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A kind of preparation method and application of high specific capacity sulfur-containing cathode material

A positive electrode material, high specific capacity technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of powdering and falling off of electroactive materials, capacity attenuation, dissolution loss, etc., to increase the overall specific capacity and overcome capacity loss , the effect of easy access to raw materials

Active Publication Date: 2017-10-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite positive electrode material formed by porous carbon loaded with sulfur is accompanied by serious volume expansion and contraction during the intercalation and delithiation process, and the intermediate product lithium polysulfide is easily soluble in the electrolyte solution, resulting in the powdering and falling off of the electroactive material on the electrode. and dissolution loss, and the lithium polysulfide dissolved in the electrolyte diffuses to the lithium metal negative electrode and reacts to form lithium sulfide to precipitate on the surface of the negative electrode, resulting in an increase in internal resistance and eventually leading to capacity fading

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  • A kind of preparation method and application of high specific capacity sulfur-containing cathode material

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Embodiment 1

[0023] A method for preparing a high specific capacity sulfur-containing cathode material, comprising the following steps:

[0024] (1) Synthesis of trapezoidal polymer nanoribbons

[0025] Dissolve 1.10 grams of hydroquinone in 100 mL of water, add 10 grams of concentrated hydrochloric acid, stir well, add 2.0 grams of 37wt% formaldehyde, stir well, transfer to a polytetrafluoroethylene reactor, react at 200 ° C for 12 hours, and cool naturally Then filter, wash with ethanol, and dry to obtain a brown-black spongy powder.

[0026] (2), vulcanization of polymer nanoribbons

[0027] Weigh 0.5 g of polymer nanobelts and 0.5 g of sublimed sulfur powder, mix them in a mortar, transfer them into a boron glass test tube, vacuum seal the tube, heat to 500°C and keep it warm for 0.5 hours, after natural cooling, open the glass tube tube to remove the sample. .

[0028] Electrochemical performance test

[0029] The sulfur-containing positive electrode material obtained in step (2)...

Embodiment 2

[0032] A method for preparing a high specific capacity sulfur-containing cathode material, comprising the following steps:

[0033] (1) Synthesis of trapezoidal polymer nanoribbons

[0034] Dissolve 1.10 grams of hydroquinone in 100 mL of water, add 10 grams of concentrated hydrochloric acid, stir well, add 2.0 grams of 37wt% formaldehyde, stir well, transfer to a polytetrafluoroethylene reactor, react at 180 ° C for 12 hours, and cool naturally Then filter, wash with ethanol, and dry to obtain a brown-black spongy powder.

[0035] (2), vulcanization of polymer nanoribbons

[0036] Weigh 0.5 g of polymer nanobelts and 4.5 g of sublimed sulfur powder, mix them in a mortar, transfer them into a boron glass test tube, vacuum seal the tube, heat to 350°C and keep it warm for 1 hour, after natural cooling, open the glass tube tube to remove the sample. .

[0037] Electrochemical performance test

[0038] The sulfur-containing positive electrode material obtained in step 2 was ...

Embodiment 3

[0041] A method for preparing a high specific capacity sulfur-containing cathode material, comprising the following steps:

[0042] (1) Synthesis of trapezoidal polymer nanoribbons

[0043] Dissolve 1.10 grams of hydroquinone in 100 mL of water, add 10 grams of concentrated hydrochloric acid, stir well, add 2.0 grams of 37wt% formaldehyde, stir well, transfer to a polytetrafluoroethylene reactor, react at 170 ° C for 12 hours, and cool naturally Then filter, wash with ethanol, and dry to obtain a brown-black spongy powder.

[0044] (2), vulcanization of polymer nanoribbons

[0045] Weigh 0.5 g of polymer nanobelts and 1.5 g of sublimed sulfur powder, mix them in a mortar, transfer them into a boron glass test tube, vacuum seal the tube, heat to 200°C and keep it warm for 12 hours, after natural cooling, open the glass tube tube to remove the sample. .

[0046] Electrochemical performance test

[0047] The sulfur-containing positive electrode material obtained in step 2 wa...

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Abstract

The present invention provides a preparation method and applications of a high specific capacity sulfur-containing positive electrode material. According to the present invention, the phenolic hydroxyl group-rich trapezoidal macromolecule polymer is adopted and reacts with elemental sulfur at a certain temperature, wherein the phenolic hydroxyl group is oxidized into the quinonyl, the sulfur is bonded onto the polymer main chain, and the quinonyl further provides the partial Intercalation / deintercalation lithium capacity, such that the whole specific capacity of the material is effectively increased, and the first discharge specific capacity of the obtained product achieves 1578 mAh / g; the sulfur is firmly bonded onto the polymer main chain through the chemical bond, such that the capacity loss caused by dissolution of the sulfur can be effectively overcome; compared with the method in the prior art, the method of the present invention has characteristics of simple process, easily available raw materials, and mass-production prospects.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to a preparation method and application of a high specific capacity sulfur-containing cathode material. Background technique [0002] At present, the 3C products of mobile phones and notebook computers are mainly powered by lithium-ion batteries. The theoretical specific energy of lithium-ion batteries is 400-600Wh / kg. Lithium-ion batteries need some necessary auxiliary materials: such as current collectors, diaphragms, electrolytes and packaging. Therefore, the specific energy of lithium-ion batteries actually produced is much lower than the theoretical specific energy, generally between 90 and 200Wh / kg. With the development of high-power consumption products such as smart phones and electric vehicles, it is difficult for existing lithium-ion batteries to fully meet the demanding requirements of these products. [0003] In the past ten years, various new t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/364H01M4/602Y02E60/10
Inventor 曾绍忠王秀田赵志刚
Owner CHERY AUTOMOBILE CO LTD