A lithium-ion battery sns hybrid energy storage negative plate and preparation method thereof

A lithium-ion battery and hybrid energy storage technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low specific capacity of the negative electrode and shedding of active materials, so as to improve the conductivity of the electrode, prevent pulverization and shedding, and buffer The effect of volume change

Active Publication Date: 2020-05-08
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a lithium-ion battery SnS-based hybrid energy storage negative plate and its preparation method, to solve the problem that the existing lithium-ion battery negative electrode has a low specific capacity and the active material in the existing SnS negative electrode is easy to collect Problems with shedding on fluid

Method used

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  • A lithium-ion battery sns hybrid energy storage negative plate and preparation method thereof
  • A lithium-ion battery sns hybrid energy storage negative plate and preparation method thereof
  • A lithium-ion battery sns hybrid energy storage negative plate and preparation method thereof

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preparation example Construction

[0038] The preparation method of the SnS-based composite energy storage electrode of the present invention is realized through the following steps:

[0039] Step 1. Weigh 100 parts by weight of SnS / coal-based activated carbon / graphene composite energy storage active material, 7-13 parts of copper-loaded acetylene black, 10-18 parts of 10% by mass N of polyvinylidene fluoride -Methylpyrrolidone solution, 100 to 200 parts of N-methylpyrrolidone, mixed at room temperature to form a negative electrode paste, then evenly coated the negative electrode paste on the copper foil, and then dried at 80°C to obtain a SnS-based composite energy storage electrode ;

[0040] Step 2, adding dopamine hydrochloride into the solution of oxidized mesophase carbon microspheres, and ultrasonicating for 30-60 minutes; wherein, the ratio of the volume of oxidized mesophase carbon microspheres solution to the mass of dopamine hydrochloride is 99.5-99.9mL:0.1~ 1.0 g, and then evenly coat the solution ...

Embodiment 1

[0052] Example 1: This embodiment is a SnS-based hybrid energy storage negative plate for a lithium ion battery, including a SnS-based composite energy storage electrode and a coated buffer carbon layer. In addition to the SnS / coal-based activated carbon / graphene composite active material, polyvinylidene fluoride and copper-loaded acetylene black are added to the SnS-based composite energy storage electrode. Among them, taking the mass of SnS / coal-based activated carbon / graphene composite material as the base, polyvinylidene fluoride accounts for 7% to 13% of the base, and acetylene black loaded with copper accounts for 10% to 18% of the base. The buffer carbon layer is prepared by ultrasonically mixing the oxidized mesophase carbon microsphere solution and dopamine hydrochloride, directly coating the outer surface of the SnS-based composite energy storage electrode and drying, wherein the volume of the oxidized mesophase carbon microsphere solution and the dopamine The ratio ...

Embodiment 2

[0054] Embodiment 2: The difference between this embodiment and specific example 1 is that the preparation method of the oxidized mesophase carbon microsphere solution is: 1. A three-necked flask is placed in an ice-water bath, and then 15g of concentrated phosphoric acid and 150g of concentrated sulfuric acid are added respectively , then add 6g of mesophase carbon microspheres into a three-necked flask, stir for 20min, then add 25g of potassium dichromate in 4 times, stir for 30min, then place the three-necked flask at 45°C for 2h to obtain viscous thick liquid. 2. Add the viscous liquid in step 1 into distilled water, stir at 90°C for 1.5 hours, then add hydrogen peroxide, stir at room temperature for 30 hours, centrifuge, then wash with dilute hydrochloric acid and distilled water, and centrifuge for 3 to 5 times, then filter The cake was poured into distilled water and sonicated for 2 hours to form a solution of oxidized mesocarbon microspheres.

[0055] The preparation ...

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Abstract

The invention discloses an SnS mixed energy storage negative pole plate for lithium ion batteries and a method for preparing the SnS mixed energy storage negative pole plate, and belongs to energy storage negative pole plates for batteries and methods for preparing the energy storage negative pole plates. The method includes vulcanizing Sn-based composite energy storage precursor materials to prepare SnS-based composite energy storage materials, uniformly mixing the SnS-based composite energy storage materials, copper-loaded acetylene black, polyvinylidene fluoride and N-methyl pyrrolidone solution with one another to obtain mixtures, then coating the mixtures on plates and drying the plates to obtain SnS-based composite energy storage electrodes; ultrasonically mixing oxidation mesocarbonmicrobead solution and dopamine hydrochloride with each other to obtain mixtures, then directly coating the mixtures on the outer surfaces of the SnS-based composite energy storage electrodes and drying the SnS-based composite energy storage electrodes to obtain the SnS mixed energy storage negative pole plate. The SnS mixed energy storage negative pole plate, and the method have the advantages that buffer carbon layers are coated on the outer surfaces of the SnS-based composite energy storage electrodes to form the SnS mixed energy storage negative pole plate, SnS active substances in the SnS / coal-based activated carbon / graphene composite energy storage materials can be coated and immobilized by the buffer carbon layers, volume change of the SnS active substances can be restrained, and the chalking and falling of active substances on current collectors can be prevented; the specific capacity of the SnS mixed energy storage negative pole plate is 1.8-3.0 times the specific capacity ofexisting negative pole plates for existing lithium ion batteries, and the SnS mixed energy storage negative pole plate can be applied to hybrid electric vehicles and full electric vehicles.

Description

technical field [0001] The invention relates to a battery energy storage negative plate and a preparation method thereof, in particular to a lithium ion battery SnS-based hybrid energy storage negative plate and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, the consumption of fossil fuels such as oil is increasing day by day, resulting in increasingly urgent energy crisis and environmental problems. Among them, the fuel consumed by automobiles accounts for about 40% of the total oil consumption, and the research and development of new energy vehicles has been listed as a strategic emerging industry for national key development. At present, the main development object of new energy vehicles is electric vehicles, and the core of its development is the power battery, which is reflected in the specific energy, safety, price and cycle life of the battery. Among the currently practical batteries, lead-acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397Y02E60/10
Inventor 朱俊生李亚男刘旭张双全衣守忠刘昆仑
Owner CHINA UNIV OF MINING & TECH
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