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Lithium ion battery capable of quick charging

A technology of lithium-ion batteries and separators, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of less exposure, and achieve the effects of simplified procedures, excellent rate performance and safety performance, and high-voltage platforms

Inactive Publication Date: 2015-02-11
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, many patents or patent applications have disclosed technical solutions for changing the charging method to increase the charging speed, but there are few disclosures about fast-chargeable battery chemical systems, especially those involving high energy density.

Method used

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  • Lithium ion battery capable of quick charging
  • Lithium ion battery capable of quick charging
  • Lithium ion battery capable of quick charging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A lithium ion battery provided in this embodiment includes a positive electrode sheet, a negative electrode sheet, a separator disposed between the positive electrode sheet and the negative electrode sheet, and an electrolyte;

[0035] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the surface of the positive electrode current collector. In terms of mass percentage, the positive electrode active material layer includes the following components:

[0036] Positive electrode active material nickel cobalt lithium manganese oxide 80%;

[0037] Positive electrode active material lithium iron phosphate 15%

[0038] Positive electrode conductive agent carbon black 2.5%;

[0039] Positive electrode binder polyvinylidene fluoride 2.5%;

[0040] The positive current collector is an aluminum foil with a thickness of 16 μm.

[0041] The negative electrode sheet includes a negative electrode c...

Embodiment 2

[0060] The difference from Example 1 is that the positive electrode active material is a mixture of lithium nickel cobalt aluminate and lithium iron phosphate, the mass ratio of the two is 70:25, the surface of lithium iron phosphate is covered with a carbon layer, and the mass of the carbon layer is the same as The mass ratio of lithium iron phosphate is 1:100, and the mass content of the positive electrode active material is 95%; the positive electrode conductive agent is a mixture of carbon nanotubes and carbon black, and the mass ratio of the two is 1:1; the positive electrode binder Be sodium alginate; All the other are with embodiment 1, do not repeat them here.

Embodiment 3

[0066] The difference from Example 1 is that the positive electrode active material is a mixture of lithium cobaltate and lithium iron phosphate, the mass ratio of the two is 80:10, and the mass content of the positive electrode active material is 90%, wherein the lithium cobaltate doped There is Mg with a mass percentage of 1%, the surface of lithium iron phosphate is coated with a carbon layer, and the ratio of the mass of the carbon layer to the mass of lithium iron phosphate is 0.5:100; the positive electrode conductive agent is a mixture of carbon nanotubes and graphene, And the mass content of carbon nanotubes is 2%, and the mass content of graphene is 3%; The positive electrode binder is polyvinyl alcohol, and the mass content of positive electrode binder is 5%; All the other are the same as embodiment 1, no longer here repeat.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery capable of quick charging. The battery includes a positive plate, a negative plate, isolating films arranged between the positive and negative plates at intervals, and electrolyte. The positive plate includes a positive current collector and a positive electrode active material layer arranged on the surface of the positive current collector. The positive electrode active material layer includes a positive electrode active material, a positive electrode conductive agent and a positive adhesive. The positive electrode active material includes components A and B. the component A is selected from at least one of nickel-cobalt lithium aluminate, nickel-cobalt lithium manganate, lithium manganate and lithium cobaltate. The component B is selected from at least one of lithium iron phosphate and lithium titanate. The mass percent of the component B in the positive electrode active material is 5-9 percent. In comparison with the prior art, the lithium ion battery has the advantages that the time of low voltage constant current charging can be prolonged due to use of the mixed positive electrode active material, and thus the charging speed is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a fast-chargeable lithium-ion battery with better high-rate charging and discharging characteristics. Background technique [0002] As a clean and environmentally friendly functional component, lithium-ion batteries have been widely used in more and more fields, for example, in the field of consumer electronics, electric vehicles, energy storage systems, and recently emerging Balance bike field, etc. [0003] Among them, consumer electronic products commonly used by people, such as mobile phones and notebook computers, use more and more power, so their requirements for the battery life of lithium-ion batteries are also increasing. The endurance of lithium-ion batteries is mainly reflected in its energy density and charging speed. At present, it is increasingly difficult to increase the energy density of lithium-ion batteries, and expanding the charging speed of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525H01M4/366H01M4/38H01M4/381H01M4/386H01M4/622H01M4/625H01M4/364H01M4/131H01M4/136H01M4/133H01M4/134H01M4/623H01M4/5825H01M4/587Y02E60/10
Inventor 高潮王升威陈杰骆福平郑强申红光
Owner DONGGUAN AMPEREX TECH
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