摘要:
以氯化钴为钴源，硫脲为硫源，柠檬酸为碳源，冷冻干燥后，采用熔盐法在不同的温度进行退火处理得到Co9S8与C的复合物 CS (CS-600,CS-700,CS-800,CS-900)。系统地探讨了不同的退火温度对产物的晶体结构、形貌及电化学性能的影响。结果发现：和纯Co9S8样品相比，碳复合的Co9S8样品的循环性能与倍率性能得到了较大的提升。在煅烧温度为700°C时，所合成的样品CS-700具有最高的比容量与最好的循环性能，在100mA·g−1充放电循环100次后，放电比容量可以达到898.6 mAh·g−1，可作为锂离子电池负极材料的潜在选择。
关键词: 负极材料；熔盐法；Co9S8；碳复合；锂离子电池
Abstract: Taking cobalt chloride as the cobalt source, thiourea as the sulfur source, and citric acid as the carbon source, after freezing and drying, the compounds CS (CS-600,CS-700,CS-800,CS-900) of Co9S8 and Carbon are obtained by annealing the molten salts at different temperatures. The papers discusses effects of different annealing temperatures on the crystal structure, morphology and electrochemical properties of the products in a systematical manner. It is found that the cycle and rate properties of the Co9S8-carbon compound samples are much higher than those of pure Co9S8 samples. At the calcination temperature of 700 °C, the synthesized sample CS-700 has the highest specific capacity and the best cycle performance, and its discharge specific capacity can reach 898.6 mAh·g−1 after 100 charge/discharge cycles at 100 mA·g−1. This means that it can be used as a potential anode material for lithium-ion batteries.
Keywords: anode materials; molten salt method; Co9S8; carbon compound; lithium ion battery
关键词: 负极材料；熔盐法；Co9S8；碳复合；锂离子电池
Abstract: Taking cobalt chloride as the cobalt source, thiourea as the sulfur source, and citric acid as the carbon source, after freezing and drying, the compounds CS (CS-600,CS-700,CS-800,CS-900) of Co9S8 and Carbon are obtained by annealing the molten salts at different temperatures. The papers discusses effects of different annealing temperatures on the crystal structure, morphology and electrochemical properties of the products in a systematical manner. It is found that the cycle and rate properties of the Co9S8-carbon compound samples are much higher than those of pure Co9S8 samples. At the calcination temperature of 700 °C, the synthesized sample CS-700 has the highest specific capacity and the best cycle performance, and its discharge specific capacity can reach 898.6 mAh·g−1 after 100 charge/discharge cycles at 100 mA·g−1. This means that it can be used as a potential anode material for lithium-ion batteries.
Keywords: anode materials; molten salt method; Co9S8; carbon compound; lithium ion battery