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CN-121983678-A - Preparation process of high-safety wearable flexible battery and application of high-safety wearable flexible battery to electronic equipment

CN121983678ACN 121983678 ACN121983678 ACN 121983678ACN-121983678-A

Abstract

The invention provides a preparation process of a high-safety wearable flexible battery and application of the high-safety wearable flexible battery to electronic equipment, wherein a flexible positive electrode, a diaphragm, a modified gel electrolyte and a flexible negative electrode are sequentially laminated or wound and are put into a flexible battery shell, and the high-safety wearable flexible battery is prepared after packaging, wherein the modified gel electrolyte comprises a blending matrix, a dynamic cross-linking agent, a nano filler, lithium salt and a plasticizer, the blending matrix comprises a carboxylic betaine methacrylate-acrylamide copolymer and a polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer, the dynamic cross-linking agent is guanidinomethyl acrylate, the nano filler is povidone modified zirconia, and the plasticizer comprises polyethylene glycol monomethyl ether and 1-butyl-3-methylimidazole tetrafluoroborate. The modified gel electrolyte used by the invention has no leakage risk, has the capability of resisting lithium dendrite, is stable at high temperature, has no hidden danger of combustion and explosion, and meets the wearing and close-fitting use requirements.

Inventors

  • CHEN DEQIANG
  • WEI MIN
  • LIAO ZHONGCAI
  • FANG YANWEN

Assignees

  • 和也健康科技有限公司

Dates

Publication Date
20260505
Application Date
20260127

Claims (10)

  1. 1. A preparation process of a high-safety wearable flexible battery is characterized in that a flexible positive electrode, a diaphragm, a modified gel electrolyte and a flexible negative electrode are sequentially laminated or wound, and are put into a flexible battery shell, and the high-safety wearable flexible battery is prepared after packaging; The modified gel electrolyte comprises a blending matrix, a dynamic cross-linking agent, nano-fillers, lithium salt and a plasticizer, wherein the blending matrix comprises a carboxylic acid betaine methacrylate-acrylamide copolymer and a polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer, the dynamic cross-linking agent is guanidinomethyl acrylate, the nano-fillers are povidone modified zirconia, and the plasticizer comprises polyethylene glycol monomethyl ether and 1-butyl-3-methylimidazole tetrafluoroborate.
  2. 2. The manufacturing process of claim 1, wherein the modified gel electrolyte satisfies at least one of the following conditions: (1) The addition amount of the dynamic cross-linking agent is 1% -3% of the mass of the blending matrix; (2) The addition amount of the nano filler is 5% -8% of the mass of the blending matrix; (3) The lithium salt comprises lithium bis (fluorosulfonyl imide) and lithium bis (fluoxalato) borate; (4) The mass ratio of the dynamic cross-linking agent to the nano filler is 1 (5-8); (5) The addition amount of the plasticizer is 50% -120% of the mass of the blending matrix.
  3. 3. The preparation process according to claim 1, wherein the addition amount of the lithium salt is 15% -30% of the mass of the blending matrix.
  4. 4. The process according to claim 3, wherein the mass ratio of lithium difluorosulfimide to lithium difluorooxalato borate in the lithium salt is (6-14): 1.
  5. 5. The process of claim 1, wherein the flexible positive electrode comprises a flexible positive electrode current collector and a positive electrode material coated on the surface of the flexible positive electrode current collector, and the flexible positive electrode current collector comprises a first base film layer and first metal layers positioned on two sides of the base film layer.
  6. 6. The process of claim 5, wherein the flexible positive current collector satisfies at least one of the following conditions: (1) The material of the first base film layer comprises one or more of polypropylene, polyethylene and polyethylene terephthalate; (2) The thickness of the first base film layer is 2-5 mu m; (3) The material of the first metal layer comprises aluminum or aluminum alloy; (4) The thickness of the first metal layer is 0.5-3 μm.
  7. 7. The manufacturing process of claim 1, wherein the flexible negative electrode comprises a flexible negative electrode current collector and a negative electrode material coated on the surface of the flexible negative electrode current collector, and the flexible negative electrode current collector comprises a second base film layer and second metal layers positioned on two sides of the second base film layer.
  8. 8. The manufacturing process of claim 7, wherein the flexible anode current collector satisfies at least one of the following conditions: (1) The material of the second base film layer comprises one or more of polypropylene, polyethylene and polyethylene terephthalate; (2) The thickness of the second base film layer is 2-5 mu m; (3) The material of the second metal layer comprises copper or copper alloy; (4) The thickness of the second metal layer is 0.5-3 μm.
  9. 9. The process of claim 1, wherein the separator is a polyolefin porous membrane or a polyamide porous membrane.
  10. 10. Use of a high safety wearable flexible battery made by the manufacturing process of any one of claims 1-9 in an electronic device.

Description

Preparation process of high-safety wearable flexible battery and application of high-safety wearable flexible battery to electronic equipment Technical Field The invention relates to the technical field of lithium ion battery preparation, in particular to a preparation process of a high-safety wearable flexible battery and application of the high-safety wearable flexible battery to electronic equipment. Background Along with the rapid popularization of flexible wearable electronic equipment (such as intelligent bracelets, flexible watches, wearable medical monitoring equipment, intelligent clothes and the like), strict requirements are put forward on the flexibility suitability and the safety reliability of the matched energy storage battery. The wearable battery needs to be used closely for a long time, faces dynamic scenes such as frequent bending and extrusion, and the traditional lithium ion battery cannot meet the requirements of the existing wearable equipment. Particularly, the traditional lithium battery has outstanding potential safety hazards, and the flexibility and the electrical property of the traditional lithium battery are difficult to balance. The traditional liquid electrolyte is easy to leak and burn, is extremely easy to cause combustion and explosion risks once the battery is damaged or overheated, and seriously threatens the safety of users, meanwhile, lithium dendrites are easy to grow in the cycling process of the lithium metal anode, and the lithium metal anode pierces a diaphragm to cause short circuit, so that the safety risk is further aggravated. The existing solid or quasi-solid battery has the problems of liquid leakage, but the dendrite resistance and the thermal stability are still required to be improved, the traditional battery current collector is mostly rigid metal foil, is easy to deform and break after bending, and breaks the interface between an electrode and an electrolyte, so that the battery capacity is fast attenuated, and the gel electrolyte has certain flexibility, but has insufficient mechanical strength, is easy to crack after frequent bending, and has insufficient self-healing capacity, so that the long-term dynamic use requirement cannot be met. Therefore, developing a wearable flexible battery preparation process which has high safety, excellent flexibility and long cycle life and is compatible with the process becomes a technical problem to be solved in the current industry. Disclosure of Invention Aiming at the problems of insufficient safety, unbalanced flexibility and performance of the existing wearable flexible battery, the invention provides a preparation process of the high-safety wearable flexible battery and the high-safety wearable flexible battery so as to meet the requirements of the existing wearable equipment. In order to achieve the above purpose, on the one hand, the invention innovatively provides a preparation process of the high-safety wearable flexible battery, wherein a flexible positive electrode, a diaphragm, a modified gel electrolyte and a flexible negative electrode are sequentially laminated or wound, are arranged in a flexible battery shell, and are packaged to prepare the high-safety wearable flexible battery; The modified gel electrolyte comprises a blending matrix, a dynamic cross-linking agent, nano-fillers, lithium salt and a plasticizer, wherein the blending matrix comprises a carboxylic acid betaine methacrylate-acrylamide copolymer and a polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer, the dynamic cross-linking agent is guanidinomethyl acrylate, the nano-fillers are povidone modified zirconia, and the plasticizer comprises polyethylene glycol monomethyl ether and 1-butyl-3-methylimidazole tetrafluoroborate. Specifically, in the modified gel electrolyte used in the invention, the blending substrate comprises a carboxylic acid betaine methacrylate-acrylamide copolymer (CBMA-AM) and a polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer (PVDF-HFBA), wherein the carboxyl group of the carboxylic acid betaine methacrylate-acrylamide copolymer and fluorine atoms of the polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer form F.H-O hydrogen bonds, the crystallization structure of the polyvinylidene fluoride-perfluorohexyl ethyl acrylate copolymer can be destroyed, the crystallinity is reduced, the amorphous area ratio distribution is increased to improve the efficiency of lithium ion transmission, the dynamic cross-linking agent Guanidylmethacrylate (GMA) contains guanidyl, the molecular structure of the dynamic cross-linking agent Guanidyl Methacrylate (GMA) contains three amino groups (-NH 2) and an imino group (=NH), and the dynamic cross-linking agent Guanidyl Methacrylate (GMA) can be connected with carboxyl groups (-COOH) of the blending substrate CBMA-AM, The fluorine atoms (-F) and self molecules of PVDF-HFBA form a five-fold reversible hydrogen bond network, and the reversible hy