Polymer electrolyte, its preparation method and battery comprising the same

A polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of low mechanical strength and achieve high mechanical strength, enhanced mechanical strength, and good flexibility

Active Publication Date: 2014-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to overcome the defects of low mechanical strength of polymer electrolytes in the prior art, and provides a kind of high mechanical strength, high ionic conductivity, good therma

Method used

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  • Polymer electrolyte, its preparation method and battery comprising the same
  • Polymer electrolyte, its preparation method and battery comprising the same
  • Polymer electrolyte, its preparation method and battery comprising the same

Examples

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preparation example Construction

[0031] The present invention also provides a method for preparing a polymer electrolyte, wherein the method includes: adsorbing a solution containing a polymer capable of complexing lithium ions and a lithium salt on the electrospun fiber film, and then removing the solvent to obtain the adsorbed ion The supporting phase for the conductive phase.

[0032] Among them, the method of adsorbing a solution containing a polymer capable of complexing lithium ions and a lithium salt on the electrospun fiber film can adopt various methods known in the art, such as dipping, coating, spraying, etc., preferably, Adsorbing a solution containing a polymer capable of complexing lithium ions and a lithium salt on the electrospun fiber film includes dropping a solution containing a polymer capable of complexing lithium ions and a lithium salt onto the electrospun fiber film, and the method is simple It is easy to operate, and the prepared polymer electrolyte is more uniform and filled better, ...

Embodiment 1

[0044] This example is used to illustrate the polymer electrolyte provided by the present invention and its preparation method.

[0045] 1. Preparation of electrospun fiber film

[0046] (1) at V 丙酮 : V N,N-二甲基甲酰胺 =2:8 (6 mL of acetone, 14 mL of N,N-dimethylformamide) was added PVdF ( M w 370 000 g / mol) was stirred and dissolved, and a support phase polymer solution with a mass concentration of 17 wt% was prepared.

[0047] (2) Add the above-mentioned support phase polymer solution into a 10 mL syringe, insert a needle with a diameter of 0.8 mm, and move the needle at a speed of 6 mm / s, and use a syringe pump to propel the polymer solution at an injection rate of 0.8 mL / s h, A DC high-voltage generator is used as a device to generate a high-voltage electrostatic field. A layer of aluminum foil is wrapped on the receiving plate of the cylindrical drum. The voltage is adjusted according to the polymer concentration and viscosity of the support phase. The voltage is 12 kV, a...

Embodiment 2

[0054] This example is used to illustrate the polymer electrolyte provided by the present invention and its preparation method.

[0055] 1. Preparation of electrospun fiber film

[0056] (1) at V 丙酮 : V N,N-二甲基乙酰胺 =2:8 (6 mL of acetone, 14 mL of N,N-dimethylacetamide) was added PVdF ( M w 625 000 g / mol) was stirred and dissolved, and a support phase polymer solution with a mass concentration of 12 wt% was prepared.

[0057] (2) Add the above-mentioned support phase polymer solution into a 10 mL syringe, insert a needle with a diameter of 0.8 mm, and move the needle at a speed of 6 mm / s, and use a syringe pump to propel the polymer solution at an injection rate of 1.0 mL / s h, A DC high-voltage generator is used as a device to generate a high-voltage electrostatic field. A layer of aluminum foil is wrapped on the receiving plate of the cylindrical drum. The voltage is adjusted according to the polymer concentration and viscosity of the support phase. The voltage is 12 kV, a...

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Abstract

The invention provides a polymer electrolyte, its preparation method and a battery comprising the polymer electrolyte. The polymer electrolyte contains a stance phase and an ionic conductive phase adsorbed on the stance phase. The stance phase is an electrostatic spinning fiber film, and the ionic conductive phase includes a polymer able to undergo complexation with lithium ions and a lithium salt. The polymer able to undergo complexation with lithium ions contains an ether oxygen functional group. A bi-continuous phase composite electrolyte film characterized by high mechanical strength, good flexibility, high ionic conductivity, good thermal stability, high interface stability and good electrochemical stability can be obtained, and the preparation process is simple and is low in cost. The prepared material can be widely used in mobile phones, notebook computers and other mobile devices, as well as electric vehicles and other fields, and has strong practical significance to development of the battery industry. The polymer battery involved in the invention is different from liquid or gel state batteries, is free of plasticizer, does not cause leakage and other potential safety hazards, so that it can be used in high temperature environment, and does not have combustion, explosion and other hidden dangers.

Description

technical field [0001] The invention relates to a polymer electrolyte, a preparation method of the polymer electrolyte, and a battery including the polymer electrolyte. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries, which have the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. Widely used in electric tools, electric vehicles and other fields. The existing lithium-ion batteries used on a large scale are generally liquid lithium-ion batteries, that is, the ionic conductive material is generally a liquid electrolyte, which gradually exposes dendrite growth, leakage, and poor safety during the application of lithium batteries. question. Existing research includes polymer electrolytes. Compared with traditional organic electrolytes, polymer films have strong plasticity and can be made into large-area ultra-thin films to avoid leakage, and can be made into d...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0565H01M10/058H01M10/0525H01M50/403H01M50/409H01M50/417
CPCY02E60/122H01M10/0525H01M10/0565H01M10/058H01M50/411H01M50/44Y02E60/10Y02P70/50
Inventor 刘荣华单军
Owner BYD CO LTD
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