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Electron-rich negative electrode current collector, preparation method thereof, electrode plate and battery

An electrode pole piece, electron-rich technology, applied in the direction of electrode carrier/current collector, non-aqueous electrolyte battery, non-aqueous electrolyte battery electrode, etc. problems such as rising, to achieve the effect of simple and controllable preparation method, easy industrial production, and small interface resistance

Pending Publication Date: 2022-07-08
JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of zinc and chromium will not only lead to an increase in production costs, but also cause an increase in the interface resistance between the current collector and the pole piece, resulting in an increase in the internal resistance of the battery, which affects the capacity and cycle performance of the battery; moreover, galvanized And chrome plating will produce more industrial wastewater, especially chrome plating, because of its toxicity, it will cause serious environmental pollution, which does not conform to the new concept of green environmental protection
[0003] In addition, traditional negative electrode current collectors are often all made of metal, but the density of the metal is relatively high, resulting in a battery with a larger weight and lower energy density in the case of equal volume.

Method used

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  • Electron-rich negative electrode current collector, preparation method thereof, electrode plate and battery

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preparation example Construction

[0048] Another aspect of the present invention also provides a method for preparing the aforementioned electron-rich negative electrode current collector, comprising the following steps:

[0049] A polymer base material layer is provided, and electron-rich copper nanoparticles are plated on both sides of the polymer base material layer by vacuum magnetron sputtering to obtain two nano-copper layers;

[0050] Wherein, the preparation method of electron-rich copper nanoparticles comprises the following steps:

[0051] will [Gd 2 C] 2+ ·2e - The electret, divalent copper salt and alcohol solvent are mixed and reacted at 60℃~120℃, and then [Gd 2 C] 2+ ·2e - Electret adsorption, transfer the remaining reaction system and carry out solid-liquid separation, collect the solid phase and dry. Preferably, the magnetic substance is a magnet.

[0052] By adding [Gd 2 C] 2+ ·2e - Electron-rich copper nanoparticles are prepared from electrets and divalent copper salt precursors thr...

Embodiment 1

[0071] (1) 1 mmol of [Gd 2 C] 2+ ·2e - The electret, 0.5 mmol of copper chloride and 5 mL of hexanol were mixed, reacted at 80 °C for 50 min, and then the [Gd 2 C] 2+ ·2e - electret adsorption, the remaining reaction system is subjected to solid-liquid separation, the solid phase is collected and dried to obtain copper nanoparticles with an average particle size of 30 nm;

[0072] (2) The copper nanoparticles obtained in step (1) were prepared as a target, fixed on the cathode of the magnetron sputtering apparatus, and a 4 μm thick polyethylene terephthalate substrate layer (weight average molecular weight 100000 Da) was , surface roughness 150nm) placed on the anode of the magnetron sputtering apparatus; vacuum the magnetron sputtering apparatus to a degree of vacuum ≤5×10 -2 After Pa, fill with 10Pa argon gas, and then apply a voltage of 3000V between the cathode and the anode, so that the atoms in the target fly to the anode under the action of the electric field, on o...

Embodiment 2

[0075] It is basically the same as Example 1, except that the reaction temperature in step (1) is adjusted to be 60° C., so that the average particle size of the copper nanoparticles is 45 nm.

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Abstract

The invention relates to the technical field of new materials, in particular to an electron-rich negative current collector, a preparation method thereof, an electrode plate and a battery. According to the invention, the electron-rich nano-copper layer with charge quantity distribution of 200 eV / mm < 2 > to 500 eV / mm < 2 > is arranged on the surface of the polymer base material layer, so that the oxidation of copper can be effectively prevented, a zinc or chromium anti-oxidation layer does not need to be additionally added, the interface resistance between different metal layers in the traditional technology is greatly reduced, the performance of the current collector is improved, and the service life of the current collector is prolonged. The step of plating zinc or chromium on the surface of the copper-containing current collector is omitted, so that the production cost is effectively reduced, the pollution to the environment is smaller, and the method is more environment-friendly; in addition, the polymer and the metal are compounded, so that the energy density of the current collector is effectively improved, and compared with a traditional all-metal current collector, the battery can be made lighter and thinner.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an electron-rich negative electrode current collector and a preparation method thereof, an electrode pole piece and a battery. Background technique [0002] Due to its good electrical conductivity and low price, metallic copper is widely used to prepare negative current collectors for non-aqueous secondary batteries such as lithium batteries. However, since copper is easily oxidized in the air, which affects its performance, copper-containing anode current collectors need to be anti-oxidized during processing. In the traditional technology, the anti-oxidation treatment of the copper anode current collector is to coat its surface with a layer of zinc or chromium as a barrier layer to isolate the contact between copper and air, and to increase the storage period of the copper anode current collector to 3 month or so. However, the use of zinc and chromium will not only lead ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/04H01M4/13H01M10/052B82Y30/00B82Y40/00
CPCH01M4/667H01M4/668H01M4/661H01M4/0426H01M10/052H01M4/13B82Y30/00B82Y40/00H01M2004/027Y02E60/10H01M4/66
Inventor 王成豪李学法张国平
Owner JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
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