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Pre-lithiated tin-lithium alloy nanoparticle for lithium-sulfur battery, and preparation method and application thereof

A nanoparticle, lithium-sulfur battery technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of polysulfide shuttle effect, limited chemical adsorption, and degradation of battery performance of materials , to achieve the effect of reducing the shuttle effect, increasing the gram capacity of the material, and reducing the stress

Active Publication Date: 2021-06-15
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 nanoparticle for lithium-sulfur battery, and preparation method and application thereof
  • Pre-lithiated tin-lithium alloy nanoparticle for lithium-sulfur battery, and preparation method and application thereof
  • Pre-lithiated tin-lithium alloy nanoparticle for lithium-sulfur battery, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The preparation and application of the lithium-sulfur positive electrode of the pre-lithiated tin-lithium alloy nanocomposite material comprise the following steps:

[0058] Weigh the tin, lithium, cobalt, titanium, zinc and manganese elemental substances according to the mass percentage of 70:10:25:3:5:5, put them into the vacuum melting furnace, and then inject high-speed 99.99% nitrogen gas through the aerosol method to prepare the ingredients 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] Prepared black amorphous tin-lithium alloy powder by adding 5% by mass of single wall carbon nanotube (SCNT, Single Wall Carbon Nanotube), under the protection of nitrogen 99.99%, ball milling for 50 hours to prepare black powder.

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

Embodiment 2

[0066] The preparation conditions of the lithium-sulfur positive electrode of the pre-lithiated tin-lithium alloy nanocomposite material are the same as in Example 1, except that the simple substances of tin, lithium, cobalt and iron are weighed according to the mass percentage of 80:5:10:5 to prepare a uniform composition tin-lithium alloy powder. Other pole piece making and battery assembly are all the same as embodiment 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 lithium-sulfur positive electrode of the pre-lithiated tin-lithium alloy nanocomposite material are the same as in Example 1, the difference is that the tin, lithium, cobalt and aluminum elements are weighed according to the mass percentage of 60:20:15:5, and the preparation is uniform. tin-lithium alloy powder. Other pole piece making and battery assembly are all the same as embodiment 1.

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Abstract

The invention discloses a preparation method and application of a pre-lithiated tin-lithium alloy nanocomposite lithium-sulfur positive electrode. The preparation method comprises the following steps: 1) preparing amorphous tin-lithium alloy nanoparticles; (2) preparing an amorphous tin-lithium alloy / conductive agent nanocomposite material; (3) preparing an amorphous tin-lithium alloy / conductive agent / sulfur nano composite positive electrode material; (4) preparing a pre-lithiated tin-lithium alloy nanocomposite material lithium-sulfur positive electrode; and 5) preparing the pre-lithiated lithium-sulfur battery. The prepared pre-lithiated lithium-sulfur battery has good gram volume and cycle performance, and the tin-lithium alloy has a good application prospect in the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a pre-lithiated tin-lithium alloy nanoparticle for a lithium-sulfur battery, a preparation method and an application thereof. Background technique [0002] Lithium-ion secondary batteries have been more and more used in the field of 3C and power batteries in recent years. Improving battery energy density and cycle performance is an important direction for lithium-ion secondary batteries. The lithium-sulfur battery positive electrode elemental sulfur (S) has a theoretical capacity of 1675mAh / g, and the lithium-sulfur battery composed of metal lithium (Li) has a theoretical mass energy density of 2600Wh / kg and a volumetric energy density of 2800Wh / L, which has a good application prospect. [0003] However, lithium-sulfur batteries face many problems during use. First, elemental sulfur is an insulator, and its conductivity at room temperature is 5×10 -30 S.cm -1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/40H01M4/38H01M10/0525H01M10/0587H01M10/42B22F1/00B22F9/04B22F9/08C22C13/00B82Y30/00B82Y40/00
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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