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Solid electrolyte-lithium negative electrode complex, preparation method thereof, and all-solid-state lithium secondary battery

A technology of solid electrolyte and lithium secondary battery, which is applied in the field of electrochemical energy storage, can solve the problem of large interface contact resistance, achieve the effects of reducing interface resistance, increasing specific capacity and cycle life, and improving performance

Pending Publication Date: 2021-04-30
CHINA ENERGY LITHIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Specifically, the present invention uses the lithium deposition technology on the surface of the polyphenylene sulfide solid electrolyte to form a uniform ultra-thin lithium layer by gas phase deposition on the surface of the solid electrolyte. The problem of large contact resistance, thus significantly improving the performance of lithium batteries

Method used

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  • Solid electrolyte-lithium negative electrode complex, preparation method thereof, and all-solid-state lithium secondary battery
  • Solid electrolyte-lithium negative electrode complex, preparation method thereof, and all-solid-state lithium secondary battery
  • Solid electrolyte-lithium negative electrode complex, preparation method thereof, and all-solid-state lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 20 μm lithium metal (1×10 -5 Under Pa vacuum conditions and 800°C), punched into a pole piece with a diameter of 15.6cm, and formed a half-cell with lithium foil. Test the internal resistance of the battery, the obtained curve is as follows image 3 As shown, the internal resistance is about 30Ωcm 2 , the solid electrolyte-lithium anode complex prepared by this method has a small internal resistance, indicating that the contact resistance is better improved.

Embodiment 2

[0036]First prepare the positive electrode, disperse nickel-cobalt-manganese NCM111 (Binbin): acetylene black AB (Betterui): polyvinylidene fluoride PVDF5130 (Shanghai Haiyi) = 95:3:2 (weight ratio), disperse in NMP, control The solid content is 56%, the viscosity is 4000-6000cp, and the stirring time is 6h. Use a coating machine to coat on one side of a 10μm copper foil, and dry to prepare a 100μm thick NCM622 positive electrode sheet.

[0037] Then, a 10 μm lithium metal is vapor-phase-deposited with a 15 μm polyphenylene sulfide solid electrolyte, and the NCM622 positive electrode sheet is used to form a pouch battery. Test the discharge capacity of the battery at different rates, and the obtained curves are as follows Figure 4 As shown, the battery has good rate characteristics and high discharge capacity, up to 260mAh / g.

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Abstract

The invention provides an integrated solid-state electrolyte-lithium negative electrode complex, a preparation method thereof, and an all-solid-state lithium secondary battery containing the integrated solid-state electrolyte lithium negative electrode complex. The complex is composed of: a polyphenylene sulfide solid electrolyte layer; a lithium layer vapor-deposited on one surface of the solid electrolyte layer; and optionally, a metal foil attached to the lithium layer as a current collector or tab. The complex can be directly used as an electrolyte and a negative electrode of the battery. On one hand, the thickness of the lithium layer is effectively controlled, on the other hand, the problem of interface contact between the solid electrolyte and the metal lithium negative electrode is effectively solved, the interface contact resistance is improved, and the specific capacity and the cycle life of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a solid electrolyte-lithium negative electrode complex for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density and good cycle stability, and have been widely used in portable electronic devices, electric vehicles and grid energy storage. The current lithium-ion batteries generally use graphite as the negative electrode material. The working principle is that lithium ions are extracted / intercalated between the layered active material layers of the positive and negative electrodes. However, the specific capacity limit of graphite-based negative electrode materials is about 372mAh / g. Based on this type of Anode materials have been difficult to further improve the energy density of lithium-ion batteries, and it is difficult to meet the market demand for higher energy density lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0525H01M10/0565H01M10/058
CPCH01M10/052H01M10/0525H01M10/0565H01M10/058Y02P70/50Y02E60/10
Inventor 孙兆勇郇庆娜刘承浩
Owner CHINA ENERGY LITHIUM
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