CAJ | 학술논문

采用超声波辅助溶胶-凝胶法合成层状的锂离子电池的正极材料LiNi_(0.5)Mn_(0.5)O_2,并用热重分析、X射线衍射(XRD)、扫描电子显微镜(SEM)对材料的结构与形貌进行了研究,电化学性能采用循环伏安法(CV)、交流阻抗和充放电测试进行表征.结果表明,在950℃灼烧12 h的材料结晶度比较好,其晶胞参数a=0,287 9 nm,c=1.431 nm,结构比较理想.当材料在2.8～4.2 V间进行充放电时,其首次放电容量为170 mAh/g,50次循环后容量的保持率为89%.
채용초성파보조용효-응효법합성층상적리리자전지적정겁재료LiNi_(0.5)Mn_(0.5)O_2,병용열중분석、X사선연사(XRD)、소묘전자현미경(SEM)대재료적결구여형모진행료연구,전화학성능채용순배복안법(CV)、교류조항화충방전측시진행표정.결과표명,재950℃작소12 h적재료결정도비교호,기정포삼수a=0,287 9 nm,c=1.431 nm,결구비교이상.당재료재2.8～4.2 V간진행충방전시,기수차방전용량위170 mAh/g,50차순배후용량적보지솔위89%.
The cathode material LiNi_(0.5)Mn_(0.5)O_2 is prepared by the ultrasonic assisted sol-gel method. Structure, appearance and electrochemical performance of the material were characterized by TG, XRD, SEM and electrochemical tests. The results indicate that the material of heat treatment of 950 ℃ in 12 h presents good crystallinity with lattice parameters of a=0.287 9 nm, c=1.431 nm. Initial discharge capacity of 170 mAn/g was obtained in the range 2.8～4.2 V. 89% of the initial discharge capacity was reserved after 50 cycles.