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Nano flower spherical carbon-sulfur composite lithium-sulfur battery positive electrode material supported by nickel foam and preparation method thereof

A technology of carbon-sulfur composite and positive electrode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of surface morphology and microscopic characteristics of sulfur positive electrodes, weakened contact between materials and substrates, and shortened cycle life. Achieve good electron transmission channel, slow down capacity attenuation, increase the effect of contact area

Active Publication Date: 2018-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above shuttle effect not only reduces the active material of the positive electrode, but also causes internal self-discharge of the battery, causing capacity fading and shortening cycle life.
Furthermore, there is a large volume change during the cycle of lithium-sulfur batteries, S 8 (2.07g / cm 3 ) and Li 2 S (1.66g / cm 3 ) density is different, and its volume expansion is about 76%, which leads to the weakening of the contact between the material and the substrate, and the destruction of the surface morphology and microscopic characteristics of the sulfur cathode, resulting in capacity fading

Method used

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  • Nano flower spherical carbon-sulfur composite lithium-sulfur battery positive electrode material supported by nickel foam and preparation method thereof
  • Nano flower spherical carbon-sulfur composite lithium-sulfur battery positive electrode material supported by nickel foam and preparation method thereof
  • Nano flower spherical carbon-sulfur composite lithium-sulfur battery positive electrode material supported by nickel foam and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 0.6g of zinc nitrate hexahydrate, 0.6g of urea and 0.15g of ammonium fluoride, dissolve them in 80ml of deionized water, stir until completely dissolved to a transparent state, and prepare a homogeneous solution. Put the homogeneous solution formed above into a polytetrafluoroethylene high-pressure hydrothermal tank, and put a foamed nickel substrate in advance. The hydrothermal tank was sealed in a high-pressure reactor, and the hydrothermal reaction was carried out in an oven at 90° C. for 6 hours. After the reaction is complete, cool to room temperature 25° C., wash with deionized water three times, and place in an oven to dry. Afterwards, it was calcined at 500° C. for 1 hour in argon, and cooled naturally to room temperature 25° C. to prepare zinc oxide nanosheets supported by nickel foam.

[0037] Put 80ml of glucose aqueous solution with a molar concentration of 0.1mol / L into a polytetrafluoroethylene high-pressure hydrothermal tank, and put zinc oxide nan...

Embodiment 2

[0040] Weigh 1.2g of zinc nitrate hexahydrate, 1.2g of urea and 0.3g of ammonium fluoride, dissolve them in 80ml of deionized water, stir until completely dissolved to a transparent state, and prepare a homogeneous solution. Put the homogeneous solution formed above into a polytetrafluoroethylene high-pressure hydrothermal tank, and put a foamed nickel substrate in advance. The hydrothermal tank was sealed in a high-pressure reactor, and the hydrothermal reaction was carried out in an oven at 130° C. for 7.5 hours. After the reaction is complete, cool to room temperature, wash with deionized water three times, and place in an oven to dry. Afterwards, it was calcined at 650° C. for 2 hours in argon, and cooled naturally to room temperature 25° C. to prepare zinc oxide nanosheets supported by nickel foam.

[0041] Put 80ml of glucose aqueous solution with a molar concentration of 1mol / L into a polytetrafluoroethylene high-pressure hydrothermal tank, and put zinc oxide nanosheet...

Embodiment 3

[0044] Weigh 1.8 g of zinc nitrate hexahydrate, 1.8 g of urea and 0.45 g of ammonium fluoride and dissolve them in 80 ml of deionized water, stir until completely dissolved to a transparent state, and prepare a homogeneous solution. Put the homogeneous solution formed above into a polytetrafluoroethylene high-pressure hydrothermal tank, and put a foamed nickel substrate in advance. The hydrothermal tank was sealed in a high-pressure reactor, and the hydrothermal reaction was carried out in an oven at 150° C. for 9 hours. After the reaction is complete, cool to room temperature, wash with deionized water three times, and place in an oven to dry. Afterwards, it was calcined in argon at 800° C. for 3 hours, and cooled naturally to room temperature of 25° C. to prepare zinc oxide nanosheets supported by nickel foam.

[0045] Put 80ml of glucose aqueous solution with a molar concentration of 2mol / L into a polytetrafluoroethylene high-pressure hydrothermal tank, and put zinc oxide ...

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Abstract

The invention discloses a foam nickel-loaded nanometer flower spherical carbon and sulfur composite lithium-sulfur battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps of generating a zinc oxide nanosheet as a sacrificial template through early hydrothermal reaction; performing hydrothermal charring on glucose at the temperature of 180-240 DEG C, reacting for 3-6 hours, and generating a foam nickel-loaded three-dimensional crosslinking carbon nanosheet and carbon nanosphere composite structure; then, sulfurizing by a melting method, using carbon disulfide as a solvent, and reacting, so as to prepare a target material. The diameter of the nanometer sphere is 100 to 800nm, and the thickness of the nanosheet is 10 to 50nm. The foam nickel-loaded nanometer flower spherical carbon and sulfur composite lithium-sulfur battery positive electrode material has the advantages that the flexible self-support is realized, the discharging capacity is high, the circulating stability is high, and the rate property is high; the mass energy density and rate property of active substances are greatly improved; the material is suitable for high-energy density energy storage devices; the application prospect is broad in the fields of instant communication, aerospace and the like.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium-sulfur batteries, in particular to a nano-flower spherical carbon-sulfur composite lithium-sulfur battery cathode material supported by foamed nickel and a preparation method thereof. Background technique [0002] With the rapid development of social economy and the shortage of resources and energy, green energy has become an important strategic choice for the sustainable development of human society. Electrochemical energy storage materials and devices are the key to solving clean energy conversion, storage and utilization. As a new type of chemical power source developed in the 1990s, lithium-ion secondary batteries have the advantages of high energy density, long cycle life, high discharge voltage, and environmental friendliness. They are widely used in transportation, national defense, aviation, military and other fields. application prospects. However, after more than 20 years o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/052
CPCH01M4/364H01M4/583H01M10/052Y02E60/10
Inventor 夏新辉李书涵涂江平王秀丽
Owner ZHEJIANG UNIV
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