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A kind of preparation method and application of selenium carbon electrode material with porous structure
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An electrode material and porous structure technology, applied in the field of electrochemistry, can solve problems such as being unsuitable for large-scale production, and achieve the effects of good electrochemical performance, good rate, and low cost
Inactive Publication Date: 2016-11-02
SOUTHEAST UNIV
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Problems solved by technology
Patents (such as CN102623678A, CN103178246A, CN103187559A) often use chemical vapor deposition or high temperature perfusion to realize the composite of selenium material and conductive substrate. Although the result is excellent, it is not suitable for mass production
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Embodiment 1
[0030] The synthetic method of porous selenium carbon electrode material:
[0031] (1) Selenium-carbon compound: mix graphene, elemental selenium and nano-calcium carbonate, add ball milling tank for 36 hours, and the rotating speed of the ball-milling tank is 5000rpm; wherein, the mass ratio of graphene and elemental selenium is 1:50, and nano-calcium carbonate The mass ratio with elemental selenium is 1:1;
[0032] (2) The product of step (1) is heat-treated at 250°C for 20h under an inert gas atmosphere; cooled and ground for 2h; then treated in 50% concentrated hydrochloric acid for 12h to remove nano-calcium carbonate;
[0033] (3) After the product of step (2) is washed and dried, it is heat-treated at 250° C. for 3 hours under an argon atmosphere to obtain the final product.
Embodiment 2
[0035] The synthetic method of porous selenium carbon electrode material:
[0036] (1) Selenium-carbon composite: mix graphene, elemental selenium and nano-calcium carbonate, add it into a ball milling tank for ball milling for 4 hours, and the rotating speed of the ball-milling tank is 30000rpm; wherein, the mass ratio of carbon source and elemental selenium is 1:100, and nano-calcium carbonate The mass ratio with elemental selenium is 1:10;
[0037] (2) The product of step (1) is heat-treated at 100° C. for 32 h under an inert gas atmosphere; cooled and ground for 1 h; then treated in 50% concentrated hydrochloric acid for 2 h to remove nano-calcium carbonate;
[0038] (3) After the product of step (2) is washed and dried, it is heat-treated at 100° C. for 5 hours under a nitrogen atmosphere to obtain the product.
Embodiment 3
[0040] The synthetic method of porous selenium carbon electrode material:
[0041] (1) Selenium-carbon composite: mix carbon nanotubes, elemental selenium and nano-calcium carbonate, and add them to a ball milling tank for ball milling for 78 hours. The mass ratio of calcium and elemental selenium is 10:1;
[0042] (2) The product of step (1) is heat-treated at 500°C for 4h under an inert gas atmosphere; cooled and ground for 4h; then treated in 50% concentrated hydrochloric acid for 24h to remove nano-calcium carbonate;
[0043] (3) After the product of step (2) is washed and dried, it is then heat-treated at 500° C. for 2 hours under a carbon monoxide atmosphere to obtain the product.
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Abstract
The invention provides a preparation method of a selenium-carbon electrode material with a porous structure. The preparation method of the selenium-carbon electrode material with the porous structure comprises the following steps: mixing a carbon source, elemental selenium and nano calcium carbonate, adding a mixture into a ball milling tank and carrying out ball milling for 4-78 hours; carrying out heat treatment on the product under an inert atmosphere; cooling and milling; then treating the product in concentrated hydrochloric acid so as to remove nano calcium carbonate; and washing and drying the product, and carrying out heat treatment on the product at 100-500 DEG C under the inert atmosphere to obtain the selenium-carbon electrode material with the porous structure. The preparation method of the selenium-carbon electrode material with the porous structure is simple in process, simple and convenient to operate and low in cost; the prepared selenium-carbon electrode material with the porous structure has good electrochemical performance and excellent rate capability, is safe and reliable, and has a potential of becoming a novel lithium-selenium secondary battery positive electrode.
Description
technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a selenium carbon electrode material with a porous structure, and also relates to the application of the electrode material in preparing a lithium ion secondary battery. Background technique [0002] Lithium-sulfur and lithium-selenium batteries are two types of lithium-ion secondary battery systems with high energy density that are currently being jointly developed by academia and industry. They are the representative and direction of secondary batteries with high energy density performance. Compared with other batteries, lithium-sulfur batteries have high energy density (the theoretical volume specific capacity of elemental sulfur is 3467mA h / cm 3 ), rich in sulfur resources, friendly to the environment, and cheap in price; lithium-selenium batteries have similar volumetric capacities to lithium-sulfur batteries (3253mAh / cm 3 ), and the condu...
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Application Information
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