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Electrode current collector, preparation method thereof, negative electrode and lithium ion battery

A technology for electrode collectors and lithium-ion batteries, which is applied in the direction of electrode carriers/collectors, electrode manufacturing, secondary batteries, etc., can solve problems such as limited applications, reduced volumetric energy density, and reduced battery mass energy density, so as to promote Effects of application, improved circulation, and improved structure

Inactive Publication Date: 2019-05-31
SOUNDON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve this problem, in recent years, people have mainly prevented the formation of lithium dendrites or dendrites by increasing the amount of negative electrode coating to increase the lithium intercalation space, using ceramic separators to prevent dendrites from piercing, reducing the compaction density and reducing concentration polarization. Reducing the hazards of lithium dendrite formation, these works have improved the lithium ion battery phenomenon to a certain extent, but will cause a decrease in the mass energy density of the battery or a decrease in the volume energy density, resulting in limited application in vehicle power batteries

Method used

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  • Electrode current collector, preparation method thereof, negative electrode and lithium ion battery

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preparation example Construction

[0023] One embodiment of the present invention provides an electrode current collector and a preparation method thereof. The electrode current collector will be introduced in conjunction with the preparation method below. The preparation method of the electrode current collector comprises the following steps S1-S4:

[0024] Step S1, mixing the silicone rubber and curing agent to obtain a mixed slurry.

[0025] In one embodiment, the silicone rubber is polydimethylsiloxane (PMDS); the curing agent is a polycondensation-type two-component silicone rubber crosslinking agent, such as a curing agent modeled as RTV-2. Further, the mass ratio of the silicone rubber to the curing agent is 10:(0.5-2). Furthermore, the mass ratio of the silicone rubber to the curing agent is 10:1.

[0026] Step S2, coating the mixed slurry on the porous substrate, and curing to form a silicone rubber layer.

[0027] Specifically, the pore diameter of the porous matrix in step S2 is 1 μm-5 μm, and th...

Embodiment 1

[0044] Firstly, the copper foil with a thickness of 8 μm is punched by mechanical processing, and the copper foil is porous; the pores are guaranteed to be uniform, the pore size is about 5 μm, and the porosity is 10%. Secondly, the liquid silicone rubber and the silicone rubber curing agent are stirred and dispersed at a mass ratio of 10:1 to obtain a mixed slurry, which is coated on one side of the prepared porous copper foil substrate with a coating thickness of 2 μm. After the coating is completed, put it in an oven and bake it at 80°C for 24 hours to obtain a PMDS coating, and then perform an opening treatment on the coating with a pore size of 2 μm and a porosity of 20%; finally, the PMDS coating surface is passed through the gas phase The deposition method sprays a certain amount of copper powder with a particle size of 50nm, fills the internal pore structure of PMDS, and forms a copper plating layer with a thickness of about 800nm, and obtains a current collector for th...

Embodiment 2

[0047] Firstly, the copper foil with a thickness of 6 μm is punched through mechanical processing to ensure that the pores are uniform, the pore size is about 5 μm, and the porosity is 12%. Secondly, the liquid silicone rubber and the silicone rubber curing agent are stirred and dispersed at a mass ratio of 10:1 to obtain a mixed slurry, which is coated on one side of the prepared porous copper foil substrate with a coating thickness of 3 μm. After the coating is completed, put it into an oven and bake at 100° C. for 24 hours to obtain a PMDS coating, and then perform a pore opening treatment on the coating, with a pore size of 1.5 μm and a porosity of 30%. Finally, a certain amount of copper powder with a particle size of 60nm is sprayed on the surface of the PMDS coating by vapor deposition method to fill the internal pore structure of PMDS, and at the same time, a copper plating layer with a thickness of about 600nm is formed, and the current collector for the negative elect...

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Abstract

The invention relates to an electrode current collector, a preparation method thereof, a negative electrode and a lithium ion battery. The electrode current collector comprises a porous substrate, a porous silicone rubber layer disposed on the porous substrate, and a metal layer disposed on the porous silicone rubber layer. The method, by improving the structure of the electrode current collector,suppresses the lithium dendrite growth of the lithium ion battery, greatly improves the cycle, rate and safety performance of the lithium ion battery, and avoids a decrease in mass energy density orvolume energy density of the battery caused by increasing the coating amount of the negative electrode, using a ceramic diaphragm, or reducing compaction density and the like, thereby greatly promoting the application of the electrode current collector in the fields of power batteries or other energy storage batteries.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrode collector, a preparation method thereof, a negative electrode and a lithium ion battery. Background technique [0002] Lithium-ion batteries, as the current mainstream energy storage batteries, play an important role in the development of people's lives, such as digital mobile phones, electric vehicles, drones, model airplanes, etc., all need to be powered by lithium-ion batteries. However, during the cycle of lithium-ion batteries, lithium dendrites are prone to occur on the negative side, which seriously affects the cycle and safety performance of the battery. There are many factors that cause lithium dendrites. For example, graphite expands and collapses in the process of continuous charge and discharge, resulting in the reduction of lithium intercalation space, and lithium ions are easy to precipitate to form dendrites; in the later stage, the cycle electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/04H01M4/13H01M10/0525
CPCY02E60/10
Inventor 程兴李东剑李蒙李小兵
Owner SOUNDON NEW ENERGY TECH CO LTD
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