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

A kind of preparation method of manganese-based Prussian white cathode material and its application in sodium-ion battery electrode

A sodium-ion battery and Prussian white technology, which is applied in the field of new energy storage batteries, can solve the problems affecting the specific capacity of reaction products, slow manganese salt solution drop rate, and low specific capacity of electrode materials, so as to achieve low cost and improve battery life. Chemical properties, effect of increasing sodium content

Active Publication Date: 2021-06-22
宇恒电池股份有限公司 +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the vacancy defects and crystal water content in synthetic materials, the method of controlling the reaction rate is often adopted. The manganese salt solution has a very slow dropping rate, generally less than 5ml / min, and the synthesis efficiency is relatively low.
If the reaction rate is too fast, the obtained Prussian white often contains more crystal water and vacancy defects, and its sodium content is extremely low, and the corresponding electrode material has a low specific capacity and poor cycle stability.
[0004] The patent document whose application publication number is CN107611404A discloses a Prussian white composite material and its preparation method and application, and the patent document whose application publication number is CN108821310A discloses a kind of Prussian white material and its preparation method and application. The synthesis conditions are all open-type hydrothermal reactions, which is not conducive to further improving the crystallinity of the material, and affects the improvement of the specific capacity of the reaction product.

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
  • A kind of preparation method of manganese-based Prussian white cathode material and its application in sodium-ion battery electrode
  • A kind of preparation method of manganese-based Prussian white cathode material and its application in sodium-ion battery electrode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] This embodiment discloses a method for preparing a manganese-based Prussian white cathode material, which includes the following steps:

[0027] Step 1), dissolving the manganese salt containing divalent manganese ions in deionized water to form solution A; wherein the manganese salt is selected from one or more of manganese chloride, manganese sulfate, and manganese nitrate ;

[0028] Step 2), dissolving sodium ferrocyanide in deionized water to form solution B;

[0029] Step 3), drop solution A into solution B for co-precipitation reaction to obtain a suspension solution, the dropping rate of solution A is 5mL / min~40mL / min; preferably, the dropping rate of solution A is 10mL / min~30mL / min, and the Mn in solution A 2+ With [Fe(CN) in solution B 6 ] 2- The molar ratio is 1 to 2.1;

[0030] Step 4), move the suspension solution obtained in step 3) to the reaction kettle, and add soluble sodium salt, after a certain period of hydrothermal reaction, the hydrothermal r...

Embodiment 1

[0033] Step 1) manganese sulfate is dissolved in deionized water to obtain 2+ The concentration is 500mL of the solution of 0.3mol / L, and the solution A is obtained through thorough stirring;

[0034] Step 2) dissolving sodium ferrocyanide in deionized water, stirring evenly to obtain 500 mL of B solution whose concentration in terms of ferrocyanide ion is 0.2mol / L; 2+ with [Fe(CN) 6 ] 2- The molar ratio is 1.5;

[0035] Step 3) Then use a peristaltic pump to pump solution A into solution B at a rate of 10mL / min, during which solution B is kept in a state of rapid stirring;

[0036] Step 4) Move the reacted solution into a reaction kettle, add 0.15 mol NaCl, seal it, carry out hydrothermal reaction, keep warm at 80°C for 3 hours, and after hydrothermal reaction, cool, wash and dry to obtain manganese-based Prussian white.

[0037] figure 1 The scanning electron micrograph of the manganese-based Prussian white prepared in Example 1 shows that the particles obtained after t...

Embodiment 2

[0039] Step 1) manganese chloride is dissolved in deionized water to obtain 2+ The concentration is 500mL of the solution of 0.3mol / L, and the solution A is obtained through thorough stirring;

[0040] Step 2) dissolving sodium ferrocyanide in deionized water, stirring evenly to obtain 500 mL of B solution whose concentration in terms of ferrocyanide ion is 0.3mol / L; 2+ with [Fe(CN) 6 ] 2- The molar ratio of is 1;

[0041] Step 3) Then use a peristaltic pump to pump solution A into solution B at a rate of 20mL / min, during which solution B is kept in a state of rapid stirring;

[0042] Step 4) the solution after the reaction moves in the reactor, and adds 0.3molNa 2 SO 4 , after sealing, carry out hydrothermal reaction, heat preservation at 90°C for 5 hours, after hydrothermal reaction, after cooling, washing and drying, manganese-based Prussian white is obtained.

[0043]The Prussian white prepared in this example was used as the positive electrode material to make a pos...

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
current efficiencyaaaaaaaaaa
current efficiencyaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a manganese-based Prussian white positive electrode material, which comprises the following steps: step 1), dissolving manganese salt containing divalent manganese ions in deionized water to form solution A; step 2), dissolving ferrous Sodium cyanide is dissolved in deionized water to form solution B; step 3), solution A is dropped into solution B for co-precipitation reaction to obtain a suspension solution; step 4), the suspension solution obtained in step 3) is moved to the reactor , and adding soluble sodium salt, after hydrothermal reaction for a certain period of time, suction filtration, drying and precipitation to obtain the manganese Prussian white cathode material. The preparation method of the present invention can regulate the morphology and size distribution of the product, and the prepared manganese-based Prussian white has good crystallinity, which can significantly improve the electrochemical performance of the sodium-ion battery when applied to the electrode of the sodium-ion battery, especially It can effectively improve the charge and discharge capacity.

Description

technical field [0001] The invention relates to the technical field of novel energy storage batteries, more specifically, it relates to a preparation method of a manganese-based Prussian white cathode material and its application in sodium-ion battery electrodes. Background technique [0002] At present, green energy has been widely used in the energy field. Using wind power, solar energy, etc. to generate electricity and connect to the grid requires large-scale energy storage technology to store electric energy and balance grid loads. Electrochemical energy storage has the advantages of high energy conversion efficiency and convenient use, and its application in the field of energy storage is increasing year by year. At present, lithium-ion batteries are mainly used for electrochemical energy storage. Due to the wide application fields of lithium-ion batteries, the consumption of lithium resources is huge. However, the global lithium resources are limited, and there is cur...

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 Patents(China)
IPC IPC(8): C01C3/11C01G45/00H01M4/58H01M10/054
CPCC01C3/11C01G45/006C01P2004/03C01P2006/40H01M4/58H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 苗义高金哲宇刘敏王重威王梁徐建平徐玉兰傅军毅
Owner 宇恒电池股份有限公司
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