Sol/Antisolvent Coating for High Initial Coulombic Efficiency and Ultra-stable Mechanical Integrity of Ni-Rich Cathode Materials

Xiaoqing Zhang, Jianwei Xiong, Fengzhen Chang, Zhuijun Xu, Zheng Wang, Philip Hall, Ya Jun Cheng, Yonggao Xia

Research output: Journal PublicationArticlepeer-review

Abstract

The Ni-rich cathode holds great promise for high energy density lithium-ion batteries because of its high capacity and operating voltage. However, crucial problems such as cation disorder, structural degradation, side reactions, and microcracks become serious with increasing nickel content. Herein, a novel and facile sol/antisolvent coating modification of Ni-rich layered oxide LiNi0.85Co0.1Mn0.05O2(NCM) is developed where we use ethanol to disperse the nanosized LiBO2to form the sol and adopt tetrahydrofuran (THF) as antisolvent to prepare the cluster of nanoparticles to be coated on the surface of NCM. The coating thickness can be tuned through the THF addition amount. The LiBO2nanorod deposition is formed as well over the crack of the NCM cathode, likely acting as a patch to repair the original defect of the intrinsic crack. The uniform LiBO2nanospherical particle coating together with LiBO2nanorod wrapping provides a double protection against electrolytes. Compared with the raw material, LiBO2-coated LiNi0.85Co0.1Mn0.05O2(LiBO2-coated NCM) exhibits a high initial Coulombic efficiency of 90.3% at 0.2 C between 2.8 and 4.3 V vs Li+/Li, a superior rate capability, enhanced fast charge property at 3 C, and restricted microcrack formation. This simple in-site modification and repairing technology guarantees a good mechanical integrity of the polycrystalline Ni-rich cathode.

Original languageEnglish
Pages (from-to)45272-45288
Number of pages17
JournalACS applied materials & interfaces
Volume14
Issue number40
DOIs
Publication statusPublished - 12 Oct 2022

Keywords

  • crystalline LiBOpassive coating
  • initial Coulombic efficiency
  • mechanical integrity
  • polycrystalline Ni-rich cathode
  • sol/antisolvent method

ASJC Scopus subject areas

  • Materials Science (all)

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