Preparation method for carbon coated composite metal oxide electrode material

A composite metal and oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory improvement in charge-discharge performance and cycle performance, difficulty in controlling the amount of coated carbon, and sudden drop in battery performance. Achieve improved cycle performance, thickness uniformity, prevention of agglomeration and growth

Inactive Publication Date: 2013-10-09
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

However, the improvement of charge-discharge performance and cycle performance of such electrode materials is still not ideal. Therefore, researchers have tried to prepare a variety of carbon-coated metal oxide electrode materials. Carbon coating treatment can not only improve the conductivity of electrode materials, It can also effectively buffer the volume change of the material during charging and discharging.
Although gratifying progress has been made in the research on the modification of metal oxide electrode materials, the carbon coating process in the current experiment mostly adopts the physical mixing method. It is difficult to control the amount of carbon coated, the surface carbon and the activity of carbon by this method. The electrical contact between substances is not good, and it is easy to fall off during charging and discharging, causing a sudden drop in battery performance

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  • Preparation method for carbon coated composite metal oxide electrode material
  • Preparation method for carbon coated composite metal oxide electrode material

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Embodiment Construction

[0012] Add 0.05mol FeCl to 500mL deionized water 3 ·6H 2 O, 0.12mol SnCl 4 ·5H 2 O and 0.15mol citric acid, stirred and dissolved; the temperature of the solution was raised to 78°C, and kept for 5 hours; Aged for 12 hours; the obtained solid was calcined at 450°C for 3 hours in an air atmosphere to obtain carbon-coated SnO 2 -Fe 2 o 3 Composite oxide sample, the carbon coating amount of this material is 6% by mass.

[0013] During the electrochemical performance test of the material, the slurry was mixed according to the ratio of electrode material: acetylene black: binder = 8:1:1 (mass ratio), evenly coated on the copper foil current collector, and pressed after the electrode sheet was dried. The load of active substance is 1-2mg / cm 2 , the counter electrode selected in the single-electrode charge-discharge test is metal lithium, with 1MLiPF 6 - EC / DMC / EMC (volume ratio 1:1:1) is used as the electrolyte, assembled into a button battery.

[0014] figure 1 Transmissi...

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Abstract

The invention discloses a preparation method of a carbon coated stannic oxide (SnO2)-iron trioxide (Fe2O3) composite oxide material. During the preparation of the material, a polyaniline layer is introduced on the surface of a composite oxide by in-situ polymerization, and the carbon coated SnO2-Fe2O3 composite oxide material is obtained by a calcination method. The composite oxide material prepared by the method has the advantages of controllable particles, uniform thickness of a carbon layer; and the composite oxide material as a negative electrode material for a lithium ion battery has the characteristics of high lithium storage capacity and excellent cycling performance.

Description

【Technical field】 [0001] The invention relates to the field of electrode materials, in particular to a method for preparing a carbon-coated composite oxide electrode material. 【Background technique】 [0002] As a new type of lithium-ion battery anode material, metal oxide materials have the advantages of high theoretical capacity, abundant reserves, low cost, high chemical stability, and environmental friendliness, but their poor electrical conductivity leads to the charging and discharging of such materials. The low speed, large volume expansion during charging and discharging, and large initial irreversible capacity limit the commercial application of such materials. In recent years, researchers have tried to prepare metal oxide nanomaterials with specific morphology in an attempt to reduce the volume change of the material during charging and discharging. In addition, researchers have tried to prepare composite metal oxide electrode materials by doping different kinds of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52
CPCY02E60/10
Inventor 郭金学张晓
Owner QINGDAO UNIV OF SCI & TECH
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