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High-voltage polymer electrolyte and preparation method of solid-state battery thereof

A solid-state battery and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve problems such as potential safety hazards, unstable cycle performance, and high pressure resistance

Pending Publication Date: 2020-10-23
TIANJIN SPACE POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polymer solid-state electrolyte membrane used in the current all-solid-state lithium battery can solve the safety hazards of the traditional liquid electrolyte, it still has problems such as not being able to withstand high voltage and unstable cycle performance.

Method used

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  • High-voltage polymer electrolyte and preparation method of solid-state battery thereof
  • High-voltage polymer electrolyte and preparation method of solid-state battery thereof
  • High-voltage polymer electrolyte and preparation method of solid-state battery thereof

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preparation example Construction

[0035]Embodiments of the present invention provide a method for preparing a high-voltage polymer electrolyte, comprising the following steps:

[0036] (1) Dissolving the polymer in the solvent at room temperature or by heating, the temperature during heating is 25-120°C;

[0037] (2) Dissolving a certain proportion of lithium salt in the above mixture, the quality of the lithium salt accounts for 100% to 200% of the polymer mass;

[0038] (3) Add the high-voltage additive to the mixture, stir evenly, and then cast the mixture to form a film or coat it on the diaphragm, heat and dry it with air blast to obtain a high-voltage resistant composite high-voltage polymer electrolyte; wherein, the high-voltage additive The mass of the polymer accounts for 1% to 10% of the polymer mass.

[0039] Preferably, in the step (3), after adding the high-voltage additive, an inorganic filler can be added, and the mixture is stirred for 5-24 hours; the mass of the inorganic filler accounts for ...

Embodiment 1

[0054] Preparation of high-voltage polymer electrolyte: Dissolve 4g polypropylene carbonate (PPC) and 0.8g polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in NMP, and heat to dissolve at 60°C. Add 6.5 g of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) into the mixed solution, and stir for 1 h. Add 0.1g of tris(hexafluoro-isopropyl) phosphate (HFiP) into the mixed solution, stir for 12 hours, pour the mixed solution on a polytetrafluoroethylene board to form a film, blow air, heat and dry, and obtain a high-voltage resistant composite high-voltage polymer electrolyte membrane.

[0055] Preparation of positive and negative pole pieces: Mix 9g LiFePO4 with 0.5g conductive agent SP, add 0.5g PVDF and 40ml NMP, stir for 3 hours to obtain positive electrode slurry, apply on aluminum foil, dry at 100°C for 1 hour, roll press, divide Cut to prepare the positive electrode sheet. Mix 9g of graphite with 0.5g of conductive agent SP, add 0.5g of PVDF and 40ml of NMP, stir fo...

Embodiment 2

[0058] Preparation of high-voltage polymer electrolyte: Dissolve 4g polypropylene carbonate (PPC) and 0.8g polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in NMP, and heat to dissolve at 60°C. Add 6.5 g of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) into the mixed solution, and stir for 1 h. Add 0.1g tris(trimethylsilane) borate (TMSB) into the mixed solution, then add 0.48g inorganic filler aluminum oxide (Al2O3), stir for 12h, pour the mixed solution on a polytetrafluoroethylene plate to form The membrane is heated and dried by blowing air to obtain a high-voltage resistant composite high-voltage polymer electrolyte membrane.

[0059] Preparation of positive and negative electrodes: Mix 9g LiCoO2 with 0.5g conductive agent SP, add 0.5g PVDF and 40ml NMP, stir for 3 hours to obtain positive electrode slurry, apply on aluminum foil, dry at 100°C for 1 hour, roll press, Slitting and preparing positive pole pieces. Mix 9g of graphite with 0.5g of conductive agent...

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Abstract

The invention relates to a high-voltage polymer electrolyte and a preparation method of a solid-state battery thereof, and the preparation method of the high-voltage polymer electrolyte comprises thefollowing steps: (1) dissolving a polymer in a solvent at normal temperature or by heating at the temperature of 25-120 DEG C; (2) dissolving a certain proportion of lithium salt into the mixture, wherein the mass of the lithium salt accounts for 100%-200% of the mass of the polymer; (3) adding a high-voltage additive into the mixture, uniformly stirring, then pouring the mixture into a membrane or coating the membrane with the mixture, and carrying out blast heating and drying to obtain a high-voltage-resistant composite high-voltage polymer electrolyte membrane, wherein the mass of the high-voltage additive accounts for 1%-10% of the mass of the polymer. The high-voltage polymer electrolyte is prepared by adding the high-voltage-resistant additive, has relatively low interface impedanceand relatively high ionic conductivity, and is beneficial to improving the energy density, the power density and the safety of the solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of secondary lithium ion batteries, in particular to a high-voltage polymer electrolyte and a preparation method of a solid-state battery. Background technique [0002] Liquid lithium batteries have frequent safety accidents such as fire and explosion in the fields of 3C and power batteries, which will become the biggest obstacle in the development of liquid lithium batteries in the future. The solid-state battery replaces the flammable organic liquid electrolyte with a non-flammable solid electrolyte, which greatly improves the safety of the battery system. At the same time, it can better adapt to high-energy positive and negative electrodes and reduce the weight of the system to achieve a simultaneous increase in energy density. Among all kinds of new battery systems, solid-state batteries are the next-generation technology closest to industrialization, which has become the consensus of the industry and th...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525H01M10/42
CPCH01M10/0565H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 杜建国郑智勇张俊洋张健
Owner TIANJIN SPACE POWER TECH CO LTD
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