...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >Impact of Selected LiPF6 Hydrolysis Products on the High Voltage Stability of Lithium-Ion Battery Cells
【24h】

Impact of Selected LiPF6 Hydrolysis Products on the High Voltage Stability of Lithium-Ion Battery Cells

机译：LiPF6水解产物对锂离子电池单元高压稳定性的影响

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

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

摘要

Diverse LiPF6 hydrolysis products evolve during lithium-ion battery cell operation at elevated operation temperatures and high operation voltages. However, their impact on the formation and stability of the electrode/electrolyte interfaces is not yet investigated and understood. In this work, literature known hydrolysis products of LiPF6 dimethyl fluorophosphate (DMFP) and diethyl fluorophosphate (DEFP) were synthesized and characterized. The use of DMFP and DEFP as electrolyte additive in 1 M LiPF6 in EC:EMC (1:1, by wt) was investigated in LiNi1/3Mn1/3Co1/3O2/Li half cells. When charged to a cutoff potential of 4.6 V vs Li/Li+, the additive containing cells showed improved cycling stability, increased Coulombic efficiencies, and prolonged shelf life. Furthermore, low amounts (1 wt % in this study) of the aforementioned additives did not show any negative effect on the cycling stability of graphite/Li half cells. DMFP and DEFP are susceptible to oxidation and contribute to the formation of an effective cathode/electrolyte interphase as confirmed by means of electrochemical stability window determination, and X-ray photoelectron spectroscopy characterization of pristine and cycled electrodes, and they are supported by computational calculations.
机译：在升高的工作温度和较高的工作电压下，锂离子电池运行期间会产生多种LiPF6水解产物。然而，尚未研究和理解它们对电极/电解质界面的形成和稳定性的影响。在这项工作中，合成并表征了文献中已知的LiPF6二甲基氟磷酸盐（DMFP）和二乙基氟磷酸盐（DEFP）的水解产物。在LiNi1 / 3Mn1 / 3Co1 / 3O2 / Li半电池中研究了DMFP和DEFP作为EC：EMC中1 M LiPF6（1：1，wt）中的电解质添加剂的用途。当充电至Li / Li +的4.6 V截止电位时，含添加剂的电池显示出改善的循环稳定性，增加的库仑效率和延长的保存期限。此外，少量的上述添加剂（在本研究中为1 wt％）对石墨/锂半电池的循环稳定性未显示任何负面影响。 DMFP和DEFP易受氧化作用，并有助于形成有效的阴极/电解质中间相，如通过电化学稳定性窗口确定以及原始电极和循环电极的X射线光电子能谱表征所证实的那样，它们得到了计算计算的支持。

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