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A kind of preparation method of Sn-Cu alloy negative electrode material for lithium ion battery

A lithium-ion battery, sn-cu technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor mechanical stability of electrodes, poor charge-discharge cycle performance, uneven particles, etc., and achieve excellent mechanical strength and flexibility, simplifying the electrode fabrication process, and the effect that the active site is not easy

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Sn-Cu alloy is considered to be the most promising alloy material, but the main problem is that the volume change rate is very large when lithium ions are intercalated and extracted during the charging and discharging process, resulting in a serious volume effect, which leads to the deterioration of the mechanical stability of the electrode. , the charge-discharge cycle performance is not good, which seriously affects the application of this type of material
However, the high-energy ball milling method is easy to introduce impurities, low purity and uneven particles; the experimental conditions of the liquid phase reduction and electrodeposition methods are harsh, there are many influencing factors, the preparation process is complex, the cycle is long, and the yield is low

Method used

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  • A kind of preparation method of Sn-Cu alloy negative electrode material for lithium ion battery
  • A kind of preparation method of Sn-Cu alloy negative electrode material for lithium ion battery
  • A kind of preparation method of Sn-Cu alloy negative electrode material for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0030] With polyacrylonitrile (PAN), N,N-dimethylformamide (DMF) and stannous chloride (SnCl 2 .2H 2 O) as the initial raw material, polyacrylonitrile is added to N,N-dimethylformamide, heated to 60°C, stirred for 4h to dissolve PAN, then added stannous chloride and continued to stir under heating for 8h to obtain as The mixed solution of the electrospinning precursor solution, the mass concentration of polyacrylonitrile in the mixed solution is 10%, and the concentration of stannous chloride is 76g / L;

[0031] Put the mixed solution in the syringe, use the Cu foil as the base, and spin it on the electrospinning device, and gradually form a white spinning film layer on the receiver, which is the composite flexible film, and remove it together with the copper foil. The composite flexible film was pre-oxidized in a tube furnace under an air atmosphere. The specific conditions for the pre-oxidation were: the temperature was raised from room temperature to 220°C at a rate of 2°C / ...

Embodiment 2

[0034] With polyacrylonitrile (PAN), N,N-dimethylformamide (DMF) and stannous chloride (SnCl 2 .2H 2 O) as the initial raw material, polyacrylonitrile is added to N,N-dimethylformamide, heated to 60°C, stirred for 4h to dissolve PAN, then added stannous chloride and continued to stir under heating for 8h to obtain as The mixed solution of the electrospinning precursor solution, the mass concentration of polyacrylonitrile in the mixed solution is 15%, and the concentration of stannous chloride is 76g / L;

[0035] Put the mixed solution in the syringe, use the Cu foil as the base, and spin it on the electrospinning device, and gradually form a white spinning film layer on the receiver, which is the composite flexible film, and remove it together with the copper foil. The composite flexible film was pre-oxidized in a tube furnace under an air atmosphere. The specific conditions for the pre-oxidation were: the temperature was raised from room temperature to 280°C at a rate of 2°C / ...

Embodiment 3

[0038] With polyacrylonitrile (PAN), N,N-dimethylformamide (DMF) and stannous chloride (SnCl 2 .2H 2 O) as the initial raw material, polyacrylonitrile is added to N,N-dimethylformamide, heated to 60°C, stirred for 4h to dissolve PAN, then added stannous chloride and continued to stir under heating for 8h to obtain as The mixed solution of the electrospinning precursor solution, the mass concentration of polyacrylonitrile in the mixed solution is 10%, and the concentration of stannous chloride is 76g / L;

[0039] Put the mixed solution in the syringe, use the Cu foil as the base, and spin it on the electrospinning device, and gradually form a white spinning film layer on the receiver, which is the composite flexible film, and remove it together with the copper foil. The composite flexible film was pre-oxidized in a tube furnace under an air atmosphere. The specific conditions for the pre-oxidation were: the temperature was raised from room temperature to 280°C at a heating rate...

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Abstract

A preparation method of Sn-Cu alloy negative electrode material for a lithium ion battery comprises dissolving polyacrylonitrile and stannous chloride in N, N-dimethylformamide solution, stirring uniformly, and electrospunning to obtain spun film; and preparing three-dimensional nano-composite electrode material loaded with spherical tin-copper alloy on copper foil by pre-oxidation and heat treatment. As the flexible negative electrode material prepare by the electrostatic spinning method can realize self-support of the electrode material, the energy storage characteristic of the Sn-based material and the high conductivity of the carbon nanofibers provide a good conductive network. The spherical Sn-Cu alloys are well distributed on the carbon nanofibers with good crystallinity. The large specific surface area could further alleviate the volume effect and particle pulverization during the charge-discharge process. Sn22Cu81CNF composite electrode material has large initial capacity, highinitial chargedischarge efficiency, good cycle performance, simple preparation process, short cycle time and low cost, which is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a Sn-Cu alloy negative electrode material for lithium ion batteries. Background technique [0002] With the rapid development of the electronics and information industry, a large number of portable electronic products such as electric vehicles, mobile communication equipment, notebook computers, digital products, etc. have been widely used, which makes the public have a high demand for batteries, especially secondary rechargeable batteries Requirements, such as: higher capacity, longer service life, smaller size and lighter weight, etc. Lithium-ion batteries have attracted many people's attention due to their advantages such as high energy density, high working voltage, good load performance, and fast charging speed. [0003] Alloy anode materials for lithium-ion batteries mainly include Sn-based, Sb-based, Si-based, Al-based, ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCH01M4/387H01M10/0525Y02E60/10
Inventor 欧阳海波隋泽卉李翠艳黄剑锋费杰畅丽媛
Owner SHAANXI UNIV OF SCI & TECH