Anode and cathode base bands, anode and cathode pieces, lithium ion battery with high power capacity and preparation method of lithium ion battery

A technology for lithium-ion batteries, positive and negative pole pieces, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as difficulty in continuous normal production, increased production difficulty, and unstable production. Achieve the effect of improving the production pass rate, not easy to be oxidized, and good conductivity

Inactive Publication Date: 2018-11-27
HUNAN GRAND PRO ROBOT TECH
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  • Summary
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Problems solved by technology

[0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect. They have been widely used in various industries, but the requirements for battery capacity in various fields are getting higher and higher, especially in portable machines; Therefore, basebands of about 15 microns are generally used now. In recent years, some manufacturers have adopted basebands as thin as 4 microns in order to increase battery capacity. Although the capacity can be increased, production is more difficult. The pass rate is low, the production is unstable, and it is difficult to continue normal production

Method used

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  • Anode and cathode base bands, anode and cathode pieces, lithium ion battery with high power capacity and preparation method of lithium ion battery

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[0021] Further, the present invention also provides a method for preparing the above-mentioned high-capacity lithium-ion battery, the method comprising the following steps: respectively coating the positive and negative active materials on the positive and negative base tapes, drying and rolling to obtain the positive and negative electrodes The pole piece is wound, injected with a lithium hexafluorophosphate solution with a concentration of 0.5-5 mol / L, and converted to volume to obtain a lithium-ion battery.

[0022] Wherein, in the above-mentioned method for preparing a high-capacity lithium-ion battery, the concentration of the lithium hexafluorophosphate solution is 0.5-2 mol / L, such as 1 mol / L.

[0023] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. The following examples are only to illustrate and explain the present invention, but should not be construed as limiting the protection sco...

Embodiment 1

[0026] The positive and negative electrodes all adopt 0.5 micron thick titanium foil with holes, the porosity (pore area / titanium foil total area is 5%), the positive active material is lithium cobaltate, and the negative active material is graphite. Coating on titanium foil, drying, and rolling to obtain a new type of pole piece, winding the pole piece, injecting 1mol / L lithium hexafluorophosphate organic solution, and forming a volume to obtain a new type of 18650 battery.

Embodiment 2

[0028] The positive and negative electrodes all adopt 0.5 micron thick titanium foil with holes, the porosity (pore area / titanium foil total area is 15%), the positive active material is lithium cobaltate, and the negative active material is graphite. Coating on titanium foil, drying, and rolling to obtain a new type of pole piece, winding the pole piece, injecting 1mol / L lithium hexafluorophosphate organic solution, and forming a volume to obtain a new type of 18650 battery.

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Abstract

The invention belongs to the field of lithium batteries and specifically relates to anode and cathode base bands, anode and cathode pieces, a lithium ion battery with high power capacity and a preparation method of the lithium ion battery. Pored titanium-containing metal foils are selected as the anode and cathode base bands; the titanium-containing metal foils are titanium metal foils or titaniumalloy metal foils; the thickness of the titanium-containing metal foils is 0.5-10 micrometers; the porosity of the titanium-containing metal foils (pore area/titanium foil total area) is within 1-50%. According to the invention, the pored titanium metal foils are used as the electrode base bands, so that the base band thickness is reduced, the tensile strength of the base bands is promoted, the production yield of the lithium ion battery is greatly increased (reaching up to 99%), and the base bands are suitable for large-scale production. Meanwhile, the base bands are difficult to be oxidizedand have high electrical conductivity, so that the prepared lithium ion battery not only has excellent 5C high-rate discharge performance but also has high battery capacity.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a positive and negative electrode base band, a positive and negative electrode sheet, a high-capacity lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect. They have been widely used in various industries, but the requirements for battery capacity in various fields are getting higher and higher, especially in portable machines; Therefore, basebands of about 15 microns are generally used now. In recent years, some manufacturers have adopted basebands as thin as 4 microns in order to increase battery capacity. Although the capacity can be increased, production is more difficult. The qualified rate is low, the production is unstable, and it is difficult to continue normal production. [0003] Therefore, it has become a tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/13H01M10/0525
CPCH01M4/13H01M4/661H01M4/662H01M4/80H01M10/0525Y02E60/10
Inventor 谢红波陈海初陈振兵
Owner HUNAN GRAND PRO ROBOT TECH
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