Structure and Charge Regulation Strategy Enabling Superior Cyclability for Ni-Rich Layered Cathode Materials

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Huan Zhao
  • Jinling Zhao
  • Xueling Shen
  • Xiaodan Wang
  • Ze Wang
  • Chuanlei Qi
  • Wei Xiao
  • Lei Yao
  • Jiantao Wang
  • Weidong Zhuang
  • Xueliang Sun

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2104282
Journal / PublicationSmall
Publication statusOnline published - 8 Oct 2021

Abstract

Ni-rich layered oxides are significantly promising cathode materials for commercial high-energy-density lithium-ion batteries. However, their major bottlenecks limiting their widespread applications are capacity fading and safety concerns caused by their inherently unstable crystal structure and highly reactive surface. Herein, surface structure and bulk charge regulation are concurrently achieved by introducing high-valence Ta5+ ions in Ni-rich cathodes, which exhibit superior electrochemical properties and thermal stability, especially a remarkable cyclic stability with a capacity retention of 80% for up to 768 cycles at a 1C rate versus Li/Li+. Due to the partial Ta enrichment on surface, the regulated surface enables high reversibility of Li+ insertion/extraction by preventing surface Ni reduction in deep charging. Moreover, bulk charge regulation that boosts charge density and its localization on oxygen remarkably suppresses microcracks and oxygen loss, which in turn prevents the fragmentation of the regulated surface and structural degradation associated with oxygen skeleton. This study highlights the significance of an integrated optimization strategy for Ni-rich cathodes and, as a case study, provides a novel and deep insights into the underlying mechanisms of high-valence ions substitution of Ni-rich layered cathodes.

Research Area(s)

  • charge regulation, lithium-ion batteries, Ni-rich layered cathode materials, surface structure regulation, Ta enrichment, LI-ION BATTERIES, TRANSITION-METALS, OXIDE CATHODE, LITHIUM, PERFORMANCE

Citation Format(s)

Structure and Charge Regulation Strategy Enabling Superior Cyclability for Ni-Rich Layered Cathode Materials. / Huang, Wei; Li, Wenjin; Wang, Lve; Zhu, He; Gao, Min; Zhao, Huan; Zhao, Jinling; Shen, Xueling; Wang, Xiaodan; Wang, Ze; Qi, Chuanlei; Xiao, Wei; Yao, Lei; Wang, Jiantao; Zhuang, Weidong; Sun, Xueliang.

In: Small, 08.10.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review