Novel Concentrated Li[(FSO2)(n-C4F9SO2)N]-Based Ether Electrolyte for Superior Stability of Metallic Lithium Anode
Novel Concentrated Li[(FSO2)(n-C4F9SO2)N]-Based Ether Electrolyte for Superior Stability of Metallic Lithium Anode
复制标题
DOI：
10.1021/acsami.6b03857
复制
发表时间：
2017-02-08
影响因子：
9.5
通讯作者：
Chen, Liquan
中科院分区：
文献类型：
--
作者：
Fang, Zheng;Ma, Piang;Chen, Liquan
研究了（氟磺酰基）（n-壬基丁磺酰基）酰亚胺锂[LiRFSO 2）（n-C4 F9 SO2）N]（LiFNFSI）]作为导电盐在浓醚电解液中形成相对稳定的固体电解质界面膜对锂金属阳极的保护作用。与浓缩的双（三氟甲磺酰基）酰亚胺锂[Li[N（SO2 CF 3）（2）]（LiTFSI）]基电解质相比，具有浓缩的LiFNFSI基电解质的Li竖条Cu和Li竖条Li电池已被证明显示出金属锂阳极的高平均库仑效率（接近97%）和优异的循环稳定性（超过1,000小时）。利用扫描电子显微镜和X射线光电子能谱仪对锂-金属阳极表面的形貌和成分进行了对比分析。此外，本文还提出了用于LiL垂直条FePO 4电池的基于浓缩LiFNFSI的电解质的上级电化学性能。这些结果表明，浓缩的LiFNFSI基电解质是金属锂可充电电池的有前途的候选者。
Lithium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide [LiRFSO2)(n-C4F9SO2)N] (LiFNFSI)] is investigated as a conducting salt, which can form a relatively stable solid-electrolyte-interphase film in concentrated ether electrolyte to achieve favorable protection for lithium metal anodes. Li vertical bar Cu and Li vertical bar Li cells with concentrated LiFNFSI-based electrolyte have been demonstrated to display high average Coulombic efficiency (approximate to 97%) and excellent cycling stability (over 1,000 h) of metallic lithium anodes, compared to concentrated lithium bis(trifluoromethanesulfonyl)imide [Li[N(SO2CF3)(2)] (LiTFSI)]-based electrolyte. The morphologies and compositions of the lithium-metal anode surface are also comparatively analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Moreover, superior electrochemical performance in the concentrated LiFNFSI-based electrolyte for LiL vertical bar FePO4 cells is also presented herein. These results indicate that concentrated LiFNFSI-based electrolyte is a promising candidate for metallic lithium rechargeable batteries.