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Electrolyte composition, polymer electrolyte membrane, polymer electrolyte and preparation method thereof, and all-solid-state battery and preparation method thereof

An all-solid-state battery and electrolyte technology, which is applied in the fields of polymer electrolyte and its preparation, electrolyte composition and polymer electrolyte membrane, all-solid-state battery and its preparation, and can solve problems affecting battery uniformity, poor pole piece uniformity, inkjet Problems such as printing difficulties, to achieve the effects of improving production/manufacturing efficiency, reducing manufacturing costs, and improving ease of operation

Active Publication Date: 2021-04-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution has the following disadvantages: 1. The preparation process of the negative pole piece is complicated, because lithium powder has high requirements on the environment, and it needs to be operated in an anhydrous and oxygen-free environment, which makes it difficult to mix, filter, coat, dry, and tablet. operate
2. The negative electrode needs to mix lithium powder with superionic conductors and polymers, which is difficult to mix evenly, resulting in poor uniformity of the pole piece and poor consistency of the battery
3. The positive and negative pole pieces need to be soaked in the polymer electrolyte to make the battery. After soaking, the polymer electrolyte in the gel state is bonded to the pole piece, which increases the complexity of the lamination process and the difficulty of correct lamination.
4. The ionic conductivity of the polymer electrolyte is low, which is far from the requirements of commercial applications
This technical solution has the following disadvantages: 1. The particles of the positive electrode material are large, and the method of inkjet printing is easy to block the delivery pipe and nozzle, which affects the continuity of the manufacturing process.
2. The positive electrode particles are easy to settle, resulting in uneven positive film layer and affecting the uniformity of the battery
3. Conventional cathode slurry is relatively viscous, so inkjet printing is more difficult. In order to adapt to the inkjet process, the solid content of the slurry can only be reduced at the expense of battery capacity
4. Physical vapor deposition equipment and manufacturing costs are high, the process is complex, and there are high requirements for water and oxygen content. The daily environment cannot meet the manufacturing requirements of this technology
5. The ionic conductivity of the polymer electrolyte is low, which is far from the requirements of commercial applications
There is following shortcoming in this technical scheme: 1. preparation process is complicated, and this method at first is that initiator (dibenzoyl peroxide BPO) and monomer MMA are mixed and stirred evenly, then crosslinking agent (ethylene glycol dimethacrylate DEMA), polymer PUA and ionic liquid (DEFYTFSI or Py 13 TFSI) heated and stirred evenly, and finally mixed the two liquids and added the solvent N,N-dimethylformamide (DMF), stirred evenly, then cast, and cured by ultraviolet radiation to form a film
②Because the ionic conductivity of the polymer PUA and PMMA used in this method is not high, the ionic conductivity of the polymer electrolyte membrane is mainly increased by adding ionic liquid, and the cost of ionic liquid is relatively high
③ Dibenzoyl peroxide, the initiator used in ultraviolet crosslinking, is extremely unstable in nature, and it may cause fire and explosion when exposed to bright light, high temperature, and reducing agents, so the danger in the operation process is relatively high

Method used

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  • Electrolyte composition, polymer electrolyte membrane, polymer electrolyte and preparation method thereof, and all-solid-state battery and preparation method thereof

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preparation example Construction

[0036] In a third aspect, the present invention also provides a method for preparing a polymer electrolyte, wherein the preparation method includes: providing an electrolyte slurry containing the above-mentioned electrolyte composition, and then drying to form a film.

[0037] According to the preparation method of the present invention, wherein the method comprises:

[0038] (1) providing an electrolyte slurry containing the above-mentioned electrolyte composition;

[0039] (2) The slurry is cast and molded to obtain a semi-dry film;

[0040] (3) Cross-linking and curing the semi-dry film.

[0041] According to the preparation method of the present invention, in step (1), the solid content of the electrolyte slurry is 1-50%.

[0042] According to the preparation method of the present invention, in step (1), an initiator is also included, equivalent to 100 parts by weight of the electrolyte composition, the content of the initiator is 2-15 parts by weight, and the initiator ...

Embodiment 1

[0088] This example is used to illustrate the polymer electrolyte of the present invention and its preparation method, and the all-solid-state battery and its preparation method.

[0089] Preparation of battery positive sheet:

[0090] (1) 50 parts by weight of the positive electrode material LiFePO 4 , 12.5 parts by weight of copolymer 1#, 6.1 parts by weight of lithium salt LiN(SO 2 CF 2 CF 3 ) 2 , 5.2 parts by weight of pentaerythritol tetraacrylate, 1.2 parts by weight of 2-hydroxyl-2-methylpropiophenone, 15 parts by weight of ionic liquid L1 (1-vinyl-2-ethylimidazole), 5 parts by weight of Polyvinylidene fluoride and 5 parts by weight of conductive graphite are dispersed in 200 parts by weight of N-methylpyrrolidone solvent to obtain positive electrode slurry;

[0091] (2) Coat the positive electrode slurry on both sides of aluminum foil (thickness 20 μm), dry at 60°C for 1 hour, then irradiate with a UV curing instrument for 5 minutes, then continue to dry at 60°C f...

Embodiment 2

[0098] This example is used to illustrate the polymer electrolyte of the present invention and its preparation method, and the all-solid-state battery and its preparation method.

[0099] Preparation of battery positive sheet:

[0100] (1) 60 parts by weight of the positive electrode material LiCoO 2 , 10 parts by weight of copolymer 2#, 4.88 parts by weight of LiN(SO 2 CF 2 CF 3 ) 2 , 4.16 weight parts of pentaerythritol tetraacrylate, 0.96 weight parts of 4-dimethylamino ethyl benzoate, 15 weight parts of ionic liquid L1, 5 weight parts of polyvinylidene fluoride and 4 weight parts of conductive carbon black dispersion In 240 parts by weight of N,N-dimethylformamide solvent, obtain positive electrode slurry;

[0101] (2) Coat the positive electrode slurry on both sides of the aluminum foil (thickness 20 μm), dry at 60°C for 1 hour, then irradiate with a UV curing instrument for 10 minutes, then continue to dry at 60°C for 24 hours, and roll it into a battery positive sh...

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Abstract

The invention relates to the field of all-solid-state batteries, in particular to an electrolyte composition, a polymer electrolyte membrane, a polymer electrolyte and a preparation method thereof, and an all-solid-state battery and a preparation method thereof. Wherein, the electrolyte composition contains a polymer, a lithium salt, an ionic liquid and a crosslinking agent, and the polymer is a structural unit represented by formula (1), a structural unit represented by formula (2), and formula (3) The copolymer composed of the shown structural units, the positive electrode and the electrolyte layer of the battery provided by the present invention have higher peel strength and suitable compaction density, so that the battery has better specific capacity, cycle life, etc.;

Description

technical field [0001] The invention relates to the field of all-solid-state batteries, in particular to an electrolyte composition, a polymer electrolyte membrane, a polymer electrolyte and a preparation method thereof, and an all-solid-state battery and a preparation method thereof. Background technique [0002] At present, most lithium-ion batteries on the market use liquid electrolyte as the conductive substance, but during use, the liquid electrolyte is volatile, flammable and explosive, causing many safety problems; moreover, it is easy to grow lithium dendrites, which limits the Application of lithium as negative electrode in batteries. Therefore, solid polymer electrolytes (SPEs) have been proposed to replace liquid electrolytes. The solid polymer electrolyte membrane not only plays the role of ion conduction, but also prevents the contact of positive and negative electrodes. And because of its strong plasticity, it can be made into films of different shapes accord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 高磊刘荣华单军
Owner BYD CO LTD