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Porous composite pole piece and preparation method and application thereof in all-solid-state lithium battery

A pole piece and porous structure technology, applied in the field of all-solid-state lithium batteries and their preparation, can solve the problems of reducing the energy density of the battery, increasing the interface impedance, affecting the electrochemical performance of the battery, etc., so as to reduce the interface impedance, increase the uniformity, avoid the The effect of energy density

Active Publication Date: 2020-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the technology of mixing electrolyte and electrode active material to make slurry coating is usually used to solve the above problems, but this kind of technology will greatly reduce the energy density of the battery due to the excessive amount of electrolyte added.
In addition, different electrolytes will react in the NMP slurry system, forming an inert layer between the electrolyte and the active material, resulting in a significant increase in the interface impedance between the electrode active material and the solid electrolyte, affecting the electrochemical performance of the battery

Method used

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  • Porous composite pole piece and preparation method and application thereof in all-solid-state lithium battery
  • Porous composite pole piece and preparation method and application thereof in all-solid-state lithium battery
  • Porous composite pole piece and preparation method and application thereof in all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] LiMn 2 O 4 , PVDF, acetylene black, NMP solvent, mixed according to 8:1:1, the solid content is 24%, and 1.5% (with LiMn 2 O 4 , PVDF, acetylene black total weight based on 300nm elemental sulfur powder (standard deviation of particle size σ = 5nm). Mix uniformly into slurry. Coat the slurry on the aluminum foil, control the coating thickness to 60μm, and dry it at 110°C for 3h; after drying, roll the pole piece, and then dry it at 180°C for 60 minutes. The positive electrode material layer with porous structure is compounded on the surface of the current collector, and its porosity is 34%.

[0093] The epoxy acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into a curing agent in a ratio of 90:20:5. The curing agent, electrolyte (1MLiPF 6 Mix 1:1EC and DEC) according to the mass ratio of 1:4, and then immerse the dried pole piece in it. After the pole piece is completely soaked, the pole piece is taken out and placed under...

Embodiment 2

[0096] LiFePO 4 , PVDF, acetylene black, and NMP solvent are mixed according to 9:0.5:1, and the solid content is 30%. Add 1% of 800nm ​​elemental sulfur powder (standard deviation of particle size σ=5nm) to it, and mix it evenly into a slurry. The slurry was coated on the aluminum foil, the coating thickness was controlled to 80μm, and it was dried at 80°C for 10h; after drying, the pole piece was rolled and then placed at 200°C for 30 minutes to dry. A positive electrode material layer with a porous structure is compounded on the surface of the current collector with a porosity of 30%.

[0097] The polyester acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into a curing agent in a ratio of 95:15:5. The curing agent and electrolyte (0.7MLiPF 6 Mix 1:1EC and DEC) according to the mass ratio of 1:3, soak the dried pole piece in it, take out the pole piece and place it under a UV lamp for 14s after being completely soaked.

[0098] ...

Embodiment 3

[0100] LiFePO 4 , PVDF, acetylene black, and NMP solvent are mixed according to 8:1:1, and the solid content is 28%. Add 1.8% of 50nm elemental sulfur powder (standard deviation of particle size σ=5nm) to it, mix evenly into slurry, The slurry was coated on the aluminum foil, the coating thickness was controlled to be 75μm, and it was dried at 100°C for 6h; after drying, the pole piece was rolled and then dried at 160°C for 120 minutes. A positive electrode material layer with a porous structure is compounded on the surface of the current collector, and its porosity is 31%.

[0101] The epoxy acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into a curing agent in a ratio of 100:22:5. The curing agent and electrolyte (1MLiTFSI dissolved in EC) are prepared according to the quality Mix at a ratio of 1:4.5, soak the dried pole piece in it, take out the pole piece after complete soaking, and place it under a UV lamp for curing for 2...

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Abstract

The invention belongs to the technical field of solid batteries, and particularly discloses a porous composite pole piece which comprises a current collector and an active material layer compounded onthe surface of the current collector, wherein the active material layer has a porous structure, the porous structure being filled with an electrolyte / polymer composite material. The invention also discloses a preparation method of the porous composite pole piece. The preparation method comprises the following steps: firstly, compounding on the surface of the current collector to form the active material layer with the porous structure; then, soaking the obtained product in a solution containing an electrolyte and a polymer synthesis raw material; carrying out curing reaction on the polymer synthesis raw material, and filling an electrolyte / polymer composite material in pores of the active layer; and obtaining the porous composite pole piece. The pole piece and a lithium piece are assembled into a button cell, it is proved that the material shows excellent electrochemical performance, the electrode polarization can be effectively reduced, and the energy density and the cycling stability of the cell are improved.

Description

Technical field [0001] The invention relates to an all-solid-state lithium battery and a preparation method thereof, belonging to the field of all-solid-state lithium batteries. Background technique [0002] Energy is the vital material foundation for the development of the national economy and the improvement of people's living standards, and it is also an important factor that directly affects economic development. Since the beginning of the 21st century, problems such as resource shortage, environmental pollution, and greenhouse effect caused by traditional energy use have become increasingly prominent. Improving the energy structure and developing high-efficiency and clean new energy have become a global consensus. Lithium-ion batteries are favored by people due to their superior performance such as safety, environmental protection, high specific energy and good electrochemical performance. However, for commercial lithium-ion batteries containing liquid organic solvents, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M10/0525H01M4/13Y02E60/10
Inventor 洪波赖延清王麒羽向前张治安张凯方静
Owner CENT SOUTH UNIV
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