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

Preparation method of battery positive electrode material

A technology of positive electrode material and coating layer, which is applied in the field of preparation of battery positive electrode material, and can solve the problem that the performance/comprehensive performance is difficult to meet the use requirements and so on.

Inactive Publication Date: 2019-12-20
程立勋
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the modification methods currently researched are focused on a certain aspect of lithium iron phosphate. Although the modified material has improved in a single performance, its performance / comprehensive performance is still difficult to meet the use requirements.

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 battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: prepare phosphoric acid solution and ferrous sulfate solution, get and mix with two solutions according to the mol ratio of phosphoric acid and ferrous sulfate 1:1, then add nano titanium carbide powder, lycopene and sixteen Alkyltrimethylammonium bromide, add nano-titanium carbide powder according to the amount of adding 2g nano-titanium carbide powder per mole of ferrous sulfate, add lycopene according to the amount of adding 12g of lycopene per mole of ferrous sulfate, according to Add 55g of cetyltrimethylammonium bromide per mole of ferrous sulfate, add CTAB, ultrasonically disperse and mix, and heat the solution to 60°C, then add ammonia water dropwise to adjust the pH to 6, react for 1.5h, filter and recover the reaction product, soak the reaction product in acetone, wash and dry to obtain doped and surface-modified modified ammonium ferrous phosphate; modify ammonium ferrous phosphate and ammonium carbonate, lithium oxalate, starch Put into deioniz...

Embodiment 2

[0010] Embodiment 2: prepare phosphoric acid solution and ferrous sulfate solution, get and mix with two solutions according to the mol ratio of phosphoric acid and ferrous sulfate 1:1, then add nano-titanium carbide powder, lycopene and sixteenth in mixed solution Alkyltrimethylammonium bromide, add nano-titanium carbide powder according to the amount of adding 2.1g nano-titanium carbide powder per mole of ferrous sulfate, add lycopene according to the amount of adding 10g lycopene per mole of ferrous sulfate, Add CTAB according to the amount of 50g cetyltrimethylammonium bromide per mole of ferrous sulfate, ultrasonically disperse and mix, and heat the solution to 60°C, then add ammonia water dropwise to adjust the pH to 4, react for 1h, filter and recover the reaction product, soak the reaction product in acetone, wash and dry to obtain doped and surface-modified modified ammonium ferrous phosphate; modify ammonium ferrous phosphate and ammonium carbonate, lithium oxalate, s...

Embodiment 3

[0011] Example 3: Weigh the positive electrode materials prepared in Examples 1 to 2 respectively, and make lithium battery positive electrodes according to the mass ratio of positive electrode material: SP:CNT:PVDF=95:2:0.5:2.5, and first dissolve PVDF in the solvent NMP Form the glue, then add the positive electrode material and the conductive agent SP to the solvent NMP, add the CNT conductive liquid after stirring and dispersing, add the pre-prepared glue after high-speed dispersion, and form the positive electrode slurry by adjusting the viscosity after high-speed dispersion. The positive electrode slurry is 150g / m according to the surface density 2 Coated on 15um aluminum foil, and according to 2.4g / cm 3 The compaction density is rolled into a positive electrode sheet.

[0012] Lithium metal is used as the negative electrode, Celgard2325 polypropylene microporous membrane is used as the diaphragm, and 1mol / L LiPF is used 6 / EC / DMC (the volume ratio of EC and DMC is 1:1...

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

No PUM Login to View More

Abstract

The invention relates to a preparation method of a positive electrode material. The preparation method comprises the following steps: doping silicon carbide and ammonium ferrous phosphate and modifying the surface of the ammonium ferrous phosphate to form a first coating layer; and preparing lithium iron phosphate and forming a second coating layer on the outer surface of the lithium iron phosphate and performing heat treatment on the lithium iron phosphate so that the first and second coating layers become carbon coating. According to the technical scheme, Through double-layer carbon coatingwith network structure, pore-forming on the surface of nano-sheet and doping of silicon carbide, the multi-dimensional and multi-stage pore structure is formed through double carbon coating of the netstructure, surface poring of nano-sheets and doping of silicon carbide so that the contact range between the carbon and the lithium iron phosphate is significantly improved, the transmission distanceof lithium ions is shortened, the electronic conductive channel is increased, the conductivity is improved, the contact infiltration between the active materials and the electrolyte is increased andthe rapid transmission of the lithium ions is facilitated.

Description

technical field [0001] The invention relates to the field of lithium battery production, in particular to a method for preparing a positive electrode material of a battery. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high energy density, no memory effect, safety and reliability, good thermal stability, long cycle life, and environmental protection. They are currently the most widely used secondary batteries. At present, the mainstream ones are lithium iron phosphate and ternary systems. From the perspective of safety performance and cycle life, two important indicators of power batteries, lithium iron phosphate batteries have more advantages. However, lithium iron phosphate also has certain disadvantages, such as low intrinsic electronic conductivity and small diffusion coefficient of lithium ions, which seriously affect the electrochemical performance of lithium iron phosphate, especially in high-rate charging and dischargin...

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): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 程立勋
Owner 程立勋
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