A composite solid-state electrolyte for all-solid-state lithium ion batteries and a preparation method thereof

A solid-state electrolyte, lithium-ion battery technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve problems such as rate discharge capacity and cycle performance decline, high conductivity can not be well exerted, and solid-state battery performance is limited. , to achieve the effect of improved conductivity, high energy density, and improved contact

Inactive Publication Date: 2019-01-22
SAIC GENERAL MOTORS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high flexibility of the organic electrolyte has acceptable interface properties, but the conductivity at room temperature is low, which limits the performance of solid-state batteries; the inorganic solid electrolyte has high room temperature conductivity and lithium ion migration number, but the interface between the electrode material and the The combination is poor, and the advantages of high conductivity cannot be fully utilized
The above problems will lead to an increase in the internal resistance of the solid-state battery, a decrease in the rate discharge capacity and cycle performance

Method used

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  • A composite solid-state electrolyte for all-solid-state lithium ion batteries and a preparation method thereof
  • A composite solid-state electrolyte for all-solid-state lithium ion batteries and a preparation method thereof
  • A composite solid-state electrolyte for all-solid-state lithium ion batteries and a preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1: Preparation of composite solid electrolyte

[0076] Composite solid electrolytes were prepared as follows

[0077] i) Preparation of rare metal-doped inorganic electrolyte powder:

[0078] With 7mmol lithium hydroxide, 2.5mmol lanthanum nitrate, 2mmol zirconium nitrate, 0.5mmol niobium nitrate (that is, molar ratio 7:2.5:2:0.5) and pH buffer (barbital-sodium chloride-hydrochloric acid, adjust pH = 7.5) Disperse evenly in 100ml ethanol aqueous solution (mixing ratio of ethanol and water is 1:1), add urea, and conduct heat treatment at 550°C under argon protection to obtain inorganic electrolyte powder with a particle size of 100-4000 nanometers.

[0079] ii) Forming an inorganic electrolyte layer:

[0080] Add 100 mg of powder obtained in step i) to 800 mg of ethanol and butanone mixed solvent (the mixing ratio of ethanol and butanone is 1:1), add SDS dispersant to make a slurry, and ball mill in a high-energy ball mill for 12 hours to obtain a fine powde...

Embodiment 2

[0086] Embodiment 2: Preparation of all-solid-state lithium-ion battery

[0087] Prepare an all-solid-state lithium-ion battery as follows:

[0088] Cut the aluminum-plastic film into 150*200mm in advance, take the center line of the long side as the axis of symmetry, and punch out two square pits of 102*52mm in the center of the two sides, with a depth of 4mm.

[0089] Put 20 pairs of positive and negative electrodes and electrolytes into the square pit in the order of positive electrode-solid electrolyte layer-negative electrode-solid electrolyte layer, and the laser welding tabs are drawn out of the aluminum-plastic film from above.

[0090] Fold the aluminum-plastic film in half so that all the electrodes fall into the square pit, and vacuumize the edge for the first time.

[0091] The battery is compressed under a pressure of 200kN, and the gas is driven to the first sealing edge.

[0092] The second edge sealing is performed on the inside of the exhausted gas, and the ...

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Abstract

The invention relates to a composite solid-state electrolyte for an all-solid-state lithium ion battery and a preparation method thereof. The composite solid electrolyte comprises an inorganic electrolyte layer and two organic electrolyte layers attached to both surfaces of the inorganic electrolyte layer, the organic electrolyte layer comprising a lithium salt and an organic electrolyte, and theinorganic electrolyte layer is formed of rare metal doped inorganic electrolytes. The battery containing the composite solid electrolyte of the present invention has high energy density and high safety.

Description

technical field [0001] The invention belongs to the field of battery technology. Specifically, the present invention relates to a composite solid electrolyte for an all-solid lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently used as the most important power source in the field of electric vehicles due to their high energy density, power density and good cycle performance. With the continuous advancement of technology, people have higher and higher requirements for the cruising range of electric vehicles, and subsequently put forward higher requirements for the energy density and safety of lithium-ion batteries. [0003] The energy density limit of traditional liquid lithium-ion batteries is only 260wh / kg. In order to increase the energy density of lithium-ion batteries, high-capacity cathode materials and metallic lithium anodes can be used. However, the lithium metal negative electrode reacts with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 白阳周禕闫婉范哲懿
Owner SAIC GENERAL MOTORS
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