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Method for preparing sulfur/carbon composite cathode material for lithium-sulfur battery on basis of palm fiber

A palm fiber, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of difficult pore size adjustment, poor rate performance, and high cost, and achieve increased sulfur loading, high pore volume, and high pore volume. Larger than surface effect

Inactive Publication Date: 2017-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because sulfur will generate a series of polysulfides during the cycle, and these polysulfides are easily soluble in the electrolyte, resulting in the loss of active materials.
[0005] 2) Poor rate performance
[0010] At present, carbon materials that can meet the above conditions at the same time often have a cumbersome synthesis process, and most of them use expensive templates or toxic reagents, which are expensive and difficult to quantify. Moreover, some existing low-cost synthesis methods are often difficult to control the pore size. In particular, the acquisition of micropores is more difficult

Method used

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  • Method for preparing sulfur/carbon composite cathode material for lithium-sulfur battery on basis of palm fiber
  • Method for preparing sulfur/carbon composite cathode material for lithium-sulfur battery on basis of palm fiber
  • Method for preparing sulfur/carbon composite cathode material for lithium-sulfur battery on basis of palm fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation embodiment of palm fiber base activated carbon (AC):

[0045] 1) Carbon source pretreatment: Palm fibers are washed with a large amount of tap water and secondary water in turn, then dried in an oven at 120°C for 24 hours, and finally shredded to 2-3mm for later use.

[0046] 2) Carbonization: Weigh the above carbon source, in nitrogen atmosphere, 10°C·min -1 Heat up and keep warm at 500°C for 2h.

[0047] 3) Activation: according to m 炭化料 :m KOH = 1:4 ratio weighed and fully ground evenly, then placed in a graphite tank, activated in a vacuum tube furnace, the activation conditions were nitrogen atmosphere, 10 ° C min -1 Heat up and keep warm at 900°C for 1h.

[0048] 4) Washing and drying: the AC prepared above was sequentially washed with 1mol L -1 The HCl solution was washed three times, washed twice with water until pH = 7, and finally dried in an oven at 120°C for 24 hours to obtain activated carbon. The resulting AC has a specific surface ar...

Embodiment 2

[0052] The activation temperature in Example 1 was changed to 1000° C., and other conditions remained unchanged. The resulting AC specific surface area is 1702 cm 2 / g, the pore volume is 0.92cm 3 / g. See [Table 2] for specific parameters.

[0053] The structural parameters of the activated carbon obtained in table 2 embodiment 2

[0054]

Embodiment 3

[0056] The activation temperature in Example 1 was changed to 800° C., and other conditions remained unchanged. The obtained AC specific surface area is 1247cm 2 / g, the pore volume is 0.66cm 3 / g. See [Table 3] for specific parameters.

[0057] The structural parameters of the activated carbon obtained in table 3 embodiment 3

[0058]

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Abstract

The invention discloses a method for preparing a sulfur / carbon composite cathode material for a lithium-sulfur battery on the basis of a palm fiber. The method comprises the following steps: carbonizing the palm fiber, mixing the palm fiber and potassium hydroxide, performing high-temperature activation to obtain activated carbon, and compounding the activated carbon and elemental sulfur to obtain the sulfur / carbon composite cathode material. The activated carbon in the composite cathode material has the characteristics of large specific surface area and pore volume and rich micropore content, is of a special heteroatom doped and multiwalled porous tubular array structure, and is compounded with sulfur to achieve the sulfur carrying capacity of 65 percent or more, high electrical conductivity and convenience for electron migration and simultaneously relieve the damage of the volume change of the active substance sulfur in an electrochemical process to an electrode structure; when the composite cathode material is used for the lithium-sulfur battery, the lithium-sulfur battery has the advantages of high specific capacity and high cycling stability.

Description

technical field [0001] The invention relates to a lithium-sulfur positive electrode material, in particular to a method for preparing activated carbon with high specific surface area, high pore volume, and rich micropores by using palm fiber, and then compounding with sulfur to prepare positive electrode materials for lithium-sulfur batteries, which belongs to lithium-sulfur The field of battery technology. Background technique [0002] With the continuous consumption of fossil energy by human beings, the energy crisis and environmental pollution continue to aggravate. The production of chemical power sources not only brings great convenience to people's production and life, but also reduces energy crisis and environmental pollution. With the successful commercialization of lithium-ion batteries, various mobile electronic devices and vehicles powered by electric energy have also developed rapidly. Large-scale electric equipment such as electric vehicles and drones have hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 李亚娟游小龙张枝枫张梦源马路刘又年
Owner CENT SOUTH UNIV
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