CAJ | 학술논문

结合磷酸铁锂纳米化,并利用碳纳米管良好的导电性和大长径比等优良特性,采用喷雾干燥方法制备出碳纳米管原位复合磷酸铁锂正极材料。碳纳米管在材料合成过程中均匀分散在活性物质中,形成连续贯通的三维导电网络,这种结构可显著提高磷酸铁锂正极材料的电子导电性和锂离子的扩散速率。所得材料具有良好的大电流放电特性,在50 C 充放电时,比容量达到99 mAh/ g；同时该材料也具有优异的循环性能,在10 C 大电流充放电的情况下,450次循环后容量保持率仍大于90%。
결합린산철리납미화,병이용탄납미관량호적도전성화대장경비등우량특성,채용분무간조방법제비출탄납미관원위복합린산철리정겁재료。탄납미관재재료합성과정중균균분산재활성물질중,형성련속관통적삼유도전망락,저충결구가현저제고린산철리정겁재료적전자도전성화리리자적확산속솔。소득재료구유량호적대전류방전특성,재50 C 충방전시,비용량체도99 mAh/ g；동시해재료야구유우이적순배성능,재10 C 대전류충방전적정황하,450차순배후용량보지솔잉대우90%。
A hybrid cathode material for high rate lithium ion batteries was prepared by ball-milling and spray-drying a slurry con-taining LiFePO 4 nanoparticles, glucose and carbon nanotubes (CNTs) in water, followed by pyrolysis at 600 ℃ for 6 h under a gas mixture of 5% H2 in Ar. CNTs with a large aspect ratio form a continuous conductive network connecting the LiFePO4 nanoparticles and amorphous carbon, which significantly reduces the electrical resistance of the cathode. The hybrid material can deliver a specific capacity of 99 mAh/ g at a 50 C charge/ discharge rate. An excellent cycling performance was also demonstrated, with a capacity loss of less than 10% after 450 cycles at a 10 C rate.