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Composite solid-state electrolyte membrane, preparation method and solid-state lithium battery

A solid electrolyte membrane, solid electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., to improve cycle stability, good interface compatibility, and improve capacity and rate performance.

Inactive Publication Date: 2020-07-17
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first object of the present invention is to provide a composite solid electrolyte membrane with good ionic conductivity, interfacial compatibility, thermal stability and mechanical properties and its preparation method to solve the problem of existing solid polymer electrolytes. Defects of the membrane; the second object of the present invention is to provide a solid lithium battery comprising the composite solid electrolyte membrane, which can effectively improve the cycle stability, rate performance and thermal stability of the solid lithium battery

Method used

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  • Composite solid-state electrolyte membrane, preparation method and solid-state lithium battery
  • Composite solid-state electrolyte membrane, preparation method and solid-state lithium battery
  • Composite solid-state electrolyte membrane, preparation method and solid-state lithium battery

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preparation example Construction

[0041] (1) Preparation of positive pole piece

[0042]Step 1: Add the binder, conductive agent, and positive electrode active material to the NMP solvent in turn for dispersion and stirring to obtain the positive electrode slurry; Step 2: Use a coating machine to coat the positive electrode slurry on the aluminum foil. The drying temperature is 120°C, and the coiled electrode sheet is dried in a vacuum oven at 100°C for 24 hours, and the dried electrode sheet is rolled and punched to obtain the positive electrode sheet;

[0043] (2) Preparation of composite solid electrolyte membrane

[0044] Step 1: Mix organic polymer A, lithium salt, nano-inorganic solid electrolyte and solvent to obtain organic-inorganic composite slurry A, and the solid content of the slurry is 2-8%; Step 2: Mix organic polymer B, lithium salt, nano Inorganic solid electrolyte and solvent are mixed to obtain organic-inorganic composite slurry B, and the solid content of the slurry is 2-8%; Step 3: Coatin...

Embodiment 1

[0049] (1) Preparation of positive pole piece

[0050] Step 1: binder PVDF, conductive agent SuperP, positive electrode active material LiFePO 4 Add it to NMP solvent in order of mass ratio 10:10:80 for dispersion and stirring to obtain positive electrode slurry; Step 2: Coat the positive electrode slurry on the aluminum foil with a coating machine, and the drying temperature of the coating machine is 120°C , the pole piece after winding was dried in a vacuum oven at 100°C for 24 hours, and the dried electrode piece was rolled and punched to obtain the positive pole piece;

[0051] (2) Preparation of composite solid electrolyte membrane

[0052] Step 1: Mix 0.3g polyvinylidene fluoride PVDF, 0.1gLiTFSI, 0.05gLi 7 La 3 Zr 2 o 12 Mix with 10gDMF to obtain organic-inorganic composite slurry A; Step 2: 0.3g polyethylene oxide PEO, 0.1g LiTFSI, 0.05g Li 7 La 3 Zr 2 o 12 Mix with 10g of acetonitrile to obtain organic-inorganic composite slurry B; step 3: apply organic-inorg...

Embodiment 2

[0058] (1) Preparation of positive pole piece

[0059] Step 1: binder PVDF, conductive agent SuperP, positive electrode active material LiNi 0.5 co 0.2 mn 0.3 o 2 Add it to NMP solvent in order of mass ratio 10:10:80 for dispersion and stirring to obtain positive electrode slurry; Step 2: Coat the positive electrode slurry on the aluminum foil with a coating machine, and the drying temperature of the coating machine is 120°C , the pole piece after winding was dried in a vacuum oven at 100°C for 24 hours, and the dried electrode piece was rolled and punched to obtain the positive pole piece;

[0060] (2) Preparation of composite solid electrolyte membrane

[0061] Step 1: Mix 0.3g polyvinylidene fluoride PVDF, 0.1gLiTFSI, 0.05gLi 7 La 3 Zr 2 o 12 Mix with 10gDMF to obtain organic-inorganic composite slurry A; Step 2: 0.3g polyethylene oxide PEO, 0.1g LiTFSI, 0.05g Li 7 La 3 Zr 2 o 12 Mix with 10g of acetonitrile to obtain organic-inorganic composite slurry B; step 3...

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Abstract

The invention discloses a composite solid-state electrolyte membrane, a preparation method and a solid-state lithium battery. The composite solid-state electrolyte membrane comprises a support membrane, an organic-inorganic composite coating A coated on the surface of the positive electrode side of the support membrane, and an organic-inorganic composite coating B coated on the surface of the negative electrode side of the support membrane, wherein the coating A comprises an organic polymer A, a lithium salt and a nano inorganic solid electrolyte, and the organic polymer A is one or more thantwo of polyvinylidene fluoride, a polyvinylidene fluoride copolymer, polyacrylonitrile and polyvinyl chloride; the coating B comprises an organic polymer B, a lithium salt and a nano inorganic solid electrolyte; and the organic polymer B is one or more than two of polyoxyethylene, polypropylene carbonate, polycarbonate and poly trimethylene carbonate. Aiming at different requirements of positive and negative electrode layers in the solid-state lithium battery on the electrolyte membranes, the graphene oxide membrane is used as a support, and the electrolyte membranes containing different polymer groups are designed on the two sides of the graphene oxide membrane respectively so that the comprehensive performance of the battery is further improved.

Description

technical field [0001] The invention relates to the technical field of solid-state lithium batteries, in particular to a composite solid-state electrolyte membrane, a preparation method and a solid-state lithium battery. Background technique [0002] Lithium-ion batteries have been widely used in many aspects of the national economy. However, as consumer electronics and electric vehicles continue to increase the energy density and safety performance requirements of lithium-ion batteries, it is imminent to develop high-performance lithium-ion batteries that take into account both performances. However, due to the use of liquid electrolyte in traditional liquid lithium-ion batteries, there are safety hazards such as easy leakage, easy volatilization, and easy combustion, and the safety needs to be further improved. At the same time, the energy density of liquid lithium batteries is approaching its upper limit. Therefore, realizing the transition from liquid lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): H01M10/0562B82Y30/00
CPCB82Y30/00H01M10/0562H01M2300/0068Y02E60/10
Inventor 朱蕾颜廷房贾荻吴勇民汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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