Preparation method of manganese cobalt oxide/porous carbon microsphere negative electrode material and product and application thereof

A negative electrode material, porous carbon technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of small diffusion coefficient, low conductivity, large volume change, etc. Chemical properties, the effect of simple preparation process

Inactive Publication Date: 2019-08-23
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon materials are the earliest materials studied by people and applied to the commercialization of lithium-ion batteries. There are some defects: when the battery is formed, it reacts with the electrolyte to form an SEI film, resulting in the consumption of the electrolyte and a low initial coulombic efficiency; when the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode, forming lithium dendrites and causing a short circuit , causing the temperature to rise and the battery to explode; in addition, the diffusion coefficient of lithium ions in carbon materials is small, which makes the battery unable to achieve high current charge and discharge, thus limiting the application range of lithium ion batteries
However, the disadvantages of the material, such as large volume change and low conductivity during charging and discharging, limit its application.

Method used

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  • Preparation method of manganese cobalt oxide/porous carbon microsphere negative electrode material and product and application thereof
  • Preparation method of manganese cobalt oxide/porous carbon microsphere negative electrode material and product and application thereof
  • Preparation method of manganese cobalt oxide/porous carbon microsphere negative electrode material and product and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] A manganese cobalt oxide / porous carbon microsphere negative electrode material is prepared according to the following steps:

[0026] (1) Dissolve 20 mmol of manganese chloride, 10 mmol of cobalt chloride and 20 mmol of sodium citrate in 100 mL of deionized water;

[0027] (2) Slowly add 100 mL of absolute ethanol to the above solution, and heat and magnetically stir in a water bath at 60 °C for 1.5 h to form a precipitate;

[0028] (3) The above precipitate was washed three times with deionized water and ethanol, and then freeze-dried at -80 °C for 24 h to obtain the manganese cobalt citrate precursor;

[0029] (4) The above precursor was calcined at 700 °C for 3 h under an inert argon atmosphere to obtain Mn 2 CoO 4 / Porous carbon microspheres.

[0030] figure 1 is Mn 2 CoO 4 / XRD pattern of porous carbon microspheres. This material corresponds to JCPD#23-408. It has a square spinel structure. The spinel structure is conducive to the insertion and extraction of...

Embodiment 2

[0032] A manganese cobalt oxide / porous carbon microsphere negative electrode material is prepared according to the following steps:

[0033] (1) Dissolve 20 mmol manganese acetate, 10 mmol cobalt acetate and 20 mmol sodium citrate in 100 mL deionized water;

[0034] (2) Slowly add 100 mL of absolute ethanol to the above solution, and heat and magnetically stir in a water bath at 60 °C for 1.5 h to form a precipitate;

[0035] (3) The above precipitate was washed three times with deionized water and ethanol, and then freeze-dried at -80 °C for 24 h to obtain the manganese cobalt citrate precursor;

[0036] (4) The above precursor was calcined at 800 °C for 3 h under an inert argon atmosphere to obtain Mn 2 CoO 4 / Porous carbon microspheres.

[0037] figure 2 is Mn 2 CoO 4 / Cycle diagram of porous carbon microspheres at a current density of 100 mA / g, the first discharge specific capacity is 1380 mAh / g, the second discharge specific capacity is 710 mAh / g, after 50 cycles,...

Embodiment 3

[0039] A manganese cobalt oxide / porous carbon microsphere negative electrode material is prepared according to the following steps:

[0040] (1) Dissolve 20 mmol manganese acetate, 10 mmol cobalt acetate and 20 mmol potassium citrate in 100 mL deionized water;

[0041] (2) Slowly add 100 mL of absolute ethanol to the above solution, and heat and magnetically stir in a water bath at 80 °C for 1 h to form a precipitate;

[0042] (3) The above precipitate was washed three times with deionized water and ethanol, and then freeze-dried at -80 °C for 48 h to obtain the precursor of manganese cobalt citrate;

[0043] (4) The above precursor was calcined at 600 °C for 5 h under an inert argon atmosphere to obtain Mn 2 CoO 4 / Porous carbon microspheres.

[0044] image 3 is Mn 2 CoO 4 / Porous carbon microspheres Mn under the condition of current density of 100 mA / g 2 CoO 4 / The first charge and discharge diagram of porous carbon microspheres, the first charge specific capacity ...

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Abstract

The invention provides a preparation method of a manganese cobalt oxide / porous carbon microsphere negative electrode material and a product and application thereof. A mangano-cobalt citric acid precursor is prepared by a water bath assisted freeze drying method, and Mn2CoO4 / porous carbon microspheres are prepared by calcining in argon atmosphere. The in-situ porous carbon coating can further improve the electrical conductivity of the material, prevent the material from becoming larger and the structure from collapsing and then improve the electrochemical properties of the material. The cycle diagram is under the condition of current density of 100mA / g, the first discharge specific capacity is 1380 mAh / g and the second discharge specific capacity is 710 mAh / g. After 50 cycles, the dischargespecific capacity is about 366 mAh / g, and the capacity retention rate is 51.5% in comparison with the second discharge specific capacity. The first specific discharge capacity of Mn2CoO4 is increasedby the complex to a certain extent so that that preparation process is relatively simple and easy to operate.

Description

technical field [0001] The present invention relates to a kind of preparation method of negative electrode material of lithium ion battery, particularly relate to a kind of manganese cobalt oxygen / porous carbon microsphere (Mn 2 CoO 4 ) The preparation method, product and application of negative electrode materials belong to the field of energy materials. Background technique [0002] With the advancement of technology, lithium-ion batteries will be widely used in fields such as electric vehicles, aerospace and biomedicine. Therefore, the research and development of lithium-ion batteries and related materials for power is of great significance. For lithium-ion batteries for power, the key is to increase the power density and energy density, and the root of the increase in power density and energy density is the improvement of electrode materials, especially the improvement of negative electrode materials. [0003] Carbon materials are the earliest materials studied by peop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/502H01M4/523H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 何丹农吴晓燕林琳陈振王敬锋徐少洪陈超金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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