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Non-Flammable Ester Electrolyte with Boosted Stability Against Li for High-Performance Li metal Batteries

Journal Article


Abstract


  • In traditional non-flammable electrolytes a trade-off always exists between non-flammability and battery performance. Previous research focused on reducing free solvents and forming anion-derived solid-electrolyte interphase. However, the contribution of solvated anions in boosting the stability of electrolyte has been overlooked. Here, we resolve this via introducing anions into Li+ solvation sheaths using anions with similar Gutmann donor number (DN) to that of solvents. Taking trimethyl phosphate fire-retardant (DN=23.0 kcal mol���1) and NO3��� (DN=22.2 kcal mol���1) as an example, NO3��� is readily involved in the Li+ solvation sheath and reduces the polarity of solvent. This results in boosted stability of electrolyte against Li. The developed non-flammable electrolyte has low viscosity, high ionic conductivity and is low cost. The reversibility of Li-Cu cell was improved to 99.49 % and the lifespan of practical LMBs was extended by >100 %.

Publication Date


  • 2022

Citation


  • Wang, Z., Wang, Y., Li, B., Bouwer, J. C., Davey, K., Lu, J., & Guo, Z. (2022). Non-Flammable Ester Electrolyte with Boosted Stability Against Li for High-Performance Li metal Batteries. Angewandte Chemie - International Edition. doi:10.1002/anie.202206682

Scopus Eid


  • 2-s2.0-85137354513

Volume


Issue


Place Of Publication


Abstract


  • In traditional non-flammable electrolytes a trade-off always exists between non-flammability and battery performance. Previous research focused on reducing free solvents and forming anion-derived solid-electrolyte interphase. However, the contribution of solvated anions in boosting the stability of electrolyte has been overlooked. Here, we resolve this via introducing anions into Li+ solvation sheaths using anions with similar Gutmann donor number (DN) to that of solvents. Taking trimethyl phosphate fire-retardant (DN=23.0 kcal mol���1) and NO3��� (DN=22.2 kcal mol���1) as an example, NO3��� is readily involved in the Li+ solvation sheath and reduces the polarity of solvent. This results in boosted stability of electrolyte against Li. The developed non-flammable electrolyte has low viscosity, high ionic conductivity and is low cost. The reversibility of Li-Cu cell was improved to 99.49 % and the lifespan of practical LMBs was extended by >100 %.

Publication Date


  • 2022

Citation


  • Wang, Z., Wang, Y., Li, B., Bouwer, J. C., Davey, K., Lu, J., & Guo, Z. (2022). Non-Flammable Ester Electrolyte with Boosted Stability Against Li for High-Performance Li metal Batteries. Angewandte Chemie - International Edition. doi:10.1002/anie.202206682

Scopus Eid


  • 2-s2.0-85137354513

Volume


Issue


Place Of Publication