Solid-state battery electrode unit

A technology for electrode units and solid-state batteries, applied in electrical components, secondary batteries, solid electrolytes, etc., can solve problems such as lack of continuous transition characteristics, reduced interface resistance, and reduced safety of solid-state batteries, and achieve battery cycle performance and rate Significant decline in performance, reduced interface resistance, and increased interface resistance

Active Publication Date: 2020-05-01
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method will inevitably lead to a decrease in the safety of solid-state batteries due to the addition of a large amount of ionic liquids.
[0006] CN105280884B discloses an all-solid electrode structure with a solid electrolyte concentration gradient. The method uses a solid electrolyte with a concentration gradient in the positive and negative electrodes, but actually the electrode has a concentration gradient and is still a single electrolyte layer. The positive and negative electrodes The interface in contact with the electrolyte layer does not have continuous transition characteristics, and the interface resistance will not decrease
However, the system of the above composition still contains a certain amount of lithium salt, which does not belong to the category of all-solid-state batteries, and the electrolyte content does not have a continuous gradient concentration.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0068] Positive electrode layer: Aluminum foil is used as the positive electrode collector, nickel-cobalt-aluminate-lithium aluminate coated with aluminum oxide with a thickness of 100nm is used as the positive electrode active material, nano-carbon fiber is used as the positive electrode conductive agent, and polytetrafluoroethylene is used as the positive electrode adhesive. Junction, the surface coating thickness of 5nm Al2O3 Li 7 La 3 Zr 2 o 12 As a positive electrode solid electrolyte; the mass ratio of positive electrode active material, positive electrode conductive agent, positive electrode binder, and positive electrode solid electrolyte is 90:1:2:7;

[0069] Negative electrode layer: Copper foil is used as the negative electrode collector, and SiO is used x / C (the SiO x The preparation process of / C is as follows: mix silicon oxide and glucose at a weight ratio of 1:120, and roast at 600°C for 6 hours to obtain SiO x / C) As the negative electrode active materia...

Embodiment 2

[0073] Positive electrode layer: Aluminum foil is used as the positive electrode collector, nickel cobalt aluminum oxide lithium with a surface coating thickness of 200nm aluminum phosphate is used as the positive electrode active material, carbon nanotubes are used as the positive electrode conductive agent, and polytetrafluoroethylene is used as the positive electrode conductive agent , the surface coating thickness of 50nm Al2O3 Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 As a positive electrode solid electrolyte; the mass ratio of positive electrode active material, positive electrode conductive agent, positive electrode binder, and positive electrode solid electrolyte is 92:2:3:3;

[0074] Negative electrode layer: Copper foil is used as the negative electrode collector, Si / C (carbon-coated structure, wherein the mass ratio of Si:C is 41:10) is used as the negative electrode active material, acetylene black is used as the negative electrode conductive agent, polytetrafluoroethylene...

Embodiment 3

[0078] The difference from Example 1 is that the concentration of the positive electrode electrolyte on the surface near the positive electrode layer to the surface near the negative electrode layer is 100%, 90%, 80%, 70%, 60% (geometric center in the thickness direction), 30%, 0% % (near the side surface of the negative electrode layer).

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Abstract

The invention relates to a solid-state battery electrode unit. The solid-state battery electrode unit comprises a positive electrode layer, a negative electrode layer and an electrolyte layer, whereinthe electrolyte layer includes positive electrode solid electrolyte having concentration gradient distribution and a negative electrode solid electrolyte having concentration gradient distribution. The solid-state battery contains the continuous transition gradient electrolyte, so the interface resistance condition of the solid-state battery is greatly improved, electrical property of the solid-state battery is improved, and safety of the battery is not reduced, moreover, the solid electrolyte layer can be prepared by a conventional method, and the process is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to an electrode unit of a solid-state battery. Background technique [0002] In recent years, frequent electric vehicle fire accidents have brought the safety of electric vehicles into the focus of public attention. Safety issues have surpassed mileage anxiety and become the primary concern of consumers. High safety is the key and basis for the development of new energy, and "safety first" is the key and prerequisite for ensuring the long-term, healthy and sustainable development of electric vehicles. [0003] The power battery is the core component of an electric vehicle, and its performance plays a decisive role in the overall performance of an electric vehicle, especially its safety. Most of the safety problems of electric vehicles are caused by power batteries. While the industry is constantly pursuing high energy density of batteries to increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0562H01M10/058H01M2300/0068H01M2300/0071H01M2300/0094Y02E60/10Y02P70/50
Inventor 姜涛孙焕丽刘晓蕾闫国丰孟祥宇翟喜民许立超赵子亮
Owner CHINA FIRST AUTOMOBILE
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