Lithium-sulfur battery negative electrode and lithium-sulfur battery comprising same

A lithium-sulfur battery and negative electrode technology, applied in the field of chemical power sources, can solve the problems of loss of active material and limited effect, and achieve the effects of improving sulfur utilization rate, improving cycle performance and service life, and suppressing shuttle effect.

Active Publication Date: 2020-08-14
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, such as alumina, silica inorganic protective layer, conductive polymer organic protective layer or organic / inorganic composite protective layer have achieved certain effects, but these protective layers only have the function of physical isolation, and most of the shuttles to the negative electrode side Sulfides will still be reduced to Li 2 S 2 or Li 2 S precipitates on the negative electrode, causing the loss of active materials, so it has limited effect on solving the problems existing in lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery negative electrode and lithium-sulfur battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 6g of trichlorosilane, 15g of methanol and 20g of solvent benzene into the stirred reactor, heat and dissolve under stirring for reaction. After the reaction, heat distillation is carried out, the solvent is distilled off and recovered for recycling, and the remaining product is cooled to obtain trimethoxysilane. In a 250ml four-necked bottle, take 15g of trimethoxysilane, 15g of 1,1,2-trifluoro-1-butene and 1g of initiator, under the protection of dry nitrogen, keep stirring, and heat up to 40°C , kept for 2h, and then cooled to room temperature to obtain the addition reactant. In a 2L three-necked flask equipped with a condenser, a stirrer and a thermometer, add 20 g of the obtained addition reactant and 10 g of thiourea for reaction, reflux at 110 °C for 10 h, and when cooled to 60 °C, feed ammonia gas, when When the reaction is no longer exothermic, the ammonia gas is stopped. Then filter, distill the filtrate under reduced pressure, and take the 85°C / 0.80kPa ...

Embodiment 2

[0022] Add 4.5g of trichlorosilane, 10g of methanol and 15g of solvent benzene into the stirred reactor, heat and dissolve under stirring for reaction. After the reaction, heat distillation is carried out, the solvent is distilled off and recovered for recycling, and the remaining product is cooled to obtain trimethoxysilane. In a 250ml four-neck bottle, take 12.5g trimethoxysilane, 12.5g 1,1,2-trifluoro-1-butene and 0.75g initiator, under the protection of dry nitrogen, keep stirring, and heat up Heat at 40°C for 2 hours, then cool to room temperature to obtain the addition reactant. In a 2L three-necked flask equipped with a condenser, a stirrer and a thermometer, add 17.5 g of the obtained addition reactant and 8 g of thiourea to react, reflux at 105 ° C for 9 h, and when cooled to 60 ° C, feed ammonia gas, When the reaction is no longer exothermic, the ammonia gas is stopped. Then filter, distill the filtrate under reduced pressure, and take the 83.5°C / 0.75kPa fraction. ...

Embodiment 3

[0026] Add 3g of trichlorosilane, 5g of methanol and 10g of solvent benzene into the stirring reaction kettle, heat and dissolve under stirring for reaction. After the reaction, heat distillation is carried out, the solvent is distilled off and recovered for recycling, and the remaining product is cooled to obtain trimethoxysilane. In a 250 ml four-neck bottle, take 10 g of trimethoxysilane, 10 g of 1,1,2-trifluoro-1-butene and 0.5 g of initiator, under the protection of dry nitrogen, keep stirring, and heat up to 30 ℃, keep warm for 1h, and then cool to room temperature to obtain the addition reactant. In a 2L three-necked flask equipped with a condenser, a stirrer and a thermometer, add 15 g of the obtained addition reactant and 6 g of thiourea for reaction, reflux at 100 ° C for 8 h, and when cooled to 60 ° C, feed ammonia gas. When the reaction is no longer exothermic, the ammonia gas is stopped. Then filter, distill the filtrate under reduced pressure, and take the 82°C...

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Abstract

The invention provides a lithium-sulfur battery negative electrode. A protective layer is arranged on the surface of a negative electrode containing metal lithium, and the protective layer comprises alithium affinity unit, a reducibility unit and an electronegativity unit. The invention also provides a lithium-sulfur battery comprising the negative electrode. According to the invention, the protective layer is arranged on the surface of the negative electrode containing the metal lithium, and the lithium affinity unit contained in the protective layer firmly adsorbs the protective layer to the surface of the negative electrode so as to isolate direct contact between polysulfide ions and the metal lithium; the reducibility unit can shear long-chain polysulfide ions reaching the negative electrode side through the electrolyte through the diaphragm into short-chain polysulfide ions, and then the electronegativity unit reacts with the short-chain polysulfide ions to enable the short-chainpolysulfide ions to continue to return to a positive electrode side, so that more irreversible Li2S is prevented from being formed on the negative electrode side. The lithium affinity unit, the reducibility unit and the electronegativity unit in the protective layer have a synergistic effect, so that the shuttle effect is effectively inhibited, and the sulfur utilization rate is increased. And the cycle performance and the service life of the battery are improved.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to a lithium-sulfur battery negative electrode and a lithium-sulfur battery containing it. Background technique [0002] At present, in view of the "shuttle effect" problem existing in lithium-sulfur batteries, lithium metal is usually covered with a protective layer to physically isolate it from the electrolyte to prevent the intermediate product Li 2 S 8 , Li 2 S 6 and other polysulfides are deposited and further reacted on the lithium metal anode. At present, such as alumina, silica inorganic protective layer, conductive polymer organic protective layer or organic / inorganic composite protective layer have achieved certain effects, but these protective layers only have the function of physical isolation, and most of the shuttles to the negative electrode side Sulfides will still be reduced to Li 2 S 2 or Li 2 S precipitates on the negative electrode, causin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/052H01M10/42
CPCH01M4/628H01M4/134H01M10/052H01M10/4235Y02E60/10
Inventor 牛从酥彭祖铃刘可禄王淑慧闫银贤
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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