Structural Transformation of Li-Excess Cathode Materials via Facile Preparation and Assembly of Sonication-Induced Colloidal Nanocrystals for Enhanced Lithium Storage Performance

Jianqing Zhao, Ruiming Huang, Pablo Ramos, Yiying Yue, Qinglin Wu, Michele Pavanello, Jieyu Zhou, Xiaoxiao Kuai, Lijun Gao, Huixin He, Ying Wang

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Abstract

A surfactant-free sonication-induced route is developed to facilely prepare colloidal nanocrystals of Li-excess layered Li1.2Mn0.54Ni0.13Co0.13O2 (marked as LMNCO) material. The sonication process plays a critical role in forming LMNCO nanocrystals in ethanol (ethanol molecules marked as EtOHs) and inducing the interaction between LMNCO and solvent molecules. The formation mechanism of LMNCO-EtOH supramolecules in the colloidal dispersion system is proposed and examined by the theoretical simulation and light scattering technique. It is suggested that the as-formed supramolecule is composed of numerous ethanol molecules capping the surface of the LMNCO nanocrystal core via hydrogen bonding. Such chemisorption gives rise to dielectric polarization of the absorbed ethanol molecules, resulting in a negative surface charge of LMNCO colloids. The self-assembly behaviors of colloidal LMNCO nanocrystals are then tentatively investigated by tuning the solvent evaporation condition, which results in diverse superstructures of LMNCO materials after the evaporation of ethanol. The reassembled LMNCO architectures exhibit remarkably improved capacity and cyclability in comparison with the original LMNCO particles, demonstrating a very promising cathode material for high-energy lithium-ion batteries. This work thus provides new insights into the formation and self-assembly of multiple-element complex inorganic colloids in common and surfactant-free solvents for enhanced performance in device applications.

Original languageEnglish (US)
Pages (from-to)31181-31191
Number of pages11
JournalACS Applied Materials and Interfaces
Volume9
Issue number36
DOIs
Publication statusPublished - Sep 13 2017

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • Li-excess layered cathode
  • colloidal nanocrystal
  • lithium-ion battery
  • nanostructured electrode material
  • sonication-induced approach

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