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Positive electrode composite material for lithium sulfur battery

A composite material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of high cost and poor cycle stability, and achieve the effect of easy operation, stable cycle performance and good cycle performance

Active Publication Date: 2014-12-03
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a positive electrode composite material for lithium-sulfur batteries, which solves the problems of poor cycle stability and high cost of existing lithium-sulfur battery positive electrode materials

Method used

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  • Positive electrode composite material for lithium sulfur battery
  • Positive electrode composite material for lithium sulfur battery
  • Positive electrode composite material for lithium sulfur battery

Examples

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Embodiment 1

[0041] The positive electrode composite material for lithium-sulfur batteries in this embodiment includes the following components by weight: 2.0 g of activated clay and 2.5 g of sublimed sulfur (the mass ratio of activated clay to sublimed sulfur is 4:5).

[0042] The preparation method of the lithium-sulfur battery positive electrode composite material of the present embodiment comprises the following steps:

[0043]1) Pretreatment of matrix materials: take activated clay and place it in a vacuum drying oven, dry it at 60°C for 8 hours, take it out, and ball mill it for 5 hours at a ball-to-material ratio (volume ratio) of 1:1 and a speed of 400r / min to obtain activity Fine clay powder;

[0044] 2) Preparation of composite materials (high-temperature solid-phase method): Accurately weigh 2.0g of activated clay fine powder and 2.5g of sublimed sulfur obtained in step 1), mix and grind evenly, place in an atmosphere furnace, and treat at 155°C for 6 hours , that is, the activ...

Embodiment 2

[0049] The positive electrode composite material for lithium-sulfur batteries in this embodiment includes the following components by weight: 4 g of lithium-based bentonite, and 3.0 g of sublimed sulfur (the mass ratio of lithium-based bentonite to sublimed sulfur is 4:3).

[0050] The preparation method of the lithium-sulfur battery positive electrode composite material of the present embodiment comprises the following steps:

[0051] 1) Pretreatment of matrix materials: take lithium-based bentonite and place it in a vacuum drying oven, dry it at 60°C for 8 hours, take it out, and ball mill it for 6 hours under the conditions of ball-to-material ratio (volume ratio) of 1:3 and rotational speed of 300r / min to obtain Lithium bentonite fine powder;

[0052] 2) Preparation of composite materials (mechanical ball milling method): Accurately weigh 4.0g of lithium-based bentonite fine powder and 3.0g of sublimated sulfur obtained in step 1) in a machine with a ball-to-material ratio...

Embodiment 3

[0056] The positive electrode composite material for lithium-sulfur batteries in this embodiment includes the following components by weight: 2.0 g of calcium-based bentonite and 3.0 g of sublimed sulfur (the mass ratio of calcium-based bentonite to sublimed sulfur is 4:6).

[0057] The preparation method of the lithium-sulfur battery positive electrode composite material of the present embodiment comprises the following steps:

[0058] 1) Pretreatment of matrix materials: take calcium-based bentonite and place it in a vacuum drying oven, dry it at 50°C for 10 hours, take it out, and ball mill it for 2.5 hours at a ball-to-material ratio (volume ratio) of 1:5 and a speed of 600r / min. Get calcium-based bentonite fine powder;

[0059] 2) Preparation of composite materials (liquid phase method): the specific operation process is as follows:

[0060] a. Dissolve 3.0g of sublimed sulfur in 12ml of toluene at 100°C to obtain elemental sulfur-toluene solution;

[0061] b. Accuratel...

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Abstract

The invention discloses a positive electrode composite material for a lithium sulfur battery. The positive electrode composite material comprises, by weight, 4 parts of bentonite and 3-6 parts of elemental sulfur. The positive electrode composite material for the lithium sulfur battery adopts the compounding of bentonite and the elemental sulfur, and the bentonite has large specific surface area and strong adsorption capability, and can well immobilize the elemental sulfur; after the bentonite is compounded with the elemental sulfur, the problem of the loss of active substances due to a too high amount of polysulfide dissolved in an electrolyte in the charge and discharge process of the lithium sulfur process is improved, thereby the battery has good cycle performances, high discharge specific capacity and stable cycle performances; and the bentonite greatly reduces the cost of the positive electrode material as a new matrix of the positive electrode material for synthesizing the lithium sulfur battery. The bentonite has no pollution, so the positive electrode composite material has good economic and environmental benefits, and is suitable for popularization application.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a positive electrode composite material for lithium-sulfur batteries. Background technique [0002] In recent years, due to the increasingly prominent energy issues and environmental issues, the demand for secondary batteries with higher energy density and longer cycle life is increasing for portable electronic products, hybrid vehicles, and large industrial equipment. Conventional commercial Li-ion batteries such as LiMn 2 o 4 and LiFePO 4 etc. Their standard specific capacity is low (148mAh / g, 170mAh / g), which can no longer meet the needs of the market. In contrast, sulfur has a higher standard specific capacity (1675mAh / g), which can be used as a positive electrode material; in addition, environmental friendliness and low price are also the advantages of sulfur. Therefore, lithium-sulfur secondary batteries have attracted widespread attention. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/364H01M4/382H01M4/62H01M10/052Y02E60/10
Inventor 曹朝霞马超尹艳红杨书廷岳红云李向南
Owner HENAN NORMAL UNIV
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