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Pre-lithiated tin-lithium alloy nanoparticles for lithium-sulfur batteries, preparation method and application

A nanoparticle, lithium-sulfur battery technology, applied in the field of lithium-ion batteries, can solve the problems of limited chemical adsorption, polysulfide shuttle effect, and material battery performance decline, to reduce the shuttle effect, improve the gram capacity of materials, and reduce stress. Effect

Active Publication Date: 2022-06-17
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the positive electrode materials prepared by the above-mentioned prior art still have disadvantages such as polysulfide shuttle effect and large irreversible capacity. This is because in the prior art, metal / metal oxide materials are physically combined with sulfur, There is no fundamental modification of the positive electrode material. In addition, the traditional metal / metal oxide has limited chemisorption and will induce the formation of lithium dendrites during actual use, which will lead to a decrease in the battery performance of the material.

Method used

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  • Pre-lithiated tin-lithium alloy nanoparticles for lithium-sulfur batteries, preparation method and application
  • Pre-lithiated tin-lithium alloy nanoparticles for lithium-sulfur batteries, preparation method and application
  • Pre-lithiated tin-lithium alloy nanoparticles for lithium-sulfur batteries, preparation method and application

Examples

Experimental program
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Embodiment 1

[0057] The preparation and application of the prelithiated tin-lithium alloy nanocomposite lithium-sulfur positive electrode includes the following steps:

[0058] Weigh the elements of tin, lithium, cobalt, titanium, zinc and manganese according to the mass percentage of 70:10:25:3:5:5, put them into a vacuum melting furnace, and then introduce a high-speed 99.99% nitrogen gas through the aerosol method to prepare the components. Uniform tin-lithium alloy powder. The prepared tin-lithium alloy powder was placed in a stirring ball mill, and ball-milled for 50 hours under the protection of 99.99% nitrogen to prepare black amorphous tin-lithium alloy powder.

[0059] The prepared black amorphous tin-lithium alloy powder was added to single-wall carbon nanotube (SCNT, Single Wall Carbon Nanotube) at 5% by mass, and ball-milled for 50 hours under the protection of 99.99% nitrogen to prepare black powder.

[0060] Mix the prepared mixed powder with elemental sulfur in a mass perce...

Embodiment 2

[0066] The preparation conditions of the prelithiated tin-lithium alloy nanocomposite lithium-sulfur positive electrode are the same as those in Example 1, the difference is: tin, lithium, cobalt and iron are weighed according to the mass percentage of 80:5:10:5, and the preparation is uniform in composition. tin-lithium alloy powder. The fabrication of other pole pieces and the assembly of the battery are the same as those of Example 1.

[0067] image 3 It is the SEM image of the amorphous tin-lithium alloy prepared in Example 2.

Embodiment 3

[0069] The preparation conditions of the pre-lithiated tin-lithium alloy nanocomposite lithium-sulfur positive electrode are the same as those in Example 1, the difference is: tin, lithium, cobalt and aluminum are weighed according to the mass percentage of 60:20:15:5, and the preparation is uniform in composition. tin-lithium alloy powder. The fabrication of other pole pieces and the assembly of the battery are the same as those of Example 1.

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Abstract

The invention discloses the preparation and application of prelithiated tin-lithium alloy nanocomposite lithium-sulfur positive electrode, which includes the following steps: 1) preparing amorphous tin-lithium alloy nanoparticles; 2) preparing amorphous tin-lithium alloy / conductive agent nanocomposite material ; 3) Preparation of amorphous tin-lithium alloy / conductive agent / sulfur nanocomposite cathode material; 4) Preparation of pre-lithiated tin-lithium alloy nanocomposite lithium-sulfur cathode; 5) Preparation of pre-lithiated lithium-sulfur battery, and the prepared pre-lithium Lithium-sulfide batteries have good gram capacity and cycle performance, and tin-lithium alloys have good application prospects in lithium-sulfur batteries.

Description

Technical field [0001] The invention belongs to the field of lithium-ion batteries, and specifically relates to prelithiated tin-lithium alloy nanoparticles for lithium-sulfur batteries, preparation methods and applications. Background technique [0002] Lithium-ion secondary batteries have been increasingly used in 3C and power battery fields in recent years. Improving battery energy density and cycle performance is an important direction for lithium-ion secondary batteries. The lithium-sulfur battery's positive electrode elemental sulfur (S) has a theoretical capacity of 1675mAh / g, and the theoretical mass energy density of the lithium-sulfur battery composed of metallic lithium (Li) is 2600Wh / kg, and the volume energy density is 2800Wh / L, which has good application prospects. [0003] However, lithium-sulfur batteries face many problems during use. First of all, elemental sulfur is an insulator, with a conductivity of 5×10 at room temperature. -30 S.cm -1 , the discha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/40H01M4/38H01M10/0525H01M10/0587H01M10/42B22F1/054B22F9/04B22F9/08C22C13/00B82Y30/00B82Y40/00
CPCH01M4/405H01M4/387H01M10/0587H01M10/0525H01M10/4235B22F9/04B22F9/082C22C13/00B82Y30/00B82Y40/00B22F2009/043B22F1/054Y02P70/50Y02E60/10
Inventor 徐士民吕菲徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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