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Porous three-element compound positive plate as well as preparation method and application thereof

A ternary composite and positive electrode technology, applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve problems such as low cycle life of solid-state batteries, poor electrode/electrolyte interface compatibility, and interface impedance affecting ion transmission. Achieve the effect of enhancing the ability of ion transport, improving electrochemical performance, and improving interfacial compatibility

Active Publication Date: 2018-08-17
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there is basically no side reaction of solid-state electrolyte decomposition at the interface between the solid-state electrolyte and the electrode material, the solid properties make the electrode / electrolyte interface compatibility poor, and the high interface impedance seriously affects the ion transmission, which ultimately leads to the low cycle life of the solid-state battery. , Poor magnification performance
In addition, the energy density cannot meet the requirements of large batteries

Method used

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  • Porous three-element compound positive plate as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A porous ternary composite positive electrode, characterized in that: the porous ternary positive electrode comprises the following materials: ternary 532, Surpe-P, polyvinylidene fluoride, lithium lanthanum zirconium tantalum oxide, LiTFSI and acetone, the mass parts of each material They are: ternary 532: 80 parts, Surpe-P: 5 parts, polyvinylidene fluoride: 5 parts, lithium lanthanum zirconium tantalum oxide: 15 parts, LiTFSI: 10 parts, acetone: 5 parts.

[0025] A preparation method for a porous ternary composite positive electrode sheet, comprising the following steps: Step 1: Mix ternary 532, Surpe-P, polyvinylidene fluoride, lithium lanthanum zirconium tantalum oxide and LiTFSI uniformly and then disperse them in N-methylpyrrolidone in solution;

[0026] Step 2: fully stir with a vacuum planetary mixer to obtain a positive electrode slurry;

[0027] Step 3: Then add uniformly dispersed acetone, and fully stir with a vacuum planetary mixer to obtain a composite po...

Embodiment 2

[0033] A porous ternary composite positive electrode is characterized in that: the porous ternary positive electrode comprises the following materials: ternary 532, acetylene black, polyvinylidene fluoride, lithium lanthanum titanium oxide, LiClO 4 and polyvinylpyrrolidone, the mass parts of each material are: ternary 532:85 parts, acetylene black: 2 parts, polyvinylidene fluoride: 3 parts, lithium lanthanum titanium oxide: 7 parts, LiClO 4 : 4 parts, polyvinylpyrrolidone: 4 parts.

[0034] A preparation method of a porous ternary composite positive electrode sheet, comprising the following steps: Step 1: combine ternary 532, acetylene black, polyvinylidene fluoride, lithium lanthanum titanium oxide and LiClO 4 After mixing evenly, disperse in N-methylpyrrolidone solution;

[0035] Step 2: fully stir with a vacuum planetary mixer to obtain a positive electrode slurry;

[0036] Step 3: then add uniformly dispersed polyvinylpyrrolidone, and fully stir with a vacuum planetary m...

Embodiment 3

[0042] A porous ternary composite positive electrode, characterized in that: the porous ternary positive electrode comprises the following materials: ternary 532, graphene, polyvinylidene fluoride, lithium lanthanum zirconium oxygen, LiPF 6 And ammonia carbonate, the mass parts of each material are: ternary 532:90 parts, graphene: 1 part, polyvinylidene fluoride: 2 parts, lithium lanthanum zirconium oxygen: 2 parts, LiPF 6 : 3 parts, ammonia carbonate: 2 parts.

[0043] A preparation method of a porous ternary composite positive electrode sheet, comprising the following steps: step 1: combining ternary 532, graphene, polyvinylidene fluoride, lithium lanthanum zirconium oxygen, LiPF 6 After mixing evenly, disperse in N-methylpyrrolidone solution;

[0044] Step 2: fully stir with a vacuum planetary mixer to obtain a positive electrode slurry;

[0045] Step 3: then add uniformly dispersed ammonia carbonate, and fully stir with a vacuum planetary mixer to obtain a composite positi...

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Abstract

The invention discloses a porous three-element compound positive plate. The porous three-element compound positive plate is characterized by being prepared from the following materials of a three-element main material, a conducting agent, a binding agent, a fast ionic conductor, lithium salt and a pore forming agent. According to mass fraction of all the materials, the three-element main materialis 80 to 90 parts, the conducting agent is 1 to 5 parts, the binding agent is 2 to 5 parts, the fast ionic conductor is 2 to 15 parts, the lithium salt is 3 to 10 parts, and the pore forming agent is2 to 5 parts. The porous three-element compound positive plate has the advantages that in the porous three-element compound positive plate disclosed by the invention, solid electrolyte is poured intoa pole plate, so that electrode / electrolyte interface compatibility is improved, ion transmission capacity in the pole plate is enhanced, and whole electrochemical performance of a cell is improved. The porous three-element compound plate disclosed by the invention can be applied to the field of solid cells and has large-scale batch production possibility.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, a porous ternary composite positive electrode sheet, a preparation method of a porous ternary composite positive electrode sheet, and an application of a porous ternary composite positive electrode sheet. Background technique [0002] All-solid-state lithium-ion batteries use solid-state electrolytes to replace traditional organic liquid electrolytes, which are expected to fundamentally solve battery safety problems and are ideal chemical power sources for electric vehicles and large-scale energy storage. Stable solid-state electrolytes and high-energy electrode materials for all-solid-state lithium-ion batteries and improved electrode / solid-state electrolyte interface compatibility. [0003] Although there is basically no side reaction of solid electrolyte decomposition at the interface between the solid electrolyte and the electrode material, the solid characteristics make the electrode / ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0404H01M4/131H01M4/1391H01M10/0525Y02E60/10
Inventor 李峥冯玉川何泓材李培养杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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