基于泡沫镍制备硫正极的研究

Research on the Preparation of Sulfur Cathode Based on the Nickel Foam

锂硫电池正极的制备通常包括硫载体材料的制备、硫载体材料覆硫制备硫正极复合材料、混浆料、涂片等工艺,制备工艺繁琐,且涂片时所用胶粘剂、导电碳会增加正极质量,减小了电池的比能量密度。为了解决上述问题,将氧化石墨烯与硫的混合物通过离心将其渗入泡沫镍孔隙中,经过还原氧化石墨烯后干燥得到硫复合材料。这种含泡沫镍的硫复合材料可直接用作硫正极,这种极片省去了胶粘剂、导电剂,也省去了混料、涂片等工艺,且载硫量可通过离心时间及次数来控制。此硫正极首次放电比容量可达1024.76mAh·g-1,循环50次后比容量为396.04mAh·g-1基于泡沫镍制备硫正极是一种简单有效的方法。

The preparation of lithium-sulfur battery cathodes usually includes the preparation of sulfur carrier materials, the preparation of sulfur cathode composite materials with sulfur and carrier materials and mixture slurry and coating, etc. The preparation process is complex, and the adhe-sive and conductive carbon used in the coating process increases the mass of the cathodes and reduces the specific energy density of the batteries. In order to solve the above problems, the graphene oxide and sulfur is mixed firstly, and then the sulfur/graphene oxide mixture is infiltrated into the pores of nickel foam by the centrifugation, and the sulfur composite materials can be obtained after reducing the graphene oxide and drying. This kind of sulfur composite which contains the nickel foam can be directly used as a sulfur cathode. And the cathode does not require adhesive and conduc-tive agents, and eliminates the processes of mixing and coating. The sulfur load can be controlled by centrifugation time and number of times. The first discharge specific capacity of this sulfur cathode can reach 1024.76 mAh·g-1, and the specific capacity is 396.04 mAh·g-1 after 50 cycles. The preparation of sulfur cathode based on nickel foam is a simple and effective method.