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Pole piece and lithium ion battery

A lithium-ion battery and pole piece technology, which is applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problem of difficulty in effectively controlling the lithium replenishment process, and achieve the effect of improving controllability

Pending Publication Date: 2022-03-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a pole piece and a lithium-ion battery to solve the problem that it is difficult to effectively control the lithium-replenishing process of the existing lithium-ion battery

Method used

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  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The pole piece includes:

[0060] Copper foil current collector, set a layer of dense semiconductor layer on the surface of copper foil, the semiconductor layer is a heat-sensitive material with a thickness of 100nm, and the formula (mass ratio) is ZnO:NiO:Al 2 o 3 : Fe 2 o 3 =0.3:0.3:0.3:0.1, the surface resistance of the semiconductor layer at 25°C is 2.3*10 4 mΩ·m 2 , the surface resistance of the semiconductor layer at 60°C is 2.6*10 -3 mΩ·m 2 ; An alkali metal supplementary layer is provided on the side of the semiconductor layer away from the copper foil, and the thickness of the alkali metal supplementary layer is 50 μm.

Embodiment 2

[0062] The pole piece includes:

[0063] Copper foil current collector, set a layer of dense semiconductor layer on the surface of copper foil, the semiconductor layer is a heat-sensitive material with a thickness of 500nm, and the formula (mass ratio) is ZnO:NiO:Al 2 o 3 : Fe 2 o 3 =0.4:0.4:0.1:0.1, the surface resistance of the semiconductor layer at 25°C is 9*10 4 mΩ·m 2 , the surface resistance of the semiconductor layer at 60°C is 1.6*10 -2 mΩ·m 2 ; An alkali metal supplementary layer is provided on the side of the semiconductor layer away from the copper foil, and the thickness of the alkali metal supplementary layer is 300 μm.

Embodiment 3

[0065] The pole piece includes:

[0066] Copper foil current collector, a dense semiconductor layer is set on the surface of the copper foil. The semiconductor layer is a heat-sensitive material with a thickness of 180nm and a formula (mass ratio) of ZnO:NiO:Al 2 o 3 =0.4:0.4:0.2, the surface resistance of the semiconductor layer at 25°C is 6.3*10 4 mΩ·m 2 , the sheet resistance of the semiconductor layer at 60°C is 1.0*10 -3 mΩ·m 2 ; An alkali metal supplementary layer is provided on the side of the semiconductor layer away from the copper foil, and the thickness of the alkali metal supplementary layer is 125 μm.

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Abstract

The embodiment of the invention provides a pole piece and a lithium ion battery, the pole piece comprises a current collector layer, a semiconductor layer and an alkali metal supplement layer, the semiconductor layer is arranged on at least one surface of the current collector layer, and the alkali metal supplement layer is a lithium supplement agent layer or a sodium supplement agent layer. And the alkali metal supplement layer is arranged on one side, far away from the current collector layer, of the semiconductor layer. According to the pole piece provided by the embodiment of the invention, the semiconductor layer is arranged between the current collector layer and the alkali metal supplement layer, so that the alkali metal supplement layer and a battery electrode material are prevented from reacting due to direct contact when the pole piece is pressed. Besides, the on-off of the semiconductor layer can be flexibly controlled according to the adjustment of the trigger condition of the semiconductor layer, so that the supplement rate and supplement amount of the pole piece are controlled, and the lithium supplement flexibility of the lithium ion battery is improved.

Description

technical field [0001] The present application relates to the technical field of battery equipment, and in particular, the present application relates to a pole piece and a lithium ion battery. Background technique [0002] In recent years, with the continuous improvement of people's awareness of environmental protection, electric vehicles have gradually replaced fuel vehicles and become the objects sought after by users. In the process of continuous upgrading of electric vehicles, lithium-ion batteries, as the main power components of electric vehicles, put forward higher requirements for the energy density and cycle life of lithium-ion batteries. [0003] During the first charge and discharge process of lithium-ion batteries, the active lithium ions will be consumed due to the formation of solid electrolyte interfacial film (SEI) on the negative electrode, resulting in a significant decrease in the capacity of lithium-ion batteries. The first charge-discharge coulombic eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M4/13H01M4/134H01M4/139H01M4/1395
CPCH01M4/667H01M4/134H01M4/13H01M4/1395H01M4/139H01M10/0525H01M4/66Y02E60/10H01M4/366H01M4/525H01M4/386H01M4/131H01M4/505H01M10/052H01M2004/021H01M4/62H01M4/661H01M2004/027H01M4/0404H01M4/628
Inventor 梅日国常晓雅刘正皎吴子文潘仪
Owner BYD CO LTD
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