CAJ | 학술논문

采用CTAB为表面活性剂将氧化石墨烯和炭黑均匀分散,经水热过程将二者组装到一起,进而高温热处理得到石墨烯/炭黑杂化材料。该材料是一种具有独特结构和良好性能的石墨烯/炭黑杂化材料作为锂离子电池二元导电剂。炭黑颗粒均匀分布在石墨烯表面,可防止石墨烯片层团聚并进一步提高电子导电效率。由于炭黑可增加对电解液的吸附,促进电极内部锂离子的传输过程,最终提高锂离子电池的倍率性能。结果表明,使用质量分数5%900℃热处理之后的二元导电剂的LiFePO4,在10 C时比容量为73 mAh/g,优于使用10%炭黑导电剂时的LiFePO4(10 C比容量为62 mAh/g)。按照整个电极质量计算,前者的比容量性能比后者提高了近25%,同时在循环性能方面,前者的稳定性也优于后者。
채용CTAB위표면활성제장양화석묵희화탄흑균균분산,경수열과정장이자조장도일기,진이고온열처리득도석묵희/탄흑잡화재료。해재료시일충구유독특결구화량호성능적석묵희/탄흑잡화재료작위리리자전지이원도전제。탄흑과립균균분포재석묵희표면,가방지석묵희편층단취병진일보제고전자도전효솔。유우탄흑가증가대전해액적흡부,촉진전겁내부리리자적전수과정,최종제고리리자전지적배솔성능。결과표명,사용질량분수5%900℃열처리지후적이원도전제적LiFePO4,재10 C시비용량위73 mAh/g,우우사용10%탄흑도전제시적LiFePO4(10 C비용량위62 mAh/g)。안조정개전겁질량계산,전자적비용량성능비후자제고료근25%,동시재순배성능방면,전자적은정성야우우후자。
A novel graphene( GN)/carbon black( CB) binary conductive additive has been developed, which is characterized by a unique microstructure and excellent performance for lithium ion batteries ( LIBs) . It was fabricated using a hydrothermal process, followed by heat treatment. The introduction of CB particles prevents GN from agglomerating and hence improves the electronic conductivity of the resulting additive. CB particles can also enhance the Li+ ion diffusion, owing to a reduction of the GN fraction and an increase in electrolyte adsorption. Therefore, the rate performance of the LIB is improved to some extent. Experimental data shows that the specific capacity of LiFePO4 containing 5% of this binary conductive additive ( after 900 ℃ treatment) is 73 mAh/g at 10 C, which is superior to that of LiFePO4 with 10% of CB (62 mAh/g). Compared with the latter, the former has a specific capacity increase of 25% based on the mass of the whole electrode and shows superior cycle stability.