Check patentability & draft patents in minutes with Patsnap Eureka AI!

Hydrothermal synthesis method of lithium iron manganese phosphate

A technology of lithium manganese iron phosphate and hydrothermal synthesis, which is applied to the preparation/purification of phosphorus compounds, chemical instruments and methods, and carbon. It can solve the problems of large sample particle size and poor electrochemical performance, and achieve the specific capacity of charge and discharge. High, reduced synthesis cycle, excellent electrochemical performance

Pending Publication Date: 2020-12-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF12 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a hydrothermal synthesis method of lithium manganese iron phosphate, to solve the problem of large sample particle size and poor electrochemical performance in the process of hydrothermal synthesis of lithium manganese iron phosphate solid solution

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
  • Hydrothermal synthesis method of lithium iron manganese phosphate
  • Hydrothermal synthesis method of lithium iron manganese phosphate
  • Hydrothermal synthesis method of lithium iron manganese phosphate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] In the specific implementation process, the hydrothermal synthesis method of lithium manganese iron phosphate solid solution of the present invention, the specific steps are as follows:

[0040] (1) Synthesis of lithium manganese iron phosphate solid solution: under stirring, lithium hydroxide monohydrate is added to deionized water or distilled water, then phosphoric acid solution is added dropwise, then ferrous sulfate heptahydrate, manganese sulfate monohydrate and Antioxidant ascorbic acid (the molar ratio of lithium hydroxide monohydrate, phosphoric acid, ferrous sulfate heptahydrate, manganese sulfate monohydrate and antioxidant ascorbic acid is (2.5~3.5):(0.5~1.5):(0.1~1.2):(0.1~ 1.2): (0.001~0.01)), heating the mixed solution to 140~200℃ under microwave heating for 5~60min under stirring state, and preparing lithium manganese iron phosphate solid solution, followed by solid-liquid separation to obtain off-white precipitate ferromanganese phosphate lithium.

[0...

Embodiment 1

[0053] In this example, pure deionized water was used as the reaction solvent by the hydrothermal method, and nanorod-shaped LiFe was prepared by microwave stirring and heating. 0.5 mn 0.5 PO 4 solid solution. The lithium source is neutralized with lithium hydroxide monohydrate and phosphoric acid to generate lithium phosphate in the reactor, the iron source is ferrous sulfate heptahydrate, the manganese source is manganese sulfate monohydrate, and the antioxidant is ascorbic acid.

[0054] The specific method of hydrothermal synthesis is: take a polytetrafluoroethylene tank as a reaction kettle, get 9.2g of lithium hydroxide monohydrate and add it to 55mL of deionized water under stirring, then add 5.14mL of phosphoric acid (concentration 85wt%), 10.04 g ferrous sulfate heptahydrate, 6.1038 g manganese sulfate monohydrate and 0.2 g ascorbic acid. After being stirred evenly, it was quickly transferred to a microwave heating workstation, and heated to 180°C for 14 minutes un...

Embodiment 2

[0058] The difference from Example 1 is that the reaction time used in the experiment is different, and the nanorod-shaped LiFe 0.5 mn 0.5 PO 4 ( Figure 10 ). In this embodiment, the lithium source adopts lithium hydroxide monohydrate and phosphoric acid to be added in the reaction kettle successively, in the reaction kettle, lithium phosphate is generated through neutralization reaction, the iron source adopts ferrous sulfate heptahydrate, and the manganese source adopts manganese sulfate monohydrate, The antioxidant uses ascorbic acid.

[0059] The solution used was pure deionized water. The hydrothermal conditions are: temperature 180°C, time 5min.

[0060]The specific method of the carbon coating method is as follows: first rinse the synthesized lithium manganese iron phosphate solid solution with water, and then rinse it with alcohol; then, mix the carbon source and the lithium manganese iron phosphate solid solution at a mass ratio of 1:4, and put them into the tub...

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
Discharge specific capacityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of lithium ion battery materials, in particular to a hydrothermal synthesis method of lithium iron manganese phosphate, and solves the problems of long synthesis period, large sample particle size and poor electrochemical performance of hydrothermal synthesis of lithium iron manganese phosphate. According to the method, lithium hydroxide monohydrate, phosphoric acid, ferrous sulfate heptahydrate and manganese sulfate monohydrate are adopted as raw materials, microwave heating is utilized in a stirring state, the nanorod-shaped lithium manganese iron phosphatepositive electrode materials with different molar ratios of Fe to Mn are synthesized in water, and an electrochemical test shows that the electrochemical performance of a LiFe0.5Mn0.5PO4 solid solution is the most excellent. By utilizing a microwave stirring and heating method, a nucleation time window can be reduced, and the nano-sized lithium iron manganese phosphate nanocrystals are synthesized in a pure water environment. By adopting the microwave hydrothermal method, the supersaturation degree of the solution can be improved, and the synthesized nanorod lithium manganese iron phosphate can be uniformly suspended and dispersed in the solution, so that more raw materials can be fed in unit volume, higher yield is obtained, and the method is more suitable for industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a hydrothermal synthesis method of lithium manganese iron phosphate. Background technique [0002] According to the "Paris Agreement" signed in December 2015, major economies in the world have successively issued timetables for banning the sale of fuel vehicles. As an alternative, safe high-performance batteries are urgently needed for hybrid electric vehicles and electric vehicles. LiFePO with olivine structure 4 It is recognized as the safest cathode material, but its theoretical energy density is low (586Wh kg -1 ), which limits its wide application. LiMnPO 4 with LiFePO 4 With the same crystal structure, the voltage platform is high (4.1V), and the theoretical energy density is 701Wh kg -1 , than LiFePO 4 20% higher, but due to the Jahn-Teller effect, Mn 3+ lead to MnO 6 The distortion of the octahedron hinders the Li + The migration of ions, its actual ...

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
IPC IPC(8): C01B25/45H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00C01B32/05B82Y30/00
CPCB82Y30/00B82Y40/00C01B25/45C01P2002/72C01P2004/04C01P2004/16C01P2006/40C01B32/05H01M4/366H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 王晓辉杨金星
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com