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Modified diaphragm for lithium-sulfur battery and preparation process of modified diaphragm

A technology of lithium-sulfur battery and preparation process, which is applied in the direction of lithium storage battery, battery pack parts, non-aqueous electrolyte storage battery, etc. It can solve the problems of active material loss, discharge capacity attenuation, failure to meet high specific capacity and high energy density, etc. Achieve the effects of improving Coulombic efficiency and cycle life, improving mechanical stability, and inhibiting the shuttle effect

Pending Publication Date: 2021-07-09
泰州衡川新能源材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous miniaturization of electronic equipment and the rapid development of mobile communication equipment, portable electronic information products, electric vehicles, and energy storage power stations, traditional transition metal oxides such as lithium cobalt oxide (LiCoO2), lithium manganate (LiMn2 O4) and Lithium-ion batteries with lithium nickelate (LiNiO2) as the positive electrode material can no longer meet the needs of overall development, especially the requirements of high specific capacity and high energy density. Therefore, it is imminent to develop high-capacity lithium batteries that meet the development needs of the information age. The theoretical specific capacity of sulfur batteries is nearly ten times that of current commercial lithium-ion batteries, and the reserves of sulfur are very rich, and its supply chain is also very safe and stable.
In the prior art, since the lithium-sulfur battery uses metal lithium as the negative electrode and sulfur or sulfur composite material as the positive electrode, during the charge and discharge process, the elemental sulfur is reduced to long-chain polysulfide Li2 Sx (4<x<8), Dissolved in the electrolyte, migration will occur, resulting in a shuttle effect, and then the elemental sulfur will continue to be reduced to short-chain polysulfides, and finally generate insulating and insoluble Li2S2 / Li2S, and the insoluble Li2S2 / Li2S is deposited on the metal lithium battery. The surface of the electrode directly leads to the loss of active materials, which seriously affects the coulombic efficiency and cycle life of the battery. Finally, the dendrite lithium produced by uneven dissolution and deposition and the volume expansion during the formation of lithium sulfide will lead to a rapid decay of the discharge capacity. Traditional The separators are mainly made of polypropylene PP, polyethylene PE or their composite materials PP / PE / PP. Although these membranes are low in cost and high in flexibility, they have poor lyophilicity, low ionic conductivity and cannot inhibit multiple Sulfide dissolves and diffuses in the electrolyte

Method used

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  • Modified diaphragm for lithium-sulfur battery and preparation process of modified diaphragm
  • Modified diaphragm for lithium-sulfur battery and preparation process of modified diaphragm
  • Modified diaphragm for lithium-sulfur battery and preparation process of modified diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve cobalt nitrate and dimethylimidazole in deionized water, the molar ratio of cobalt nitrate and dimethylimidazole is 1:1, place it at a temperature of 30°C for reaction, and the reaction time is 5h. After the reaction is completed, Form a precursor, add a binder, the binder is styrene-butadiene rubber, and prepare a precursor slurry;

[0031] (2) Take the precursor slurry and apply it on the surface of the base film, and place it at 60°C for drying for 0.5 hours to form a precursor coating and obtain a separator A;

[0032] (3) Take diaphragm A, place it in an atomic deposition instrument, and use 0.01mol / L aluminum chloride and deionized water as reaction sources to deposit on the surface of the precursor coating to form a nano-metal oxide layer, in which the nano-metal Oxide is Al 2 o 3 , deposition process parameters: the reaction temperature is 40°C, the atomic layer deposition cycle is 20 weeks, and the membrane B is obtained;

[0033] (4) Take the d...

Embodiment 2

[0035] (1) Dissolve cobalt nitrate and dimethylimidazole in deionized water, the molar ratio of cobalt nitrate and dimethylimidazole is 1:1, and react at a temperature of 55°C. The reaction time is 8.5h, and the reaction is completed , form a precursor, add a binder, the binder is polyacrylic acid, and prepare a precursor slurry;

[0036] (2) Take the precursor slurry and apply it on the surface of the base film, and dry it at 70°C for 1 hour to form a precursor coating and obtain a separator A;

[0037] (3) Take diaphragm A, place it in an atomic deposition instrument, and use 0.01mol / L ruthenium chloride and deionized water as reaction sources to deposit on the surface of the precursor coating to form a nano-metal oxide layer, wherein the nano-metal Oxide is RuO 2 , deposition process parameters: the reaction temperature is 60°C, the atomic layer deposition cycle is 35 weeks, and the diaphragm B is obtained;

[0038] (4) Take the diaphragm B, place it in a carbon disulfide...

Embodiment 3

[0040] (1) Dissolve cobalt nitrate and dimethylimidazole in deionized water, the molar ratio of cobalt nitrate and dimethylimidazole is 1:1, place it at a temperature of 80°C for reaction, and the reaction time is 12h. After the reaction is completed, Form a precursor, add a binder, the binder is polyvinylidene fluoride, and prepare a precursor slurry;

[0041] (2) Take the precursor slurry and apply it on the surface of the base film, and place it at 80°C for drying for 1 hour to form a precursor coating and obtain a separator A;

[0042](3) Take diaphragm A, place it in an atomic deposition instrument, and use 0.01mol / L manganese chloride and deionized water as reaction sources to deposit on the surface of the precursor coating to form a nano-metal oxide layer, wherein the nano-metal The oxide is MnO, the deposition process parameters: the reaction temperature is 80°C, the atomic layer deposition cycle is 50 weeks, and the diaphragm B is obtained;

[0043] (4) Take the diap...

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Abstract

The invention discloses a modified diaphragm for a lithium-sulfur battery and a preparation process of the modified diaphragm. The modified diaphragm comprises a base membrane and a composite layer arranged on the surface of the base membrane, wherein the composite layer is doped with nanometer metal oxide and nonacobalt octasulfide. According to the invention, the composite layer is arranged on the base membrane, the composite layer is prepared from metal sulfide and the metal oxide, and the metal sulfide, namely nonacobalt octasulfide is arranged on the surface of the base membrane in an array mode; due to the fact that the metal sulfide has porosity and polarity and the metal oxide has adsorption and catalysis performance, when the metal sulfide and the metal oxide are compounded, the physical barrier and chemical adsorption effects of the metal sulfide and the catalytic action of the metal oxide are given to full play, so mechanical stability is improved, and the shuttling of polysulfide is effectively prevented; and thus, the prepared composite layer inhibits shuttling effect, the coulombic efficiency of a lithium-sulfur battery is improved, and the cycle life of the lithium-sulfur battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a modified separator for lithium-sulfur batteries and a preparation process thereof. Background technique [0002] With the continuous miniaturization of electronic equipment and the rapid development of mobile communication equipment, portable electronic information products, electric vehicles, and energy storage power stations, traditional transition metal oxides such as lithium cobalt oxide (LiCoO2), lithium manganate (LiMn2 O4) and Lithium-ion batteries with lithium nickelate (LiNiO2) as the positive electrode material can no longer meet the needs of overall development, especially the requirements of high specific capacity and high energy density. Therefore, it is imminent to develop high-capacity lithium batteries that meet the development needs of the information age. The theoretical specific capacity of sulfur batteries is nearly ten times that of current comme...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449H01M50/431H01M10/052
CPCH01M10/052Y02E60/10
Inventor 邓斌姜蔚阳黄乐飞张安朱丽娟
Owner 泰州衡川新能源材料科技有限公司
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