Spontaneous Strain Buffer Enables Superior Cycling Stability in Single-Crystal Nickel-Rich NCM Cathode

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

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Author(s)

  • He Zhu
  • Kamila M. Wiaderek
  • Olaf J. Borkiewicz
  • Jian Zhang
  • Longlong Fan
  • Cheng Chao Li
  • Qi Liu

Detail(s)

Original languageEnglish
Pages (from-to)9997–10005
Journal / PublicationNano Letters
Volume21
Issue number23
Online published23 Nov 2021
Publication statusPublished - 8 Dec 2021

Abstract

The capacity degredation in layered Ni-rich LiNixCoyMnzO2 (x ≥ 0.8) cathode largely originated from drastic surface reactions and intergranular cracks in polycrystalline particles. Herein, we report a highly stable single-crystal LiNi0.83Co0.12Mn0.05O2 cathode material, which can deliver a high specific capacity (∼209 mAh g-1 at 0.1 C, 2.8-4.3 V) and meanwhile display excellent cycling stability (>96% retention for 100 cycles and >93% for 200 cycles). By a combination of in situ X-ray diffraction and in situ pair distribution function analysis, an intermediate monoclinic distortion and irregular H3 stack are revealed in the single crystals upon charging-discharging processes. These structural changes might be driven by unique Li-intercalation kinetics in single crystals, which enables an additional strain buffer to reduce the cracks and thereby ensure the high cycling stability.

Research Area(s)

  • in situ synchrotron characterization, local structure dynamics, Ni-rich cathode material, single-crystal cathode

Citation Format(s)

Spontaneous Strain Buffer Enables Superior Cycling Stability in Single-Crystal Nickel-Rich NCM Cathode. / Zhu, He; Tang, Yu; Wiaderek, Kamila M.; Borkiewicz, Olaf J.; Ren, Yang; Zhang, Jian; Ren, Jincan; Fan, Longlong; Li, Cheng Chao; Li, Danfeng; Wang, Xun-Li; Liu, Qi.

In: Nano Letters, Vol. 21, No. 23, 08.12.2021, p. 9997–10005.

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