Lithium-sulfur battery positive pole framework material and preparation method thereof, lithium-sulfur battery positive pole material and lithium-sulfur battery

A lithium-sulfur battery and skeleton material technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of volume effect, slow polysulfide reaction kinetics, active material sulfur loss, battery capacity attenuation, etc., and achieve the suppression of shuttling effect, increase conductivity, and increase specific capacity

Active Publication Date: 2019-10-11
NANCHANG UNIV
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  • Abstract
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Problems solved by technology

However, the commercial application of lithium-sulfur batteries still faces many severe challenges, such as the volume effect during the sulfur cycle, the shuttling effect caused by polysulfide dissolution, and the slow kinetics of polysulfide reactions, etc.
During the discharge process of lithium-sulfur batteries with high sulfur loading and long cycle, the slow polysulfide kinetics will make the insoluble Li 2 S 2 and Li 2 S is obviously deposited on the surface of the electrode, resulting in the continuous loss of the active material sulfur, and the serious attenuation of the battery capacity, so that the battery gradually fails.

Method used

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  • Lithium-sulfur battery positive pole framework material and preparation method thereof, lithium-sulfur battery positive pole material and lithium-sulfur battery
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  • Lithium-sulfur battery positive pole framework material and preparation method thereof, lithium-sulfur battery positive pole material and lithium-sulfur battery

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preparation example Construction

[0044] The present invention provides a preparation method of the lithium-sulfur battery cathode framework material described in the above technical solution, comprising the following steps:

[0045] (1) Aluminum nitrate, cobalt nitrate, sulfanilic acid, alkali and water are mixed to obtain a mixed solution;

[0046] (2) The mixed solution obtained in step (1) is subjected to a hydrothermal reaction to obtain a layered double metal hydroxide;

[0047] (3) Calcining the layered double metal hydroxide obtained in step (2) in a protective atmosphere to obtain a carbonized material;

[0048] (4) soaking the carbonized material obtained in step (3) in an acidic solution to obtain a lithium-sulfur battery positive electrode framework material.

[0049] The invention mixes aluminum nitrate, cobalt nitrate, m-aminobenzenesulfonic acid, alkali and water to obtain a mixed solution.

[0050] In the present invention, the molar ratio of the aluminum nitrate, cobalt nitrate and m-aminobe...

Embodiment 1

[0067] (1) 75g aluminum nitrate nonahydrate, 58g cobalt nitrate hexahydrate, 30g ammonium fluoride and 140g hexamethylenetetramine were dissolved in 2L deionized water, named solution A; in addition, 344g m-aminobenzenesulfonic acid was dissolved in 2L of sodium hydroxide solution with a concentration of 1mol / L, named solution B; slowly add solution B to solution A, then transfer the mixed solution into a 5L reaction kettle, and keep it at 100°C for 12h. After cooling to room temperature, the precipitate was fully washed with water and ethanol, and dried at 100°C for 20 hours to obtain a flower-like layered aluminum-cobalt hydroxide named CoAl-LDH.

[0068] (2) Transfer the prepared CoAl-LDH into a tube furnace, feed nitrogen, heat up at a rate of 5°C / min, carbonize at 700°C for 2 hours, and then cool to room temperature to obtain a flower-shaped carbonized material , named c-LDH.

[0069] (3) Soak the prepared c-LDH with 1.5 L of hydrochloric acid with a mass concentration o...

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Abstract

The invention provides a lithium-sulfur battery positive pole framework material and a preparation method thereof, a lithium-sulfur battery positive pole material and a lithium-sulfur battery, and belongs to the field of lithium-sulfur batteries. The lithium-sulfur battery positive pole framework material provided by the invention is a hollow porous carbon material doped with Co and N, the hollowporous carbon material is of a flower-like structure, and the interior of the flower-like structure is a hollow structure, petals of the flower-like structure are carbon nanosheets, Co and N active sits are attached to the pedals, and the pedals are of porous structures. According to the lithium-sulfur battery positive pole framework material provided by the invention, the volume expansion of active substances during charging and discharging processes can be effectively relieved; via the dual active sires of Co-N, the polysulfide is effectively adsorbed, the conversion of the polysulfide to the solid Li2S2/Li2S is accelerated, the shuttle effect of the polysulfide is suppressed from the source, and thus the specific capacity, rate performance and stability of the positive pole material areimproved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery cathode framework material and a preparation method thereof, a lithium-sulfur battery cathode material and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries are considered to be one of the most promising high-energy-density energy storage devices for the next generation because of their theoretical specific capacity and theoretical energy density as high as 1675mAh / g and 2600 Wh / kg, as well as their environmental friendliness and low cost. one. However, the commercial application of lithium-sulfur batteries still faces many severe challenges, such as the volume effect during the sulfur cycle, the shuttling effect caused by polysulfide dissolution, and the slow kinetics of polysulfide reactions. During the discharge process of lithium-sulfur batteries with high sulfur loading and long cycle, the slow polysulfide kinet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 王珺陈世霞韩欣欣邓曙光
Owner NANCHANG UNIV
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