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Boron-containing plastic crystal polymer and preparation method and application thereof

A technology of polymers and mixtures, applied in the field of boron-containing plastic crystal polymers and its preparation, can solve the problems of high electrode/electrolyte interface impedance, low room temperature ion conductivity, high working temperature, etc., and achieve good rate performance and cycle stability Sex, high sodium ion migration number, and the effect of reducing interfacial impedance

Active Publication Date: 2019-05-21
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a boron-containing electrolyte for the defects of low room temperature ionic conductivity of polymer solid electrolytes in...

Method used

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  • Boron-containing plastic crystal polymer and preparation method and application thereof
  • Boron-containing plastic crystal polymer and preparation method and application thereof
  • Boron-containing plastic crystal polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation of boron-containing ternary crosslinker (B-crosslinker)

[0050] Measure 2.6mL of trimethyl borate and 8.5mL of hydroxyethyl methacrylate and dissolve in 25mL of anhydrous acetonitrile, and stir the mixture at 50°C for 3-4 hours under the protection of an inert atmosphere, and then raise the temperature to 70°C , continue to stir for 3 to 5 hours, and remove the methanol produced by the reaction to ensure that the reaction is carried out thoroughly. After the reaction, unreacted trimethyl borate and residual solvent were distilled off under reduced pressure, and vacuum-dried for 48 hours. The obtained light yellow liquid product (that is, B-crosslinker) is sealed and stored in a glove box to prevent its hydrolysis (for specific preparation methods, please refer to the literature: ACS Appl. Mater. Interfaces 2016, 8, 27740-27752).

[0051] The boron-containing ternary crosslinker (B-crosslinker) used in the following examples and comparative examples were...

Embodiment 2

[0063] 1. Preparation of all-solid plastic crystal polymer electrolyte membrane

[0064] Take a certain amount of sodium trifluoromethanesulfonate (NaOTf) and join in succinonitrile (SN), heated and stirred to form transparent and uniform NaOTf salt solution 1 of succinonitrile, NaOTf concentration in SN in solution 1 is 1.25mol / L. Then add a certain amount of B-crosslinker (n=6) crosslinking agent to solution 1, and add a certain mass fraction of 184 photoinitiator to the system at the same time, continue to stir to form a uniform solution 2, in solution 2, add The mass fraction of B-crosslinker (n=6) is 30wt.%, and the content of photoinitiator 184 is 5wt.% of the mass of active monomer B-crosslinker (n=6). Then, inject the mixed solution into the polyacrylonitrile non-woven fabric. After the solution is completely immersed, the non-woven fabric containing the mixed solution is sandwiched between two clean glass sheets, and the film is cured by ultraviolet curing technolo...

Embodiment 3

[0074] 1. Preparation of all-solid plastic crystal polymer electrolyte membrane

[0075] Weigh a certain amount of bis(trifluoromethylsulfonimide) sodium (NaTFSI) and add it to succinonitrile (SN), heat and stir until NaTFSI salt solution 1 of transparent and uniform succinonitrile is formed, NaTFSI in solution 1 The concentration in SN is 0.25mol / L. Then add a certain amount of B-crosslinker (n=20) crosslinking agent to solution 1, and add a certain mass fraction of 1173 photoinitiator to the system at the same time, continue to stir so that a uniform solution 2 is formed, in solution 2, add The mass fraction of B-crosslinker (n=20) is 8wt.%, and the content of photoinitiator 1173 is 0.5wt.% of the mass of active monomer B-crosslinker (n=20). Then, the mixed solution is injected into the cellulose membrane support material, and after the solution is completely immersed, the non-woven fabric containing the mixed solution is sandwiched between two clean glass sheets, and the...

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Abstract

The invention discloses a boron-containing plastic crystal polymer and a preparation method and application thereof. The preparation method includes the following step of curing a mixture containing plastic crystals, metal salt, monomers and a photoinitiator to obtain the boron-containing plastic crystal polymer. The plastic crystal polymer prepared by the method can be used as an all-solid electrolyte, no liquid additive is added, and the obtained electrolyte room temperature ion conductivity can be as high as 3.6*10<-4> S/cm; and meanwhile, the high sodium ion migration number and the wide electrochemical window are be exhibited and can be as high as 4.7 V. In addition, in order to construct a stable electrode/electrolyte interface to reduce the interface impedance, a composite positiveelectrode and negative electrode are prepared for positive and negative electrode modification of a sodium ion battery, and the finally-assembled all-solid sodium ion battery exhibits the good rate capability and the cycle stability at room temperature, the specific discharge capacity at room temperature can be as high as 104.8 mAh/g, and the capacity retention rate is 85.4% after circulation by 80 circles.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a boron-containing plastic crystal polymer and a preparation method and application thereof. Background technique [0002] Due to the advantages of long cycle life, high energy density, no memory effect, fast charge and discharge speed, and environmental friendliness, lithium batteries have achieved rapid development in the field of energy storage in the past two decades and have been widely used In various electronic mobile devices, electric vehicles and other fields. However, limited lithium resources and increasing lithium prices will also become important factors limiting the further development of lithium-ion batteries. Compared with the scarce lithium element, the abundant sodium element has a wide range of sources, low cost, and has similar chemical and physical properties to lithium, which makes sodium batteries and sodium-ion batteries become research hots...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525C08F130/06C08F299/02
CPCH01M10/0565C08F299/02C08F130/06Y02E60/10H01M10/0567C08F2/48C08L43/00C08K3/16C08K5/42C08F2/44H01M4/0416
Inventor 马紫峰陈苏莉车海英冯凡杨馨蓉
Owner 浙江钠创新能源有限公司
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