Preparation method of composite negative electrode of lithium battery

A lithium battery and negative electrode technology, applied in the field of composite negative electrode preparation, can solve the problem that high flexibility and high conductivity cannot coexist, and achieve the effects of improving mechanical strength and flexibility, high ionic conductivity, and reducing interface ionic impedance

Active Publication Date: 2021-12-17
福建巨电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a composite negative electrode of a lithium battery, which overcomes the defect that high flexibility and high conductivity cannot coexist in existing solid-state lithium batteries

Method used

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  • Preparation method of composite negative electrode of lithium battery
  • Preparation method of composite negative electrode of lithium battery

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preparation example Construction

[0016] refer to figure 1 , a preparation method of a composite negative electrode of a lithium battery, comprising the following steps:

[0017] S1: Preparation of inorganic solid electrolytes by electrospinning;

[0018] S2: composite zinc oxide, organic solid electrolyte and lithium salt on the surface of inorganic solid electrolyte by solution casting method to obtain composite solid electrolyte;

[0019] S3: Cast molten metal lithium on one side of the composite solid electrolyte, and cold press to obtain a composite solid electrolyte-metal lithium composite negative electrode.

[0020] The working principle of the present invention is to improve the compatibility between the organic-inorganic phases by combining the electrospinning technology, and improve the flexibility of the composite solid electrolyte on the premise of ensuring the high conductivity of lithium ions in the composite solid electrolyte. Zinc oxide is added to the organic solid electrolyte to reduce the...

Embodiment 1

[0040] A method for preparing a composite negative electrode of a lithium battery, comprising the following steps:

[0041] S1: Preparation of inorganic solid electrolyte 1 by electrospinning; specifically, mixing LLTO, polyacrylonitrile and N-methylpyrrolidone at a weight ratio of 10:3:100 to obtain a mixed solution, and the mixed solution was tested at a high voltage of 13kV Electrospinning spraying was carried out to spray the mixed solution onto the aluminum foil. After the solution was sprayed completely, the inorganic solid electrolyte 1 was peeled off from the aluminum foil, transferred to a vacuum drying oven, and vacuum-dried at 60°C for 24 hours before disposal.

[0042]S2: Composite zinc oxide 2, organic solid electrolyte 3 and lithium salt on the surface of inorganic solid electrolyte 1 by solution casting method to obtain composite solid electrolyte 4; specifically, zinc oxide 2, polyethylene oxide, LiSCN, N- Methylpyrrolidone was mixed uniformly at a weight ratio...

Embodiment 2

[0045] A method for preparing a composite negative electrode of a lithium battery, comprising the following steps:

[0046] S1: Preparation of inorganic solid electrolyte 1 by electrospinning; specifically, mixing LGPS, polyvinylidene fluoride and N,N-dimethylformamide at a weight ratio of 20:6:200 to obtain a mixed solution, the mixed solution Electrospinning spraying was carried out at a high voltage of 15kV, so that the mixed solution was sprayed onto the aluminum foil. After the solution was sprayed completely, the inorganic solid electrolyte 1 was peeled off from the aluminum foil, and transferred to a vacuum drying oven for vacuum drying at 70°C. After 32 hours, process it for later use.

[0047] S2: Composite zinc oxide 2, organic solid electrolyte 3 and lithium salt on the surface of inorganic solid electrolyte 1 by solution casting method to obtain composite solid electrolyte 4; specifically, zinc oxide 2, polymethyl methacrylate, LiAsF6 and N , N-dimethylformamide w...

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Abstract

The invention discloses a preparation method of a composite negative electrode of a lithium battery. The preparation method comprises the following steps: S1, preparing an inorganic solid electrolyte through an electrostatic spinning method; S2, compounding zinc oxide, an organic solid electrolyte and a lithium salt to the surface of the inorganic solid electrolyte through a solution casting method to obtain a composite solid electrolyte; and S3, casting metal lithium in a molten state on one side of the composite solid electrolyte, and performing cold press molding to obtain the composite solid electrolyte-metal lithium composite negative electrode. The lithium battery negative electrode prepared by the invention has good conductivity and good flexibility.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a composite negative electrode of a lithium battery. Background technique [0002] Lithium-ion batteries are widely used in different fields, such as digital products, power, energy storage and other fields. However, the electrolyte of traditional lithium-ion batteries is a liquid electrolyte, which not only contains flammable organic substances, but also generates heat and is extremely unstable during charging and discharging, posing safety hazards. [0003] Compared with traditional liquid lithium-ion batteries, solid-state lithium-ion batteries use solid-state electrolytes, which avoid the risks of liquid electrolyte leakage and fire; because solid-state lithium-ion batteries do not use the diaphragm and electrolyte in traditional liquid lithium-ion batteries, the battery It can be lighter and thinner, and the energy density of the battery cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/052D01D5/00
CPCH01M10/056H01M10/058H01M10/052D01D5/003H01M2300/0065H01M2300/0094Y02E60/10Y02P70/50
Inventor 张筱烨张劢魏佳骏瞿诗鹏吴彬杰杨德财
Owner 福建巨电新能源股份有限公司
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