Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of improving high-rate charge-discharge characteristics and increasing energy density

Inactive Publication Date: 2015-02-18
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 reports on fast-chargeable battery chemical systems, especially those involving high energy density.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0036] 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;

[0037] 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:

[0038] Positive electrode active material nickel cobalt lithium manganese oxide 98.5%;

[0039] Positive electrode conductive agent carbon black 0.3%;

[0040] Positive electrode conductive agent carbon nanotube 0.4%;

[0041] Positive electrode binder polyvinylidene fluoride 0.8%;

[0042] The positive current collector is an aluminum foil with a thickness of 16 μm.

[0043] The negative electrode sheet includes a negative electrode curre...

Embodiment 2

[0062] The difference from Example 1 is that the positive electrode active material is nickel-cobalt-aluminate lithium, and its mass content is 98.8%, and the nickel-cobalt-aluminate lithium is also doped with Mg with a mass percentage of 0.5%; the positive electrode conductor is carbon nanotubes, and its mass content is 0.5%; the positive electrode binder is sodium alginate, and its mass content is 0.7%; the additive includes tris(pentafluorophenyl) boron with a mass ratio of 1.5% accounting for the total mass of the electrolyte Alkane and 2% VC in the mass ratio of the total mass of the electrolyte, and a lithium salt concentration of 1.1 mol / L, and the rest are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0068] The difference from Example 1 is that the positive electrode active material is a mixture of lithium cobaltate and lithium manganate, the mass ratio of the two is 5:1, and the mass content of the positive electrode active material is 99.2%, wherein the surface of lithium cobaltate Coated with Al 2 o 3 layer, and Al 2 o 3 The ratio of the mass of the layer to the mass of lithium cobaltate is 1:100, and the lithium manganate is doped with Zr with a mass percentage of 0.3%; the positive electrode conductive agent is a mixture of carbon nanotubes and graphene, and the mass of carbon nanotubes The content is 0.1%, and the mass content of graphene is 0.1%; the positive electrode binder is polyvinyl alcohol, and the mass content of the positive electrode binder is 0.6%; Fluorophenylboron oxalate and VC with a mass ratio of 2% to the total mass of the electrolyte, and a lithium salt concentration of 1.15 mol / L, and the rest are the same as in Example 1, and will not be repea...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery. The lithium ion battery comprises a positive plate, a negative plate, an isolating membrane spaced between the positive plate and the negative plate and electrolyte, wherein the positive plate comprises a positive current collector and a positive active material layer arranged on the surface of the positive current collector; the positive active material layer comprises components in percentage by mass as follows: 98.1%-99.8% of positive active materials, 0.1%-1% of a positive conductive agent and 0.1%-1% of a positive adhesive; and a negative conductive agent comprises at least one of carbon fiber, carbon nano tubes, carbon nanorods and graphene or a mixture of carbon black with at least one of carbon fiber, carbon nano tubes, carbon nanorods and graphene. Compared with the prior art, the energy density of the battery and the high-power charge and discharge characteristics of the battery are improved under the premise that a diaphragm isn't separated.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a lithium-ion battery with high energy density and large-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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 高潮王升威陈杰骆福平郑强申红光
Owner DONGGUAN AMPEREX TECH
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