• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Electrochemical Science >Effect of Calcination Time on Lithium Ion Diffusion Coefficient of LiMg0.04Mn1.96O4 Prepared by a Solid-State Combustion Method
【24h】

Effect of Calcination Time on Lithium Ion Diffusion Coefficient of LiMg0.04Mn1.96O4 Prepared by a Solid-State Combustion Method

机译：煅烧时间对固态燃烧法制备的LiMg 0.04 Mn 1.96 O 4 锂离子扩散系数的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A series of LiMg0.04Mn1.96O4 cathode materials were prepared by a solid-state combustion method at temperature of 500°C for 1h and then calcined at 700°C for 3, 6, 9 and 12h. The effects of two-stage calcination time on structure, morphology, electrochemical properties and diffusion coefficient of lithium ions of LiMg0.04Mn1.96O4 were studied. X-ray diffraction (XRD) results showed that the two- stage calcination time at 700°C is ineffective to change crystalline structure and phase composition, still retaining intrinsic spinel structure without any other impurity phases, but the crystallinity become well and particle size increases with calcination time increases. Scanning electron microscope (SEM) shows that LiMg0.04Mn1.96O4 calcined at 700°C for 6h (LMMO-6h) has uniform, nearly octahedron + structure morphology with narrow size distribution. Diffusion coefficient of lithium ions ( DLi ) of LiMg0.04Mn1.96O4 two-stage calcined at 700°C for 3-12 hours was calculated according to the charging + peaks in cyclic voltammetric (CV) curves, it was found that the DLi value first increases and then slightly decreased with the calcined time at 700°C. The highest value of 7.19×10-11 and 7.48×10-11 cm2 s-1 for the first and second oxidation peaks of LMMO-6h, respectively. The electrochemical tests also show LMMO-6h exhibited a better electrochemical than other samples.
机译：通过固态燃烧法在500℃的温度下制备一系列LiMg0.04Mn1.96O4阴极材料，时间为1h，然后在700℃下煅烧3、6、9和12h。研究了两阶段煅烧时间对LiMg0.04Mn1.96O4锂离子的结构，形貌，电化学性能和扩散系数的影响。 X射线衍射（XRD）结果表明，在700°C的两级煅烧时间不能有效地改变晶体结构和相组成，仍保留了固有的尖晶石结构，而没有任何其他杂质相，但是结晶度变得很好并且粒径增大随着煅烧时间的增加。扫描电子显微镜（SEM）显示，在700°C下煅烧6h（LMMO-6h）的LiMg0.04Mn1.96O4具有均匀的，接近八面体的结构形态，尺寸分布狭窄。根据循环伏安法（CV）曲线中的电荷+峰，计算出在700°C下煅烧了两阶段的LiMg0.04Mn1.96O4锂离子（DLi）的扩散系数，发现其DLi值为在700°C下煅烧时间先增加然后略有减少。 LMMO-6h的第一个和第二个氧化峰的最高值为7.19×10-11和7.48×10-11 cm2 s-1。电化学测试还表明，LMMO-6h的电化学性能优于其他样品。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号