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

A technology of solid electrolyte and lithium ion battery, which is applied in the direction of solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc. It can solve the problems of few sources, high price, cumbersome preparation process, etc., and achieve the effect of improving efficiency and improving effect

Active Publication Date: 2020-08-04
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 lithium ion battery, solid electrolyte compound and preparation method
  • All-solid lithium ion battery, solid electrolyte compound and preparation method
  • All-solid lithium ion battery, solid electrolyte compound and preparation method

Examples

Experimental program
Comparison scheme
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 grams of lithium source compound lithium sulfide, 1.394 grams of phosphorus source compound phosphorus pentasulfide, and 0.225 grams of 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 hours, 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 body of the solid electrolyte material has a thickness of 0.78 mm and an electrode area of ​​113.1 mm2.

Embodiment 3

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

[0071] 1.021 grams of lithium source compound lithium sulfide, 1.394 grams of phosphorus source compound phosphorus pentasulfide, and 0.274 grams of 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 hours on a heating table in a glove box. ℃ heat treatment for 3 hours, and the obtained powder was molded under the pressure of 150MPa 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 lithium ion battery, a solid electrolyte compound and a preparation method. The method includes: according to xLi 2 S‑(100‑x)P 2 S 5 The stoichiometric ratio of the lithium source compound and the phosphorus source compound are mixed so as to form a raw material mixture, wherein x and 100-x are stoichiometric ratios, and the value range of x is 65-85; the raw material mixture is ball milled processing to obtain a ball-milled product; and performing low-temperature heat treatment on the ball-milled product to obtain the compound, wherein the temperature of the low-temperature heat treatment is not higher than 300 degrees Celsius. The compound for solid electrolyte has the advantages of high ion 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 Patents(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