Negative pole piece for solid-state battery as well as preparation method and application of negative pole piece

A technology of negative pole piece and solid-state battery, applied in electrode manufacturing, battery electrode, lithium battery, etc., can solve the problems of lithium negative electrode, battery short-circuit failure, reaction passivation, etc., which is beneficial to normal temperature performance and uniform thickness control, the effect of uniform and dense surface

Pending Publication Date: 2021-04-16
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formed protective film is brittle and fragile, which cannot solve the problem of lithium negative electrode
[0006] The problems encountered by conventional lithium metal anodes in the application of all-solid-state batteries, such as battery short-circuit failure caused by pressure extension during battery manufacturing and assembly, pulverization during cycling, high volume expansion, and long lithium dendrites piercing the electrolyte membrane, etc., Reaction passivation at the contact interface with the electrolyte, etc., is an urgent problem to be solved at present

Method used

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  • Negative pole piece for solid-state battery as well as preparation method and application of negative pole piece
  • Negative pole piece for solid-state battery as well as preparation method and application of negative pole piece
  • Negative pole piece for solid-state battery as well as preparation method and application of negative pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This embodiment provides a negative electrode sheet for a solid-state battery, such as figure 1 As shown, the negative electrode sheet includes a 5 μm thick copper foil 1 , a 5 μm thick lithium metal layer 2 , a 0.5 μm thick lithium nitride layer 3 and a 50 μm thick organic-inorganic composite layer 4 which are sequentially stacked.

[0059] The preparation method of the negative electrode sheet is as follows:

[0060] (1) Electroplate lithium metal with a thickness of 5 μm on the surface of copper foil 1 as the base material of the lithium-copper composite strip, place the above-mentioned lithium-copper composite strip on a flat vacuum panel and fix it, and use a continuous gas heating spraying device connected to a nitrogen pipe at 150 ° C. Under the conditions of spraying pressure of 0.5Mpa and spraying speed of 0.03m / S, a layer of lithium nitride (Li 3 N) layer to obtain a lithium-copper composite substrate after surface treatment.

[0061] (2) 30 parts of PMMA po...

Embodiment 2

[0064] This embodiment provides a negative electrode sheet for a solid-state battery. The negative electrode sheet includes a 5 μm thick copper foil, a 1 μm thick lithium metal layer, a 100 nm thick lithium nitride layer, and an 80 μm thick organic-inorganic composite layer that are sequentially stacked. layer.

[0065] The preparation method of the negative pole piece is as follows: (1) Electroplate lithium metal with a thickness of 5 μm on the surface of copper foil 1 as a lithium-copper composite strip substrate, place the above-mentioned lithium-copper composite strip on a flat vacuum panel to fix it, and use a nitrogen gas connection to The continuous gas heating injection equipment of the tube sprays the surface of lithium metal at 150°C with a spray pressure of 0.5Mpa and a spray speed of 0.03m / S to generate a layer of lithium nitride (LiN) in situ. 3 N) layer to obtain a lithium-copper composite substrate after surface treatment.

[0066] (2) 30 parts of PMMA polymer ...

Embodiment 3

[0068] This embodiment provides a negative electrode sheet for a solid-state battery. The negative electrode sheet includes a 5 μm thick copper foil, a 10 μm thick lithium metal layer, a 1 μm thick lithium nitride layer, and a 50 μm thick organic-inorganic composite layer that are sequentially stacked. layer.

[0069] The preparation method of the negative electrode sheet is as follows:

[0070] (1) Electroplate lithium metal with a thickness of 5 μm on the surface of copper foil 1 as the base material of the lithium-copper composite strip, place the above-mentioned lithium-copper composite strip on a flat vacuum panel and fix it, and use a continuous gas heating spraying device connected to a nitrogen pipe at 150 ° C. Under the conditions of spraying pressure of 1Mpa and spraying speed of 0.01m / S, the surface of lithium metal is sprayed to form a layer of lithium nitride (LiN) in situ. 3 N) layer to obtain a lithium-copper composite substrate after surface treatment.

[007...

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Abstract

The invention provides a negative pole piece for a solid-state battery as well as a preparation method and application of the negative pole piece. The negative pole piece comprises a copper foil, a lithium metal layer, a lithium nitride layer and an organic-inorganic composite layer which are sequentially stacked. Ultrathin uniformly-electroplated lithium metal is used as a base material, and surface modification is carried out on the surface of the base material through nitrogen, so that the lithium metal is uniformly deposited, short circuit is prevented, and loss of a lithium source in the circulation process is reduced; and then the organic-inorganic composite coating layer is compounded on the surface of the treated lithium metal, so that the charged and deposited lithium metal is deposited more uniformly and compactly, the short circuit is effectively inhibited, and the interface reaction promotion cycle generated by direct contact between the lithium metal and an electrolyte is inhibited, so that the technical problem that the lithium metal is difficult to apply to an all-solid-state battery is solved.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to a negative pole piece for a solid-state battery and a preparation method and application thereof. Background technique [0002] With the continuous improvement of the energy density and safety requirements of the battery module in the passenger electric vehicle market, the energy density of the traditional liquid ion battery has gradually failed to meet the market demand. The trend of electrification of vehicles has been questioned. [0003] As the main solution of next-generation batteries to solve the energy density and safety defects of traditional liquid batteries, solid-state batteries have attracted much attention because of their mass energy density up to 400Wh / kg and non-spontaneous combustion. At present, the research of solid-state batteries by major companies and research institutions is far less in-depth than that of liquid batteries. The high energy dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/1395H01M4/04H01M10/052
CPCY02E60/10H01M4/661C25D3/42H01M4/1395H01M4/134H01M10/0525H01M4/0452H01M2004/027H01M4/0404H01M4/366H01M4/382H01M4/405H01M4/0435H01M2004/021H01M4/62H01M4/625H01M4/0419H01M10/0562H01M2300/0068H01M4/5825H01M4/525H01M10/0585C25D7/0614
Inventor 黄海强陈少杰王磊
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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