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Method for preparing anode composite material for lithium sulfur secondary batteries

A lithium-sulfur secondary battery and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the complex and cumbersome preparation of SBA-15, achieve the effects of improved electrochemical performance, simple process, and low production cost

Active Publication Date: 2010-10-20
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nazar et al. first utilized a composition of SiO 2 The hard template SBA-15 is used to synthesize CMK-3, but the preparation of SBA-15 in the experiment is complicated and cumbersome

Method used

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  • Method for preparing anode composite material for lithium sulfur secondary batteries
  • Method for preparing anode composite material for lithium sulfur secondary batteries
  • Method for preparing anode composite material for lithium sulfur secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Nano SiO 2 ball preparation

[0028] Add 20ml of deionized water and 20ml of ammonia water to 500ml of absolute ethanol. The mass percentage concentration of ammonia water is 25%. After stirring evenly, add 40ml of ethyl orthosilicate, continue stirring for 48 hours, and then centrifuge and dry to obtain SiO 2 ball. SiO 2 shape of the ball see figure 1 .

[0029] 2)SiO2 2 Preparation of -C core-shell composites

[0030] Mix equal masses of glucose and nano-SiO 2 Mix the balls in 30ml of deionized water and react at 180°C for 10 hours. The reaction product is cooled, centrifuged, dried, and then calcined at 850°C for 5 hours to obtain SiO 2 -C core-shell structure composites. SiO 2 The morphology of -C core-shell composites is shown in figure 2 .

[0031] 3) Preparation of hollow carbon materials

[0032] SiO 2 -C core-shell structure composite material is etched for 24 hours with a mass percent concentration of 8% HF solution to obtain a hollow carbon m...

Embodiment 2

[0039] 1) Nano SiO 2 ball preparation

[0040] Add 15ml of deionized water and 15ml of ammonia water to 500ml of absolute ethanol, the mass percentage concentration of ammonia water is 20%, add 30ml of ethyl orthosilicate after stirring, centrifuge after stirring for 36 hours, and dry to obtain SiO 2 ball. Obtained SiO 2 The shape of the ball and figure 1 resemblance.

[0041] 2)SiO2 2 Preparation of -C core-shell composites

[0042] Equivalent amounts of sucrose and nano-SiO2 Mix the balls in 30ml of deionized water. After reacting at 170°C for 10 hours, the reaction product is cooled, centrifuged, dried, and then calcined at 800°C for 5 hours to obtain SiO 2 -C core-shell structure composites. Prepared SiO 2 Morphology of -C core-shell composites figure 2 resemblance.

[0043] 3) Preparation of hollow carbon materials

[0044] SiO 2 The -C core-shell structure composite material is etched with a KOH solution with a mass percent concentration of 10 mol / L at 60°C ...

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Abstract

The invention discloses a method for preparing an anode composite material for lithium sulfur secondary batteries, which comprises the following steps: 1) hydrolyzing ethyl orthosilicate to obtain nano SiO2 spheres; 2) mixing solution of a carbon source with the nano SiO2 spheres and heating the mixture to react the solution of the carbon source with the nano SiO2 spheres; 3) cooling, centrifuging, drying, calcining and carbonizing the product obtained by the previous step to obtain a SiO2-C core-shell structure material; 4) etching the SiO2-C core-shell structure material by using solution of HF, NaOH or KOH to obtain a hollow carbon sphere material; and 5) grinding and mixing sulfur and the hollow carbon sphere material, placing the mixture in a sealed container filled with an Ar gas, heating the mixture and casting the melt to obtain a S-C composite material. The method has the advantages that: 1) the process is simple; 2) the raw material is cheap and readily available and the production cost is low; and 3) the composite material has a special core-shell structure and therefore inhibits the loss of active materials, improves the conductive performance of the material and obviously improves the electrochemical performance of electrodes.

Description

technical field [0001] The invention relates to the preparation of Li-S secondary battery electrode materials, in particular to a preparation method for positive electrode composite materials of lithium-sulfur secondary batteries. Background technique [0002] The current commercialized lithium-ion secondary battery cathode material is LiCoO 2 , LiMn 2 o 4 and LiFePO 4 Wait. But LiCoO 2 There are safety issues and high cost, LiMn 2 o 4 The reversible cycle performance of LiFePO is poor 4 The theoretical specific capacity is not high, only 170mAh / g, which limits its application in hybrid electric vehicles and large reserve power sources. Li-S secondary batteries with high energy density have attracted people's attention again in recent years. Elemental sulfur is not only rich in natural reserves and low in price, but also has a theoretical specific capacity of 1672mAh / g, and the theoretical energy density of a battery system composed of lithium metal will reach 2600W...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 魏进平靳佳周震秦杏邢丽英
Owner NANKAI UNIV
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