Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of polydopamine-coated sodium ion battery positive electrode material

A technology for sodium ion batteries and positive electrode materials, which is applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor integrity of coating materials, excess gas discharge, and impact on conductivity, etc., to improve cycle performance, coating Thin layer and good consistency

Pending Publication Date: 2022-03-18
南通金通储能动力新材料有限公司
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the coating layer mostly adopts inactive oxides, which can effectively reduce the sensitivity of the surface of the active material, but it will affect the overall conductivity of the material and the integrity of the coating material is poor.
In order to reduce the impact on conductivity, carbon material coating can be used to increase the surface inertness of active materials. The preparation method is generally to use organic matter coating and then burn in an inert gas, which will lead to energy waste, cost increase and excess gas discharge. question

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of polydopamine-coated sodium ion battery positive electrode material
  • Preparation method of polydopamine-coated sodium ion battery positive electrode material
  • Preparation method of polydopamine-coated sodium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of a polydopamine-coated sodium ion battery positive electrode material, comprising:

[0048] Step 1, using a high-speed mixer, the general formula synthesized by the co-precipitation method is Ni 1 / 3 Fe 1 / 3 mn 1 / 3 (OH) 2 The precursor and sodium carbonate were mixed at a molar ratio of 1:1.05, kept in a muffle furnace at 1000°C for 15 hours, the heating rate was 5°C / min, cooled to room temperature and crushed, then placed in a muffle furnace for calcination at 1000°C for 5 hours , crushed and sieved after cooling down to obtain NaNi 1 / 3 Fe 1 / 3 mn 1 / 3 o 2 Cathode material.

[0049] Step 2. Disperse the prepared positive electrode material in N-methyl-2-pyrrolidone, the solid-to-liquid ratio is 1:10, the ambient air humidity requirement is ≤15%, the temperature is kept at 25±5°C, and the mixture is dispersed at high speed for 15 minutes. Solution A, add 5wt% dopamine hydrochloride, stir and react for 24h in dry air at a stirring rate of 450rp...

Embodiment 2

[0058] Step 1, using a high-speed mixer, the general formula synthesized by the co-precipitation method is Mg 1 / 3 Fe 1 / 3 mn 1 / 3 (OH) 2 The precursor and sodium carbonate were mixed at a molar ratio of 1:1.05, kept in a muffle furnace at 1000°C for 15 hours, the heating rate was 5°C / min, cooled to room temperature and crushed, then placed in a muffle furnace for calcination at 1000°C for 5 hours , crushed and sieved after cooling down to obtain NaMg 1 / 3 Fe 1 / 3 mn 1 / 3 o 2 Cathode material.

[0059] Step 2. Disperse the prepared positive electrode material in N-methyl-2-pyrrolidone, the solid-to-liquid ratio is 1:10, the ambient air humidity is required to be ≤15%, the temperature is kept at 25±5°C, and the mixture is dispersed at high speed for 15 minutes. Solution A, add 5wt% dopamine hydrochloride, stir and react for 24h in dry air at a stirring rate of 450rpm.

[0060] Step 3. After the reaction is completed, the mixed solution B is obtained, the mixed solution B is f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

A preparation method of a polydopamine-coated sodium ion battery positive electrode material comprises the following steps: 1, preparing an MxFeyMnz (OH) 2 precursor through a coprecipitation method, 0 < x < = 0.5, 0 < = y < = 0.33, 0 < z < = 0.5, x + y + z = 1, and M is a transition metal ion; 2, mixing the precursor and a sodium source according to a molar ratio of 1: (1-1.1); the preparation method comprises the following steps: mixing the raw materials, sintering at a high temperature of 850-1100 DEG C for 10-20 hours to obtain the positive electrode material with the general formula of NaaMxFeyMnzO2, and a is more than 0.67 and less than 1.1; 3, adding the positive electrode material into the dispersing solvent, stirring and dispersing to obtain a first turbid liquid, and enabling the concentration of the positive electrode material in the first turbid liquid to be 0.1-0.5 g / mL; when the pH value of the first suspension is stabilized at 8-12, adding dopamine hydrochloride, and reacting for 10-30 hours at normal temperature and normal pressure in a dry environment to obtain a second suspension; and 4, filtering, washing and drying the second suspension to obtain the polydopamine-coated sodium ion battery positive electrode material. The coating layer is high in uniformity and excellent in storage performance in air, the thickness of the polymer coating layer is adjustable, the side reaction of the positive electrode material in electrolyte can be effectively inhibited in the circulation process, and the circulation stability of the sodium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium-ion batteries, in particular to a preparation method for anode materials for sodium-ion batteries coated with polydopamine. Background technique [0002] In the periodic table of elements, sodium and lithium are in the same main group, and their physical and chemical properties are very similar. Sodium-ion batteries have a similar working principle to lithium-ion batteries, except that sodium ions are deintercalated during charging and discharging. Compared with lithium resources, sodium is more abundant in the earth's crust and widely distributed around the world, simple to refine, and lower in cost. Therefore, large-scale commercial use of sodium-ion batteries will have a greater cost advantage. In addition, compared with lithium ions, sodium ions have lower solvation energy and better interfacial ion diffusion ability; the Stokes diameter is smaller, and the ion conductivity...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/054
CPCH01M4/628H01M4/625H01M4/505H01M4/525H01M10/054H01M2004/028H01M2004/021
Inventor 孟一鸣黄帅杰成鑫丽李加闯朱用王梁梁贺建军
Owner 南通金通储能动力新材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com