CAJ | 학술논문

用流变相的方法合成了非整比锂锰尖晶石(Li1.1Mn2.1O4+y).用XRD、XPS、ICP技术对其结构和组成进行了确定;用透射电镜方法观测晶体颗粒的大小和形状.并对其电化学性质进行了研究,结果表明:该化合物作为正极材料,与整比尖晶石化合物相比,具有优良的可充电性能,初始放电容量为126mAh/g(充、放电电流密度为1mA/cm2,电压范围为4.4～3.0V),当锂片为负极时,电池进行充放电循环60次,容量衰减很少,经100次循环后,容量为117mAh/g,仅衰减7%.这一独特的性质使该化合物成为有潜力的正极材料.这一新颖的合成方法为无机材料合成提供了有效可行的途径.
용류변상적방법합성료비정비리맹첨정석(Li1.1Mn2.1O4+y).용XRD、XPS、ICP기술대기결구화조성진행료학정;용투사전경방법관측정체과립적대소화형상.병대기전화학성질진행료연구,결과표명:해화합물작위정겁재료,여정비첨정석화합물상비,구유우량적가충전성능,초시방전용량위126mAh/g(충、방전전류밀도위1mA/cm2,전압범위위4.4～3.0V),당리편위부겁시,전지진행충방전순배60차,용량쇠감흔소,경100차순배후,용량위117mAh/g,부쇠감7%.저일독특적성질사해화합물성위유잠력적정겁재료.저일신영적합성방법위무궤재료합성제공료유효가행적도경.
A nonstoichiometric spinel phase (Li1.1Mn2.1O4+y) was synthesized using reheological phase reaction method. It was characterized by XRD and XPS techniques. The particle size and shape of the expected compounds were observed by transmission electron microscopy technique. The composition of new spinel phase was checked by ICP. The electrochemical properties of the spinel phase (Li1.1Mn2.1O4+y) were also investigated. The results showed that the Li1.1Mn2.1O4+y behaved excellent recharge ability to compare with stoichiometric LiMn2O4. The initial discharge capacity of the battery was 126mAh/g when current density was 1mA/cm2 over voltage range of 4.4 to 3.0V. It dropped slowly during 60 cycles. After 100 cycles, the discharge capacity was retained at 117mAh/g (about 93% of initial discharge capacity) when the metallic lithium was the anode. The outstanding electrochemical properties of Li1.1Mn2.1O4+y make it possible to be used as a promising cathode material. The novel synthesis method provides a simple and effective route for inorganic material synthesis.