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Sulfur-based composite material coated with carbon, preparation and application thereof

A carbon coating and carbon material technology, applied in the field of secondary aluminum battery and its preparation, can solve the problems of easy dissolution of reactants in electrolyte and poor electrical conductivity, and achieve improved electrical conductivity, long service life and high specific capacity. Effect

Inactive Publication Date: 2015-01-21
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the poor conductivity of sulfur-based positive electrode materials in the prior art and the defects that the reactants are easily soluble in the electrolyte, the present invention provides a high conductivity and insoluble reactants Preparation method of carbon-coated sulfur-based composite cathode material in electrolyte, and secondary aluminum-sulfur battery with high specific capacity and good cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of vulcanized polyacrylonitrile: Mix and grind polyacrylonitrile and sublimed sulfur evenly at a ratio of 10:1, put it into a sealed quartz tube, and raise the temperature to 300°C under the condition of inert gas (nitrogen or argon) to keep After 8 hours, black vulcanized polyacrylonitrile was obtained.

[0052] (2) Coated carbon material: Weigh sucrose and vulcanized polyacrylonitrile in a ratio of 1:8, mix them evenly and place them in a closed quartz tube. The temperature was then slowly raised to 400° C. and kept for 1 hour to obtain a sulfurized polyacrylonitrile coated with carbon as the positive electrode active material.

[0053] (3) Preparation of secondary aluminum battery: Sulfurized polyacrylonitrile coated with positive active material carbon and binder LA132 (ratio: 8:2) were made into active material slurry and coated on a 0.6mm thick nickel foam substrate, baked Dry rolling to about 0.33mm, cut into 40mm wide × 15mm long pole piece as t...

Embodiment 2

[0056] (1) Preparation of vulcanized polyacrylonitrile: dissolve polyacrylonitrile in dimethylformamide solvent to prepare polyacrylonitrile solution, add Fe catalyst, heat to 200°C while stirring, keep for about 2 hours, then add elemental sulfur to it, The ratio of polyacrylonitrile to elemental sulfur is 5:1, stir evenly, heat to 350°C and keep for 10 hours to obtain vulcanized polyacrylonitrile.

[0057] (2) Coated carbon material: Disperse the carbon material in an ethanol solvent to form a mixed solution, place vulcanized polyacrylonitrile in it, the ratio of carbon material and vulcanized polyacrylonitrile is 1:10, stir and mix evenly until the solvent volatilizes, then Under the condition of an inert gas (nitrogen or argon), the temperature is first rapidly raised to 200°C, then slowly heated to 350°C, and kept for 5 hours to obtain a positive active material carbon-coated vulcanized polyacrylonitrile.

[0058] (3) Preparation of secondary aluminum battery: Sulfurized ...

Embodiment 3

[0061] (1) The preparation of vulcanized polyacrylonitrile is the same as in Example 1.

[0062] (2) Coated carbon material: change the sucrose to cellulose acetate, first rapidly raise the temperature to 300°C, and then slowly raise the temperature to 450°C, and the rest are the same as in Example 2.

[0063] (3) The preparation of the secondary aluminum battery is the same as in Example 2.

[0064] During the battery charge-discharge cycle test, charge at 1C to 2.5V, discharge at 0.1C, and the discharge cut-off voltage is 1.2V. The open-circuit voltage of the battery is 1.71V, the highest discharge capacity is 674mAh, and the discharge capacity after 50 charge-discharge cycles is 472mAh.

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Abstract

The invention discloses a novel high-energy secondary aluminum battery. The novel high-energy secondary aluminum battery comprises a positive electrode, a negative electrode and electrolyte, wherein a positive electrode active material is a sulfur-based composite material coated with a carbon material, wherein the sulfur-based composite material is vulcanized polyacrylonitrile; the negative electrode is an aluminium-containing negative electrode, and the electrolyte is non-aqueous aluminium-containing electrolyte. The secondary aluminum battery disclosed by the invention is high in specific capacity and circulating performance; and a preparation process is simple and the novel high-energy secondary aluminum battery is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of electrochemical and new energy products, and relates to a preparation method of a carbon-coated sulfur-based composite material, and also relates to a secondary aluminum battery using the composite material and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic and communication devices, the demand for secondary batteries is more urgent, and more and more tends to develop dense, thin, small, light and high energy density batteries. The energy density of aluminum is 2980mAh / g, and it is light in weight, low in price, rich in resources, and safe to use. It is an ideal battery negative electrode material; The application in the secondary battery has been relatively extensive. Therefore, the secondary aluminum-sulfur battery with aluminum metal or aluminum alloy as the negative electrode and sulfur-based materials as the positive electrode is the most attractive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/054
CPCH01M4/139H01M4/362H01M10/054Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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