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Interlocking type all-solid-state lithium ion battery membrane blank and forming method and forming device thereof

A technology of lithium ion battery and forming method, which is applied in the direction of secondary battery, electrolyte storage battery manufacturing, non-aqueous electrolyte storage battery, etc., can solve the problem of unsatisfactory interface contact area and interface contact effect between polymer solid electrolyte membrane and positive and negative pole pieces, Affect the overall performance of the flexible battery preparation battery, long battery production cycle, etc., to achieve the effect of shortening the production cycle, large interface contact area, and overall performance improvement

Pending Publication Date: 2020-04-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the production process of the above-mentioned lithium-ion battery, the battery is prepared by solution casting method, the production cycle of the battery is long, and the solid electrolyte film and the positive and negative pole pieces are in a two-dimensional solid-solid contact mode, even if the formula of the adhesive is changed and the adhesive is improved. However, the interface contact area and interface contact effect between the polymer solid electrolyte membrane and the positive and negative electrode sheets are still not ideal, which in turn affects the preparation of flexible batteries and the overall performance of the entire battery.

Method used

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  • Interlocking type all-solid-state lithium ion battery membrane blank and forming method and forming device thereof
  • Interlocking type all-solid-state lithium ion battery membrane blank and forming method and forming device thereof
  • Interlocking type all-solid-state lithium ion battery membrane blank and forming method and forming device thereof

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Experimental program
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Effect test

Embodiment 1

[0045] In this embodiment, an interlocking all-solid-state lithium-ion battery membrane embryo, such as figure 1 As shown, it is an integrated multi-layer structure with an integral interlocking structure 6, including a positive pole piece, a polymer solid electrolyte membrane 3 and a negative pole piece, and the positive pole piece, the polymer solid electrolyte membrane and the negative pole piece are connected in sequence And the three form an integral interlocking structure; the integral interlocking structure is a groove-like or protruding interlocking structure in which multi-layer structures are superimposed, and in this embodiment it is a boss-like structure.

[0046] Wherein, the positive electrode sheet includes a positive electrode current collector 1 and a positive electrode active layer 2, and the positive electrode active layer is arranged between the polymer solid electrolyte membrane and the positive electrode current collector; the negative electrode sheet incl...

Embodiment 2

[0050] This embodiment is a method and device for forming an interlocking all-solid-state lithium-ion battery membrane embryo, which is suitable for jointly processing and forming a polymer solid-state electrolyte membrane, a positive pole piece, and a negative pole piece.

[0051] Such as figure 2 As shown, the forming device of the interlocking all-solid-state lithium-ion battery membrane embryo includes a first extruder 7, a second extruder 8, a third extruder 9, a multi-layer co-extrusion die head 10, and a negative electrode current collector sleeve. Barrel 12, positive electrode current collector sleeve 13 and embossing machine, the head of the first extruder, the head of the second extruder and the head of the third extruder are jointly connected to the multi-layer co-extrusion die head, and the positive electrode The current collector sleeve and the negative electrode current collector sleeve are respectively arranged on the outside of the multi-layer co-extrusion die...

Embodiment 3

[0060] In this embodiment, a method and device for forming an interlocking all-solid-state lithium-ion battery membrane blank, compared with Embodiment 2, the difference is that: Figure 4 As shown, there is also a vacuum drying oven 18 between the embossing machine and the collection roller. After the interlocking all-solid-state lithium-ion battery membrane embryo is formed, it has a three-dimensional interlocking structure, and then it is further dried in a vacuum drying oven. collect. The molding device is more suitable for use when the positive active layer and the negative active layer are formed by solution extrusion. Among them, each extruder, multi-layer co-extrusion die head, other components of the embossing machine except the vacuum forming roller, vacuum drying oven, etc. can use traditional corresponding devices.

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Abstract

The invention discloses an interlocking type all-solid-state lithium ion battery membrane blank and a forming method and a forming device thereof. The lithium ion battery membrane blank is of an integrated multilayer structure with an integral interlocking structure and comprises a positive pole piece and a polymer solid electrolyte membrane which are connected with each other, and the integral interlocking structure is of a groove-shaped or convex embedded structure formed by superposing multilayer structures. The forming method of the interlocking structure comprises the following steps: co-extruding and forming the polymer solid electrolyte membrane, a cathode active layer and an anode active layer in a co-extrusion manner, and then carrying out tape-casting and hot-pressing forming onthe polymer solid electrolyte membrane, the cathode active layer and the anode active layer with a positive current collector and a negative current collector by adopting an imprinting machine, so asto form the groove-shaped or convex integral interlocking structure while compounding. The device comprises a plurality of extruders, a multi-layer co-extrusion die head, positive and negative currentcollector sleeves and the imprinting machine, the plurality of extruders are jointly connected with the multi-layer co-extrusion die head, and a plurality of grooves are distributed in the surface ofa vacuum forming roller in the imprinting machine. According to the invention, the production period of the lithium ion battery can be effectively shortened, and the structural stability of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion batteries, in particular to an interlocking all-solid-state lithium-ion battery membrane blank, a forming method and a forming device thereof. Background technique [0002] In recent years, lithium-ion batteries with high energy density, high output voltage, and long cycle life with low capacity fade have achieved great success as the main power source for electric vehicles and modern energy storage systems. However, lithium-ion batteries containing organic liquid electrolytes are prone to dangerous phenomena such as chemical side reactions, lithium dendrites, leakage, and internal short circuits. All-solid-state lithium-ion batteries containing solid-state polymer electrolytes are considered to be a very promising alternative due to their high safety. [0003] All-solid-state lithium-ion batteries are mainly composed of positive and negative electrodes and solid polymer electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张桂珍严明保
Owner SOUTH CHINA UNIV OF TECH
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