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A method for preparing high-power power battery negative electrode material

A technology for power batteries and negative electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor electrical contact, inability to meet, and changes in the internal structure of carbon electrodes, and achieve large specific surface area and process flow. simple effect

Active Publication Date: 2020-08-04
东莞市华东环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphitized carbon materials are the main anode materials for lithium-ion batteries, but the SEI film formed by carbon materials during the first discharge process will cause irreversible capacity loss, and sometimes lead to changes in the internal structure of carbon electrodes and poor electrical contact; The decomposition of the protective layer may lead to battery failure or cause safety problems; at the same time, the capacity per unit volume of the graphite negative electrode is relatively low, and it is difficult to meet the high energy density in fields such as electric vehicles, wind and solar energy storage, and smart grid energy storage and conversion. battery requirements

Method used

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  • A method for preparing high-power power battery negative electrode material
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Embodiment 1

[0020] A method for preparing a high-power power battery negative electrode material, characterized in that: comprising the following steps:

[0021] 1. Under magnetic stirring, add hexamethylenetetramine in deionized water, adjust the pH of the solution to ≤7 with HCl, and obtain solution A;

[0022] 2. Add polyethylene glycol to solution A, and mix well to obtain solution B. The degree of polymerization of polyethylene glycol is 600, and the amount of polyethylene glycol added is 1 / 4 of the weight of deionized water.

[0023] 3. Add FeCl to Solution B 2 4H 2 O, stirred until completely dissolved to obtain solution C; the FeCl 2 4H 2 The amount of O added is 1 / 50 of the weight of deionized water in step one.

[0024] 4. Transfer the solution C to a polytetrafluoroethylene-lined hydrothermal reaction kettle, control the filling degree of the thermal reaction kettle to 70%, the hydrothermal reaction temperature is 150°C, and the hydrothermal reaction time is 18h, and the hy...

Embodiment 2

[0027] A method for preparing a high-power power battery negative electrode material, characterized in that: comprising the following steps:

[0028] 1. Under magnetic stirring, add hexamethylenetetramine in deionized water, adjust the pH of the solution to ≤7 with HCl, and obtain solution A;

[0029] 2. Add polyethylene glycol to solution A, and mix uniformly to obtain solution B; the degree of polymerization of the polyethylene glycol is 20,000, and the amount of polyethylene glycol added is 1 / 5 of the weight of deionized water.

[0030] 3. Add FeCl to Solution B 2 4H 2 O, stirred until completely dissolved to obtain solution C; the FeCl 2 4H 2 The amount of O added is 1 / 25 of the weight of deionized water in step one.

[0031] 4. Transfer the solution C to a polytetrafluoroethylene-lined hydrothermal reaction kettle, control the filling degree of the thermal reaction kettle to 80%, the hydrothermal reaction temperature is 180°C, and the hydrothermal reaction time is 12h...

Embodiment 3

[0034] A method for preparing a high-power power battery negative electrode material, characterized in that: comprising the following steps:

[0035] 1. Under magnetic stirring, add hexamethylenetetramine in deionized water, adjust the pH of the solution to ≤7 with HCl, and obtain solution A;

[0036] 2. Add polyethylene glycol to solution A, and mix uniformly to obtain solution B; the degree of polymerization of the polyethylene glycol is 10000, and the amount of polyethylene glycol added is 0.21 times the weight of deionized water.

[0037] 3. Add FeCl to Solution B 2 4H 2 O, stirred until completely dissolved to obtain solution C; the FeCl 2 4H 2 The amount of O added was 0.03 times the weight of deionized water in step one.

[0038] 4. Transfer the solution C to a polytetrafluoroethylene-lined hydrothermal reaction kettle, control the filling degree of the thermal reaction kettle to 75%, the hydrothermal reaction temperature is 160°C, and the hydrothermal reaction time...

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Abstract

The invention relates to a method for preparing a high-power power battery negative electrode material. The method comprises the following steps: 1. hexamethylenetetramine is added into deionized water, pH value is adjusted by HCl and the pH value of the solution is less than or equal to 7, and a solution A is obtained; 2. polyethylene glycol is added into a solution A, in order to obtain a solution B; 3. FeCl2.4H2O is added into a solution B, in order to obtain a solution C; 4. the solution C is transferred to a hydrothermal reaction vessel with a polytetrafluoroethylene inner liner, fillingdegree of the hydrothermal reaction vessel is controlled at 70-80%, the reaction temperature is at 150-180 DEG C, the reaction time is 12-18 hours, and a hydrothermal reaction is carried out in orderto obtain a hydrothermal synthesis product D; 5. the hydrothermal synthesis product D is separated, washed, dried and grinded in order to obtain the battery negative electrode material. FeCl2.4H2O isused as an iron source, polyethylene glycol is used as a template, hexamethylenetetramine is used as a precipitating agent, a hydrothermal method is used for preparing a mesoporous FeCO3 material, theprocess flow is simple, the prepared mesoporous FeCO3 nano material has a large specific surface area and ordered mesoporous channels, and the material can be used as the high-power power battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a method for preparing negative electrode materials for high-power power batteries. Background technique [0002] Due to the urgent need for high-power power batteries required by new energy vehicles, and the current bottlenecks in price and safety of lithium-ion power batteries, key materials for lithium-ion power batteries are facing new challenges. At present, graphitized carbon materials are the main anode materials for lithium-ion batteries, but the SEI film formed by carbon materials during the first discharge process will cause irreversible capacity loss, and sometimes lead to changes in the internal structure of carbon electrodes and poor electrical contact; The decomposition of the protective layer may lead to battery failure or cause safety problems; at the same time, the capacity per unit volume of the graphite negative electrode is relatively low, and it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00H01M4/58H01M10/0525
CPCC01G49/00C01P2002/72C01P2004/03C01P2006/40H01M4/58H01M10/0525Y02E60/10
Inventor 田文杰王小庆曲洋李辉李冬是凡蔡娜
Owner 东莞市华东环保设备有限公司