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A preparation method of a lithium sulfide battery cathode material with high vibration density and high volume energy density

A technology of tap density and energy density is applied in the field of preparation of positive electrode materials for lithium-sulfur batteries, which can solve the problems of low volume specific energy of lithium-sulfur batteries, and achieve the effects of convenient transportation, improved tap density and environmental protection.

Inactive Publication Date: 2019-01-04
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low volume specific energy of existing lithium-sulfur batteries, and to provide a preparation method of lithium-sulfur battery cathode materials with high tap density and high volume energy density. The density of the lithium-sulfur battery cathode material with low tap density is increased by 1.5 to 3 times, and it maintains good electrochemical activity and has a high volumetric energy density

Method used

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  • A preparation method of a lithium sulfide battery cathode material with high vibration density and high volume energy density
  • A preparation method of a lithium sulfide battery cathode material with high vibration density and high volume energy density
  • A preparation method of a lithium sulfide battery cathode material with high vibration density and high volume energy density

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specific Embodiment approach 1

[0018] Specific implementation mode 1: This implementation mode records a preparation method of a lithium-sulfur battery positive electrode material with high tap density and high volumetric energy density, and the method is implemented according to the following steps:

[0019] Step 1: First, mix the carbon material and the sublimated sulfur according to the mass ratio of 1:0.5~9, and specifically mix them evenly by means of a ball mill, a grinder, a mixer, a mixer, a mill, etc., to obtain a powdery mixture before heat treatment The ball mill is purchased from Rurui Technology, model is KE-1L; the grinding machine is purchased from TRILOS company, model is TR120A; the mixer is purchased from Shenyang Beiteng Chemical Machinery Company, model is LHY-0.25; the mixer is purchased from Changzhou Zhongshi Sanshui Machinery Technology, the model is AL; the mill is purchased from Changzhou Zhongshi Sanshui Machinery Technology, the model is TCM160;

[0020] Step 2: Fill the powdery ...

specific Embodiment approach 2

[0023] Embodiment 2: A method for preparing a lithium-sulfur battery cathode material with high tap density and high volumetric energy density described in Embodiment 1. In step 1, the carbon material is activated carbon, porous carbon, carbon nanotubes , graphene, doped carbon, Ketjen black, and acetylene black, or one or more of them.

[0024] Table 1 is a statistical data table of electrode density and volume specific capacity of lithium-sulfur battery positive electrode materials prepared by common heat treatment methods and lithium-sulfur battery positive electrode materials prepared by the present invention;

[0025] Table 1

[0026]

Embodiment 1

[0028] (1) First, mix activated carbon and sublimated sulfur at a mass ratio of 1:0.5. The mixture is uniformly mixed by a ball mill to obtain a powdery mixture before heat treatment.

[0029] (2) Fill the powdery mixture before heat treatment obtained in step (1) into a mold, compact it according to a pressure of 1 MPa, and then demould to obtain a block mixture before heat treatment.

[0030] (3) Put the block mixture obtained in step (2) before heat treatment in the reaction vessel at 120 o C, heated for 2 hours until the sulfur melted, and then cooled to room temperature to obtain a heat-treated bulk composite.

[0031] (4) The heat-treated bulk compound obtained in step (3) is crushed under a crusher and passed through a 50-mesh screen to obtain a lithium-sulfur battery cathode material with high tap density and high volumetric energy density.

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Abstract

The invention relates to a preparation method of a lithium sulfide battery cathode material with high vibration density and high volume energy density, belonging to the field of energy materials. Themethod comprises the following steps: (1) mixing porous material and sulfur to obtain powdery mixture before heat treatment; (2) compacting the obtained powdery mixture before heat treatment with a mold to obtain a lump mixture before heat treatment; (3) heat treating the obtained bulk mixture before heat treatment in a reaction vessel, and then cooling to obtain the bulk composite after heat treatment; (4) grinding and sieving the heat-treated bulk composite to obtain the cathode material of lithium sulfide battery with high compaction density and high bulk energy density. The present invention has the advantages that: by compaction-heat treatment-trituration, the density of lithium sulfide battery cathode material can be improved. The porous material under pressure can contact with sulfur more tightly, so sulfur can be distributed uniformly in the porous material during heat treatment.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a preparation method of a lithium-sulfur battery cathode material with high tap density and high volume energy density. Background technique [0002] Lithium-sulfur batteries have a theoretical specific energy of up to 2600Wh / kg, which is more than five times that of existing lithium-ion batteries. In addition, due to the cheap cost and environmental friendliness of sulfur, lithium-sulfur batteries have received extensive attention and research. However, since elemental sulfur is used as the positive electrode active material in lithium-sulfur batteries, the extremely low conductivity of sulfur requires a large amount of porous carbon to prepare positive electrode materials, thereby improving the discharge capacity of lithium-sulfur batteries from the level of reaction kinetics. However, due to the rich pore structure of porous carbon materials, the tap density (0.2-0...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M4/364H01M4/38H01M4/583H01M10/052Y02E60/10
Inventor 孙克宁程俊涵张乃庆范立双
Owner HARBIN INST OF TECH
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