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Preparation method of negative electrode of energy storage device, negative electrode of energy storage device, energy storage device, energy storage system and electric equipment

An energy storage system and device technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of reducing battery energy density, poor electrolyte compatibility, and different particle sizes, and achieve improved energy density, material uniformity, The effect of high energy density

Active Publication Date: 2019-04-23
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium metal can be used as the negative electrode of lithium-ion batteries, but lithium has a low melting point, is sensitive to air, and is easily oxidized, and the lithium negative electrode will form lithium dendrites, form "dead lithium" or cause internal short circuits in the battery, etc. These defects limit application of lithium anode
At present, carbon anode materials are widely used. Although commercially used carbon anode materials have high compaction density and relatively cheap prices, due to different particle sizes, many surface defects, and poor compatibility with electrolytes, There are many side reactions, resulting in unstable capacity performance, and binders and metal current collectors need to be added in the process of preparing pole pieces, which will reduce the energy density of the battery

Method used

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  • Preparation method of negative electrode of energy storage device, negative electrode of energy storage device, energy storage device, energy storage system and electric equipment
  • Preparation method of negative electrode of energy storage device, negative electrode of energy storage device, energy storage device, energy storage system and electric equipment
  • Preparation method of negative electrode of energy storage device, negative electrode of energy storage device, energy storage device, energy storage system and electric equipment

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preparation example Construction

[0053] In a first aspect, in at least one embodiment, a method for preparing a negative electrode of an energy storage device is provided, comprising the following steps: heating and pre-treating the dried paper compounded with a sulfur-containing salt under an inert atmosphere to generate a sulfur-containing gas, Then, it is further heated to realize the carbonization of the paper and the doping of sulfur to obtain the negative electrode of the energy storage device.

[0054] The preparation method of the negative electrode of the above-mentioned energy storage device is simple in process, low in cost, and suitable for industrial production. By heating the paper compounded with sulfur-containing salt twice to achieve uniform and stable doping of sulfur in carbon, forming a sulfur-doped Porous carbon fiber network material, which is the negative electrode of energy storage devices. The negative electrode does not contain metal current collectors and binders, which reduces its o...

Embodiment 1

[0092] A method for preparing a negative electrode of an energy storage device, comprising the following steps:

[0093] (a) Soak the newsprint in 12wt.% sodium sulfide solution, let stand for 10h and then vacuum dry;

[0094] (b) heating the dried paper compounded with sodium sulfide obtained in step (a) to 300° C. at a heating rate of 9° C. / min under a helium atmosphere, and keeping it warm for 2 hours;

[0095] (c) Heating to 700°C at a heating rate of 1°C / min, and keeping the temperature for 6 hours;

[0096] (d) cleaning and drying the carbonized product obtained in step (c) to obtain the negative electrode of the energy storage device.

Embodiment 2

[0098] A method for preparing a negative electrode of an energy storage device, comprising the following steps:

[0099] (a) Soak the photographic paper in 0.5wt.% sodium thiocyanate solution, let it stand for 8 hours and then dry it in vacuum;

[0100] (b) heating the dried paper compounded with sodium sulfide obtained in step (a) to 300° C. at a heating rate of 1° C. / min under a helium atmosphere, and keeping it warm for 8 hours;

[0101] (c) Heating to 1050°C at a heating rate of 8°C / min, and keeping the temperature for 6 hours;

[0102] (d) cleaning and drying the carbonized product obtained in step (c) to obtain the negative electrode of the energy storage device.

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Abstract

The invention relates to the field of new energy, and particularly provides a preparation method of the negative electrode of an energy storage device, the negative electrode of the energy storage device, the energy storage device, an energy storage system and electric equipment. The preparation method of the negative electrode of the energy storage device comprises the following steps: carrying out heating pretreatment on dried paper compounded with salt containing a sulfur element in an inert atmosphere to generate a sulfur-containing gas, further heating to realize the carbonization of thepaper and the doping of sulfur, thereby obtaining the negative electrode of the energy storage device. The method is simple in process, low in cost and suitable for industrial production. Based on themethod, the prepared negative electrode of the energy storage device is uniform and stable in structure, high in activity, and low in self weight. Therefore, the specific capacity, the energy densityand the cycle performance of the energy storage device can be improved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a preparation method of an energy storage device negative electrode, an energy storage device negative electrode, an energy storage device, an energy storage system, and an electrical device. Background technique [0002] The increasing shortage of energy and the serious change of the earth's ecological environment are gradually becoming two major obstacles to the development of human civilization. It is imperative to develop new energy sources and research and develop new pollution-free energy-saving materials and energy storage and conversion materials. With the increase of energy demand and the continuous development of the electronic market and electric vehicle market, lithium-ion batteries are favored by people due to their superior performance such as safety, environmental protection, high specific energy and good electrochemical performance. [0003] Metal lithium can be used as ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 颜祥军杨幸彭灿吴剑
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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