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Quasi-solid-state battery positive electrode slurry as well as preparation method and application thereof

A battery cathode, quasi-solid-state technology, applied in electrode manufacturing, battery electrodes, batteries, etc., can solve the problems affecting the cycle stability and safety of the battery cell, reducing the peel strength of the pole piece, and reducing the stability of the slurry, etc. Cycling stability and rate capability, inhibiting lithium dendrite growth, and improving mechanical properties

Active Publication Date: 2020-12-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reducing the amount of binder will affect the homogenization process, the stability of the slurry will be reduced, the peel strength of the prepared pole piece will be reduced, and the coating will be easily peeled off from the current collector. The progress of the liquid side reaction will continuously generate a new SEI film, and the side reaction will continue to occur at the interface, and the lithium dendrite will continue to grow, which will seriously affect the cycle stability and safety of the battery cell.

Method used

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  • Quasi-solid-state battery positive electrode slurry as well as preparation method and application thereof
  • Quasi-solid-state battery positive electrode slurry as well as preparation method and application thereof
  • Quasi-solid-state battery positive electrode slurry as well as preparation method and application thereof

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preparation example Construction

[0073] According to the method for preparing the above-mentioned quasi-solid-state battery positive electrode slurry according to the embodiment of the present invention, the method significantly increases the stability of the homogenate coating process by introducing an ion-conducting gel copolymer, and improves the rate performance and cycle performance of the battery. The use of electrolyte is reduced to improve the safety performance of the battery. Specifically, the ion-conducting gel copolymer can be used as Li + Transport carrier, undertake the role of the solvent in the electrolyte to synergistically promote Li + Transmission in the pole piece; in addition, the mechanical properties of the pole piece are improved by introducing ion-conducting gel copolymer, which endows the pole piece with flexibility, which can effectively relieve the volume expansion of the pole piece during charge and discharge, and improve the electrode material The stability of the Li + The tran...

Embodiment 1

[0079] 1) Preparation of ion-conducting copolymer:

[0080] Stir 0.1kg triethylene glycol dimethacrylate, 3.5kgNMP, 0.01kgEC and 0.002kgGLCDA with a homogenizer to obtain a clear solution, then add 0.12kgLiTFSI and 0.07kgSP to make a clear glue solution, and then add 0.07kg Azepanitril, 18h at 70°C, prepared a brown glue solution, that is, an ion-conducting gel copolymer.

[0081] 2) Preparation of ternary cathode slurry:

[0082] Add 10 kg of ternary material (NCM) to the glue solution prepared in step 1), and mix evenly to prepare ternary positive electrode slurry.

[0083] 3) Preparation of ternary positive pole piece:

[0084] Apply the ternary positive electrode slurry prepared in step 2) with a laboratory automatic coater, and apply the gap between the coating blades (adjust the target surface density: 15mg / cm 2 ), apply the slurry on the aluminum foil, and bake the coated electrode sheet at 120°C for 10 minutes to obtain the ternary positive electrode sheet.

Embodiment 2

[0086] 1) Preparation of ion-conducting copolymer:

[0087] Stir 0.08kg ethylene glycol dimethacrylate, 3kgNMP, 0.012kgPC and 0.0024kgGLCDA with a homogenizer to obtain a clear solution, then add 0.07kgLiPF 6 Stir with 0.12kg of VGCF to prepare a clear glue solution, then add 0.12kg of azobiheptanonitrile for 12 hours at 70°C to prepare a brown glue solution, that is, an ion-conducting gel copolymer.

[0088] 2) Preparation of ternary cathode slurry:

[0089] Add 10 kg of ternary material (NCM) to the glue solution prepared in step 1), and mix evenly to prepare ternary positive electrode slurry.

[0090] 3) Preparation of ternary positive pole piece:

[0091] Apply the ternary positive electrode slurry prepared in step 2) with a laboratory automatic coater, and apply the gap between the coating blades (adjust the target surface density: 15mg / cm 2 ), apply the slurry on the aluminum foil, and bake the coated electrode sheet at 120°C for 10 minutes to obtain the ternary posit...

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Abstract

The invention discloses quasi-solid-state battery positive electrode slurry as well as a preparation method and application thereof. The quasi-solid-state battery positive electrode slurry comprises apositive electrode active material, a conductive ion gel copolymer and an organic solvent. By introducing the conductive ion gel copolymer, the stability of the homogenate coating process is remarkably improved, and the rate capability, the cycle performance and the safety performance of the quasi-solid-state battery are improved.

Description

technical field [0001] The invention belongs to the technical field of quasi-solid-state batteries, and in particular relates to a quasi-solid-state battery anode slurry and a preparation method and application thereof. Background technique [0002] With the rapid development and progress of society, the problem of energy shortage and environmental pollution is becoming more and more serious, and people pay more and more attention to the demand for clean energy; Safe lithium-ion battery. At present, lithium-ion power batteries mostly use lithium iron phosphate and ternary materials as the positive electrode. However, due to the continuous improvement of energy density and safety performance requirements, it is becoming more and more difficult to continue to increase the energy density in the existing battery design system, especially for high-end batteries. In terms of continuation vehicles. [0003] At present, the main classifications of battery conductive agents are SP,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/04H01M4/1391H01M10/0525
CPCH01M4/622H01M4/624H01M4/628H01M4/131H01M4/0404H01M4/1391H01M10/0525H01M2004/021H01M2004/028H01M2220/20Y02E60/10
Inventor 李小栓李晓龙邓素祥陈少杰
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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