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Polymer electrolyte and lithium ion battery comprising same

A polymer and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of difficult processing, oxidative decomposition of electrolytes, and inability to apply high energy density battery systems.

Active Publication Date: 2020-05-12
浙江冠宇电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as poor uniformity and processing difficulties in semi-solid electrolytes.
[0004] In order to improve the performance of polymer electrolytes, the Chinese invention patent application with application number 201710386736.0 discloses a gel electrolyte containing cyclic ethers. This patent can obtain gel electrolytes with adjustable strength, but the system uses cyclic ethers Structure, poor high voltage resistance, in lithium cobaltate and ternary systems, it will cause electrolyte oxidation and decomposition, and cannot be used in high energy density battery systems
The Chinese invention patent application with the application number 201811419047.6 discloses the preparation of cross-linked polymer electrolyte and the preparation of semi-solid polymer electrolyte. Cross-linked polymer electrolyte, but in this patent, it is necessary to prepare the cross-linked polymer electrolyte first, and then assemble the battery, and there are problems such as cumbersome processing. Secondly, the cross-linking agent used in this patent is a dienyl cyclic borate structure. Reagent costs are high, and it is difficult to meet industrial production

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  • Polymer electrolyte and lithium ion battery comprising same
  • Polymer electrolyte and lithium ion battery comprising same
  • Polymer electrolyte and lithium ion battery comprising same

Examples

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Embodiment 1

[0071] This embodiment discloses a method for preparing a polymer electrolyte, including:

[0072] (1) In parts by weight, 20 parts of polymethyl methacrylate and 10 parts of polymethyl acrylate are added to 5 parts of allyl methyl carbonate, 25 parts of ethylene carbonate, 5 parts of allyl di Glycol dicarbonate, 3 parts propylene heptanoate, 4 parts itaconic anhydride, 8 parts propylene hexanoate, 3 parts dipropylene phthalate, 6 parts 2-methacrylic anhydride, 6 parts allyl acetate ester, 2 parts of 2-vinyl-4,4-dimethyl-2-oxazolin-5-one, and 3 parts of methacryl alcohol acetate reagent, and after mixing evenly, A system is obtained, in which The mass proportion of the functional polymer (i.e. 20 parts of polymethyl methacrylate and 10 parts of polymethyl acrylate) is 30%;

[0073] (2) After mixing 100 parts of system A and 0.01 part of triallyl borate functional additive, add lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ) (mass ratio is 1:5), until t...

Embodiment 2

[0076] This embodiment discloses a preparation method of a lithium ion battery, comprising:

[0077] S1: In parts by weight, add 0.01 part of polystyrene to 2 parts of diallyl carbonate, 1 part of allyl trifluoroacetate, and 2 parts of propylene acetoacetate reagent, and mix uniformly to obtain system A, wherein The mass proportion of functional polymer (ie 0.01 part of polystyrene) in system A is 0.2%;

[0078] S2: After mixing 50 parts of system A, 6 parts of allyl pentafluorobenzene, and 6.5 parts of 1,2,2-trifluorovinyltriphenylsilane, add lithium hexafluorophosphate (LiPF 6 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium bisoxalate borate (LiBOB) (mass ratio is 5:2:1), until the lithium salt is fully dissolved and the concentration of the lithium salt in the mixed solution is 1.1mol / L;

[0079] S3: adding the mixed solution into the battery cell, performing in-situ polymerization and bonding after hot pressing at 80° C. to obtain ...

Embodiment 3

[0086] This embodiment discloses a method for preparing a polymer electrolyte, including:

[0087](1) Add 2 parts of polyacrylonitrile, 10 parts of polymethyl methacrylate, 6 parts of polyvinyl acetate, 2 parts of polyvinylidene fluoride-hexafluoropropylene to 2 parts of diallyl pyrocarbonate, 10 parts Ethylene carbonate, 4 parts of allyl phenyl carbonate, 20 parts of 2-methenylbutyrolactone, 20 parts of dimethylaminoethyl acrylate, 4 parts of hexafluoroisopropyl methacrylate, 1 part of methyl 1H, 1H-perfluorooctyl acrylate, 5 parts of trifluoroethyl methacrylate, 4 parts of isooctyl acrylate, and 10 parts of 4-hydroxybutyl acrylate reagent, and mixed uniformly to obtain A system, wherein The mass proportion of functional polymers in system A (i.e. 2 parts of polyacrylonitrile, 10 parts of polymethyl methacrylate, 6 parts of polyvinyl acetate and 2 parts of polyvinylidene fluoride-hexafluoropropylene) is 20%;

[0088] (2) 90 parts of system A, 2 parts of trans-3-phenylpropen-...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a polymer electrolyte and a lithium ion battery comprising the same. The preparation method of the polymer electrolyte comprises the following steps: (1) dissolving a functional polymer in an organic solvent, and uniformly mixing to obtain a system A, wherein the mass proportion of the functional polymer in the system A is 0.2-30%; (2) uniformly mixing the system A, a lithium salt and a functional additive to obtain a mixed solution; and (3) carrying out in-situ polymerization on the mixed solution to obtain the polymer electrolyte. The polymer electrolyte has good affinity with anions of the lithium salt, has high conductivity, and greatly improves the performances of a semi-solid battery. The semi-solid state lithium ion battery prepared based on an existing lithium ion battery processing technology has good processing performances and electrochemical performances, and has a certain application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a polymer electrolyte and a lithium ion battery including the polymer electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in the fields of power, digital, and energy storage. However, lithium-ion batteries are prone to thermal runaway during use, resulting in leakage or combustion of flammable and volatile electrolytes, resulting in safety issues. [0003] In order to improve the safety of lithium-ion batteries, currently there are mainly technical methods such as PTC coating, heat-blocking diaphragm, and heat-blocking tabs in liquid lithium-ion batteries, but the effect is limited and the safety of lithium-ion batteries has not been fundamentally improved. safe question. Solid electrolytes and semi-solid electrolytes are expected to fundamentally solve the safety problem of lithium ions. At present, solid electrolytes mainly incl...

Claims

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Application Information

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IPC IPC(8): C08F265/04C08F257/02C08F230/06C08F212/14C08F265/08H01M10/0525H01M10/0565
CPCC08F265/04C08F257/02C08F265/08H01M10/0565H01M10/0525C08F230/06C08F212/14C08L25/06H01M2300/0082H01M2300/0085C08L51/003C08F218/24C08F218/04C08F220/08C08K3/32C08F220/34C08F220/22C08F220/20C08F220/1808C08F8/20C08F212/10C08F214/282C08F220/14
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner 浙江冠宇电池有限公司
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