Lithium gallium oxide (LiGaO2): High-performance anode material for lithium-ion batteries

Abstract

The development of novel anodes is an effective method to improve advanced energy storage devices. In this work, a simple and easily scalable strategy is adopted to construct lithium gallium oxide (LiGaO2) via a facile solid-state reaction method. However, there are few reports on LiGaO2 for lithium-ion battery anodes. The well-designed LiGaO2 fabricated in this work is polycrystalline with a regular polygon shape consisting of fine particles. The lithiation strategy increases the electronic conductivity of LiGaO2 without further carbon coating. After 200 cycles at 0.1 A g−1, the LiGaO2 anode displays good reversible capacity. After 1000 cycles at 3.0 A g−1, the capacity retention is 253.3 mA h g−1. Electrochemical results show that this lithiation strategy can accelerate lithium-ion diffusion and charge transfer kinetics of the LiGaO2 anode and alleviate the pulverization of the electrochemical reaction. The ex situ XRD result confirms the good structural stability of the LiGaO2 anode. This study demonstrates the necessity of developing new anode materials with good cycling stability via this lithiation strategy.