Gel electrolyte capable of improving cathode/electrolyte interface stability and preparation method thereof

A gel electrolyte and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems that high liquid absorption rate and structural stability cannot be balanced, and the work has not yet been explored, so as to improve interface compatibility, increase liquid absorption rate, and stabilize The effect of the interface

Inactive Publication Date: 2018-09-28
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, gel electrolytes still have the problem of high liquid absorption and structural stability.
In addition, the gel electrolyte is applied to high-nickel cathode materials, and the in-situ protection of the surface of the pole piece is carried out by using the specific groups on it and the surface of the pole piece. The work in this area has not yet been explored.

Method used

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  • Gel electrolyte capable of improving cathode/electrolyte interface stability and preparation method thereof
  • Gel electrolyte capable of improving cathode/electrolyte interface stability and preparation method thereof
  • Gel electrolyte capable of improving cathode/electrolyte interface stability and preparation method thereof

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preparation example Construction

[0025] A typical embodiment of the present invention provides a method for preparing a gel electrolyte that improves the stability of the positive electrode / electrolyte interface, including:

[0026] Step (1), preparation of the polymer membrane: the electrolyte matrix material with a mass ratio of 3:7−9:1 and cellulose acetate (CA) were stirred and dissolved in an organic solvent at 40−90°C, and after 4−12 hours A uniform slurry is obtained, and the slurry is made into a polymer film by electrospinning;

[0027] Step (2), sodium alginate (SA) modified polymer membrane: the polymer membrane prepared in step (1) was infiltrated with a mixed solvent of ethanol and water with a volume ratio of 1:9−6:4, and then dissolved in alginic acid After soaking in sodium aqueous solution for 6-24 hours, take it out, and dry it at 50-80°C to obtain the SA-modified polymer film;

[0028] Step (3), preparation of gel electrolyte: soak the SA-modified polymer membrane prepared in step (2) in l...

Embodiment 1

[0040] (1) Dissolve 1.05g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) with a mass ratio of 7:3 and 0.45g of cellulose acetate (hydroxyl content 4.0wt.%) in 10mL of a volume ratio of 3:7 In a mixed solvent of acetone and N,N-dimethylacetamide (DMAc), heat and stir at 45°C for 6h until dissolved to obtain a homogeneous slurry. The above slurry was prepared into a polymer film by electrospinning (spinning conditions: advancing speed 1mL / h, electrostatic field voltage 20KV, receiving distance 15cm).

[0041] (2) Soak the polymer film prepared in the above steps with a mixed solvent of ethanol and water with a volume ratio of 3:7 for 2 minutes, take it out, soak it in 0.5wt.% sodium alginate aqueous solution for 10 hours, take it out, 60°C Dry to obtain a sodium alginate modified polymer film.

[0042] (3) In a glove box filled with argon, place the SA-modified polymer film prepared in step (2) in a liquid electrolyte, the composition of which is 1mol / L LiPF 6 Disso...

Embodiment 2

[0055] The difference from the preparation process of Example 1 is that step (1) is changed to: 1.2 g of polyvinylidene fluoride-hexafluoropropylene (PVDF−HFP) with a mass ratio of 8:2 and cellulose acetate (hydroxyl content 4.0 wt.%) 0.3g was dissolved in 10mL of acetone and N,N-dimethylacetamide (DMAc) mixed solvent with a volume ratio of 3:7, heated and stirred at 45°C for 6h until dissolved. The above slurry was prepared into a film by electrospinning (spinning conditions: advancing speed 1mL / h, electrostatic field voltage 20KV, receiving distance 18cm).

[0056] Other steps are identical with embodiment 1.

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Abstract

The invention relates to gel electrolyte capable of improving cathode material electrode/electrolyte interface stability, a preparation method and a lithium battery. The preparation method comprises the following steps: stirring and dissolving electrolyte matrix materials and cellulose acetate into an organic solvent to obtain uniform slurry, and preparing the slurry into a polymer film by adopting an electrospinning method; infiltrating the polymer film with a mixed solvent of ethanol and water, then soaking in sodium alginate aqueous solution, then taking out and drying, thus an SA modifiedpolymer film is obtained; and soaking the SA modified polymer film in liquid electrolyte for 4-24 hours, thus the gel electrolyte is obtained. When the gel electrolyte is adopted for producing the lithium battery, the aims of stabilizing an electrode structure and improving cycling stability of the battery can be achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a gel electrolyte capable of improving the interface stability of a high-nickel ternary positive electrode material / electrolyte, a preparation method and a lithium battery. Background technique [0002] On the one hand, the use of fossil energy has brought environmental pollution hazards to human society. On the other hand, its non-renewable nature has forced human beings to face up to the status quo of its depletion, and strive to find alternative clean energy sources. At present, lithium-ion batteries are more and more widely used in new energy vehicles, communication equipment and other fields because of their environmental friendliness, no memory effect, and high energy density. However, there are still many problems in the application of lithium-ion batteries. For example, the instability of the electrode / electrolyte interface during cycling seriously affects t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 高学平孙艳云李国然刘胜
Owner NANKAI UNIV
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