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Lithium iron phosphate/gel electrolyte composite positive electrode material, preparation method thereof, solid-state lithium battery and preparation method of solid-state lithium battery

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: 2018-09-18
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

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  • Lithium iron phosphate/gel electrolyte composite positive electrode material, preparation method thereof, solid-state lithium battery and preparation method of solid-state lithium battery
  • Lithium iron phosphate/gel electrolyte composite positive electrode material, preparation method thereof, solid-state lithium battery and preparation method of solid-state lithium battery
  • Lithium iron phosphate/gel electrolyte composite positive electrode material, preparation method thereof, solid-state lithium battery and preparation method of solid-state lithium battery

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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...

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Abstract

The invention provides a lithium iron phosphate / gel electrolyte composite positive electrode material and a preparation method thereof. During the composite positive electrode material preparation process, lithium iron phosphate powder, conductive carbon black and a lithium salt solution are coated on a current collector in a homogenous paste form, ultraviolet photocuring is performed, so that anelectrolyte is uniformly coated on surfaces of lithium iron phosphate nanoparticles, the gel electrolyte is uniformly coated on a surface of the lithium iron phosphate powder, molecule-level combination of the positive electrode material and the electrolyte is achieved, the contact area between the electrolyte and the lithium iron phosphate is remarkably expanded, lithium ion transfer and transmission are facilitated, and electrode polarization and interface impedance are reduced. The invention also provides a solid-state lithium battery obtained by employing the positive electrode provided bythe technical scheme.

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

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Application Information

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Patent Type & Authority Applications(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