Preparation method of active bamboo charcoal/sulfur composite material and application thereof

A technology of activated bamboo charcoal and composite materials, applied in the direction of electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of low sulfur load, low battery specific capacity, poor conductivity, etc., and achieve energy density and high-power discharge The effects of capacity improvement, specific capacity improvement, and energy density improvement

Inactive Publication Date: 2019-08-02
深圳市高能达电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses bamboo as a raw material, and prepares conductive bamboo charcoal with a porous structure through a one-step method combining high-temperature carbonization and high-temperature activation. problems, and then improve the discharge efficiency, safety performance and energy density of lithium-sulfur primary batteries as a whole, and overcome the shortcomings of low battery specific capacity in the existing primary lithium battery technology

Method used

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  • Preparation method of active bamboo charcoal/sulfur composite material and application thereof
  • Preparation method of active bamboo charcoal/sulfur composite material and application thereof
  • Preparation method of active bamboo charcoal/sulfur composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The first step is to prepare activated bamboo charcoal:

[0036] Cut the dried moso bamboo into small pieces with a diameter of about 2 mm; place it in a tube furnace protected by argon, first pass argon gas into the quartz tube of the tube furnace at a rate of 50 mL / min, and wait until After exhausting the air, keep the same ventilation rate to feed argon, and raise the temperature to 300°C at a rate of 10°C / min; then raise the temperature to 700°C at a rate of 2°C / min, and keep it at this temperature for 1h; Then close the argon inlet valve and open the CO 2 The gas inlet valve is changed to feed CO at a rate of 50mL / min. 2 gas, and heated up to 1000°C at a rate of 10°C, and kept at this temperature for 1 hour. Thus made activated bamboo charcoal with high conductivity and porous structure; (the air inlet valve is a metal three-way air inlet valve)

[0037] The second step is to prepare the positive electrode material of activated bamboo charcoal / sulfur composite l...

Embodiment 2

[0045] Others are the same as embodiment 1, and the difference is the first step:

[0046] Place the chopped moso bamboo fragments in a tube furnace under the protection of argon, first pass argon gas into the quartz tube of the tube furnace at a rate of 50mL / min, after the air is exhausted, keep the same rate of ventilation Inject argon, and raise the temperature to 700°C at a heating rate of 10°C / min, and keep at this temperature for 4.5h.

[0047] image 3 When the activated bamboo charcoal / sulfur composite material prepared in this example is used as the positive electrode of the lithium-sulfur battery, the first discharge curve at a current density of 0.1C. The first discharge specific capacity is 978mAh / g, which is 302mAh / g lower than that of Example 1. This is because the bamboo undergoes a severe dehydration reaction at 300-700°C. It is too late to be discharged with the inert gas, causing the bamboo to become "paste". The bamboo charcoal obtained by carbonization ha...

Embodiment 3

[0049] Others are the same as embodiment 1, and the difference is the second step:

[0050] Weigh the required activated bamboo charcoal and nano-sulfur powder according to the mass ratio of 1:3.

[0051] Figure 4 The first discharge curve at a current density of 0.1C when the activated carbon / sulfur composite material prepared in this example is used as the positive electrode of a lithium-sulfur battery. The lithium-sulfur battery with activated bamboo charcoal / sulfur composite material as the positive electrode has a specific capacity of 998mAh / g for the first time, and the sulfur content is 60wt.%.

[0052] From the above examples, it can be seen that the present invention uses bamboo as a raw material to prepare conductive bamboo charcoal with a porous structure through a one-step process combining high-temperature carbonization and high-temperature activation. Lithium-sulfur batteries prepared from this material as a sulfur-loading material have excellent discharge spe...

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Abstract

The invention relates to a preparation method of an active bamboo charcoal/sulfur composite material and an application thereof. The method comprises steps that S1, the active bamboo charcoal is prepared; and S2, the active bamboo charcoal/sulfur composite material is prepared, the activated bamboo charcoal and the nano-sulfur powder are placed in a ball mill for ball milling for 2-4 hours, the mixture obtained by ball milling is then placed in a reaction vessel taking polytetrafluoroethylene as a substrate for heating and insulation, the reaction time is 10-20 hours, the reaction temperatureis 100-300 DEG C, and the active bamboo charcoal/sulfur composite lithium sulfur battery cathode material is obtained. The method is advantaged in that problems of poor conductivity, severe volume expansion and low sulfur loading of the lithium sulfur primary battery anode material can be effectively solved, discharge efficiency, safety performance and energy density of a lithium sulfur primary battery are improved as a whole, and the shortcoming that the existing battery capacity in the lithium battery technology in the prior art is relatively low is overcome.

Description

technical field [0001] The technical solution of the present invention relates to a preparation method of an electrode material composed of active materials, specifically a preparation method of a lithium-sulfur primary battery positive electrode material, and more specifically a kind of activated bamboo charcoal that can be used for a lithium-sulfur primary battery positive electrode / sulfur composite preparation method. Background technique [0002] Lithium-sulfur battery refers to a battery system that uses sulfur, metal sulfide, polysulfide, and organic polysulfide as the positive electrode, and metal lithium or lithium alloy foil as the negative electrode. It has the characteristics of high specific capacity and high energy density. At present, the active material commonly used in lithium-sulfur battery cathode materials is sulfur element, and its theoretical volume specific energy and mass specific energy are as high as 2800Wh / L and 2600Wh / kg, respectively, much higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M6/14
CPCH01M4/362H01M4/38H01M4/583H01M4/625H01M6/14
Inventor 张永光杜坚忠李朋生彭福生
Owner 深圳市高能达电池有限公司
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