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Effects of Surface Contaminants Inherited from Lithium Sources on the Electrochemical Performance of High-Nickel

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Summary
This summary is machine-generated.

Residual lithium carbonate impurities in lithium sources significantly impact ultrahigh-nickel NCM battery performance. Lowering these impurities promotes a protective surface film, enhancing battery stability and longevity.

Keywords:
crosstalkhigh-nickel positive electrodelithium sourcelithium-ion batteriesresidual lithium compoundsurface work function

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Ultrahigh-nickel Li[NixCoyMnz]O2 (NCM) cathode materials are crucial for high-energy-density lithium-ion batteries.
  • Residual lithium compounds, particularly lithium carbonate (Li2CO3), persist in NCM materials due to calcination limitations.
  • The Li2CO3 content in the lithium source influences the formation of a protective surface film on NCM cathodes.

Purpose of the Study:

  • To investigate the impact of residual lithium compounds from different lithium sources on the electrochemical performance and degradation mechanisms of ultrahigh-Ni NCM materials.
  • To elucidate the role of Li2CO3 impurity levels in the formation of cathode surface films and subsequent battery degradation.

Main Methods:

  • Synthesis of ultrahigh-Ni NCM materials using lithium hydroxide monohydrate and anhydrous lithium hydroxide with varying Li2CO3 impurity levels.
  • Electrochemical cycling and characterization of NCM electrodes to evaluate performance and degradation.
  • Analysis of electrode surface morphology and electrolyte decomposition products.

Main Results:

  • NCM materials synthesized from Li sources with higher Li2CO3 content exhibited limited surface film formation, leading to accelerated electrolyte decomposition, structural degradation, and transition-metal dissolution.
  • These materials showed destabilization of the negative electrode due to repeated solid electrolyte interphase (SEI) damage and reconstruction.
  • Conversely, NCM prepared from Li sources with lower Li2CO3 content formed a protective surface film, suppressing degradation and improving cycling stability.

Conclusions:

  • The residual Li2CO3 content in the lithium source is a critical factor determining the dominant degradation pathway in ultrahigh-Ni NCM materials.
  • Controlling Li2CO3 impurities in the Li source is essential for enhancing the performance and cycle life of high-energy-density lithium-ion batteries.