Unlock instant, AI-driven research and patent intelligence for your innovation.

A lithium iron phosphate/gel electrolyte composite positive electrode material and its preparation method and a solid lithium battery and its preparation method

A technology of composite cathode material and gel electrolyte, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of lithium ion transfer hindering, affecting the high rate performance and cycle stability of batteries, etc.

Active Publication Date: 2021-01-01
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the main bottleneck hindering the application of solid-state electrolytes is the interface between solid-state electrodes and solid-state electrolytes. The transfer of lithium ions between electrodes and electrolytes is hindered, which seriously affects the high-rate performance and cycle stability of batteries.

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 lithium iron phosphate/gel electrolyte composite positive electrode material and its preparation method and a solid lithium battery and its preparation method
  • A lithium iron phosphate/gel electrolyte composite positive electrode material and its preparation method and a solid lithium battery and its preparation method
  • A lithium iron phosphate/gel electrolyte composite positive electrode material and its preparation method and a solid lithium battery and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] The invention provides a preparation method of lithium iron phosphate / gel electrolyte composite positive electrode material, comprising the following steps:

[0057] (1) Mix and homogenize lithium iron phosphate powder, conductive carbon black, polyethylene glycol diacrylate, photoinitiator, lithium salt solution and dispersing solvent to obtain a homogeneous slurry;

[0058] (2) coating the homogeneous slurry prepared in the step (1) on the surface of the current collector to obtain a pole piece;

[0059] (3) UV-curing the pole piece obtained in the step (2) to obtain a lithium iron phosphate / gel electrolyte composite positive electrode material.

[0060] In the invention, lithium iron phosphate powder, conductive carbon black, polyethylene glycol diacrylate, photoinitiator, lithium salt solution and dispersion solvent are mixed homogeneously to obtain homogeneous slurry.

[0061] In the present invention, the mass ratio of the lithium iron phosphate powder to the con...

Embodiment 1

[0097] Preparation of lithium iron phosphate / gel electrolyte composite positive electrode:

[0098] (1) Mix and stir lithium iron phosphate powder, conductive carbon black, polyethylene glycol diacrylate monomer (PEGDA), photoinitiator and lithium ion electrolyte with anhydrous acetonitrile to obtain a homogeneous slurry. Among them, the particle size of lithium iron phosphate powder is 200-800nm, the mass ratio of lithium iron phosphate powder to conductive carbon black (Super P) is 3:1; the relative molecular mass of PEGDA is 400;

[0099] Lithium-ion electrolyte is 1mol L -1 LiPF 6 Electrolyte, solvent is the mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) that the volume ratio is 1:1; Lithium ion in lithium ion electrolyte and PEGDA monomer in the molar ratio of -CCO- segment is 7:1, the mass ratio of lithium salt to lithium iron phosphate in the lithium ion electrolyte is 1:8; the photoinitiator uses 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), a...

Embodiment 2

[0113] Preparation of lithium iron phosphate / gel electrolyte composite positive electrode:

[0114] (1) Mix and stir lithium iron phosphate powder, conductive carbon black, polyethylene glycol diacrylate monomer (PEGDA), photoinitiator and lithium ion electrolyte with anhydrous acetonitrile to obtain a homogeneous slurry. Among them, the particle size of lithium iron phosphate powder is 200-800nm, the mass ratio of lithium iron phosphate powder to conductive carbon black (Super P) is 7:2; the relative molecular mass of PEGDA is 600;

[0115] Lithium-ion electrolyte is 1mol L -1 LiClO 4Electrolyte, solvent is the mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC) that the volume ratio is 1:1; In the lithium ion electrolyte, the mol ratio of -CCO- segment in lithium ion and PEGDA monomer is 8:1, the mass ratio of lithium salt to lithium iron phosphate in the lithium ion electrolyte is 1:20; the photoinitiator uses 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMP...

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
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a lithium iron phosphate / gel electrolyte composite positive electrode material and a preparation method thereof. In the process of preparing the composite positive electrode material in the present invention, the lithium iron phosphate powder, conductive carbon black and lithium salt solution are coated on the current collector in the form of homogeneous slurry and then cured by ultraviolet light, so that the electrolyte is uniformly coated On the surface of lithium iron phosphate nanoparticles, the uniform coating gel electrolyte on the surface of lithium iron phosphate powder is realized, and the combination of positive electrode material and electrolyte molecular level is realized, thereby significantly increasing the contact area between the electrolyte and lithium iron phosphate , promote the transfer and transport of lithium ions, and reduce the polarization and interfacial impedance of the electrode. The present invention also provides a solid-state lithium battery obtained by adopting the positive electrode described in the above technical solution.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and in particular relates to a lithium iron phosphate / gel electrolyte composite positive electrode material and a preparation method thereof, and a solid-state lithium battery and a preparation method thereof. Background technique [0002] With the continuous development of the global economy and the continuous improvement of people's living standards, energy and environmental issues have become increasingly prominent. As a carrier for electric energy storage, lithium-ion secondary batteries have the advantages of high energy density, long cycle life, small self-discharge effect, and environmental friendliness. At present, they have been widely used in mobile phones, digital portable products and other fields. As an important part of lithium-ion batteries, electrolyte plays an important role in transporting ions. However, safety problems such as leakage, combustion and even...

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): H01M4/36H01M10/0525H01M10/058
CPCH01M4/362H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王秀丽张晟昭涂江平夏新辉谷长栋
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV