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CoO-Co composite material with core-shell structure and preparation method thereof

A technology of core-shell structure and composite materials, which is applied in the field of electrochemistry, can solve problems such as complex process operation, low energy density of materials, and inconspicuous advantages, and achieve the effects of good cycle stability, simple preparation method, and low equipment requirements

Inactive Publication Date: 2011-01-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can significantly improve the cycle stability of CoO, the reversible capacity is lower than 600mAh / g, and the tap density of graphite hollow spheres is low, which will inevitably reduce the energy density of the material.
In addition, the process is complex and unfavorable for industrialization
Recently Electrochemistry Communications 11(2009) 262-265 reported a core-shell structure Cu 2 O / Cu composite materials can effectively improve the electrochemical performance. The principle is that the presence of metal Cu can improve the electrical conductivity of the material on the one hand, and promote the Li 2 The reversible decomposition of O and SEI films is a very effective way to improve electrochemical performance, but due to Cu 2 Active Material Cu in O / Cu Composite System 2 The theoretical capacity of O itself is only 380mAh / g, so the stable reversible capacity of the composite material is only 360mAh / g, which is not obvious compared with commercial graphitized carbon materials

Method used

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  • CoO-Co composite material with core-shell structure and preparation method thereof
  • CoO-Co composite material with core-shell structure and preparation method thereof
  • CoO-Co composite material with core-shell structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] 1) Co(NO 3 ) 2 ·6H 2 O and block polyether F-127 were dissolved in n-hexanol to obtain a red transparent solution, which was transferred to a high-pressure reactor and reacted at 180°C for 5 hours. After the reaction was completed, filter, wash the obtained solid, and dry it in vacuum In the oven, dry at 100°C for 12h to obtain spherical Co 3 o 4 Precursor; Wherein, Co(NO 3 ) 2 ·6H 2 The concentrations of O and block polyether F-127 were 20g / L and 26.7g / L, respectively;

[0021] 2) will Co 3 o 4 The precursor was heat-treated at 300 °C in air for 2 h, cooled, and then heated in H 2 / Ar mixed gas (mixed gas, H 2 The volume percentage is 5%) under protective conditions, heat treatment at 300 ° C for 1 h, to obtain a CoO-Co composite material with a core-shell structure.

Embodiment 2

[0023] 1) with step 1) among the embodiment 1;

[0024] 2) will Co 3 o 4 The precursor was heat-treated at 300 °C in air for 2 h, cooled, and then heated in H 2 / Ar mixed gas (mixed gas, H 2 The volume percentage is 5%) under protective conditions, heat treatment at 250 ° C for 1.5 h, to obtain a CoO-Co composite material with a core-shell structure.

Embodiment 3

[0026] 1) Co(NO 3 ) 2 ·6H 2 O and block polyether F-127 were dissolved in n-hexanol to obtain a red transparent solution, which was transferred to a high-pressure reactor and reacted at 180°C for 10 hours. After the reaction was completed, filter, wash the obtained solid, and dry it in vacuum In the oven, dry at 100°C for 12h to obtain spherical Co 3 o 4 Precursor; Wherein, Co(NO 3 ) 2 ·6H 2 The concentrations of O and block polyether F-127 were 20g / L and 26.7g / L, respectively;

[0027] 2) will Co 3 o 4 The precursor was heat-treated at 300 °C in air for 2 h, cooled, and then heated in H 2 / Ar mixed gas (mixed gas, H 2 The volume percentage is 5%) under protective conditions, heat treatment at 250 ° C for 2 hours, to obtain a CoO-Co composite material with a core-shell structure.

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Abstract

The invention relates to a CoO-Co composite material with a core-shell structure and a preparation method thereof. The shell layer of the composite material is a porous CoO hollow sphere, and the diameter of the shell layer is between 250 and 300nm; and the core is one or two metal Co solid spheres each having a diameter of between 50 and 180nm. The preparation method comprises the following steps of: preparing Co3O4 with a porous structure by a solvothermal method; and then preparing the CoO-Co composite material with the core-shell structure by taking the Co3O4 as a precursor by a low-temperature solid-phase reduction method. The CoO-Co composite material has the advantages of simple and practicable preparation method, high cyclical stability of products used as cathodes of lithium ion batteries, high specific capacity and the like.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material, in particular to the preparation of a nano-oxide composite material, which belongs to the field of electrochemistry. Background technique [0002] Compared with traditional lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have been widely used in small electronic products due to their advantages such as high output voltage, high energy density, low self-discharge rate, and long life. However, with the continuous development of society, in order to improve the utilization rate of energy, there are further requirements for the volume, capacity and safety of lithium-ion batteries. The positive and negative electrode materials of lithium-ion batteries are important factors that determine the battery capacity and safety. The current commercial negative electrode materials are mainly graphitized carbon negative electrodes. The theoretical capacity of this mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/52H01M4/62H01M4/04
CPCY02E60/10
Inventor 张丽娟胡朴田瑞丽夏定国
Owner BEIJING UNIV OF TECH