CAJ | 학술논문

随着高科技电子产品的不断发展,电池扮演着越来越重要的角色,同时,人们也越来越注重电池的性能。由于锂离子电池理论比容量有限,难以满足目前对更高能量密度的需求,而硫电极理论比容量可高达1675 mAh/g,以硫与金属锂构建的锂/硫二次电池体系的理论能量密度达2600 Wh/kg,远大于现阶段所使用的商业化二次电池。采用微波法成功制备了硫/膨胀石墨复合材料,通过控制微波时间可实现对硫含量的控制。对材料进行了扫描电镜、热重和X射线衍射等研究,结果表明,复合材料中确实存在硫,且在同一比例时,随着微波时间的延长,硫含量逐渐减少。电化学研究结果表明,在0.5 min时,材料具有最好的电化学性能,首次放电容量达650 mAh/g。
수착고과기전자산품적불단발전,전지분연착월래월중요적각색,동시,인문야월래월주중전지적성능。유우리리자전지이론비용량유한,난이만족목전대경고능량밀도적수구,이류전겁이론비용량가고체1675 mAh/g,이류여금속리구건적리/류이차전지체계적이론능량밀도체2600 Wh/kg,원대우현계단소사용적상업화이차전지。채용미파법성공제비료류/팽창석묵복합재료,통과공제미파시간가실현대류함량적공제。대재료진행료소묘전경、열중화X사선연사등연구,결과표명,복합재료중학실존재류,차재동일비례시,수착미파시간적연장,류함량축점감소。전화학연구결과표명,재0.5 min시,재료구유최호적전화학성능,수차방전용량체650 mAh/g。
With the coming out of high-tech electronic products,batteries have been playing an increasingly important role,at the same time,people are increasingly focused on battery performance.Due to the theoretical specific capacity is limited,lithium-ion batteries is difficult to meet today's demand for higher energy density.The sulfur electrode theoretical specific capacity of up to 1 675 mAh/g,lithium/sulfur battery system which is consisted of sulfur and metal lithium theoret-ical energy density is 2 600 Wh/kg,much larger than the commercialized secondary batteries now.In the paper,successful-ly prepared the sulfur/expanded graphite,and could control the load of sulfur by controlling the microwave time.A series of studies by SEM、TG、XRD for composites showed that the sulfur dose exist in the composites,and the load decreased follow-ing the adding of microwave time at the same ratio.The electrochemical results showed that the composites with 30s micro-wave time have best electrochemical performances,the first discharge capacity is 650 mAh/g.