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Water-system sodium-ion battery electrode and preparation method and application thereof

A sodium-ion battery and electrode technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as poor cycle performance, structural collapse, and the impact of sodium ion migration, and achieve improved charge-discharge cycle performance and good hydrophilicity , improve the effect of circulation

Active Publication Date: 2019-05-10
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application process, there are still many challenges in the battery structure design and electrode matching of sodium-ion batteries.
[0006] At the same time, a major defect of aqueous sodium-ion batteries compared with lithium-ion batteries is that their cycle performance is poor. For transition metal oxide cathode materials, its structure is not fixed and stable; due to the large radius of sodium ions, Part of the structure will collapse during the intercalation process of sodium ions, which will affect the migration of sodium ions, especially for the layered structure, that is, O3. Therefore, a structurally stable aqueous sodium ion electrode has yet to be proposed.

Method used

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  • Water-system sodium-ion battery electrode and preparation method and application thereof
  • Water-system sodium-ion battery electrode and preparation method and application thereof
  • Water-system sodium-ion battery electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take Na 0.67 MnO 2 For the positive electrode material;

[0044] S1. Production of cathode material:

[0045] S11, the NaHCO 3 with Co3O 4 Mix at the ratio of chemical dosage ratio n(Na)=n(Co)=0.75:1, grind for 1 hour and then ball mill for 2 hours; then calcinate at 850°C and hold for 12 hours, and naturally crystallize to form black powder. The choice of high-temperature calcination temperature in this process is because the temperature has a great influence on the substance, and the Na content is slightly higher than the chemical formula because of the loss of part of the Na element in the high-temperature environment.

[0046] S12. Naturally cool the brown powder obtained above for 12 hours. At this time, a very hard black solid is obtained. After carefully grinding the positive electrode material, add a small amount of alcohol for wet grinding for 2 hours, and if the alcohol volatilizes during the wet grinding process, then Continue to add a small amount of al...

Embodiment 2

[0055] The difference from Example 1 is:

[0056] Take Na 0.44 MnO 2 For the positive electrode material;

[0057] S1. Production of cathode material:

[0058] S11, the Na 2 CO 3 with MnCO 3 The chemical dosage ratio n(Na)=n(Mn)=0.5:1 was ground for 1h, heated at 300°C for 8h, and then heated at 800°C for 9h, and black powder was obtained after natural crystallization. In this process, the Na content slightly higher than the chemical formula is to take into account the loss of part of the Na element in the high temperature environment.

[0059] S13, calcining the material obtained in step S12 in a high temperature environment of 850° C. for 24 to 36 hours (depending on the amount of one-time production), and crushing after natural crystallization to obtain a black solid, which is the positive electrode material obtained after high temperature calcination, and set aside;

[0060] S2, the dispersion of PTFE: according to the active substance (Na 0.67 CoO 2 ): conductive...

Embodiment 3

[0066] Carry out performance test to the product that embodiment one, implement two acquisitions:

[0067] The test environment is as follows

[0068] (1) Electrochemical workstation:

[0069] Electrochemical workstation is the abbreviation of electrochemical measurement system. It is a commonly used measuring equipment for electrochemical research and teaching. It is mainly used for electrochemical mechanism, biotechnology, qualitative and quantitative analysis of substances, conventional electrochemical testing, metal corrosion, batteries, etc. Research. The research group is equipped with Shanghai Chenhua CHI660C electrochemical workstation (CHI660C, Chenhua Ltd. Co., Shanghai, China). The operation interface of the workstation is clear and concise, the data analysis error is small, and it includes almost all common electrochemical testing techniques. The main test items in this experiment on this platform include cyclic voltammetry (CV, CyclicVoltammetry), AC impedance t...

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Abstract

The invention provides a preparation method of a water-system sodium-ion battery electrode. The preparation method comprises the following steps: S1, a cathode material is manufactured, specifically,a triturated cathode raw material is taken, ethyl alcohol is added into the triturated cathode raw material for grinding, the ground cathode raw material is calcined for 24-36 h at 800-950 DEG C, naturally crystallized and then smashed, and thus a black solid is obtained; S2, a concentrated dispersion emulsion with 60 wt% of PTFE is weighed with the proportion of the cathode material to a conductive agent to an adhesive being 5:1:1, then an absolute ethyl alcohol emulsion is added into the dispersion emulsion for ultrasonic treatment, and PTFE dispersion liquid is obtained when obvious milk white agglomerates cannot be observed by an electric torch, that is, the PTFE is dispersed; and S3, the electrode is prepared. The preparation method has the advantages that high-temperature calcinationis conducted in the electrode material preparation process to change stability of the electrode raw material structure, and thus the charge and discharge cyclicity of the electrode is remarkably improved; and meanwhile, the cyclicity of a non-battery biased capacitive material can be improved through the method similarly.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a water-based sodium ion battery electrode and a preparation method and application thereof. Background technique [0002] Energy production and storage technologies have attracted attention for a large number of everyday applications. With the application of lithium-ion batteries, its disadvantages such as insufficient resources and high cost have gradually emerged, prompting researchers to assemble sodium-ion batteries using the resource-rich sodium element. LIBS are used in most mobile electronic devices as well as in zero-emission electronic vehicles. However, for load leveling of renewable energy and smart grids, and sustainability of lithium resources, price increases are expected due to their limited availability. Therefore, it remains unclear whether LIBS alone can meet the growing demand for small-, medium-, and large-format energy storage applications. [0003] To ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/505H01M4/525H01M4/62H01M10/36H01M4/02
CPCY02E60/10
Inventor 黄宋奕杨昌平平俊肖海波王瑞龙黄秋安梁世恒
Owner HUBEI UNIV