Flexible integrated lithium-sulfur battery positive electrode material and preparation method thereof

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, electrode manufacturing, etc., can solve the problems of low active ingredient loading, poor cycle stability, and poor conductivity, so as to save electrode preparation process and improve electrical conductivity Poor performance and improved insulation effect

Inactive Publication Date: 2021-09-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of existing lithium-sulfur battery cathode materials, such as poor conductivity, low loading of active components, low specific capacity, poor cycle stability, etc., and provides a flexible and integrated lithium-sulfur battery cathode material and a preparation method thereof

Method used

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  • Flexible integrated lithium-sulfur battery positive electrode material and preparation method thereof
  • Flexible integrated lithium-sulfur battery positive electrode material and preparation method thereof
  • Flexible integrated lithium-sulfur battery positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] a: Prepare 100 mL of a mixed solution of 5 mM cobalt nitrate and 25 mM urea, ultrasonically disperse it and transfer it to a reactor, place the nickel foam substrate in the reactor, and then react at a high temperature of 120 ° C for 6 h; obtain in situ grown one-dimensional cobalt hydroxide Nickel foam with nanowire arrays;

[0026] b: The prepared nickel foam for in-situ growth of one-dimensional cobalt hydroxide nanowire arrays is placed in an atmosphere furnace, and 0.1 g of ZIF-67 is added as a carbon source, and continuously roasted at 800 ° C for 2 h under the condition of nitrogen gas, Obtain a three-dimensional sulfur-fixing carrier;

[0027]c: Disperse 50 mg of sulfur powder in 1 mL of carbon disulfide, ultrasonically disperse it, then dropwise add it onto the three-dimensional sulfur-fixed carrier obtained in step b, dry it in an oven at 60°C, and then heat it in an oven at 155°C for 12 hours , and finally a flexible integrated lithium-sulfur battery cathode...

Embodiment 2

[0029] a: Prepare 100mL of a mixed solution of 5mM nickel nitrate and 25mM urea, ultrasonically disperse it and transfer it to a reaction kettle, place the foamed nickel substrate in the reaction kettle, and then react at a high temperature of 120°C for 6h; obtain in-situ growth of one-dimensional nickel hydroxide Nickel foam with nanowire arrays;

[0030] b: Put the prepared nickel foam for in-situ growth of one-dimensional nickel hydroxide nanowire arrays in an atmosphere furnace, add 0.1 g of ZIF-67 as a carbon source, and continuously bake at 800 ° C for 2 h under the condition of nitrogen gas, Obtain a three-dimensional sulfur-fixing carrier;

[0031] c: Disperse 50 mg of sulfur powder in 1 mL of carbon disulfide, ultrasonically disperse it, then dropwise add it onto the three-dimensional sulfur-fixed carrier obtained in step b, dry it in an oven at 60°C, and then heat it in an oven at 155°C for 12 hours , and finally a flexible integrated lithium-sulfur battery cathode ...

Embodiment 3

[0033] a: Prepare 100 mL of a mixed solution of 5 mM titanium nitrate and 25 mM urea, ultrasonically disperse it and transfer it to a reactor, place the nickel foam substrate in the reactor, and then react at a high temperature of 120 °C for 6 h; obtain in-situ grown one-dimensional titanium hydroxide Nickel foam with nanowire arrays;

[0034] b: Put the prepared nickel foam for in-situ growth of one-dimensional titanium hydroxide nanowire arrays in an atmosphere furnace, add 0.1 g of ZIF-67 as a carbon source, and continuously bake at 800 ° C for 2 h under the condition of nitrogen gas, Obtain a three-dimensional sulfur-fixing carrier;

[0035] c: Disperse 50 mg of sulfur powder in 1 mL of carbon disulfide, ultrasonically disperse it, then dropwise add it onto the three-dimensional sulfur-fixed carrier obtained in step b, dry it in an oven at 60°C, and then heat it in an oven at 155°C for 12 hours , and finally a flexible integrated lithium-sulfur battery cathode is obtained...

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Abstract

The invention discloses a flexible integrated lithium-sulfur battery positive electrode material and a preparation method thereof. According to the method, on a flexible substrate, an ordered oxide hydroxide one-dimensional nanowire array is constructed in situ through hydro-thermal synthesis, then organic matter is subjected to high-temperature pyrolysis in an oxygen-free atmosphere, gas-phase chemical deposition of heteroatom-doped carbon nanotubes on the surfaces of nanowires is achieved, and meanwhile, corresponding oxides and hydroxides are converted into corresponding metal or derivatives thereof, so that a metal or derivative thereof / heteroatom doped carbon nanotube three-dimensional sulfur fixation carrier is obtained. The integrated electrode disclosed by the invention has relatively high interface stability, the contact internal resistance of a battery is remarkably reduced, the sulfur loading capacity of the sulfur positive electrode is 3-20mg cm<-2>, the cycling stability of the lithium-sulfur battery is effectively improved, and the overall energy density of the battery is improved. The integrated electrode can also effectively improve the insulativity of sulfur in the lithium-sulfur battery and the shuttle effect of an intermediate product, and can be widely applied to wearable lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterial synthesis, and in particular relates to a flexible integrated lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology in recent years, energy supply has become the biggest obstacle restricting its development. At this stage, lithium-ion batteries still occupy the vast majority of the energy storage market, but due to the limited energy density (350Wh kg –1 ), it has been difficult to meet large-scale, high-power electricity demand. Therefore, the development of new battery systems with high energy density and high power density has become the focus and hot spot of people's research. [0003] Among the new battery systems, lithium metal batteries have attracted extensive research interest due to their ultra-high energy density. Among them, the theoretical energy density of lithium-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/62H01M10/052
CPCH01M4/0404H01M4/625H01M10/052Y02E60/10
Inventor 邵明飞李剑波谢文富
Owner BEIJING UNIV OF CHEM TECH
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