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Micro-nanostructured lithium-sulfur battery composite cathode material, preparation method thereof and battery

A composite positive electrode material and battery technology, applied in battery electrodes, lithium batteries, nanotechnology for materials and surface science, etc., can solve the problems of polysulfide shuttle effect, slow conversion rate, low conductivity, etc., to achieve inhibition Shuttle effect, increase conversion rate, increase the effect of conductivity

Pending Publication Date: 2019-09-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a battery composite positive electrode material and its preparation method and battery, which are used to solve the problems of low electrical conductivity, slow conversion rate, and polysulfide shuttle effect in existing lithium-sulfur battery positive electrode materials.

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  • Micro-nanostructured lithium-sulfur battery composite cathode material, preparation method thereof and battery
  • Micro-nanostructured lithium-sulfur battery composite cathode material, preparation method thereof and battery
  • Micro-nanostructured lithium-sulfur battery composite cathode material, preparation method thereof and battery

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preparation example Construction

[0059] The present invention also provides a preparation method of battery composite cathode material, comprising the following steps:

[0060] a) Depositing titanium dioxide 2 on the surface of the microsphere 4 to obtain a composite microsphere 6 with titanium dioxide 2 deposited on the surface;

[0061] b) Coating the polymer 5 on the surface of the composite microsphere 6 to obtain the composite microsphere 6 coated with the polymer 5, and then carbonizing the composite microsphere 6 coated with the polymer 5 under a mixed atmosphere to carbonize the polymer 5 , to obtain heteroatom-doped carbon-coated composite microspheres 8;

[0062] c) Etching the heteroatom-doped carbon-coated composite microspheres 8 to remove the microspheres to obtain a metal-carbon shell 9, and then load elemental sulfur in the metal-carbon shell 9, and the elemental sulfur is deposited on the metal-carbon shell Sulfur nucleus 1 is formed in 9 to obtain battery composite positive electrode materi...

Embodiment 1

[0095] This embodiment carries out the preparation of battery composite positive electrode material, comprises the following steps:

[0096] 1) Measure 20mL of deionized water, 70mL of absolute ethanol and 5mL of 30wt% ammonia water respectively, add them to the beaker in sequence, stir evenly with a magnetic stirrer at room temperature, weigh 1.0g of tetraethyl orthosilicate (TEOS) and slowly add it dropwise to In the uniformly mixed solution, seal the mouth of the beaker with a polyethylene film after the dropwise addition, and stir continuously at room temperature for 6 hours to complete the reaction, and then centrifugally wash to obtain SiO with different diameters. 2 Microspheres, SiO 2 The diameter of the microsphere is 100nm-300nm.

[0097] 2) Weighing 0.5 g of tetrabutyl titanate was added into deionized water, and stirred at room temperature to form a tetrabutyl titanate solution. Weigh another 0.2g SiO 2 The microspheres were dissolved in deionized water to obtai...

Embodiment 2

[0101] This embodiment carries out the preparation of battery composite positive electrode material, comprises the following steps:

[0102] 1) Weigh 1.3g of polyacrylic acid and dissolve it in deionized water, add 1.0g of the composite microspheres prepared in Example 1, continue to stir at room temperature for 10h, centrifugally clean, and dry to obtain polymer-coated composite microspheres; The coated composite microspheres are placed in a tube furnace, and thiourea is placed on the upper tuyeres of the tube furnace, and the thiourea is decomposed by argon gas heated at a flow rate of 35mL / min. At this time, the tube furnace is filled with argon In a mixed atmosphere with hydrogen sulfide, heat up to 650°C at a heating rate of 3°C / min for 2.5h constant temperature carbonization treatment to carbonize polyacrylic acid to obtain composite microspheres coated with sulfur-doped carbon, with a sulfur-doped carbon content of 27%. , the pore diameter of the mesopores on the surfac...

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Abstract

The invention belongs to the technical field of lithium-sulfur battery cathode materials and in particular to a micro-nanostructured lithium-sulfur battery composite cathode material, a preparation method thereof and a battery. The invention provides a battery composite cathode material which has a core-shell structure. The core-shell structure comprises a metal-carbon shell and a sulfur core disposed in the metal-carbon shell. The metal-carbon shell is formed by doping titanium dioxide with heteroatom. The titanium dioxide coats the interior of the heteroatom-doped carbon. The sulfur core is formed by elemental sulfur. The battery composite cathode material of the invention has the core-shell structure. The metal-carbon shell can improve the electrical conductivity of the battery composite cathode material and can have a confinement effect on the sulfur and the intermediate product polysulfide. The titanium dioxide in the metal-carbon shell can not only adsorb the polysulfide through pro-lithium or thiophilic effect, inhibits the shuttle effect, provides a sulfur deposition site, but also can catalyze the conversion of sulfur and polysulfide, improve the kinetics of electrode process, and increase an electrode conversion rate.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium-sulfur batteries, and in particular relates to a composite cathode material for lithium-sulfur batteries with a micro-nano structure, a preparation method thereof, and a battery. Background technique [0002] Energy storage technology is one of the key technologies for human beings to solve energy and environmental problems in the new century. After decades of development, the performance of traditional lithium-ion batteries has reached the theoretical limit, so it is particularly important to find the next generation of secondary lithium-ion batteries with high energy density. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Whkg -1 ), which is 3-5 times that of traditional lithium-ion batteries, and has abundant elemental sulfur reserves, environmental friendliness, and low cost, so it is expected to become a new g...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052B82Y30/00H01M2004/021H01M2004/028Y02E60/10
Inventor 刘全兵李栋谢盈基南皓雄郑育英党岱
Owner GUANGDONG UNIV OF TECH
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