coo/comoo 4 Preparation of composite materials and their application in lithium-ion batteries

A lithium-ion battery and composite material technology, applied in the field of micro-nano material synthesis, can solve the problems of cycle, poor rate performance, low conductivity, poor lithium battery performance, etc., and achieve the effects of complete structure, good crystallinity and low cost

Active Publication Date: 2020-05-15
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on this idea, some transition metal oxide complexes have been synthesized for Li-ion batteries, for example, ZnO / ZnFe 2 o 4 , CoO / CoFe 2 o 4 and Fe 2 o 3 / NiFe 2 o 4 , these prove that the lithium battery performance of the composite is better than that of a single material, but the lithium battery performance of the composite material prepared by using the above raw materials and methods is still not good, such as low conductivity, poor cycle and rate performance, so , it is urgent to develop a new composite material with excellent electrochemical performance

Method used

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  • coo/comoo <sub>4</sub> Preparation of composite materials and their application in lithium-ion batteries
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  • coo/comoo <sub>4</sub> Preparation of composite materials and their application in lithium-ion batteries

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Embodiment 1

[0027] A kind of CoO / CoMoO described in this embodiment 4 (CCMO) The preparation method of composite material is to make according to the following synthetic steps:

[0028] Dissolve 2mmol cobalt acetate tetrahydrate and 1.5mmol sodium molybdate dihydrate (that is, the Co / Mo molar ratio is 4:3) in 30ml distilled water, and stir for 30min to form a uniform and transparent solution, and then transfer the resulting transparent solution to 50ml In a polytetrafluoroethylene reaction kettle, put the reaction kettle into an oven and heat it to 180°C, then react at a constant temperature for 12 hours, and finally cool to room temperature, wash the obtained precipitated product alternately with deionized water and absolute ethanol for 3 times, centrifugal filter and place in Vacuum drying at 80°C for 12 hours to obtain product 1; then place the obtained product 1 in a tube furnace, control the calcination temperature to 500°C, calcinate in air atmosphere for 3 hours, and finally cool t...

Embodiment 2

[0040] The CoO / CoMoO that above-mentioned embodiment 1 makes respectively 4 Composite material and pure CoMoO prepared in Comparative Example 1 4 The electrochemical performance test of the material is carried out, and the test method is as follows:

[0041] Electrochemical performance tests were evaluated by assembling CR2025 coin cells in an argon-filled glove box. The synthetic material is the active material, PVDF and acetylene black are added to NMP (methylpyrrolidone) at a weight ratio of 8:1:1 and coated on the copper foil (thickness: 100 μm), then placed in a vacuum oven at 80°C for 12h . The copper electrode was cut into small discs with a diameter of 12 mm (mass of active material> 1 mg) as the working electrode of the 2025 coin cell, wherein the counter electrode was lithium, and the diaphragm was Celgard 2300 membrane. The electrolyte is 1mol / L LiPF 6 Dissolve in a mixed solvent of diethyl carbonate / ethylene carbonate / dimethyl carbonate volume ratio of 1:1:1. ...

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Abstract

The invention relates to a preparation method of a CoO / CoMoO4 composite material and application of the CoO / CoMoO4 composite material in a lithium ion battery. The preparation method comprises the steps of sequentially dissolving cobalt tetrahydrate and sodium molybdate dehydrate in distilled water according to a proportion being 4:3; forming a transparent solution after uniform stirring, transferring the solution to a polytetrafluoroethylene reaction kettle, placing the reaction kettle in a baking box, performing constant-temperature reaction for 12 hours after heating to 180 DEG C, cooling to a room temperature, performing vacuum drying to obtain a precursor after the obtained precipitant is washed and centrifugally filtered; and performing calcination on the obtained precursor under anair atmosphere, and finally cooling to a room temperature to obtain the CoO / CoMoO4 composite material. The material is very excellent in electrochemical performance, the lithium ion battery fabricatedby employing the material as a negative electrode material is high in charge / discharge specific capacity and relatively good in cycle property and rate performance, and the material is very suitablyused as the lithium ion battery negative electrode material; and compared with the material in the prior art, the material has great advantage and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of synthesis of micro-nano materials, more specifically, the invention relates to a CoO / CoMoO 4 Preparation methods of composite materials and their application in lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become the preferred choice of mobile electronic devices such as mobile phones and notebook computers due to their advantages such as high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, small size and low pollution. It is an ideal power source and may become one of the main power sources for electric vehicles and electric bicycles in the future. Therefore, lithium-ion batteries are called green energy and leading power sources in the 21st century, and have great potential in energy storage and conversion. The electrochemical performance of lithium-ion batteries mainly depends on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/52H01M10/0525
CPCH01M4/131H01M4/362H01M4/52H01M10/0525Y02E60/10
Inventor 冯传启王志坚郭再萍刘建文吴慧敏
Owner HUBEI UNIV
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