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Bismuth-doped argyrodite type sulfide solid electrolyte and preparation method thereof

A solid-state electrolyte, silver-sulfur germanium ore technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of long-term stability and cyclability being difficult to guarantee, restricting lithium-sulfur solid electrolytes, and poor chemical stability. Achieve good ionic conductivity, solve the effects of poor lithium metal stability and low cost

Pending Publication Date: 2022-07-05
SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 2 S, P 2 S 5 The disadvantage of the lithium-sulfur system is that it is easy to hydrolyze and oxidize, resulting in poor chemical stability, and it is difficult to guarantee long-term stability and cycle performance, which restricts the application of lithium-sulfur solid electrolytes.

Method used

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  • Bismuth-doped argyrodite type sulfide solid electrolyte and preparation method thereof
  • Bismuth-doped argyrodite type sulfide solid electrolyte and preparation method thereof
  • Bismuth-doped argyrodite type sulfide solid electrolyte and preparation method thereof

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Embodiment 1

[0034] The present embodiment provides a method for preparing a bismuth-doped arginite-type solid electrolyte, which specifically includes the following steps:

[0035] Step 1. Put Li 2 S.P 2 S 5 , Bi 2 S 3 , LiCl according to the molar ratio of 2.55:0.475:0.025:1 in an argon atmosphere to grind and mix to obtain mixed powder. Sealed in a ball mill jar;

[0036] Step 2. Use a ball mill to mill the mixed powder. The rotating speed of the ball mill is 400rpm, and the ball milling time is 24 hours;

[0037] Step 3, compressing the above mixed powder into a tablet and packing it into a closed container, vacuuming and packaging;

[0038] Step 4. Heating to 550°C for solid-phase reaction for 8 hours;

[0039] Step 5. After the reaction is finished, it is naturally cooled to room temperature to obtain the composition of Li 6.1 Bi 0.05 P 0.95 S 5 Cl-doped bismuth-silver-germanite-type solid-state electrolyte material.

[0040] Step 6. Press the solid electrolyte powder ob...

Embodiment 2

[0042] The present embodiment provides a method for preparing a bismuth-doped arginite-type solid electrolyte, which specifically includes the following steps:

[0043] Step 1. Put Li 2 S.P 2 S 5 , Bi 2 S 3 , LiCl according to the molar ratio of 2.6:0.45:0.05:1 in an argon atmosphere to grind and mix to obtain mixed powder. Sealed in a ball mill jar;

[0044] Step 2. Use a ball mill to mill the mixed powder. The rotating speed of the ball mill is 400rpm, and the ball milling time is 24 hours;

[0045] Step 3, compressing the above mixed powder into a tablet and packing it into a closed container, vacuuming and packaging;

[0046] Step 4. Heating to 550°C for solid-phase reaction for 8 hours;

[0047] Step 5. After the reaction is finished, it is naturally cooled to room temperature to obtain the composition of Li 6.2 Bi 0.1 P 0.9 S 5 Cl-doped bismuth-silver-germanite-type solid-state electrolyte material.

[0048] Step 6. Press the solid electrolyte powder obtaine...

Embodiment 3

[0050] The present embodiment provides a method for preparing a bismuth-doped arginite-type solid electrolyte, which specifically includes the following steps:

[0051] Step 1. Put Li 2 S.P 2 S 5 , Bi 2 S 3 , LiCl according to the molar ratio of 2.65:0.425:0.075:1 in an argon atmosphere to grind and mix to obtain a mixed powder. Sealed in a ball mill jar;

[0052] Step 2. Use a ball mill to mill the mixed powder. The rotating speed of the ball mill is 400rpm, and the ball milling time is 24 hours;

[0053] Step 3, compressing the above mixed powder into a tablet and packing it into a closed container, vacuuming and packaging;

[0054] Step 4. Heating to 550°C for solid-phase reaction for 8 hours;

[0055] Step 5. After the reaction is finished, it is naturally cooled to room temperature to obtain the composition of Li 6.3 Bi 0.15 P 0.85 S 5 Cl-doped bismuth-silver-germanite-type solid-state electrolyte material.

[0056] Step 6. Press the solid electrolyte powder ...

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Abstract

The invention provides a novel bismuth-doped argyrodite type solid electrolyte and a preparation method thereof, the chemical general formula of the bismuth-doped argyrodite type solid electrolyte is Li < x > Bi < y > P < 1-y > S5Cl, xlt; 6.5, 0 lt; yt; Yt; and 0.5. The bismuth-doped argyrodite type solid electrolyte has good mechanical performance, excellent ionic conductivity and good electrochemical stability, the preparation method is simple and easy to implement, large-scale industrial production is facilitated, and the bismuth-doped argyrodite type solid electrolyte can be used as an ideal electrolyte material of an all-solid-state lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a bismuth-doped silver-germanite type sulfide solid-state electrolyte and a preparation method thereof, in particular to a solid electrolyte material with high electrical conductivity that is convenient for large-scale production and can be used for all-solid-state lithium batteries and a method for preparing the same. its preparation method. Background technique [0002] Lithium-ion batteries have now occupied the electric vehicle market in my country, and are also being applied in the grid energy storage market on a large scale. Battery technology is one of the key technologies to solve the current energy problem. In electric vehicles, energy density is the first indicator of power battery performance, while energy storage batteries pay more attention to cost and safety. With the increase in the sales of electric vehicles, the frequency of safety accidents such as spon...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0562H01M10/058H01M10/0525H01M2300/0068Y02P70/50Y02E60/10
Inventor 张希朱金辉陈振营
Owner SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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