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All-solid-state lithium-ion battery, solid electrolyte compound and preparation method

A solid-state electrolyte, lithium-ion battery technology, applied in solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte and other directions, can solve the problems of high price, few sources, cumbersome preparation process, etc., to improve the effect and improve the efficiency.

Active Publication Date: 2017-02-22
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this problem can be improved to a certain extent by doping in solid electrolyte materials, the current doping elements have problems such as few sources and high prices, and the preparation of solid electrolyte materials requires a high temperature heat treatment process. , cumbersome preparation process and other issues

Method used

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  • All-solid-state lithium-ion battery, solid electrolyte compound and preparation method
  • All-solid-state lithium-ion battery, solid electrolyte compound and preparation method
  • All-solid-state lithium-ion battery, solid electrolyte compound and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Embodiment 1, preparation Li 2 S-P 2 S 5 solid electrolyte compound

[0067] 1.195 g of the lithium source compound lithium sulfide and 1.630 g of the phosphorus source compound phosphorus pentasulfide were milled by a high-energy ball mill at 520 rpm for 25 hours, and then heat-treated at 170°C for 0.5 hour and 240°C for 3 hours on a heating table in a glove box to obtain a powder Molded under the pressure of 150MPa at room temperature for 3 minutes to obtain 78Li 2 S-22P 2 S 5 The green body of solid electrolyte material has a thickness of 0.80mm and an area of ​​113.1mm2. Scanning electron microscope tests were carried out on the samples after ball milling and the samples after heat treatment, and the test results were as follows: image 3 shown. Heat-treated samples (refer to image 3 (b)) has denser porosity; Simultaneously, as previously mentioned, the XRD diffraction pattern of the sample through heat treatment has appeared high conductive phase, therefor...

Embodiment 2

[0068] Embodiment 2, preparation aluminum element doping Li 2 S-P 2 S 5 solid electrolyte compound

[0069] 1.021 g of the lithium source compound lithium sulfide, 1.394 g of the phosphorus source compound phosphorus pentasulfide, and 0.225 g of the aluminum source compound aluminum sulfide were high-energy ball milled at 520 rpm for 25 hours, and then heat-treated on a heating table in a glove box at 170°C for 0.5 hour, 240 ℃ heat treatment for 3 hours, and the obtained powder was molded under the pressure of 150MPa at room temperature for 3 minutes to obtain Al-doped 78Li 2 S-22P 2 S 5 The green body of solid electrolyte material has a thickness of 0.78 mm and an electrode area of ​​113.1 mm2.

Embodiment 3

[0070] Embodiment 3, preparation tin element doping Li 2 S-P 2 S 5 solid electrolyte compound

[0071] 1.021 g of the lithium source compound lithium sulfide, 1.394 g of the phosphorus source compound phosphorus pentasulfide, and 0.274 g of the tin source compound tin disulfide were subjected to high-energy ball milling at 520 rpm for 25 hours, and then heat-treated at 170° C. for 0.5 hour on a heating table in a glove box. ℃ heat treatment for 3 hours, and the obtained powder was molded under the pressure of 150 MPa at room temperature for 3 minutes to obtain Sn-doped 78Li 2 S-22P 2 S 5The body of solid electrolyte material has a thickness of 0.80 mm and an electrode area of ​​113.1 mm2.

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Abstract

The invention provides an all-solid-state lithium-ion battery, a solid electrolyte compound and a preparation method. The method comprises the steps of mixing a lithium source compound with a phosphorus source compound at a stoichiometric ratio of xLi2S-(100-x)P2S5 to form a raw material mixture, wherein x and 100-x are the stoichiometric ratios and the value range of the x is 65-85; carrying out ball-milling treatment on the raw material mixture to obtain a ball-milling product; and carrying out low-temperature thermal treatment on the ball-milling product to obtain the compound, wherein the temperature of the low-temperature thermal treatment is not greater than 300 DEG C. The compound for a solid electrolyte has the advantages of high ionic conductivity, low production cost and the like.

Description

technical field [0001] The present invention relates to the field of energy materials, specifically, the present invention relates to the field of lithium-ion batteries, and more specifically, relates to all-solid-state lithium-ion batteries, solid-state electrolyte compounds and preparation methods. Background technique [0002] Due to its good battery performance, lithium-ion batteries occupy an important position in the field of new energy, and are widely used in mobile phones, notebook computers, digital cameras, wearable smart devices and other equipment. In recent years, electronic devices have gradually developed toward miniaturization and integration, which has put forward more stringent requirements for the structure and performance of lithium-ion batteries. [0003] At present, lithium-ion batteries widely used in the market use liquid or gel electrolytes. The common feature of both is the use of flammable and explosive organic substances with certain fluidity as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 南策文张益博陈儒君刘亭沈洋林元华崔跃
Owner TSINGHUA UNIV