Construction of Novel Transition-metal Oxide Nanostructures and Their Composites as Anodes for High-performance Lithium Ion Batteries

構建基於新型過渡金屬氧化物納米結構及其複合材料的高性能鋰離子電池陽極材料

Student thesis: Doctoral Thesis

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Author(s)

  • Qiaobao ZHANG

Detail(s)

Awarding Institution
Supervisors/Advisors
Award date26 Jul 2016

Abstract

The focus of this thesis concerns the development of alternative anode materials with improved electrochemical performances for lithium ion batteries (LIBs) to meet the boosting demand for high-performance. Given their many advantages such as high specific capacity, the ease of large-scale fabrication and great flexibility in structures and morphology, nanostructured transition metal oxides (NTMOs) have been regarded as promising alternative anode materials substituted for current commercialized graphitic material for high-performance LIBs. Considering their intrinsic poor conductivity and poor structural stability, which might fail to sustain large volume changes, scrupulous design and fabrication of well-defined selfsupported NTMOs architectures growing directly on conductive substrates or smart combination them with carbon-based materials to form composites is therefore a prerequisite for optimizing the electrochemical performance.

Several types of self-supported new NTMOs including 1D CuO nanowires, 2D Co3O4 nansoheets, 1D NiCo2O4 nanoneedles, 2D CoO nanosheets, 2D Zn-Ni-Co oxide (ZNCO) nanosheets and their corresponding 3D branched core/shell heterostructures prepared by facile, controllable and powerful solution strategy combined with a post annealing treatment are studied in this dissertation, with the aim of superior electrochemical performances in terms of high rate capability, large reversible capacity and excellent cycle performance. Moreover, to improve the electrochemical performance of off-substrate TMOs micro/nanostructures constructed from porous nano-building blocks as anode in LIBs, 3D hierarchical porous ZNCO microspheres constructed from porous ultrathin nanosheets well encapsulated by graphene sheets (GNS) are constructed and further investigated as anodes for LIBs in this dissertation.