Stable Anion-Derived Solid Electrolyte Interphase in Lithium Metal Batteries.
High-energy-density lithium (Li) metal batteries are severely hindered by the dendritic Li deposition dictated by non-uniform solid electrolyte interphase (SEI). Despite its unique advantages in improving the uniformity of Li deposition, the current anion-derived SEI is unsatisfactory under practical conditions. Herein regulating the electrolyte structure of anions by anion receptors was proposed to construct stable anion-derived SEI. Tris(pentafluorophenyl)borane (TPFPB) anion acceptors with electron-deficient boron atoms interact with bis(fluorosulfonyl)imide anions (FSI- ) and decrease the reduction stability of FSI- . Furthermore, the type of aggregate cluster of FSI- in electrolyte changes, FSI- interacting with more Li ions in the presence of TPFPB. Therefore, the decomposition of FSI- to form Li2 S is promoted, improving the stability of anion-derived SEI. In working Li | LiNi0.5 Co0.2 Mn0.3 O2 batteries under practical conditions, the anion-derived SEI with TPFPB undergoes 194 cycles compared with 98 cycles of routine anion-derived SEI. This work inspires a fresh ground to construct stable anion-derived SEI by manipulating the electrolyte structure of anions.
['Li|Tao|T|http://orcid.org/0000-0003-0283-4933', 'Zhang|Xue-Qiang|XQ|http://orcid.org/0000-0003-2856-1881', 'Yao|Nan|N|http://orcid.org/0000-0003-1965-2917', 'Yao|Yu-Xing|YX|http://orcid.org/0000-0001-6350-1206', 'Hou|Li-Peng|LP|http://orcid.org/0000-0002-9147-525X', 'Chen|Xiang|X|http://orcid.org/0000-0002-7686-6308', 'Zhou|Ming-Yue|MY|http://orcid.org/0000-0001-9843-1439', 'Huang|Jia-Qi|JQ|http://orcid.org/0000-0001-7394-9186', 'Zhang|Qiang|Q|http://orcid.org/0000-0002-3929-1541']
anion-derived solid electrolyte interphase lithium metal batteries electrolyte structure anion receptor tris(pentafluorophenyl) borane