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Porous metal oxide-carbon composite thin film electrode and preparation method thereof

A porous metal and thin-film electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity, large volume expansion, and poor cycle life, improve specific capacity and rate characteristics, and shorten lithium ion migration path. , the effect of improving electronic conductivity

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a porous metal oxide-carbon composite thin film electrode and its preparation method, which overcomes the poor cycle life caused by the large volume expansion of the metal oxide negative electrode material of lithium ion batteries, and the low specific capacity and poor rate performance caused by poor conductivity. The problem

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  • Porous metal oxide-carbon composite thin film electrode and preparation method thereof
  • Porous metal oxide-carbon composite thin film electrode and preparation method thereof
  • Porous metal oxide-carbon composite thin film electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Take the cobalt nitrate aqueous solution that concentration is 0.1mol / L and the NH that concentration is 5 mass % 4 The volume of each 1 part of OH aqueous solution was added successively to the above two parts of aqueous solutions respectively 3 parts of volumes of Triton X-100 (purchased from Xilong Chemical Co., Ltd., TX-100), 2 parts of volumes of normal Butanol and 40 volumes of cyclohexane were stirred at a speed of 1000 rpm for 30 minutes to obtain two water-in-oil emulsions. Mix the two water-in-oil emulsions, stir at 2000 rpm for 15 minutes, then let stand in a water bath at 40°C for 32 hours, add 10 volumes of absolute ethanol to break the emulsion, and centrifuge at 4000 rpm for 8 Minutes, and directly and uniformly coat the centrifugal sediment on one surface of the copper foil, the amount of the centrifugal sediment coated on the copper foil is 38mg / cm 2 . The copper foil coated with the precipitate was baked at 400°C for 1 hour under a nitrogen atmospher...

Embodiment 2

[0028] Take the ferric nitrate aqueous solution that concentration is 0.05mol / L and the NH that concentration is 2.5 mass % 4The volume of each 1 part of OH aqueous solution was respectively added to the above two parts of aqueous solutions successively by adding 2 parts of volume of Triton X-100 (purchased from Xilong Chemical Co., Ltd. Butanol and 20 volumes of cyclohexane were stirred at a speed of 2000 rpm for 15 minutes to obtain two water-in-oil emulsions. Mix the two water-in-oil emulsions, stir at 1000 rpm for 30 minutes, let stand in a water bath at 50°C for 24 hours, add 8 volumes of absolute ethanol to break the emulsion, and centrifuge at 3000 rpm for 10 Minutes, and directly and uniformly coat the centrifugal sediment on one surface of the copper foil, the amount of the centrifugal sediment coated on the copper foil is 8mg / cm 2 . The copper foil coated with the precipitate was calcined at 450°C for 0.5 hours in a nitrogen atmosphere, and then calcined at 300°C f...

Embodiment 3

[0030] Take the nickel nitrate aqueous solution that concentration is 0.2mol / L and the NH that concentration is 12 mass % 4 Each 1 part volume of the OH aqueous solution was added successively to the above two parts of aqueous solutions by 2.5 parts by volume of Triton X-100 (purchased from Xilong Chemical Co., Ltd., TX-100), 0.85 parts by volume of normal Butanol and 60 volumes of cyclohexane were stirred at a speed of 1500 rpm for 20 minutes to obtain two water-in-oil emulsions. Mix the two water-in-oil emulsions, stir at 1500 rpm for 20 minutes, then let stand in a water bath at 60°C for 48 hours, add 12 volumes of absolute ethanol to break the emulsion, and centrifuge at 5000 rpm for 5 Minutes, and directly and evenly coat the centrifugal sediment on one surface of the copper foil, the amount of the centrifugal sediment coated on the copper foil is 50mg / cm 2 . The copper foil coated with the precipitate was calcined at 350°C for 3 hours in a nitrogen atmosphere, and then...

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Abstract

The invention relates to a porous metal oxide-carbon composite thin-film electrode and a preparation method of the porous metal oxide-carbon composite thin-film, which belong to the technical field of lithium ion battery. The porous metal oxide-carbon composite thin film electrode free of other additional conductive agents and adhesives consists of a copper foil collector, and a porous metal oxide-carbon composite thin film on the surface of the copper foil collector. The preparation method of the porous metal oxide-carbon composite thin-film electrode comprises the following steps: blending a metal salt emulsion with an alkaline emulsion for reaction; demulsifying and centrifuging to obtain a precipitate; applying the precipitate on the surface of the copper foil collector; and calcining the copper foil collector twice to obtain the final product. The porous metal oxide-carbon composite thin-film electrode has the advantages of high specific capacity and high rate capability when used as the negative electrode of a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a porous metal oxide-carbon composite thin film electrode and a preparation method thereof. Background technique [0002] Carbon-based materials are the main anode materials for commercialized lithium-ion batteries due to their good cycle performance, low platform for lithium deintercalation, and low price. However, carbon anode materials also have some limitations, such as low specific capacity, easy formation of lithium dendrites on the surface, and thus potential safety hazards. Therefore, exploring and developing new anode materials with high power density and high energy density has important theoretical significance and practical application value. Metal oxide anode materials have high mass specific capacity and volume specific capacity (P.Poizot, S.Laruelle, S.Grugeon, L.Dupont, J-M.Tarascon, Nature, 2000,407:496.), are very commercial A new type of negativ...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 杨文胜孙洁
Owner BEIJING UNIV OF CHEM TECH
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