Degradation mechanism and performance enhancement strategies of LiNixCoyAl 1 −x−yO 2 ( x ≥ 0.8) cathodes for rechargeable lithium-ion batteries: a review

未分类

A b s t r a c t

Nonetheless, the structural and interfacial instability leads to their poor cyclability and inferior thermal stability, which needs to be urgently addressed prior to their further practical applications.

それにもかかわらず、構造的および界面の不安定性は、それらの不十分なサイクル性および劣った熱安定性につながり、それらのさらなる実用化の前に緊急に対処する必要がある。

In this review, we give a brief introduction about the degradation mechanism of layered NCA cathodes during charge-discharge processes and summarize proposed performance enhancement strategies, which may contribute to provide important ideas to design and construct integrated layered NCA cathodes for high-energy density battery

このレビューでは、充放電プロセス中の層状NCAカソードの劣化メカニズムについて簡単に紹介し、提案された性能向上戦略を要約します。これは、高エネルギー密度電池用の統合層状NCAカソードを設計および構築するための重要なアイデアを提供するのに役立つ可能性があります。

However, the NCA cathodes simultaneously suffer from the unacceptable performance fading during cycles, which can be partly ascribed to the thermodynamic instability in the full state of charge and partly to the residual lithium compounds with strong alkalinity originated from the synthesis and storage processes →ref [54 – 57].

ただし、NCAカソードは、サイクル中の許容できない性能低下に同時に悩まされます。これは、完全な充電状態での熱力学的不安定性と、に起因する強いアルカリ性を持つ残留リチウム化合物に一部起因する可能性があります。 合成および保管プロセス

in which thesurface coating and ion doping modification effectively mitigate these problems
→ref [58 – 61].
the coating materials can clear up the residual lithium compounds on the surface of the cathodes as well as partially doping into the surface-near lattice to modify the structure of the cathode materials
→ref [65, 66]

The origins of the unacceptable performance deterioration of the NCA cathodes primarily include cationic mixing, phase transition, residual lithium compounds, and microcracks, etc.

NCAカソードの許容できない性能低下の原因には、主にカチオン混合、相転移、残留リチウム化合物、マイクロクラックなどがあります