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Bipolar electrode, lithium ion battery and fabrication method of lithium ion battery

A technology for bipolar electrodes and lithium-ion batteries, applied in bipolar electrodes, active material electrodes, electrode carriers/collectors, etc., can solve the problems of complex manufacturing process, easy holes, uneven distribution of conductive particles, etc., to achieve The process is simple, the effect of reducing liquid junction short circuit and preventing partial short circuit at the edge of bipolar current collector

Active Publication Date: 2017-10-10
SHENZHEN CENT POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the current problems of bipolar electrodes such as complex manufacturing process, uneven distribution of conductive particles, and easy occurrence of holes, the present invention provides a bipolar electrode

Method used

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  • Bipolar electrode, lithium ion battery and fabrication method of lithium ion battery
  • Bipolar electrode, lithium ion battery and fabrication method of lithium ion battery
  • Bipolar electrode, lithium ion battery and fabrication method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A lithium ion battery, its manufacture method is as follows

[0075] (1) Preparation of conductive paste

[0076] According to 100% by mass, the conductive paste is

[0077] Carbon black (SP) 2%;

[0078] Epoxy resin 4%;

[0079] NMP solvent 94%;

[0080] Mix and stir the above formula components to form a conductive paste.

[0081] (2) Production of bipolar electrodes:

[0082] Such as figure 2 As shown, the 20 μm copper-aluminum composite foil is used as the current collector 1 of the bipolar electrode, and the conductive paste in step (1) is evenly coated on the front and back sides of the current collector according to a certain surface density, and dried to obtain The first conductive layer 2 and the second conductive layer 3

[0083] Will be made of positive electrode active material LiCoO 2 , conductive agent SP, and binder PVDF are mixed with NMP and stirred to obtain a uniformly dispersed positive electrode slurry, which is coated on the surface coated...

Embodiment 2

[0089] A lithium ion battery, its manufacture method is as follows

[0090] (1) Preparation of conductive paste

[0091] According to 100% by mass, the conductive paste is

[0092] Carbon black (SP) 2%;

[0093] Epoxy resin 4%;

[0094] NMP solvent 94%

[0095] Mix and stir the above formula components to form a conductive paste.

[0096] (2) Production of bipolar electrodes:

[0097] Such as figure 2 As shown, the 20 μm copper-aluminum composite foil is used as the current collector 1 of the bipolar electrode, and the conductive paste in step (1) is evenly coated on the front and back sides of the current collector according to a certain surface density, and dried to obtain The first conductive layer 2 and the second conductive layer 3

[0098] Will be made of positive electrode active material LiCoO 2 , conductive agent SP, and binder PVDF are mixed with NMP and stirred to obtain a uniformly dispersed positive electrode slurry, which is coated on the surface of the ...

Embodiment 3

[0104] A lithium ion battery, its manufacture method is as follows

[0105] (1) Preparation of conductive paste

[0106] According to 100% by mass, the conductive paste is

[0107] Carbon black (SP) 2%;

[0108] Polyvinylidene fluoride 4%;

[0109] NMP solvent 94%;

[0110] Mix and stir the above formula components to form a conductive paste.

[0111] (2) Production of bipolar electrodes:

[0112] Such as figure 2 As shown, the 16 μm aluminum foil is used as the current collector 1 of the bipolar electrode, and the conductive paste in step (1) is evenly coated on the front and back sides of the current collector according to a certain surface density, and dried to obtain the first conductive paste. layer 2 and second conductive layer 3

[0113] The positive electrode active material LiNi 0.5 co 0.2 mn 0.3 o 2 , the conductive agent CNTs, and the binder PVDF are mixed with NMP and stirred to obtain a uniformly dispersed positive electrode slurry, which is coated on ...

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly discloses a bipolar electrode, a lithium ion battery and a fabrication method of the lithium ion battery. The bipolar electrode comprises a current collector, also comprises a first conductive layer, a positive active layer, a second conductive layer and a negative active layer and also comprises a sealant, wherein the current collector is provided with a first surface and a second surface right opposite to the first surface, the first conductive layer and the positive active layer are outwards and sequentially laminated from the first surface, the second conductive layer and the negative active layer are outwards and sequentially laminated from the second surface, the sealant is used for firming the first conductive layer, the current collector and the second conductive layer and is arranged on surfaces of the first conductive layer, the current collector and the second conductive layer in a lamination way, the thickness of the sealant on the surface of the first conductive layer is same as the thickness of the positive active layer, and the thickness of the sealant on the surface of the second conductive layer is the same as the thickness of the negative active layer. With the bipolar electrode provided by the invention, the safety and the consistency of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a bipolar electrode, a lithium ion battery and a manufacturing method of the lithium ion battery. Background technique [0002] Environmental pollution and oil shortage are problems faced by countries all over the world, and electric vehicles can be used as a solution to alleviate or even solve these two problems - it can meet the rigid needs of people's daily travel without causing direct pollution to the environment. One of the key technologies for the development of electric vehicles is the power battery. [0003] Because lithium-ion batteries have a series of advantages such as high energy density, high working voltage, long cycle life, and no memory effect, they have become power batteries for electric vehicles and have attracted much attention. In order to apply to electric vehicles, it is necessary to connect multiple power batteries in series to...

Claims

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Application Information

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IPC IPC(8): H01M10/0585H01M4/66H01M2/14H01M2/16H01M10/42H01M4/131H01M4/133H01M4/134H01M4/136H01M4/02
CPCH01M4/02H01M4/131H01M4/133H01M4/134H01M4/136H01M4/663H01M4/667H01M4/668H01M10/0585H01M10/4235H01M2004/029H01M50/403H01M50/411Y02E60/10Y02P70/50
Inventor 刘昌位胡金丰高鹏然吕坤张华农
Owner SHENZHEN CENT POWER TECH
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