Gel polymer electrolyte, polymer lithium ion battery and making method of polymer lithium ion battery

A gel polymer and lithium-ion battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc., can solve problems such as low reaction conversion rate, battery performance degradation, uncontrollable polymerization, etc., to achieve reaction conversion High efficiency, inhibition of lithium dendrites, and low cost

Active Publication Date: 2014-03-12
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of potential safety hazards, environmental pollution, and uncontrollable polymerization in the in-situ polymerization process in the polymer lithium-ion battery in the prior art, and the battery performance is deteriorated due to low reaction conversion rate, and provides a battery with greatly improved safety, Stable electrochemical performance, high-voltage-resistant gel polymer electrolyte, greatly improved safety, no liquid leakage, good cycle stability polymer lithium ion battery and preparation method thereof

Method used

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  • Gel polymer electrolyte, polymer lithium ion battery and making method of polymer lithium ion battery
  • Gel polymer electrolyte, polymer lithium ion battery and making method of polymer lithium ion battery
  • Gel polymer electrolyte, polymer lithium ion battery and making method of polymer lithium ion battery

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preparation example Construction

[0037] In the preparation method of the polymer lithium ion battery provided by the present invention, since the polymer film has completed self-crosslinking before being assembled into the battery (that is, it has a three-dimensional cross-linked network structure at this time), only the polymer film occurs after adding the electrolyte. The absorption of the electrolyte and the process of the three-dimensional cross-linked network structure being swollen by the electrolyte to form a gel polymer electrolyte, the process is simple and controllable, and can effectively ensure that the polymer is prepared without leakage, with greatly improved safety and good cycle stability. of lithium-ion batteries.

[0038] According to the preparation method of the present invention, the polymer mixture is first coated on the separator, the positive electrode or the negative electrode, and then the separator, the positive electrode or the negative electrode coated with the polymer mixture is t...

Embodiment 1

[0042] (1) Mix the pure acrylic emulsion with a glass transition temperature of 0 °C and water in a volume ratio of 100:10; then add 0.1% ammonia water (based on the total mass of the pure acrylic emulsion and water), and the ammonia water concentration is 25wt%, After mixing uniformly under magnetic stirring, a polymer mixed liquid was obtained.

[0043] (2) The polymer mixture was coated on both sides of the PE diaphragm by a film coating machine, and baked at 85° C. for 10 h to obtain a composite diaphragm Ma1 with a polymer film on the surface. The thickness of the polymer film on the surface was 19.3 μm.

[0044] (3) The polymer mixture was cast on a PTFE plate, and baked at 85° C. for 10 hours to obtain a test film Mb1 with a polymer film on the surface.

[0045] (4) The composite membrane Ma1 was cut into discs with a diameter of 17 mm, dried at 30 °C for 12 h, and then quickly transferred to a glove box filled with argon. LiCoO 2 , binder and carbon black in a mass r...

Embodiment 2

[0047] (1) Mix the pure acrylic emulsion with a glass transition temperature of 15 °C and water in a volume ratio of 100:20, then add 0.2% ammonia water (based on the total mass of the pure acrylic emulsion and water), and the ammonia water concentration is 25wt%, After mixing uniformly under magnetic stirring, a polymer mixed liquid was obtained.

[0048] (2) The polymer mixture was coated on both sides of the PE diaphragm by a film coating machine, and baked at 75°C for 10 hours to obtain a composite diaphragm Ma2 with a polymer film on the surface, and the thickness of the polymer film on the surface was 14.2 μm.

[0049] (3) The polymer mixture was cast on a PTFE plate and baked at 75° C. for 10 h to obtain a test film Mb2 with a polymer film on the surface.

[0050] (4) The same steps as in Example 1 (4) were used to prepare the polymer lithium ion battery S20, except that Ma1 in Example 1 was replaced by a composite separator Ma2.

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Abstract

The invention provides a gel polymer electrolyte. A polymer membrane absorbs an electrolyte and swells to form the gel polymer electrolyte, and the polymer membrane is formed through thermocuring self-crosslinking of a liquid polymer mixture; and the liquid polymer mixture contains a pure acrylic emulsion, water and ammonia water, and the glass transition temperature of the pure acrylic emulsion is -30 - 50 DEG C. The invention also provides a polymer lithium ion battery adopting the gel polymer electrolyte, and a making method of the polymer lithium ion battery. The gel polymer electrolyte has the advantages of substantial improvement of the security, stable electrochemical performances and high voltage resistance, can realize the inhibition of the generation of lithium dendrites, no liquid leakage, substantial improvement of the security and good cycle stability when the gel polymer electrolyte is used in the polymer lithium ion battery, and is more suitable for lithium ion power batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a gel polymer electrolyte and a polymer lithium ion battery. Background technique [0002] Polymer lithium ion battery is a new generation of high specific energy secondary battery system developed on the basis of liquid lithium ion battery. The general structure of a polymer lithium ion battery includes a positive electrode, a negative electrode, and a polymer electrolyte between the positive electrode and the negative electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material, and the negative electrode includes a negative electrode current collector and a negative electrode active material. The positive electrode active material and The negative electrode active material is disposed opposite to each other, and is contained in the battery case together with the polymer electrolyte. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/00C08F220/18Y02E60/122H01M10/0525H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y10T29/4911Y02P70/50H01M2300/0082
Inventor 单军刘荣华金丽娜
Owner BYD CO LTD
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