Sulfur-carbon composite positive electrode material for lithium-sulfur battery and preparation method of sulfur-carbon composite positive electrode material

A technology of carbon composite materials and lithium-sulfur batteries, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of high electrochemical active discharge specific capacity, poor cycle performance, and low conductivity, and achieve Improve the utilization rate of active materials, improve the cycle stability, and the effect of high specific capacity

Active Publication Date: 2015-05-06
SHANDONG YUHUANG NEW ENERGY TECH +1
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AI Technical Summary

Problems solved by technology

[0006] The invention overcomes the problems of low conductivity and poor cycle performance in the existing lithium-sulfur battery system, and provides a sulfur-carbon composite positive electrode material for lithium-sulfur batteries and a preparation method thereof. The material is a high electrochemical activity, Sulfur-carbon composites with high discharge specific capacity

Method used

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  • Sulfur-carbon composite positive electrode material for lithium-sulfur battery and preparation method of sulfur-carbon composite positive electrode material
  • Sulfur-carbon composite positive electrode material for lithium-sulfur battery and preparation method of sulfur-carbon composite positive electrode material
  • Sulfur-carbon composite positive electrode material for lithium-sulfur battery and preparation method of sulfur-carbon composite positive electrode material

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Embodiment 1

[0035] 1. Disperse 0.1 g of conductive carbon black BP2000 in 27 ml of deionized water and 3 ml of absolute ethanol and ultrasonically disperse at room temperature for 1 h to form a solution with a concentration of 3.3 g / L. Then 32 wt.% sodium polysulfide (Na 2 S 4 ) solution 1.2g continued to ultrasonically disperse for 30 min. After the dispersion was complete, the mixed solution was stirred on a magnetic stirrer at a constant temperature of 60°C until it was dry (it took 5 hours). Transfer to a mortar and grind into powder to get Na 2 S 4 / CCB mixed powder.

[0036] 2. Put the mixed powder in a zirconia ball mill jar, add NMP (N-methylpyrrolidone) as a solvent, add HCOOH as a reactant, wet ball mill at a milling speed of 230 rpm for 12 h, and vacuum dry at 60 °C The sulfur / carbon composites were obtained by drying in medium temperature for more than 12 h.

[0037] 3. Transfer the prepared sulfur-carbon composite material to a polytetrafluoroethylene reactor filled with...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is the reaction acid selected for preparing the sulfur-carbon composite cathode material in step 2. The specific preparation method is as follows:

[0040] Na prepared in step 1 2 S 4 / CCB mixed powder was placed in a zirconia ball mill jar, NMP (N-methylpyrrolidone) was added as a solvent, and HCl was added as a reactant, wet ball milled at a milling speed of 230 rpm for 12 h, and placed in a vacuum oven at 60 °C Dry for more than 12 h to obtain sulfur / carbon composites.

[0041] Other steps are identical with embodiment 1. The positive electrode composite material in the present invention is obtained, coded as S2, and the sulfur content in the positive electrode composite material is 65%.

Embodiment 3

[0043] The difference between this embodiment and Example 1 is the reaction acid selected for preparing the sulfur-carbon composite cathode material in step 2. The specific preparation method is as follows:

[0044] Na prepared in step 1 2 S 4 / CCB mixed powder is placed in a zirconia ball mill jar, NMP (N-methylpyrrolidone) is added as a solvent, and NaH 2 PO 4 As a reactant, the sulfur / carbon composite material was obtained by wet ball milling at a ball milling speed of 230 rpm for 12 h, and dried in a vacuum oven at 60 °C for more than 12 h. The sulfur content in the positive electrode composite material was 65%.

[0045] Other steps are identical with embodiment 1. The positive electrode composite material in the present invention was obtained, coded as S3.

[0046] Three kinds of sulfur-carbon composite positive electrode materials S1, S2, S3 prepared by embodiment 1, embodiment 2, embodiment 3 are the cycle life figure measured under the current density of 160 mA / g ...

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Abstract

The invention particularly relates to a preparation method of a sulfur-carbon composite positive electrode material for a lithium-sulfur battery. Sodium polysulfide is taken as the raw material, and the nano-scale sulfur particles generated by use of a chemical reaction are promoted to be melted by virtue of high-speed ball milling and go into carbon pores of conductive carbon black, and finally, the sulfur-carbon composite positive electrode material is prepared. The high-performance sulfur-carbon composite material is prepared by use of an in-situ wet ball milling method. According to the preparation method, the operation is simple and easy, the energy consumption is low, the cost is low, an environment-friendly effect is achieved, and the industrial production is easy. The thorough dispersion and fixation of sulfur on a conductive substrate are realized; besides, a high-concentration lithium salt electrolyte is adopted to inhibit the solution of polysulfide, and therefore, the cyclic stability and the active substance utilization rate of the material are improved. As a result, the sulfur-carbon composite material prepared by use of the in-situ wet ball milling method is a positive electrode material which is high in specific capacity, long in cycle life and high in rate performance and can be applied to the field of lithium secondary batteries.

Description

(1) Technical field [0001] The invention relates to a preparation method of a high-energy-density positive electrode material for a lithium secondary battery, in particular to a sulfur-carbon composite positive electrode material for a lithium-sulfur battery and a preparation method thereof. (2) Background technology [0002] Facing the rapid development of new energy technologies, especially the potential market demand in the field of mobile communications and electric vehicles, the task of developing secondary batteries with higher energy density is very urgent. Among them, lithium-sulfur batteries have very obvious advantages in terms of energy density. Compared with other traditional battery systems, sulfur has a high theoretical specific energy of 2800 Wh / kg, and the energy density of lithium-sulfur batteries in practical applications may exceed 300 Wh. / kg. In addition, sulfur resources are abundant, the cost is low, and the sulfur electrode material has less environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/13H01M4/139H01M4/1393
CPCH01M4/133H01M4/1393H01M4/362H01M10/052Y02E60/10
Inventor 王文阁宋春华王瑛乔文灿赵成龙陈欣王新鹏冯涛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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