Electrolyte Chemistry for Lithium-Ion Battery Performance

The electrolyte in a lithium-ion cell serves as the medium for Li-ion transport between electrodes, and its composition profoundly influences energy density, cycle life, rate capability and safety. Typical formulations combine a lithium salt, most often LiPF₆, with a blend of organic carbonates that balance ionic conductivity, viscosity and electrochemical stability. During initial cycles, electrolyte components decompose at electrode surfaces to form passivation films—the solid electrolyte interphase (SEI) on the anode and the cathode electrolyte interphase (CEI) on the cathode. A robust SEI suppresses continuous parasitic reactions while permitting rapid Li-ion diffusion; the CEI mitigates transition‐metal dissolution and oxidative degradation. Additives at concentrations below 5 wt % tailor interphase chemistry: film-forming species such as fluoroethylene carbonate and vinylene carbonate yield thinner, more ion-conductive SEIs, while fluorinated or silylated molecules can impart mechanical flexibility to accommodate electrode volume changes. Recent advances encompass rational molecular design of next-generation additives, mechanistic studies of decomposition pathways under operating conditions, and computational or AI-driven screening to accelerate discovery. Together, these efforts aim to optimise interphase architecture for high-energy-density cells, fast-charging protocols and enhanced safety under abuse conditions.

Research from Nature Portfolio

Next-generation synthetic additives based on dioxolone derivatives have been designed to form a highly stable interphase on both Si-embedded anodes and Ni-rich cathodes. These fluorinated and silylated molecules polymerise at the electrode surface, creating ion channels that accommodate large volume changes and protect against transition-metal dissolution. Cells incorporating these additives demonstrate over 80 % capacity retention after 400 cycles at 1 C, with minimal fading under fast‐charge conditions, highlighting the synergistic effect of molecular retrosynthesis in electrolyte engineering.

Electrolyte Chemistry for Lithium-Ion Battery Performance publication trend

The graph below shows the total number of articles in electrolyte chemistry for lithium-ion battery performance across all publications each year (not limited to Nature Index journals).

Technical terms

Electrolyte: A mixture of lithium salt and organic solvents that conducts Li ions between electrodes.

Solid Electrolyte Interphase (SEI): A passivation layer at the anode formed by electrolyte decomposition, essential for stabilising cycling.

Cathode Electrolyte Interphase (CEI): A protective film on the cathode that limits oxidative degradation and metal dissolution.

LiPF₆: Lithium hexafluorophosphate, the most common lithium salt providing high conductivity and adequate stability.

Fluoroethylene Carbonate (FEC): A film-forming additive that yields LiF-rich SEIs, enhancing interphase mechanical strength.

Vinylene Carbonate (VC): A cyclic carbonate additive that polymerises in the SEI to improve ion transport and limit side reactions.

References

1. Operando GC/MS for the investigation of different decomposition pathways during solid electrolyte interphase (SEI) formation with SEI forming additives. Journal of Power Sources (2024).
2. Replacing conventional battery electrolyte additives with dioxolone derivatives for high-energy-density lithium-ion batteries. Nature Communications (2021).
3. Sulfur‐containing compounds as electrolyte additives for lithium‐ion batteries. InfoMat (2021).
4. Research progress of fluorine-containing electrolyte additives for lithium ion batteries. Journal of Power Sources Advances (2021).
5. Understanding the Role of Prop-1-ene-1,3-Sultone and Vinylene Carbonate in LiNi1/3Mn1/3Co1/3O2/Graphite Pouch Cells: Electrochemical, GC-MS and XPS Analysis. Journal of The Electrochemical Society (2015).