Two-Dimensional Ga₂O₃/C Nanosheets as Durable and High-Rate Anode Material for Lithium Ion Batteries

Abstract

The self-healing feature of gallium (Ga) is unique, making Ga-based materials attract attention for their potential to solve the anode pulverization issue of lithium ion batteries. In this work, a hierarchical two-dimensional (2D) Ga 2 O 3 /C structure has been synthesized by a facile NaCl template method. Ga 2 O 3 nanoparticles (3.8 nm) are uniformly embedded in 2D carbon nanosheets. The long horizontal length of the carbon nanosheets (10 μm) provides longrange electron conductivity, and the thin vertical thickness (75 nm) shortens the Li ion diffusion path. Benefited from the integrated 2D structure and the high electron conductivity, the obtained 2D Ga 2 O 3 /C nanosheets exhibit excellent overall performance, including high lithium storage capacity (1026 mAh g −1 at 0.5 A g −1 ), high rate capability (378 mAh g −1 at 10.0 A g −1 ), and high cyclability (500 cycles at 0.5 A g −1 ). The lithiation/delithiation mechanism of 2D Ga 2 O 3 /C has been further studied with combined electrochemical and ex situ Xray diffraction methods.

Scalable Synthesis of Ga2O3/N‐Doped C Nanopapers as High‐Rate Performance Anode for Li‐Ion Batteries

“…The rate performance of the Ga 2 O 3 /NC NPs‐1 is distinctly improved compared with previous study (Table 1). [8,15,17,23,24,46] …”

“…However, as power supply for the coming electric vehicles, it is still urgent to improve the energy density and safety performance of LIBs. One possible approach to address above problem is searching advanced materials with higher specific capacity and appropriate working potential [5–9] …”

Chemical composition tuning induced variable and enhanced dielectric properties of polycrystalline Ga2‐2xWxO3 ceramics

“…Recent reports on the enhanced performance of Ga 2 O 3 ‐graphene oxide hybrid nanomaterials is a typical example that exemplifies the possibility to design new electrode materials based on Ga 2 O 3 for novel electrochemical energy technologies 33,34 . Furthermore, it is proven that tailored composites, where an oxide combined with graphene sheets, causes extrinsic defects and more active sites, both resulting in the lithiation and anode stability 34‐36 . Such recently discovered new phenomena assures the possibility of the design and development of novel electrode materials based on Ga 2 O 3 and its composites.…”

“…33,34 Furthermore, it is proven that tailored composites, where an oxide combined with graphene sheets, causes extrinsic defects and more active sites, both resulting in the lithiation and anode stability. [34][35][36] Such recently discovered new phenomena assures the possibility of the design and development of novel electrode materials based on Ga 2 O 3 and its composites. Due to a wide range of applications in power electronic devices and optoelectronics related technologies, a large amount of work has been devoted to the study of the optoelectronic and dielectric properties of both intrinsic and doped Ga 2 O 3 materials.…”

In Situ Reinforcing: ZrO2-Armored Hybrid Polyimide Separators for Advanced and Safe Lithium-Ion Batteries

“…Electrochemical energy storage devices have driven the progress of portable electronics and electric vehicle applications. − Lithium-ion batteries (LIBs) have been deemed as the most encouraging power source for utility storage, portable electronic devices, and electric vehicles owing to their high capacity, safety, and stable recycling time. − Separator, as a key component of LIBs to isolate the positive and negative electrodes, possesses the significant function of transmitting Li ions and accommodating the liquid electrolyte, − simultaneously needs to possess superior performance under abnormal conditions, such as high temperature and harsh compression, for meeting special applications. − To date, polyolefin porous membranes as commercial separators, including polyolefin single-layer membrane and multilayer membrane, still dominate the separator market on account of chemical resistance, good mechanical strength, and low cost. , Unfortunately, the inferior thermomechanical stability, wetting property, and low porosity of polyolefin-type membranes significantly impede LIB performance, − which can affect the security and electrochemical performance of the battery. , To address the aforementioned issues, numerous strategies have been employed to enhance the polyolefin-based separator, covering the introduction of inorganic nanoparticles and heat-resistant materials. − To a certain degree, although these strategies contribute to promoting the thermomechanical stability and wettability associated with polyolefin separators, the inherent thermostability of the commercial polyolefin membrane still limits the advancement of LIBs. Consequently, a new-generation separator with high performance is still lacking to date, driving the progress of advanced LIBs.…”