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High-safety and high-energy density lithium ion battery

A high-energy-density, lithium-ion battery technology, applied in the direction of secondary batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as external and internal thermal runaway, save manufacturing costs, and prevent further reactions , the effect of preventing fire and explosion

Inactive Publication Date: 2018-03-06
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-safety method for effectively controlling battery thermal runaway, greatly improving battery safety, and improving battery performance in order to solve the defect that the prior art cannot take into account both external and internal thermal runaway in controlling lithium battery thermal runaway technology. Type high energy density lithium-ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of positive electrode sheet: select nickel-cobalt-manganese ternary material as the main material of the positive electrode material, indium oxide, polyaniline, graphene, polystyrene sulfonate and binder coated with carbon nanotubes as the secondary material of the positive electrode active material, The mass ratio of the main material to the auxiliary material is 3:1, and the weight parts of various components in the auxiliary material are: 50 parts of polyaniline, 30 parts of graphene oxide, 40 parts of polystyrene sulfonate, 10 parts of binder Indium oxide coated with 40 parts carbon nanotubes. The positive electrode slurry is mixed according to the weight ratio of positive electrode active material: conductive agent: binder = 18:1:1, and evenly coated on the positive electrode base fluid aluminum foil. After drying, it is rolled with a rolling machine, and then cut into positive pole pieces. Among them, the preparation method of carbon nanotube-coated i...

Embodiment 2

[0032] Positive electrode sheet preparation: Nickel-cobalt-aluminum was selected as the main material of the positive electrode material, indium oxide, polyaniline, graphene, polystyrene sulfonate and binder coated with carbon nanotubes were used as the auxiliary material of the positive electrode active material, and the main material and The mass ratio of the auxiliary materials is 4:1, and the parts by weight of various components in the auxiliary materials are: 55 parts of polyaniline, 32 parts of graphene oxide, 45 parts of polystyrene sulfonate, 12 parts of binder and 43 parts Indium oxide coated with carbon nanotubes. The positive electrode slurry was mixed according to the weight ratio of positive electrode active material: conductive agent: binder = 89:6:4, and evenly coated on the positive electrode base fluid aluminum foil. After drying, it is rolled with a rolling machine, and then cut into positive pole pieces. Among them, the preparation method of carbon nanotub...

Embodiment 3

[0039] Preparation of positive electrode sheet: Lithium manganese oxide is selected as the main material of the positive electrode material, indium oxide, polyaniline, graphene, polystyrene sulfonate and binder coated with carbon nanotubes are used as the auxiliary material of the positive electrode active material, and the main material and The mass ratio of the auxiliary materials is 5:1, and the parts by weight of various components in the auxiliary materials are: 60 parts of polyaniline, 35 parts of graphene oxide, 50 parts of polystyrene sulfonate, 15 parts of binder and 45 parts Indium oxide coated with carbon nanotubes. The positive electrode slurry was mixed according to the weight ratio of positive electrode active material: conductive agent: binder = 95:2:3, and evenly coated on the positive electrode base fluid aluminum foil. After drying, it is rolled with a rolling machine, and then cut into positive pole pieces. Among them, the preparation method of carbon nanot...

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Abstract

The invention relates to a high-safety and high-energy density lithium ion battery. The battery comprises a positive electrode, a negative electrode, a separator, a diaphragm, tabs and a shell, wherein the diaphragm is used for separating the positive electrode from the negative electrode, a battery cell is formed by winding or lamination, the tabs are respectively welded on a positive pole plateand a negative pole plate, the battery is obtained by packaging the battery cell in a battery shell, injecting the electrolyte and sealing, lithium iron phosphate, lithium manganese, lithium cobaltateand a Ni-Co-Al or Ni-Co-Mn ternary material are used as main materials of a positive active substance, nanometer carbon tube-coated indium oxide, polyaniline, graphene, polystyrene sulfonate and a binding agent are used as auxiliary materials of the positive active substance, and the tabs of the positive electrode and the negative electrode are coated with PTC coating layers. The PTC coating layer is coated at a tab position of the lithium battery, so that open circuit of the battery can be achieved by protection of the PTC coating layer at an initial period of thermal runaway, further generation of thermal runaway is controlled, and a dangerous state such as fire and explosion of the battery is prevented.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-safety, high-energy-density lithium-ion battery that effectively controls battery thermal runaway, greatly improves battery safety, and improves battery performance. Background technique [0002] The dual pressures from environmental pollution and lack of oil resources have greatly promoted the development of electric vehicles. Lithium-ion batteries have become the focus of vehicle power battery research and development due to their significant advantages such as high specific energy and good cycle performance. However, continuous safety accidents have seriously hindered the commercial application of large-capacity and high-power lithium-ion batteries. There are many causes of lithium-ion battery safety accidents, such as overcharge, short circuit, extrusion, vibration, collision, etc., but from the perspective of the mechanism, it is nothing more than voltage runaway...

Claims

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Application Information

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IPC IPC(8): H01M2/34H01M10/058H01M4/13H01M10/42H01M50/572
CPCH01M4/13H01M10/058H01M10/4235H01M50/572Y02E60/10Y02P70/50
Inventor 彭波吕豪杰殷月辉袁园
Owner WANXIANG 123 CO LTD
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