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Electrolyte preparation method for inhibiting self-discharge of solid lithium battery

A solid electrolyte and self-discharge technology, which is applied in electrolytes, secondary batteries, circuits, etc., can solve the problem that the self-discharge of solid-state lithium batteries is difficult to effectively control

Inactive Publication Date: 2020-03-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem that the self-discharge of the existing solid-state lithium battery is difficult to effectively control, the present invention proposes a method for preparing an electrolyte that inhibits the self-discharge of the solid-state lithium battery

Method used

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  • Electrolyte preparation method for inhibiting self-discharge of solid lithium battery
  • Electrolyte preparation method for inhibiting self-discharge of solid lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (a). Take V respectively 2 o 5 Powder, carbon black, and tungsten oxide powder were passed through a 300-mesh sieve, and the under-sieve was taken, and 270g of V 2 o 5 Mix the powder with 8g of carbon black and 10g of tungsten oxide powder under the condition of ammonia gas, and carry out dry ball milling in a ball mill, and the time of dry ball milling is 20 minutes;

[0035] (b). Place the powder after dry ball milling in step (a) under the protection of nitrogen for heat reduction, and the heat reduction temperature is 750°C to obtain V 0.95 W 0.05 o 2 powder;

[0036] (c). The V described in step (b) 0.95 W 0.05 o 2 Powder 100g is mixed with 10g sodium carboxymethylcellulose and pressed into a film of 0.25mm, Li 2 O, La 2 o 3 , ZrO 2 According to the molar ratio of Li:La:Zr=7.7:3:2, 500g of powder mixed with 50g of sodium carboxymethylcellulose was mixed and pressed into a 2mm film, and the two films were laminated and compacted into a 2.5mm sheet .

...

Embodiment 2

[0040] (a). Take V respectively 2 o 5 Powder, carbon black, and tungsten oxide powder were passed through a 300-mesh sieve, and the under-sieve was taken, and 270g of V 2 o 5 Mix the powder with 10g of carbon black and 3.5g of tungsten oxide powder under the condition of ammonia gas, and carry out dry ball milling in a ball mill, and the time of dry ball milling is 20 minutes;

[0041] (b). Place the powder after dry ball milling in step (a) under the protection of nitrogen for heat reduction, and the heat reduction temperature is 750°C to obtain V 0.98 W 0.02 o 2 powder;

[0042] (c). The V described in step (b) 0.98 W 0.02 o 2 Powder 75g is mixed with 7.5g sodium carboxymethylcellulose and pressed into a film of 0.3mm, Li 2 O, La 2 o 3 , ZrO 2 According to the molar ratio of Li:La:Zr=7.7:3:2, 500g of powder mixed with 50g of sodium carboxymethyl cellulose was mixed and pressed into a 2.3mm film, and the two films were laminated and compacted into a 2.9mm film. F...

Embodiment 3

[0046] (a). Take V respectively 2 o 5 Powder, carbon black, and tungsten oxide powder were passed through a 300-mesh sieve, and the under-sieve was taken, and 250g of V 2 o 5 Mix the powder with 10g of carbon black and 6.5g of tungsten oxide powder under the condition of ammonia gas, and carry out dry ball milling in a ball mill, and the time of dry ball milling is 20 minutes;

[0047] (b). Place the powder after dry ball milling in step (a) under the protection of nitrogen for heat reduction, and the heat reduction temperature is 750°C to obtain V 0.97 W 0.03 o 2 powder;

[0048] (c). The V described in step (b) 0.97 W 0.03 o 2 Powder 100g is mixed with 10g sodium carboxymethylcellulose and pressed into a film of 0.4mm, Li 2 O, La 2 o 3 , ZrO 2 According to the molar ratio of Li:La:Zr=7.7:3:2, 500g of powder mixed with 50g of sodium carboxymethylcellulose was mixed and pressed into a 2.5mm film, and the two films were laminated and compacted into a 3.3mm film. Fl...

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Abstract

The invention relates to the technical field of inhibition of self-discharge of solid-state lithium batteries, in particular to an electrolyte preparation method for inhibiting self-discharge of a solid lithium battery. The preparation method comprises the following steps: (a) mixing V2O5 powder with carbon black and tungsten oxide powder under the condition of ammonia gas and carrying out dry ball milling; (b) heating and reducing the powder subjected to dry ball milling in the step (a) under the protection of nitrogen to obtain V1-xWxO2 powder, wherein x is more than 0.01 and less than 0.05;(c) mixing the V1-xWxO2 powder obtained in the step (b) with a solid electrolyte raw material and pressing the mixture into a sheet shape through a mold; and (d) sintering the sheet obtained in the step (c) at 950 DEG C, carrying out subsequent washing, drying and impurity removal on the sintered sheet and carrying out composite packaging on the sheet and positive and negative electrodes to prepare the solid battery. With application of the method, the self-discharge of the battery can be reduced and the reversible change of the conductivity of the internal resistance of the battery between normal-temperature standing and the working temperature zone can be realized.

Description

technical field [0001] The invention relates to the technical field of inhibiting the self-discharge of solid-state lithium batteries, in particular to an electrolyte preparation method for inhibiting the self-discharge of solid-state lithium batteries. Background technique [0002] Lithium-ion batteries have high energy density, strong stability, no memory effect, and long cycle life, and have been widely used as a commercial high-efficiency energy storage device. The electrolyte used in traditional lithium-ion batteries is liquid lithium hexafluorophosphate. Because it is extremely unstable, it is easy to decompose and cause battery inflation. At the same time, it is easy to burn and explode under high temperature, short circuit, overcharge or physical collision. Although the protection mechanism is added through external packaging, it still has a large security risk. Solid-state lithium-ion batteries use solid electrolytes instead of liquid electrolytes, which can fundam...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 陈庆廖健淞何方陈涛曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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