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A kind of Ni base alloy-graphene current collector and its preparation method and application

A graphene and current collector technology, applied in Ni-based alloy-graphene current collector and its preparation, in the field of current collector, can solve the problem of poor corrosion resistance of copper foil or aluminum foil and poor adhesion of positive and negative active materials , battery capacity reduction and other issues, to achieve the effect of improving electrochemical performance, avoiding performance failure, and reducing contact resistance

Active Publication Date: 2022-04-19
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A single copper foil or aluminum foil has poor electrolyte corrosion resistance, especially in LITFSI and other system electrolytes. In addition, it has poor adhesion to the positive and negative active materials, and is prone to electrode chip dropouts, which will lead to a decrease in battery capacity. decrease, increase internal resistance, cycle failure, and even cause thermal runaway, causing safety hazards

Method used

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  • A kind of Ni base alloy-graphene current collector and its preparation method and application
  • A kind of Ni base alloy-graphene current collector and its preparation method and application
  • A kind of Ni base alloy-graphene current collector and its preparation method and application

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preparation example Construction

[0045] The present invention also provides a preparation method of Ni-based alloy-graphene current collector, and the preparation method comprises the following steps:

[0046] 1) uniformly dispersing nickel salt, boron salt, graphene and additives in a solvent to obtain a composite plating solution;

[0047] 2) The composite plating solution and current collector obtained in step 1) are coated or deposited with composite plating layers on both sides of the current collector by means of electroless plating or electrodeposition.

[0048] Optionally, nickel salt, boron salt, graphene and surfactant are respectively in weight percentage: nickel salt: 50-95%, boron salt: 2%-20%, graphene: 2%-20% and additive : 1%-20%.

[0049] Preferably, the additives are surfactants and pH adjusters;

[0050] The pH adjuster includes one of boric acid, sulfuric acid, sodium hydroxide, hydrochloric acid, nitric acid, and potassium hydroxide.

[0051] Most preferably, the additives are sodium d...

Embodiment 1

[0055] The present embodiment provides a specific preparation method of Ni-based alloy-graphene current collector, including:

[0056] 1. Weigh 100g of nickel sulfate, 5g of trimethylamine borane, 0.5g of sodium dodecylbenzenesulfonate, 4g of graphene, and 25g of boric acid, stir evenly at room temperature, and prepare 500mL of electrodeposition solution with deionized water. The pH was adjusted to 4.3 with sodium hydroxide and dilute sulfuric acid, and the Ni-based alloy-graphene electrodeposition solution was prepared by mechanical stirring in a water bath for 12 h at a temperature of 45 °C;

[0057] 2. Put the prepared electrodeposition solution in the electrodeposition tank, use the nickel plate as the anode and the copper foil as the cathode, the current density is 1.5A / dm2, the temperature is 45℃, and the time is 120s. A copper foil current collector rich in Ni-based alloy-graphene composite coating was prepared.

[0058] 3. The morphology of the prepared Ni-based alloy...

Embodiment 2

[0060] The present embodiment provides a specific preparation method of Ni-based alloy-graphene current collector, including:

[0061] 1. Weigh 50g of nickel sulfate, 20g of sodium borohydride, 0.4g of sodium dodecylbenzenesulfonate, 20g of graphene, and 19.6g of boric acid, stir evenly at room temperature, and prepare 500mL of electrodeposition solution with deionized water. Use sodium hydroxide and dilute sulfuric acid to adjust the pH to 4.2, mechanically stir in a water bath for 12 hours, and at a temperature of 45 °C to prepare a Ni-based alloy-graphene electrodeposition solution;

[0062] 2. Put the prepared electrodeposition solution in the electrodeposition tank, use the nickel plate as the anode, the copper foil as the cathode, and the current density is 1A / dm 2 , temperature 10 ℃, time 1000s. A copper foil current collector rich in Ni-based alloy-graphene composite coating was prepared.

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Abstract

The invention relates to a Ni-based alloy-graphene current collector capable of avoiding performance failure caused by active material falling off, improving the electrochemical performance of the battery cell, and improving safety performance, as well as its preparation method and application. Coating or deposition on both sides of the current collector is effective. A composite coating, the composite coating is an amorphous nanocrystalline composite coating that uses graphene as a nucleus to induce the growth of a Ni-B alloy. The Ni-based alloy-graphene layer prepared by the present invention has excellent corrosion resistance, and can adapt to electrolytes of various systems such as LITFSI; graphene has excellent electrical conductivity, can reduce the direct contact resistance between the active material and the current collector, and improve The electrochemical performance of the battery cell; the prepared composite coating has a strong binding force directly with the current collector and the active material, which can avoid the performance failure caused by the shedding of the active material; graphene has excellent thermal conductivity, which can reduce the thermal runaway phenomenon of the battery cell , improve safety performance.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to a current collector, in particular to a Ni-based alloy-graphene current collector capable of avoiding performance failure caused by shedding of active materials, improving the electrochemical performance of a battery cell, and improving safety performance and a preparation method thereof. with application. Background technique [0002] Since Sony commercialized lithium batteries in 1990, lithium batteries have developed rapidly, and their energy density, cycle life, and safety performance have been significantly improved, and the market size they occupy is increasing. It is estimated that the global lithium ion battery market size in 2020 It will exceed 200 billion Wh, with an average annual compound growth rate of nearly 25%. [0003] However, as the market demands higher and higher performance of lithium batteries, people have been working to improve and change the energy densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/583H01M4/62H01M4/66H01M10/0525C01B32/182
CPCH01M4/667H01M10/0525H01M4/583H01M4/625H01M4/525C01B32/182Y02E60/10
Inventor 张文屠芳芳陈冬刘桃松李敏张焱杨东辉胡雨萌
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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