Replacing conventional battery electrolyte additives with dioxolone derivatives for high-energy-density lithium-ion batteries

• Published in: Nature communications Vol. 12; no. 1; p. 838
• Main Authors: Park, Sewon, Jeong, Seo Yeong, Lee, Tae Kyung, Park, Min Woo, Lim, Hyeong Yong, Sung, Jaekyung, Cho, Jaephil, Kwak, Sang Kyu, Hong, Sung You, Choi, Nam-Soon
• Format: Journal Article
• Language: English
• Published: England Nature Publishing Group 05.02.2021; Nature Publishing Group UK; Nature Portfolio
• Subjects: Additives; Anodes; Anodic protection; Batteries; Cathodes; Cathodic protection; Density; Electrolytes; Energy; Formability; Interphase; Ion channels; Ion transport; Life span; Lithium; Lithium-ion batteries; Propagation (polymerization); Rechargeable batteries; Silicon; Solid electrolytes
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-021-21106-6

Solid electrolyte interphases generated using electrolyte additives are key for anode-electrolyte interactions and for enhancing the lithium-ion battery lifespan. Classical solid electrolyte interphase additives, such as vinylene carbonate and fluoroethylene carbonate, have limited potential for simultaneously achieving a long lifespan and fast chargeability in high-energy-density lithium-ion batteries (LIBs). Here we report a next-generation synthetic additive approach that allows to form a highly stable electrode-electrolyte interface architecture from fluorinated and silylated electrolyte additives; it endures the lithiation-induced volume expansion of Si-embedded anodes and provides ion channels for facile Li-ion transport while protecting the Ni-rich LiNi Co Mn O cathodes. The retrosynthetically designed solid electrolyte interphase-forming additives, 5-methyl-4-((trifluoromethoxy)methyl)-1,3-dioxol-2-one and 5-methyl-4-((trimethylsilyloxy)methyl)-1,3-dioxol-2-one, provide spatial flexibility to the vinylene carbonate-derived solid electrolyte interphase via polymeric propagation with the vinyl group of vinylene carbonate. The interface architecture from the synthesized vinylene carbonate-type additive enables high-energy-density LIBs with 81.5% capacity retention after 400 cycles at 1 C and fast charging capability (1.9% capacity fading after 100 cycles at 3 C).