A kind of interlayer for all-solid-state lithium-sulfur battery and all-solid-state lithium-sulfur battery

Abstract

The invention discloses an interlayer for an all-solid-state lithium-sulfur battery and an all-solid-state lithium-sulfur battery. The interlayer is composed of a solid electrolyte and a conductive material. The all-solid-state lithium-sulfur battery includes a sulfur positive electrode, a solid electrolyte membrane, and a metal lithium negative electrode. The interlayer is arranged between the solid electrolyte membrane and the solid electrolyte membrane; the interlayer has both conductivity and lithium conductivity, and it is arranged between the positive electrode of the all-solid-state lithium-sulfur battery and the solid electrolyte, which can fully react the active material sulfur and increase the active material sulfur. At the same time, the interlayer can inhibit the shuttle of polysulfides, improve the coulombic efficiency and cycle life of the lithium-sulfur battery, and thus obtain an all-solid-state lithium-sulfur battery with high capacity, stable cycle performance and high safety performance.

Description

technical field

[0001] The invention relates to an interlayer for an all-solid-state lithium-sulfur battery and an all-solid-state lithium-sulfur battery, belonging to the technical field of lithium-sulfur solid batteries. Background technique

[0002] With the gradual emergence of energy and environmental issues, the development of new energy has become one of the mainstream directions of current research. Among them, lithium-ion batteries have been widely used in many fields such as portable digital devices, electric vehicles, and military defense since their appearance. With the progress of society, the market has put forward higher and higher requirements for the performance of batteries, especially for its safety performance and energy density. However, the specific capacity of the positive electrode material of traditional lithium-ion batteries is low. It is the biggest factor limiting its energy density, so it is urgent to develop a new generation of high-energy and ...

Examples

Embodiment 1

[0031] An interlayer whose composition is PEO+MIL-53(Al)+LiTFSI+super P is prepared, wherein the mass percentage of super P is 7wt%.

[0032] According to the technical requirements, the metal-organic framework MIL-53(Al) was first synthesized. Weigh 1.7g of aluminum nitrate nonahydrate and 0.5g of terephthalic acid, add them to 25mL of DMF (N,N-dimethylformamide), then add 5mL of deionized water, and place the reaction kettle in an oil bath at 160°C In the process, react at a constant temperature at 400rpm for 72h, then wash with deionized water for 3 times to remove DMF, filter after washing, and dry the obtained product in a vacuum oven at 120°C for 24h to obtain MIL-53 (Al) white powder.

[0033] Film formation: Dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI and 1g of PEO in 16mL of acetonitrile, stir at room temperature for 24h, evaporate the solvent at room temperature for 12h, and then dry at 80°C for 12h to obtain a thickness of 20μm polymer solid electro...

Embodiment 2

[0036] The same solid electrolyte membrane and interlayer as in Example 1 were prepared and assembled into an all-solid-state lithium-sulfur battery. The 0.1C cycle test was performed at 60°C, and the first discharge specific capacity was 1207.5mAh g -1 , there is still 912.3mAh g after 30 laps -1 capacity play.

Embodiment 3

[0038] An interlayer whose composition is PEO+MIL-53(Al)+LiTFSI+multi-walled carbon nanotubes is prepared, wherein the mass percentage of the multi-walled carbon nanotubes is 30wt%.

[0039] Film formation: prepare the same MIL-53(Al) white powder as in Example 1, dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI and 1g of PEO in 16mL of acetonitrile, stir at room temperature for 24h, at room temperature The solvent was evaporated for 12 hours, and then dried at 80° C. for 12 hours to obtain a polymer solid electrolyte membrane with a thickness of 20 μm. Dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI, 0.56g of multi-walled carbon nanotubes and 1g of PEO in 25mL of acetonitrile, stir at room temperature for 24h, evaporate the solvent at room temperature for 12h, and then dry at 80°C for 12h , to obtain an interlayer with a thickness of 8.5 μm.

[0040] The prepared solid electrolyte membrane and interlayer are assembled into an all-solid-state lithium-sulf...

technical field

[0001] The invention relates to an interlayer for an all-solid-state lithium-sulfur battery and an all-solid-state lithium-sulfur battery, belonging to the technical field of lithium-sulfur solid batteries. Background technique

[0002] With the gradual emergence of energy and environmental issues, the development of new energy has become one of the mainstream directions of current research. Among them, lithium-ion batteries have been widely used in many fields such as portable digital devices, electric vehicles, and military defense since their appearance. With the progress of society, the market has put forward higher and higher requirements for the performance of batteries, especially for its safety performance and energy density. However, the specific capacity of the positive electrode material of traditional lithium-ion batteries is low. It is the biggest factor limiting its energy density, so it is urgent to develop a new generation of high-energy and ...

Examples

Embodiment 1

[0031] An interlayer whose composition is PEO+MIL-53(Al)+LiTFSI+super P is prepared, wherein the mass percentage of super P is 7wt%.

[0032] According to the technical requirements, the metal-organic framework MIL-53(Al) was first synthesized. Weigh 1.7g of aluminum nitrate nonahydrate and 0.5g of terephthalic acid, add them to 25mL of DMF (N,N-dimethylformamide), then add 5mL of deionized water, and place the reaction kettle in an oil bath at 160°C In the process, react at a constant temperature at 400rpm for 72h, then wash with deionized water for 3 times to remove DMF, filter after washing, and dry the obtained product in a vacuum oven at 120°C for 24h to obtain MIL-53 (Al) white powder.

[0033] Film formation: Dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI and 1g of PEO in 16mL of acetonitrile, stir at room temperature for 24h, evaporate the solvent at room temperature for 12h, and then dry at 80°C for 12h to obtain a thickness of 20μm polymer solid electro...

Embodiment 2

[0036] The same solid electrolyte membrane and interlayer as in Example 1 were prepared and assembled into an all-solid-state lithium-sulfur battery. The 0.1C cycle test was performed at 60°C, and the first discharge specific capacity was 1207.5mAh g -1 , there is still 912.3mAh g after 30 laps -1 capacity play.

Embodiment 3

[0038] An interlayer whose composition is PEO+MIL-53(Al)+LiTFSI+multi-walled carbon nanotubes is prepared, wherein the mass percentage of the multi-walled carbon nanotubes is 30wt%.

[0039] Film formation: prepare the same MIL-53(Al) white powder as in Example 1, dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI and 1g of PEO in 16mL of acetonitrile, stir at room temperature for 24h, at room temperature The solvent was evaporated for 12 hours, and then dried at 80° C. for 12 hours to obtain a polymer solid electrolyte membrane with a thickness of 20 μm. Dissolve 0.1g of the prepared white powder, 0.2g of LiTFSI, 0.56g of multi-walled carbon nanotubes and 1g of PEO in 25mL of acetonitrile, stir at room temperature for 24h, evaporate the solvent at room temperature for 12h, and then dry at 80°C for 12h , to obtain an interlayer with a thickness of 8.5 μm.

[0040] The prepared solid electrolyte membrane and interlayer are assembled into an all-solid-state lithium-sulf...

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