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Manufacturing method of all solid state power lithium ion battery

A lithium-ion battery and a manufacturing method technology are applied in the manufacturing field of all-solid-state power lithium-ion batteries, which can solve the problems of large interface impedance, loss of specific capacity of pole pieces, and reduction of active material content of pole pieces, so as to reduce interface resistance, increase high safety effect

Active Publication Date: 2018-06-29
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous promotion of lithium-ion battery new energy vehicles, traditional lithium-ion power batteries have been difficult to meet the requirements of automobiles for safety and cruising range, especially the electrolytes used by current lithium-ion power batteries are mostly flammable and explosive organic Solvent system, especially for safety hazards in the automotive field; and all-solid-state lithium-ion power batteries made of solid-state electrolytes can greatly improve the safety of power batteries and increase battery energy density
[0003] The contact state and tightness of the electrolyte / electrode interface in an all-solid-state lithium battery directly affect lithium ion transmission. The interface impedance of a solid-state lithium battery prepared by simple stacking of traditional electrode sheets and electrolytes is too large; adding a solid electrolyte to the electrode can improve The interface contact of electrolyte / electrode reduces the interface impedance, but too much electrolyte addition in the electrode (20% to 30% mass ratio) will greatly reduce the active material content of the pole piece, resulting in excessive loss of the specific capacity of the pole piece

Method used

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  • Manufacturing method of all solid state power lithium ion battery
  • Manufacturing method of all solid state power lithium ion battery
  • Manufacturing method of all solid state power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) The positive electrode slurry is prepared according to the following mass ratio: NCM523 positive electrode material 95%, Super PLi conductive agent 2%, HSV-900PVDF binder 1.5%; PEO solid electrolyte 1.5%, prepared by a double planetary mixer with NMP as a solvent A positive electrode slurry with a solid content of 65%.

[0036] (2) Negative electrode pulping is according to the following mass ratio: 96% of artificial graphite G9, 1% of conductive graphite conductive agent, 1.5% of HSV-900PVDF binder, 1.5% of PEO solid state electrolysis, prepared by double planetary mixer with NMP as solvent A negative electrode slurry with a solid content of 45%.

[0037] (3) The electrolyte solution is in accordance with the following mass ratio: PEO polymer electrolyte 95%, Al 2 o 3 The filler ratio is 2%; LiPF 6 The proportion of lithium salt is 3%; an electrolyte solution with a solid content of 15% is prepared by using a double planetary mixer and using NMP as a solvent.

...

Embodiment 2

[0041] (1) Positive electrode pulping is according to the following mass ratio: 97% of NCA positive electrode material, 1% of acetylene black conductive agent, 1% of PTFE binder; 1% of PMMA solid electrolyte, prepared into a solid slurry with acetonitrile as solvent by double planetary mixer A positive electrode slurry with a content of 80%.

[0042] (2) Negative electrode pulping is according to the following mass ratio: silicon carbon negative electrode material accounts for 98%, vapor phase growth carbon fiber 0.5%, HSV-900PVDF binder 1%, PMMA series solid state electrolysis 0.5%, through double planetary mixer, with NMP as solvent A negative electrode slurry with a solid content of 30% was prepared.

[0043] (3) The electrolyte solution is in accordance with the following mass ratio: PMMA polymer electrolyte 80%, MOF filler ratio 10%; LiCF 3 SO 3 The proportion of lithium salt is 10%; an electrolyte solution with a solid content of 80% is prepared by using acetonitrile a...

Embodiment 3

[0047] (1) Positive electrode pulping is according to the following mass ratio: 87% of lithium iron phosphate positive electrode material, 5% of graphene conductive agent, 3% of PVA binder; 5% of PAN solid electrolyte, prepared by using NMP as a solvent through a double planetary mixer A positive electrode slurry with a solid content of 30%.

[0048] (2) Negative electrode pulping is according to the following mass ratio: hard carbon accounts for 89%, vapor-phase grown carbon fiber conductive agent 3%, CMC binder 3%, PAN series solid-state electrolysis 5%, through double planetary mixer, NMP is prepared as solvent. Negative electrode slurry with a solid content of 60%.

[0049] (3) The electrolyte solution is in accordance with the following mass ratio: PAN-based polymer electrolyte 98.5%, nano-SiO 2 The proportion of similar fillers is 0.5%; LiClO 4 The proportion of lithium salt is 1%; an electrolyte solution with a solid content of 10% is prepared by using a double planet...

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Abstract

The invention discloses a manufacturing method of an all solid state power lithium ion battery. The manufacturing method comprises the steps of dissolving an anode active material, a conductive agent,an adhesive and a polymer electrolyte in a solvent, so as to prepare an anode sizing agent, applying the anode sizing agent to an anode current collector, performing thermal treatment and rolling treatment so as to obtain an anode piece; then dissolving a cathode material, a conductive agent, an adhesive and a polymer electrolyte in a solvent, so as to prepare a cathode sizing agent, applying thecathode sizing agent to a cathode current collector, and performing thermal treatment and rolling treatment so as to obtain a cathode piece; dissolving a polymer electrolyte, a filler and lithium salt in a solvent, so as to prepare an electrolyte solution; applying the electrolyte solution to the surface of the anode piece or the cathode piece, and performing thermal treatment to obtain an anodepiece or a cathode piece with an electrolyte layer; and finally, assembling the anode piece and the cathode piece in a winding or superposing manner, so as to prepare the all solid state lithium ion battery. The all solid state lithium battery prepared by the method has the advantages of lower interface resistance, higher energy density, high security and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for manufacturing an all-solid-state power lithium-ion battery. Background technique [0002] Lithium-ion power batteries have the characteristics of high energy density, high power, and long life, and are currently the most widely used power source for new energy vehicles. With the continuous promotion of lithium-ion battery new energy vehicles, traditional lithium-ion power batteries have been difficult to meet the requirements of automobiles for safety and cruising range, especially the electrolytes used by current lithium-ion power batteries are mostly flammable and explosive organic Solvent systems, especially in the automotive field, have serious safety hazards; and all-solid-state lithium-ion power batteries made of solid-state electrolytes can greatly improve the safety of power batteries and increase the energy density of batteries. [0003] The contact sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M10/058H01M2220/20H01M2300/0082Y02E60/10Y02P70/50
Inventor 邵乐袁丽只田占元郑勇胡朝文冯皓
Owner SHAANXI COAL & CHEM TECH INST
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