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Lithium ion battery

A lithium ion battery, ion conduction technology, applied in secondary batteries, battery electrodes, battery pack components and other directions, can solve the problem of electrode composite material curvature limitation, inability to obtain high areal density electrode composite materials, electrode peeling and other problems

Active Publication Date: 2012-07-25
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this process are: (1) Due to the use of more binders in the coating process, some electrode materials cannot be fully utilized, and high surface density electrode composite materials cannot be obtained; (2) Electrode active materials and current collectors The bonding force between them is relatively poor, and the phenomenon of electrode peeling is prone to occur, resulting in the reduction of its mechanical reliability, and at the same time, the bending rate of the electrode composite material is limited.
Even with thinner electrode composite materials in conventional technology, small curvature changes cannot be achieved in practical processing and manufacturing processes

Method used

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Embodiment 1

[0038] Embodiment 1, its processing step is as follows:

[0039] Step 1: 7 grams of polymer polyvinylidene fluoride was added to 180 grams of N-methylpyrrolidone (NMP), which was thoroughly stirred to dissolve to form a colloidal solution.

[0040] Step 2: The production procedure of the positive electrode composite material is as follows: 7 grams of polyvinylidene fluoride, a binder, is added to 180 grams of N-methylpyrrolidone (NMP) to be fully stirred and dissolved to form a colloidal solution, and 140 grams of polyvinylidene fluoride is added to the solution. g LiFePO 4 Fully mixed with 2.8 grams of conductive carbon Super-P and added to the above colloidal liquid, and stirred with a mixer to make a paste-like positive electrode slurry. The obtained positive electrode material slurry was filled onto the current collector from both sides of 90% porous aluminum foam by the doctoring method. The above current collector containing the electrode slurry was placed in a 110° C....

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Abstract

The invention relates to a lithium ion battery, which comprises at least one group of positive electrode layer and a negative electrode layer, wherein the positive electrode layer and the negative electrode layer are connected through a diaphragm, the positive electrode layer or the negative electrode layer comprises a current collecting body, an electrode material and a porous ion conducting polymer glue layer, the current collecting body is in a multi-seeping-hole electric conductive three-dimensional reticular structure, the electrode material is filled in the seeping holes of the current collecting body, the porous ion conducting polymer glue layer is coated on the current collecting body containing the electrode material. In the lithium ion battery, the positive electrode layer or the negative electrode layer comprises the current collecting body and the electrode material, in addition, the current collecting body realizes the three-dimensional reticular combination with the electrode material through a multi-seeping-hole framework of the current collecting body, so the utilization rate of the electrode material can be improved, and in addition, the lithium ion battery with higher specific energy density and capacity can be obtained.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a lithium ion battery. Background technique [0002] A conventional lithium ion battery includes at least one set of positive electrode layers and negative electrode layers, and the positive electrode layers and the negative electrode layers are connected by a separator. The manufacturing process of the electrode composite material of the positive and negative layers is as follows: coating the electrode material on the metal foil with a binder and forming it. The disadvantages of this process are: (1) Due to the use of more binders in the coating process, some electrode materials cannot be fully utilized, and electrode composite materials with high areal density cannot be obtained; (2) Electrode active materials and current collectors The bonding force between them is relatively poor, and the electrode peeling phenomenon is easy to occur, resulting in the reduction of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M10/0525H01M50/417
CPCY02E60/12H01M4/5825H01M2/1653H01M4/80H01M2/168Y02E60/122H01M4/762H01M4/505H01M10/058H01M4/0404H01M10/0525H01M4/745Y02E60/10H01M50/461H01M50/417
Inventor 黄碧英
Owner LONG POWER SYST SUZHOU
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