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Negative electrode, and preparation method and application thereof

A technology of negative electrode and negative electrode activity, applied in the direction of negative electrode, electrode manufacturing, battery electrode, etc., can solve the problems of complicated operation, reduced effectiveness, first charge and discharge efficiency and discharge capacity need to be further improved, etc.

Inactive Publication Date: 2021-08-06
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the battery is used, conditions such as ultraviolet light or heating are required to cause the prepolymer to produce a polymerization reaction to play the role of the prepolymer, and the operation is complicated. The first charge and discharge efficiency and discharge capacity of the lithium ion battery after lithium supplementation need further improvement. improve
[0004] CN109301188A provides a highly dispersed lithium-ion battery supplementary lithium material and a preparation method thereof. The lithium supplementary material is a graphene sheet with metal lithium particles evenly dispersed on the surface, and the surface of the metallic lithium particles is coated with a carbon layer, but the scheme Lithium on the surface of the monolithic graphene in the medium will be crushed and detached from the graphene surface during cycling, resulting in dead lithium, which greatly reduces the effectiveness of the material

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  • Negative electrode, and preparation method and application thereof
  • Negative electrode, and preparation method and application thereof
  • Negative electrode, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0068] This embodiment provides a negative electrode, which includes a current collector 1 , a negative electrode active material layer 2 , a slow-release layer 3 and an active lithium layer 4 which are sequentially stacked, and the thickness of the slow-release layer is 10 μm.

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

[0070] (1) Weigh lithium lanthanum zirconium oxide (LLZO), polyethylene oxide (PEO) and conductive carbon black (mass fraction of lithium lanthanum zirconium oxygen is 67wt%, polyethylene oxide is 4:1:1) 16.5wt%, conductive carbon black is 16.5wt%), with N-methylpyrrolidone as a solvent, made into a uniform, stable lithium ion transmission slow-release layer coating slurry with a solid content of 5%;

[0071] (2) Apply the slurry in (1) to the negative electrode sheet substrate containing the negative active material, and form a 10 μm lithium ion transport slow-release layer after drying at 100 ° C. The ion conductivity of the sl...

Embodiment 2

[0074] This embodiment provides a negative electrode, which includes a current collector, a negative electrode active material layer, a slow-release layer, and an active lithium layer that are sequentially stacked, and the thickness of the slow-release layer is 20 μm.

[0075] The preparation method of the negative electrode is as follows:

[0076](1) Weigh lithium lanthanum titanyl oxide (LLTO), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) and graphene according to the mass ratio of 4:1:0.5 (the mass fraction of lithium lanthanum titanyl oxide is 72.7 wt%, the mass fraction of polyvinylidene fluoride-hexafluoropropylene copolymer is 18.2wt%, and the mass fraction of graphene is 9.1wt%), with N-methylpyrrolidone as solvent, it is made into a uniform solid content of 20%. , Stable lithium ion transport slow release layer coating slurry;

[0077] (2) Coat the slurry in step (1) on the negative electrode sheet substrate containing the negative electrode activ...

Embodiment 3

[0080] This embodiment provides a negative electrode, which includes a current collector, a negative electrode active material layer, a slow-release layer, and an active lithium layer that are sequentially stacked, and the thickness of the slow-release layer is 10 μm.

[0081] The preparation method of the negative electrode is as follows:

[0082] (1) Weigh lithium lanthanum zirconium oxide (LLZO), polyethylene oxide (PEO) and conductive carbon black according to the mass ratio of 1:4:1, and use N-methylpyrrolidone as solvent (lithium lanthanum zirconium oxygen mass fraction 16.57wt%, polyethylene oxide is 67wt%, conductive carbon black is 16.5wt%), is made into the uniform, stable lithium ion transmission slow-release layer coating slurry that solid content is 5%;

[0083] (2) Apply the slurry in (1) to the negative electrode sheet substrate containing the negative electrode active material, and form a 10 μm lithium ion transport slow-release layer after drying at 120 ° C. T...

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Abstract

The invention provides a negative electrode, and a preparation method and application thereof. The negative electrode comprises a current collector, a negative electrode active material layer, a slow-release layer and an active lithium layer which are sequentially stacked, the slow-release layer comprises inorganic particles and a binder, and the ionic conductivity of the slow-release layer is smaller than 10<-4> S / cm. The slow-release layer with the inorganic particles is added between the active lithium layer and the negative electrode active layer, so that direct contact between metal lithium and a negative electrode active material before a lithium supplementing process is avoided, and the effect of improving the safety performance of the battery is further achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode and its preparation method and application. Background technique [0002] Using metallic lithium as a lithium source to supplement lithium to the negative electrode is the most direct and effective means of supplementing lithium. However, due to the direct contact between the electrode layer material and the lithium layer, lithiation is prone to occur, which may even cause safety problems such as fire or explosion in serious cases; at the same time, metal lithium is used as a lithium supplementary layer and the surface structure of the pole piece is rough, and it is in point contact when laminating. Mainly, so the electron transfer only occurs at the contact point and radiates to the surroundings, resulting in uneven lithium replenishment process of the negative electrode sheet. In addition, the metal lithium supplementary layer is in direct cont...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M4/139H01M4/04H01M10/0525H01M10/42
CPCH01M4/13H01M4/624H01M4/628H01M4/139H01M4/0404H01M10/0525H01M10/4235H01M2004/021H01M2004/027Y02E60/10
Inventor 陈凯李峥刘京亮冯玉川何泓材
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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