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Lithium-sulfur battery anode material, preparation method thereof, anode piece and lithium-sulfur battery

A lithium-sulfur battery and cathode material technology, applied in the field of electrochemical energy storage, can solve problems such as complex methods, lack of strong affinity, and inability to achieve cathode performance, and achieve the effects of promoting conversion, promoting utilization, and good reactivity

Active Publication Date: 2019-05-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, the above-mentioned methods of physical coating and chemical adsorption are relatively complicated, and it is still impossible to achieve practical positive electrode performance; and the above-mentioned methods can only achieve effective adsorption of polysulfides, and there is no strong affinity with polysulfides. , its surface does not have abundant active sites, but it cannot realize the effective conversion of polysulfides into low-valence lithium sulfide on its surface

Method used

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  • Lithium-sulfur battery anode material, preparation method thereof, anode piece and lithium-sulfur battery
  • Lithium-sulfur battery anode material, preparation method thereof, anode piece and lithium-sulfur battery
  • Lithium-sulfur battery anode material, preparation method thereof, anode piece and lithium-sulfur battery

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preparation example Construction

[0036] refer to figure 2 , the preferred embodiment of the present invention also provides a preparation method of lithium-sulfur battery cathode material, comprising the following steps:

[0037] Step S1, providing at least two metal salts, a sulfur-containing precursor and graphene oxide;

[0038] Step S2, adding the metal salt and the graphene oxide into a solvent for mixing, and heating in the first stage to obtain a first dispersion;

[0039] Step S3, mixing the sulfur-containing precursor with the first dispersion, and heating in the second stage to obtain a second dispersion;

[0040] Step S4, separating the solid in the second dispersion liquid and drying to obtain a graphene-supported metal sulfide composite material; and

[0041] Step S5, compounding the graphene-supported metal sulfide composite material and sulfur particles to obtain the lithium-sulfur battery cathode material.

[0042] In step S1, the sulfur-containing precursor in the sulfur-containing precur...

Embodiment 1

[0055] Add 160 mg of graphene oxide into 80 mL of deionized water and sonicate for 2 hours to obtain a concentration of 2 gL -1 Graphene oxide dispersion liquid, then take nickel chloride and cobalt chloride as metal salt, weigh 20mg nickel chloride and cobalt chloride respectively and join in the described graphene oxide dispersion liquid and stir for 1h, obtain mixed solution; The mixed solution was heat-treated at 120° C. for 6 hours to obtain the first dispersion containing nickel and cobalt hydroxide; 80 mg of thiourea was added to the first dispersion as a sulfur-containing precursor, and then at 180 Insulate at ℃ for 6 hours to carry out the second-stage heat treatment to obtain a second dispersion liquid containing nickel-cobalt sulfide supported by graphene; suction filter and freeze-dry the second dispersion liquid to obtain a graphene-supported metal sulfide composite material; After uniformly mixing the graphene-supported metal sulfide composite material and sulfur...

Embodiment 2

[0057] The difference from Example 1 is that the metal salt is tungsten chloride and cobalt chloride, and the heat treatment process in the first stage is 180° C. for 12 hours.

[0058] Other steps are the same as in Example 1 and will not be repeated here.

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Abstract

The invention discloses a lithium-sulfur battery anode material, which comprises graphene, metal sulfide and sulfur granules, wherein the metal sulfide comprises at least two transition metal sulfides, and the metal sulfides and the sulfur granules are jointly loaded to the surface of the graphene. The invention also provides a method for preparing the lithium-sulfur battery anode material, the anode sheet comprising the lithium-sulfur battery anode material and a lithium-sulfur battery. The lithium-sulfur battery anode material provided by the invention has a structure that at least two metalsulfides are tightly embedded in the surface of the graphene to form an electric-conduction network structure, a channel is provided for the quick transmission of electrons and ions, the polarity characteristics of the metal sulfides and the characteristic that an edge is rich in active sites can be used for accelerating polysulfide to be converted into lithium persulfide and lithium sulfide in alithium-sulfur battery anode reaction process, the use ratio of active substances in the lithium-sulfur battery is improved, and finally, the lithium-sulfur battery is accelerated to be practical.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a lithium-sulfur battery cathode material, a preparation method thereof, a cathode sheet and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries in the field of electrochemical energy storage have ultra-high theoretical capacity (2600Wh Kg -1 ) and won the favor of scholars, but during the charging and discharging process of lithium-sulfur batteries, the intermediate valence polysulfides generated by sulfur have poor affinity with carbon-based materials, and are easy to dissolve into the electrolyte and cause side reactions, which causes the activity The loss of material leads to the rapid attenuation of the performance of lithium-sulfur batteries. In view of the capacity fading problem caused by the easy diffusion of polysulfides from the cathode, the sulfur cathode as the source of polysulfides is the focus of attention. Some scholars...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/052B82Y30/00
CPCY02E60/10
Inventor 吕伟牛树章张思伟游从辉杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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