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Negative electrode of lithium ion secondary battery, preparation method of negative electrode, and lithium ion secondary battery

A technology for lithium-ion batteries and battery anodes, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of reduced capacity, poor cycle stability, and low theoretical capacity of graphite-based anode materials, and achieves improved specific energy and strong hydrophobicity. Performance, easy to achieve the effect of large-scale production

Inactive Publication Date: 2017-06-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the theoretical capacity of graphite-based negative electrode materials is low, only 372mAh / g, and the cycle stability is poor, and high-rate charge and discharge can easily cause a decrease in capacity. Density, high rate charge and discharge performance requirements

Method used

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  • Negative electrode of lithium ion secondary battery, preparation method of negative electrode, and lithium ion secondary battery
  • Negative electrode of lithium ion secondary battery, preparation method of negative electrode, and lithium ion secondary battery
  • Negative electrode of lithium ion secondary battery, preparation method of negative electrode, and lithium ion secondary battery

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preparation example Construction

[0052] The invention provides a kind of preparation method of lithium-ion battery negative pole, comprises the following steps:

[0053]A) under a protective atmosphere, the metal material is placed above the melamine, and after roasting, the negative electrode of the lithium ion battery is obtained;

[0054] The metal material includes one or more of iron, nickel and iron-nickel alloy.

[0055] In order to improve the performance of the manufactured product and the integrity of the overall process route, and reduce the influence of impurities and oil stains on the raw materials, the reticular metal material is preferably a pre-treated reticular metal material. The present invention has no particular limitation on the specific steps of the pretreatment, the pretreatment steps of metal materials well known to those skilled in the art can be used, and those skilled in the art can select and adjust according to actual production conditions, raw material conditions and product req...

Embodiment 1

[0094] Step 1: Take a piece of stainless steel mesh, and use dilute hydrochloric acid and absolute ethanol to clean the stainless steel mesh several times;

[0095] Step 2: Weigh 2 grams of melamine solid powder and put it into a ceramic ark. Cover the ceramic ark with a piece of carbon paper, place the cleaned stainless steel mesh on the carbon paper, and put the whole into a high-temperature tube furnace;

[0096] The third step: using argon as the protective gas, start the tube furnace to heat up to 750 degrees Celsius at a rate of 5 degrees Celsius / minute, and keep at this temperature for 2 hours;

[0097] Step 4: After heating, wait for the reactant to cool down to room temperature, take out the stainless steel mesh, wash it several times with distilled water and absolute ethanol respectively, and after drying in the air, the surface of the stainless steel mesh is covered with a layer of black matter, which is the nitrogen-doped Carbon nanotubes@stainless steel mesh integ...

Embodiment 2

[0103] Step 1: Take a piece of stainless steel mesh, and use dilute hydrochloric acid and absolute ethanol to clean the stainless steel mesh several times;

[0104] Step 2: Weigh 2 grams of melamine solid powder and put it into a ceramic ark. Cover the ceramic ark with a piece of carbon paper, place the cleaned stainless steel mesh on the carbon paper, and put the whole into a high-temperature tube furnace;

[0105] The third step: using argon as the protective gas, start the tube furnace to heat up to 800 degrees Celsius at a rate of 5 degrees Celsius / minute, and keep at this temperature for 2 hours;

[0106] Step 4: After heating, wait for the reactant to cool down to room temperature, take out the stainless steel mesh, wash it several times with distilled water and absolute ethanol respectively, and after drying in the air, the surface of the stainless steel mesh is covered with a layer of black matter, which is the nitrogen-doped Carbon nanotubes@stainless steel mesh integ...

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Abstract

The invention provides a preparation method of a negative electrode of a lithium ion secondary battery. The preparation method comprises the following steps: under the protective atmosphere, putting a metal material above melamine and roasting to obtain the negative electrode of the lithium ion battery, wherein the metal material comprises one or more of iron, nickel and iron-nickel alloy. A catalyst with a multi-pore-channel structure grows on the surface of a metal material net through a one-step method, and a bendable and super-hydrophobic integrated negative electrode material of the lithium ion secondary battery is obtained, so high pore channel utilization rate and connectivity and high mass transfer ability are achieved, and charging and discharging utilization rate and cycling times are increased. The preparation method is simple in process, convenient to operate and easy in large-scale production, a current collector and an adhesive are not needed, complex powder electrode preparation process is omitted, and the specific energy of the lithium ion battery, the energy utilization efficiency and the stability of the negative electrode are greatly improved. Moreover, high mechanical strength and high hydrophobic property are achieved under the bending condition.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, relates to a lithium ion secondary battery negative electrode and a preparation method thereof, a lithium ion secondary battery, and in particular to a flexible, superhydrophobic lithium ion secondary battery negative electrode and a preparation method thereof , Li-ion secondary battery. Background technique [0002] Lithium batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect, and high cost performance. They have become rechargeable power supplies for high-power electric vehicles, artificial satellites, aerospace and other fields. The main choice of objects. Therefore, lithium batteries and related materials have become a research hotspot for researchers. [0003] Lithium-ion batteries usually include positive electrodes, negative electrodes, separators, electrolytes and casings...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/38H01M4/583H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/38H01M4/583H01M10/0525Y02E60/10
Inventor 张新波杨晓阳鲍迪徐吉静
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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