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Lithium sulfide series solid electrolyte material added with lithium tin alloy and preparation method thereof

A solid electrolyte, tin alloy technology, used in circuits, electrical components, secondary batteries, etc., to achieve the effect of high lithium ion conductivity

Inactive Publication Date: 2017-05-31
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The research on tin-based materials first originated from Japan Seiko Electronics Industry Co., Ltd., followed by companies such as Sanyo Electric, Matsushita Electric, and Fuji Film (such as the invention patents of CN1930726A and CN101887965A), but these studies only use lithium-tin alloy powder as A battery negative electrode material suitable for lithium ion intercalation, used as negative electrode materials for thermal batteries, lithium ion batteries, lithium ion capacitors, lithium sulfur batteries, and lithium-air batteries to accept the insertion of lithium ions during the charging process, does not involve adding high Lithium tin alloy powders with high lithium content to increase the density of migratable lithium ions in solid electrolytes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Mixed high-energy ball milling process:

[0021] In a glove box with low moisture (≤1ppm) and low oxygen content (≤1ppm) with argon atmosphere protection, the molar ratio of lithium sulfide, phosphorous sulfide, lithium tin alloy powder and sulfur powder is 4:1:0.1: Mixing with 0.05 proportions of ingredients, stirring and mixing, and mixing with zirconia balls with a diameter of 3-10mm and then sealing them in a ball mill tank. The mass ratio of the zirconia balls in the tank to the mixed materials is 4:1; the ball mill tank after sealing In the planetary high-energy ball mill, a dry mixing ball mill is used, and the ball milling time is 6 hours to obtain an amorphous lithium-sulfur-phosphorus-tin mixture;

[0022] 2) Heat treatment process:

[0023] The obtained amorphous lithium-sulfur-phosphorus-tin mixture was sealed in a glove box with low moisture (≤1ppm) and low oxygen content (≤1ppm) protected by an argon atmosphere, and then heated to 160℃ under vacuum for heat t...

Embodiment 2

[0029] Repeat Example 1, the difference is:

[0030] In step 1), lithium sulfide, phosphorous sulfide, lithium tin alloy powder and sulfur powder are mixed in a molar ratio of 2.5:0.5:0.02:0.01;

[0031] In step 2), the heat treatment is performed at 120°C, and the heat treatment time is 5 hours.

[0032] After pressing the solid electrolyte powder prepared in this example into a standard sample, using the CHI660 electrochemical workstation, using the AC impedance method, at a room temperature of 25°C, the ion conductivity of the sample in this embodiment was measured to be 3.5×10 -4 S / cm.

Embodiment 3

[0034] Repeat Example 1, the difference is:

[0035] In step 1), the molar ratio of lithium sulfide, phosphorous sulfide, lithium tin alloy powder and sulfur powder is mixed in a ratio of 3.2:0.8:0.07:0.03; the ball milling time is 10 hours;

[0036] In step 2), heat to 150°C for 4 hours under vacuum conditions after sealing.

[0037] After pressing the solid electrolyte powder prepared in this example into a standard sample, using the CHI660 electrochemical workstation, using the AC impedance method, at room temperature 25°C, the ion conductivity of the sample in this embodiment was measured to be 4.5×10 -4 S / cm.

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Abstract

The invention discloses a lithium sulfide series solid electrolyte material added with lithium tin alloy and a preparation method thereof. The preparation method comprises the following steps that (1) under the atmosphere protection condition, lithium sulfide, phosphorus sulfide, lithium tin alloy powder and sulfur are weighed according to a mol ratio of (2.5 to 4.0):(0.5 to 1.0):(0.02 to 0.1):(0.01 to 0.05); the materials are uniformly mixed to obtain an amorphous lithium sulfur phosphorus and tin mixture; (2) the amorphous lithium sulfur phosphorus and tin mixture is sealed under the atmosphere protection condition; then, the temperature is raised to 120 to 260 DEG C under the vacuum or atmosphere protection condition; heat treatment is performed; the lithium sulfide series solid electrolyte material is obtained. The concentration of migratable lithium irons in the lithium sulfide series solid electrolyte is improved through adding the high-lithium-content lithium tin alloy capable of easily forming the amorphous state, so that the lithium ion conductivity is improved.

Description

Technical field [0001] The invention relates to a lithium sulfide solid electrolyte material, in particular to a lithium sulfide solid electrolyte material added with lithium tin alloy powder and a preparation method thereof. Background technique [0002] High-energy density lithium-ion batteries, as power batteries for electric vehicles, have shown increasingly important market prospects and have received widespread attention. A general lithium-ion battery consists of a positive electrode, a negative electrode, a separator, an organic electrolyte and a sealed casing. Major safety accidents such as fire caused by the flammable organic electrolyte often occur. Although numerous studies have greatly improved the performance of lithium-ion batteries in terms of material modification and battery structure, the safety problems of lithium-ion batteries containing organic electrolytes in use have not been fundamentally solved. [0003] Using solid lithium ion electrolyte materials instea...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 王振宇朱凌云张天锦汪英罗加悦
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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