Analysis on Reaction and Degradation Mechanism for Mixed Composite Cathode in Lithium Ion Battery

リチウムイオン二次電池用混合正極の反応・劣化機構の解明

The mixed LiMn₂O₄-LiNi₁-ₓ-yCoₓMnyO₂ composite cathode in lithium ion battery during discharge process was studied with time resolve XRD and XAFS measurements in order to clarify the reaction and degradation mechanism of LiMn₂O₄ and LiNi₁-ₓ-yCoₓMnyO₂. The combination of the XRD and XAFS measurements successfully allowed the authors to understand each reaction for LiMn₂O₄ and LiNi₁-ₓ-yCoₓMnyO₂ in mixed composite cathode. Furthermore, the output of the cell with mixed composite cathode was faded by storage under high temperature condition and it was clarified that the factor of output fading was due to the decrease of reaction ratio for LiMn₂O₄ by reaction distribution.EV用リチウムイオン二次電池の混合正極の反応と劣化挙動を解明するために,放射光施設SPring-8において高時間分解のXRDとXAFS測定を行った.その結果,本手法を用いてLMOとNCMの分離解析が可能となり,混合正極の出力低下の要因がLMO の反応割合の低下であることを明らかにした.更に,LMO の反応割合の低下は,粒子表面近傍における変質相の厚みの分布により発生する反応分布が主要因と考えられた.

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  • Accession Number: 01670814
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:17PM