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Electrode and preparation method thereof

A technology of electrode and negative charge, which is applied in the field of electrode and its preparation, can solve the problems of low safety and reliability, and achieve the effects of improving safety and reliability, prolonging cycle life, and avoiding metal burrs

Pending Publication Date: 2022-07-08
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the low safety and reliability defects of existing lithium batteries, thereby providing an electrode and its preparation method

Method used

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  • Electrode and preparation method thereof
  • Electrode and preparation method thereof
  • Electrode and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0042] This embodiment provides an electrode, including: a porous current collector, the material of which is MXene material; and an active material, the active material is supported in the pores of the porous current collector. In the above electrodes, the material of the current collector is MXene material with excellent electrical conductivity, which avoids the generation of metal burrs during the electrode preparation process, thereby reducing the risk of short circuit in the lithium battery and improving the safety and reliability of the lithium battery; at the same time, The current collector prepared by using the MXene material has a porous structure, and the porous current collector can relieve the volume expansion of the active material during the charging and discharging process of the lithium battery, which is beneficial to prolong the cycle life of the battery. In addition, the active material is loaded in the pores of the porous current collector, which improves th...

Embodiment 2

[0052] This embodiment provides an electrode, the preparation method of which includes the following steps:

[0053] Preparation of negatively charged MXene materials: the ceramic phase precursor MAX is sequentially etched and washed with water, and the etchant used in the etching step includes hydrofluoric acid; the chemical formula of the negatively charged MXene material is M n+1 X n T x , where M is a transition metal element, X is a carbon or nitrogen element, and T is a surface functional group OH － , O － and F － At least one of n=1, 2 or 3.

[0054] Preparation of the second suspension: add the active substance to absolute ethanol, ultrasonically treat it at 100W for 5 min, and then stir at 100 rpm for 3 min to fully infiltrate the active substance in the absolute ethanol; add 18 to the absolute ethanol Alkyltrimethylammonium chloride obtains a dispersion, and the mass ratio of the cationic surfactant to the active material in the dispersion is 0.005; the dispersio...

Embodiment 3

[0058] This embodiment provides an electrode, the preparation method of which includes the following steps:

[0059] Preparation of negatively charged MXene materials: the ceramic phase precursor MAX is sequentially etched and washed with water, and the etchant used in the etching step includes hydrofluoric acid; the chemical formula of the negatively charged MXene material is M n+1 X n T x , where M is a transition metal element, X is a carbon or nitrogen element, and T is a surface functional group OH － , O － and F － At least one of n=1, 2 or 3.

[0060] Preparation of the second suspension: add the active substance to absolute ethanol, ultrasonically treat it at 50W for 10 min, and then stir at 750 rpm for 1 min to fully infiltrate the active substance in absolute ethanol; add twelve Alkyl dimethyl benzyl ammonium chloride to obtain a dispersion, the mass ratio of cationic surfactant and active material in the dispersion is 0.0001; the dispersion is stirred at 180rpm f...

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Abstract

The invention provides an electrode and a preparation method thereof, and the electrode comprises a porous current collector which is made of an MXene material; and the active substance is loaded in pores of the porous current collector. The electrode can reduce the risk of short circuit of the lithium battery and improve the safety and reliability of the lithium battery; meanwhile, the current collector prepared from the MXene material has a porous structure, and the porous current collector can relieve volume expansion of an active substance in the charging and discharging process of the lithium battery, so that the cycle life of the battery is prolonged. Besides, the active substance is loaded in the pores of the porous current collector, on one hand, the loading stability of the active substance is improved, the active substance is prevented from falling off from the porous current collector, so that the structural stability and the performance stability of the electrode are ensured, on the other hand, the transmission speed of electrons is improved, and the electric cycle performance of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrode and a preparation method thereof. Background technique [0002] As a new type of battery, lithium battery has many advantages compared with traditional batteries, such as high specific energy, stable discharge voltage, no memory effect, no toxic elements such as mercury, cadmium, and lead, and is environmentally friendly. Lithium batteries have been widely used in all walks of life. Among them, mobile phones use a single lithium battery as the power source, and new energy electric vehicles basically use lithium battery packs as the power source. The manufacturing process of lithium batteries generally includes the following steps: slurry preparation, slurry coating, electrode cutting, cell assembly, battery assembly, liquid injection and battery packaging. [0003] However, during the electrode cutting process, metal burrs are easily generated on the edge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/70H01M4/62H01M4/13H01M4/139
CPCH01M4/664H01M4/622H01M4/623H01M4/625H01M4/13H01M4/139H01M4/70Y02P70/50
Inventor 李旭东郑军华汪常李乾坤其他发明人请求不公开姓名
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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