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Preparation method of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material and application of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material

A technology for composite materials and negative electrode materials, which is applied in the field of preparation of Fe4[Fe6]3Co3[Co6]2 composite materials, can solve the problem of not meeting the needs of high-power electronic equipment and continuous use, existing safety hazards, and poor rate performance and other issues, to achieve the effect of low preparation cost and broad commercial application prospects

Inactive Publication Date: 2015-11-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
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Problems solved by technology

The lithium ion diffusion coefficient of graphitized carbon material as the negative electrode material is low, and the rate performance is not good. The theoretical capacity of graphite is only 370mAh / g, which cannot meet the needs of high-power electronic equipment and continuous use.
Due to the formation of solid electrolyte interphase film during the charging and discharging process of lithium-ion batteries, its cycle performance is poor and there are potential safety hazards

Method used

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  • Preparation method of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material and application of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material
  • Preparation method of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material and application of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material
  • Preparation method of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material and application of Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material

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Embodiment 1

[0032] Prepare a hydrochloric acid solution with a concentration of 0.1mol / L, measure 50mL, add polyvinylpyrrolidone (K309mmol), mix well, then add potassium hexacyanocobaltate (Ⅲ) (0.3mmol) and hexacyanoferric (Ⅱ) Potassium acid (0.3mmol). Stir at room temperature for 15 min. After mixing evenly, transfer it to an 80mL reaction kettle, place the reaction kettle in an oven, raise the temperature from room temperature to 160℃ at a rate of 3-5℃ / min, keep it warm for 48h, cool to room temperature, and centrifuge the separated product with deionized water Alternately washed with ethanol for 6 times, and dried in a vacuum oven at 60°C to obtain Fe 4 [Fe(CN) 6 ] 3 co 3 [Co(CN) 6 ] 2 composite material.

[0033] The electrochemical performance of the composite electrode material was tested by a button simulated battery. The slurry used when assembling the battery is a mixed slurry composed of active material, carbon black and sodium carboxymethyl cellulose, and the mass ratio...

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Abstract

The invention discloses a preparation method of an Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material and an application of the Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material. The method disclosed by the invention comprises the following steps: dissolving potassium ferricyanide (II) and tripotassium hexacyanocobaltate (III) into a hydrochloric acid solution, stirring the solution evenly, and transferring the solution into a stainless steel reaction kettle employing polytetrafluoroethylene as a liner; and slowly heating the solution from room temperature, and carrying out heat preservation and separating, washing and drying treatment, so as to obtain the Fe4[Fe(CN)6]3@Co3[Co(CN)6]2 composite material, wherein the mass ratio of Fe4[Fe(CN)6]3 to Co3[Co(CN)6]2 is (1:0.5) to (1:2). When the composite material is used as a lithium-ion battery anode material, the battery has relatively high charge-discharge specific capacity (783.7mAh / g) when charging and discharging at the current density of 100mA / g, and is excellent in cycle performance.

Description

technical field [0001] The present invention relates to a kind of Fe 4 [Fe(CN) 6 ] 3 co 3 [Co(CN) 6 ] 2 The preparation method and application of composite materials belong to the technical field of functional materials. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras, artificial satellites, electric vehicles, new Energy vehicles, aerospace and water power, fire power, wind power, solar power plants and other energy storage power systems are ideal energy carriers for the development of the 21st century. In 1991, Sony Corporation released the first commercial lithium-ion battery, which made lithium-ion batteries a research hotspot for researchers from all over the world, and at the same time revolutionized the power supply of current electronic products. With the widespread use of digital products such as mobile phones and notebook computers, lithium-ion batteries have been widely used in s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/366H01M4/58H01M10/0525Y02E60/10
Inventor 曹敏花张天宝
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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