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Preparation method of high-capacity high-safety solid-state lithium battery

A solid-state lithium, high-capacity technology, applied in the field of green energy storage, can solve the problems of capacity attenuation, energy density mismatch between volume and gravity, etc., to achieve the effect of reducing internal friction, high yield, and good mechanical properties

Inactive Publication Date: 2018-09-04
武汉新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of lithium-ion batteries still has a mismatch in volume and gravity; for devices with battery requirements, the most challenging thing is the high energy density of electrode materials, such as capacity fading, battery cycle stability and many more

Method used

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  • Preparation method of high-capacity high-safety solid-state lithium battery
  • Preparation method of high-capacity high-safety solid-state lithium battery
  • Preparation method of high-capacity high-safety solid-state lithium battery

Examples

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preparation example Construction

[0029] A method for preparing a high-capacity and high-safety solid-state lithium battery. The liquid metal composite made of liquid metal nanoparticles, carbon nanotubes and graphene is used as the negative electrode active material, and the solid electrolyte is used as the electrolyte. The specific preparation process and the schematic diagram of the solid-state battery structure are as follows: figure 1 shown.

[0030] Further: the preparation method of the liquid metal composite is:

[0031] Step S1: Weigh liquid metal tin and liquid metal gallium according to the mass ratio of 22:3, and add degassed ethanol thiol solvent to it, and then ultrasonically degrade to obtain liquid metal nanoparticles; the degassed ethanol thiol here is Refers to ethanol mercaptan that removes oxygen, generally by passing inert gas such as argon, nitrogen, etc. into the solution to drive away the dissolved oxygen;

[0032] Step S2: adding the liquid metal nanoparticles and carbon nanotubes to...

Embodiment 1

[0040] Example 1. Weigh liquid metal tin and liquid metal gallium in an Eppendorf bottle according to the mass ratio of 22:3, then add 1 mmol / L degassed ethanol mercaptan as a solvent, and then ultrasonicate at 50°C for 1 hour to form liquid metal nanoparticles, such as figure 2 As shown, the prepared liquid metal particles are well dispersed and uniform in particle size, which can meet the requirements of battery active materials;

[0041] 60 mg of the liquid metal nanoparticles and 12 mg of carbon nanotubes were added to 0.5 mL of absolute ethanol to form a mixture I; in order to obtain a more uniform suspension, the mixture I was sonicated for 1 hour; at the same time, in order to obtain a more pure carbon , before using the carbon nanotubes, the carbon nanotubes were refluxed with 2.6mol / L nitric acid; then the mixture I was washed repeatedly with deionized water, and then 4mg of graphene was dissolved in 2wt% ethanol, 2wt% means that the mass percentage is 2%, and it is...

Embodiment 2

[0046] Example 2. Weigh liquid metal tin and liquid metal gallium in an Eppendorf bottle according to the mass ratio of 22:3, then add 1 mmol / L degassed ethanol mercaptan as a solvent, and then ultrasonicate at 50°C for 1 hour to form liquid metal nanoparticles;

[0047] 60 mg of the liquid metal nanoparticles and 12 mg of carbon nanotubes were added to 0.5 mL of absolute ethanol to form a mixture I; in order to obtain a more uniform suspension, the mixture I was sonicated for 1 hour; at the same time, in order to obtain a more pure carbon , before using the carbon nanotubes, the carbon nanotubes were refluxed with 2.6mol / L nitric acid; then the mixture I was washed repeatedly with deionized water, and then 4mg of graphene was dissolved in 2wt% ethanol, And add it into mixture I to form mixture II; ultrasonicate mixture II for 10 minutes, then seal it in a high-temperature reactor and react at a temperature of 160°C for 6h, and then react at a temperature of 900°C for 4h, and ...

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Abstract

The invention relates to a preparation method of a high-capacity high-safety solid-state lithium battery. The high-capacity high-safety solid-state lithium battery is prepared by taking a liquid metalcomplex prepared from liquid metal nanoparticles, carbon nanotubes and graphene as a negative active substance and taking solid electrolyte as an electrolyte. The negative active substance of the solid-state lithium battery adopts liquid metals, the carbon nanotubes and the graphene, wherein liquid metals tin and gallium have high energy density, can provide high capacity for the solid-state lithium battery, and thereby are ideal materials for a lithium battery with high energy density; the carbon nanotubes and the graphene are added to construct a three-dimensional frame which enables the lithium battery to have higher ionic conductivity; in addition, the three-dimensional frame has a complex structure and good mechanical properties, so that lithium dendrites formed on the surface of anode metal lithium can be inhibited, and the safety performance of the battery is improved; the cycle life of the battery is prolonged and the and the stability of the battery is improved; by adopting the solid electrolyte, the interface resistance can be greatly reduced to a great extent.

Description

technical field [0001] The invention belongs to the technical field of green energy storage, and in particular relates to a preparation method of a high-capacity and high-safety solid-state lithium battery. Background technique [0002] In the past few decades, with the development of the times, the requirements for energy density in electronic devices have become higher and higher. Lithium-ion batteries have become the most forward-looking electrical energy storage equipment due to their high conversion rate and environmental friendliness. Lithium-ion batteries also have great development prospects in electric vehicles, small power transmission equipment, and portable mobile energy storage equipment. However, the energy density of lithium-ion batteries still has a mismatch in volume and gravity; for devices with battery requirements, the most challenging thing is the high energy density of electrode materials, such as capacity fading, battery cycle stability etc. Content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/052
CPCH01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 曹元成程时杰
Owner 武汉新能源研究院有限公司
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