Lithium-sulfur battery composite positive electrode material and preparation method thereof

A technology of composite materials and lithium-sulfur batteries, which is applied in the fields of battery electrodes, electrolyte storage battery manufacturing, and non-aqueous electrolyte storage batteries, etc.

Inactive Publication Date: 2015-04-22
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Comparing the reported patents, it can be seen that composite materials for lithium-sulfur batteries have been prepared by optimizing material compositio

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  • Lithium-sulfur battery composite positive electrode material and preparation method thereof
  • Lithium-sulfur battery composite positive electrode material and preparation method thereof
  • Lithium-sulfur battery composite positive electrode material and preparation method thereof

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Embodiment 1

[0029] A lithium-sulfur battery cathode composite material, which comprises oxidized carbon black, conductive polymer and elemental sulfur. Oxidized carbon black particles are the structural core of the positive electrode composite material, and the conductive polymer forms the frame of the positive electrode composite material. The conductive polymer has a spherical network pore structure, and elemental sulfur is deposited on the surface and inside of the spherical network pores. The positive electrode composite material is prepared by multi-step synthesis by in-situ polymerization method and hydrothermal method.

[0030] The preparation method of the conductive polymer composite material of this embodiment includes the following steps:

[0031] (1) Preparation of oxidized carbon black: Dissolve acetylene black in concentrated nitric acid, and apply ultrasonic dispersion method for treatment, and the treatment time is t 0 , 5mins≤t 0 ≤10mins, formulated to a concentration of n 0 S...

Embodiment 2

[0042] The preparation method of the conductive polymer composite material of this embodiment includes the following steps:

[0043] (1) Preparation of oxidized carbon black: Dissolve acetylene black in concentrated hydrochloric acid, and apply ultrasonic dispersion method for treatment, and the treatment time is t 0 , 5mins≤t 0 ≤10mins, formulated to a concentration of n 0 Solution, 0.01g / mL≤n 0 ≤0.05g / mL; put the solution in an autoclave for pressure heating treatment, the pressure is P, 0MPa≤P≤70MPa, and the heating temperature is T 0 ,60℃≤T 0 ≤200℃, processing time is t 1 , 0.5h≤t 1 ≤10h; after that, the solution is washed by ultrasonic centrifugation and the centrifugal speed is v 0 ,1000rad / min≤v 0 ≤8000rad / min; washing times is N 0 , 1≤N 0 ≤8.

[0044] (2) Preparation of monomer solution: the total mass of the battery cathode composite material after drying according to claim 1 is m 0 , Weigh oxidized carbon black m 1 , 0.05m 0 ≤m 1 ≤0.15m 0 , Dispersed at a concentration of n...

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Abstract

The invention discloses a lithium-sulfur battery composite positive electrode material and a preparation method of the lithium-sulfur battery composite positive electrode material. By adopting an in-situ polymerization method, a spherical network pore structure is formed by utilizing a conductive polymer in a carbon black grafting method, and is used as a conductive framework of a lithium-sulfur battery composite material; elemental sulfur is deposited in a hydrothermal method and sulfur is injected into network pores; the carbon black grafted conductive polymer is high in specific surface area and conductivity; the spherical network pore structure can uniformly cover sulfur and can be uniformly mixed with sulfur, so that the utilization rate of active substances is improved. The conductive polymer is high in tensile property and can be used for inhibiting volume expansion of sulfur in a charging/discharging process; bond energy constraint exists between the surface of fibers and sulfur, so that adsorption capacity is provided to prevent sulfur from being diffused and lost toward the outside, thereby increasing the circulation stability and capacity retention ratio of the lithium-sulfur battery.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery cathode composite material and a preparation method thereof, and belongs to the field of chemical energy storage materials. The invention forms a special spherical network structure by grafting a conductive polymer frame on the surface of oxidized carbon black to inhibit the diffusion of sulfur, thereby improving the cycle performance of the lithium-sulfur battery. Background technique [0002] The lithium-sulfur secondary battery system based on lithium metal negative electrode and sulfur elementary positive electrode is one of the combinations with the highest specific capacity and energy density in the known chemically reversible system. The theoretical specific capacity of the lithium-sulfur battery system is 1672mAh / g, the energy density is 2600Wh / kg and 2800Wh / L, and the average voltage is 2.1V. Compared with the theoretical energy density of lithium-ion batteries of 580Wh / kg and TNT equivalent of 128...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/058
CPCH01M4/139H01M4/362H01M4/62H01M10/058Y02E60/10Y02P70/50
Inventor 段连峰王俊凯岳凯强庄健吕威张霏霏郭曼盈张雨
Owner CHANGCHUN UNIV OF TECH
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