Dalian Institute of Chemical Research Wu Zhongshuai AFM: MXene-based high-performance metal ion battery nanostructure research progress and prospects

source：beike new material Views：3222time：2020-08-10 QQ Academic Group: 1092348845

Guide

MXenes are a large class of two-dimensional transition metal carbides or carbonitrides. In recent years, researchers have built advanced MXene-based nanostructures for different types of energy density and power density metal ion batteries (mib). This article summarizes the research progress of MXene-based nanostructures in high-performance MIBs from lithium-ion batteries to non-lithium-ion batteries in recent years, highlighting the unique role of MXene as an active material, conductive substrate or even current collector, as well as The synergistic effect and strong interaction between the interfaces, and briefly discuss the challenges and prospects of mxene nanostructures in terms of MIBs.

Background Brief

1. What is a non-lithium metal ion battery

Electrochemical energy storage devices (EESDs) can store renewable energy sources into electrochemical energy sources, provide green alternative energy sources for electricity use, and ultimately ease the rapid consumption of fossil fuels and reduce environmental pollution. Lithium-ion batteries (LIBs) have a higher energy density than supercapacitors. However, with the increase in lithium prices, LIBs may not be able to fully meet the future high-performance electric vehicles and large-capacity energy storage (such as power plants). The demand for power density. At the same time, non-lithium metal ion batteries (mib) based on other alkali metals (Na, K) and polyvalent metals (Zn, Mg, Ca) have also attracted widespread attention.

In recent years, new mib batteries (such as sodium ion batteries (SIBs), potassium ion batteries (PIBs), and zinc ion batteries (ZIBs)) with high theoretical capacities (such as Si or lithium anodes and lithium-rich anodes) and high operating voltages have been used as Alternative technologies for lithium-ion batteries have been developed for low-cost and high-security applications. When the charge and discharge cycles are repeated in various MIBs, in order to meet the requirements of ideal electron / ion conduction and stable structural integrity, the electrode materials are further required to have suitable physicochemical properties and excellent electrochemical performance. However, there is currently no electrode material that can fully meet these requirements.

2. What is MXenes material?

MXenes, as a broad class of two-dimensional transition metal carbides or carbonitrides, has aroused special research interest in energy-related fields. MXenes are mainly prepared by selectively etching the "a" layer of the layered ternary MAX precursor with a mixed solution of hydrofluoric acid or hydrochloric acid and lithium fluoride, where M, a, and X represent early transition metals (for example, Ti, Nb, V, Mo), group III-VI elements (eg Al, Si, ga) and C and / or N. The chemical composition of MXenes is usually defined as M n + 1 X n T x (n = 1-3), where T x refers to the surface end groups generated during the corrosion process.

The results show that MXene is a two-dimensional layered material with high conductivity. Due to its hydrophilic surface, it has excellent dispersibility in aqueous solutions. Thanks to this unique feature, 2D MXene nanosheets are often used to build advanced nanostructures for different EESDs, such as supercapacitors (SCs), LIBs and non-lithium MIBs. Although there have been several review reports on the synthesis and application of MXene in energy storage devices, it is mainly focused on lithium-sulfur batteries, and there is currently a lack of lithium-sulfur batteries and non-lithium ion batteries (such as Na ⁺ , K ⁺ , Zn ²⁺ , Mg ²⁺ , Ca ²⁺ ) comprehensive and timely review of MXene-based mib, but also lack of effective MXene-based electrode structure design principles.

Figure 1. Schematic diagram of MXene-based nanostructures.

Article Introduction

Recently, the Chinese Academy of Wuzhong handsome and others well-known in the International Journal of Advanced F unctional Materials (2018 impact factor: 15.62 ) entitled "On Recent in Advances and Promise of MXene-Based Nanostructures for High-Performance Metal the Ion Batteries " progress report. The first author of this article is Yanfeng Dong .
The author reviewed the latest progress of MXene-based materials in different MIBs, and emphasized the important achievements of MXene-based materials in different MIBs. From the common LIB to the emerging SIB, PIB, ZIBs, magnesium ion batteries (MgIBs) and calcium ion batteries (CIB), the unique role of MXene nanosheets as active materials, current collectors, conductive additives, the second Uygur Support conducted an organic summary. On this basis, several typical structural models are proposed, and their advantages in promoting rapid ion diffusion and rapid electron transport, as well as improving electrode structure and hybrid interface stability are systematically compared. Finally, the future development direction of MIBs based on mxene is prospected.

Figure 2. Schematic diagram of electrochemical performance and structure

a) Specific capacity and cyclability tested at the different rates of 1 C and 10 C for Nb2C, V2C, and Ti2C. Reproduced with permission.

b) Valence electron localization function of Ti3C2O2Li2 with or without an extra Li layer. Reproduced with permission.

c) Schematic illustration for the preparation of M′2M ″ C2 / M′2M ″ 2C3 MXene structures.

d) Cycling stability of Mo2TiC2 obtained at C / 10 and 1 C rates.

Article link: https://onlinelibrary.wiley.com/doi/10.1002/adfm.202000706

Source of information: Scientific Materials Station

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