage. Manganese-based spinel cathodes (LMO/LNMO) face challenges like degradation and poor electrolyte compatibility, hindering ASSLIB development.

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characterizationmanganesesolid‐state batteriessolid‐state electrolytesspinel cathode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium-ion batteries (ASSLIBs) offer enhanced safety and energy density over conventional lithium-ion batteries (LIBs).
  • Manganese-based spinel cathodes, such as LiMn2O4 (LMO) and LiNi0.5Mn1.5O4 (LNMO), are cost-effective and structurally stable with 3D Li-ion diffusion channels, showing potential for ASSLIBs.
  • Despite their advantages, LMO and LNMO face challenges including structural degradation, poor interfacial contact, high interfacial resistance, and Mn dissolution, limiting their practical application in ASSLIBs.

Purpose of the Study:

  • To explore the spinel structure, electrochemical behavior, and degradation mechanisms of LMO and LNMO cathodes.
  • To review and introduce mitigating strategies for challenges encountered when pairing LMO/LNMO with various solid-state electrolytes (SSEs).
  • To discuss future research directions for advancing Mn-based spinel cathodes for next-generation ASSLIBs.

Main Methods:

  • Exploration of spinel structure, electrochemical performance, and degradation pathways of LMO/LNMO.
  • Review of recent advancements in solid-state electrolytes (SSEs) including polymer-, oxide-, composite-, sulfide-, halide-, and LiPON-based systems.
  • Analysis of compatibility and interfacial issues between Mn-based spinel cathodes and diverse SSEs.

Main Results:

  • LMO and LNMO exhibit potential for ASSLIBs due to their low cost and structural stability.
  • Significant challenges remain, including structural degradation, interfacial resistance, and electrochemical incompatibility with certain SSEs, particularly for high-voltage LNMO.
  • Various SSEs, including polymer, oxide, composite, sulfide, halide, and LiPON, have been investigated for compatibility with LMO/LNMO.

Conclusions:

  • Mn-based spinel cathodes (LMO/LNMO) are promising but require strategies to overcome degradation and interfacial challenges for ASSLIBs.
  • Addressing the electrochemical incompatibility between high-voltage LNMO and SSEs is crucial for practical application.
  • Future research should focus on developing robust Mn-based spinel cathodes and compatible SSEs to realize the full potential of next-generation ASSLIBs.