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Lithium ion battery

A lithium-ion battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as electrolyte safety application limitations, achieve high safety, avoid battery softening, and improve safety performance.

Active Publication Date: 2012-01-04
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the safety application of PVDF series gel polymer electrolytes is limited to a certain extent.

Method used

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Examples

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Embodiment 1

[0019] Assemble the positive pole piece, negative pole piece and separator into a bare cell by winding or stacking, put the wound or stacked bare cell into the packaging aluminum foil, and pour a certain amount of water into the packaging aluminum foil The amount of 1mol / L LiPF6 lithium salt, the solvent is EC+PC+DEC, the volume ratio of the solvent is 1:1:1 electrolyte and vacuum packaged, and the pressure is 2.2MPa at 85°C for 5h. The isolation membrane is a copolymer of ammonium acrylate and acrylonitrile; the thickness d of the isolation membrane is 14um, and the pore diameter ps and porosity pr are respectively: 0.05um and 32%.

Embodiment 2

[0021] The difference from Example 1 is that: the outer layer of the separator is a copolymer of lithium acrylate and acrylonitrile, and the inner layer is a PP layer; it is carried out at 90° C. and a pressure of 2.0 MPa for 4 hours. The thickness d of the isolation membrane is 16um, and the pore diameter ps and porosity pr are respectively: 0.06um and 46%. Others are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0023] The difference from Example 1 is that the outer layer of the isolation membrane is a copolymer of ammonium acrylate and acrylonitrile, and the inner layer is a PE layer; it is carried out at 110° C. and a pressure of 2.0 MPa for 2.5 hours. The thickness d of the isolation membrane is 20um, the pore diameter ps and the porosity pr are respectively: 0.07um and 52%.

[0024] Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery with good hardness. In the lithium ion battery, an isolating membrane is a copolymer of acrylate and acrylonitrile. The isolating membrane of the lithium ion battery provided by the invention has the good electrolytic absorbing capacity and simultaneously can be used for improving the adhesion between positive and negative plates, thus having significant influence on the absorbing capacity of the electrolyte in the battery and the hardness of the battery (especially a thin-type battery).

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with good hardness. Background technique: [0002] With the continuous development of modern electronic information technology, lithium-ion batteries have become an indispensable chemical power source for modern electronic information products due to their high energy density and long cycle life. With the development of science and technology, electronic products are gradually developing towards the trend of small size, light weight and other portability. Therefore, this requires that lithium-ion batteries occupy less and less space, and the development of thin batteries will undoubtedly be a way to reduce space. An effective way, but compared with the thick lithium-ion battery, the hardness of the thin battery is relatively soft. The hardness of the battery is not only related to the shape of the battery, but also related to the amount of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 李枝贤李明
Owner DONGGUAN AMPEREX TECH
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