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Diaphragm negative electrode material with integrated structure, preparation method thereof and secondary battery

A negative electrode material and diaphragm technology, which is applied in the field of diaphragm negative electrode materials and its preparation, can solve the problems of poor battery safety performance, low Coulombic efficiency, and burr formation, and achieve the goal of inhibiting volume expansion and pulverization, ensuring safety performance, and increasing effective contact Effect

Inactive Publication Date: 2020-07-24
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a separator negative electrode material with an integrated structure and its preparation method and secondary battery, aiming to solve the problem that the metal foil negative electrode in the prior art is easy to cause expansion and pulverization, forming burrs and piercing the separator, resulting in The problem of poor battery safety performance and low Coulombic efficiency

Method used

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  • Diaphragm negative electrode material with integrated structure, preparation method thereof and secondary battery
  • Diaphragm negative electrode material with integrated structure, preparation method thereof and secondary battery
  • Diaphragm negative electrode material with integrated structure, preparation method thereof and secondary battery

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preparation example Construction

[0038] Correspondingly, the embodiment of the present invention also provides a method for preparing a separator negative electrode material with an integrated structure. The method comprises the steps of:

[0039] S01. Prepare a polymer solution and place it in the syringe of the electrospinning device;

[0040] S02. Place the metal negative electrode in the electrospinning device, set the power supply voltage of the electrospinning to 5-30kV, the distance between the syringe and the metal negative electrode is 5-50cm, and control the The flow rate of the solution is 300-1000 μL / h, and the polymer separator layer is prepared by electrospinning on the surface of the metal negative electrode to obtain the separator negative electrode material with the integrated structure.

[0041] The preparation method of the diaphragm negative electrode material of the integrated structure of the present invention firstly prepares a high molecular polymer solution, and adopts the preparatio...

Embodiment 1

[0075] Preparation of separator anode materials with integrated structure

[0076] According to the volume mass concentration of 10%, polyacrylonitrile (PAN) is dissolved in dimethylformamide (DMF), after stirring evenly, it is used as a polymer solution and 3 ml of the solution is placed in the syringe of the electrospinning device ;

[0077] Provide metal aluminum foil as the metal negative electrode, cut the metal negative electrode to obtain a material of suitable size, wipe the surface with alcohol, and fix it on the substrate of the electrospinning device;

[0078] The electrospinning power supply voltage is set to 15kV, the distance between the syringe and the metal negative electrode is 15cm, and the flow rate of the high molecular polymer solution is controlled to be 600μL / h. The preparation is carried out, and then dried and cut to obtain The separator negative electrode material with an integrated structure, wherein the separator negative electrode material with an...

Embodiment 2

[0085] Preparation of separator anode materials with integrated structure

[0086] According to the volume mass concentration of 10%, polyacrylonitrile (PAN) and polyvinylidene fluoride (PVDF) are dissolved in dimethylformamide (DMF) at a concentration of 7%:3% by volume mass concentration, and after stirring As a high molecular polymer solution and take 3 milliliters of the solution and place it in the syringe of the electrospinning device;

[0087] Add 0.8g of natural graphite, 0.1g of polyvinylidene fluoride, and 0.1g of conductive carbon black to 2mL of nitrogen-methylpyrrolidone; coat the uniform slurry obtained by grinding on the surface of carbon-coated copper foil, and dry it in vacuum at 80°C for 12 hours to obtain metal Negative electrode, cutting the metal negative electrode to obtain a material with a suitable size, wiping the surface with alcohol, and fixing it on the substrate of the electrospinning device;

[0088] The electrospinning power supply voltage is se...

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Abstract

The invention provides a diaphragm negative electrode material with an integrated structure and a preparation method of the diaphragm negative electrode material. The preparation method comprises thesteps of preparing a high-molecular polymer solution and putting the high-molecular polymer solution into an injector of an electrostatic spinning device; placing the metal negative electrode in the electrostatic spinning device; setting the power supply voltage of electrostatic spinning to be 5 to 30kV, wherein the distance between the injector and the metal negative electrode is 5 to 50 cm; controlling the flow rate of the high-molecular polymer solution to be 300 to 1000 [mu] L / h; and preparing a high-molecular diaphragm layer on the surface of the metal negative electrode through electrostatic spinning to obtain the diaphragm negative electrode material with the integrated structure. The polymer diaphragm layer has good flexibility and controllable porosity, and is combined with the metal negative electrode, so that the contact between the diaphragm and the negative electrode is increased, the volume expansion pulverization of the negative electrode in the use process is inhibited,the metal negative electrode is prevented from forming burrs to pierce the diaphragm, and the safety performance and coulombic efficiency of a secondary battery are improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a diaphragm negative electrode material with an integrated structure, a preparation method thereof, and a secondary battery. Background technique [0002] As a new type of energy storage device, lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and small self-discharge, and are widely used in various portable mobile devices and electric vehicles. Lithium-ion batteries are mainly composed of positive and negative electrodes, separators, and electrolytes, and are assembled in the form of stacking negative electrodes, separators, and positive electrodes in sequence. When charging, lithium ions are extracted from the positive electrode material and migrate to the negative electrode active material; when discharging, lithium ions are extracted from the negative electrode active material and return to the positive electrode. Tradi...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M2/14H01M2/16H01M4/134H01M10/0525H01M50/403H01M50/414
CPCH01M4/1395H01M4/134H01M10/0525H01M2004/027H01M50/403H01M50/46Y02E60/10
Inventor 唐永炳李晋李翔龚德才欧学武
Owner SHENZHEN INST OF ADVANCED TECH
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