Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202009013
Keywords
additives; alkyl‐ triphenyl‐ phosphonium bromides; electrolytes; lithium metal batteries; metallic lithium anodes
Categories
Funding
- National Natural Science Foundation of China [11675051]
- Key Research and Development Program of Hunan Province of China [2018GK2031]
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The study designed alkyl-triphenyl-phosphonium bromides as electrolyte additives to enhance the stability of metallic Li anode under the guidance of multi-factor principle. The additives show positive influences on suppressing Li dendrite growth and stabilizing the unstable interphase between metallic Li anode/electrolyte.
Electrolyte additives play important roles in suppressing lithium dendrite growth and improving the electrochemical performance of long-life lithium metal batteries (LMBs), however, it is still challenging to design individual additive for adjusting the solid electrolyte interphase (SEI) components and changing lithium ion solvation sheath in the electrolyte at the same time for optimizing electrochemical performance. Herein, alkyl-triphenyl-phosphonium bromides (alkyl-TPPB) are designed as the electrolyte additive to enhance the stability of metallic Li anode under the guidance of multi-factor principle for electrolyte additive molecule design (EDMD). Both alkyl-TPP cations and Br- anions produce positive influences on suppressing Li dendrite growth and stabilizing the unstable interphase between metallic Li anode/electrolyte. As expected, the optimized solvation sheath structure, and the stable SEI suppress Li dendrite growth. As a result, the Li||Li4Ti5O12 cell reveals a long stable life over 1000 cycles with high Coulombic efficiency (99.9%). This work provides an insight on stabilizing SEI and optimizing solvation sheath structure with novel approach to develop long-term stability and safety LMBs.
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