Interface Engineering with Nonsacrificial Perfluorinated-Anion Additives for Boosting the Kinetics of Lithium-Ion Batteries

Abstract

Though lithium-ion batteries (LIBs) have seen a meteoric rise in worldwide deployment over the last decade, they should be further advanced in constant demand of higher rate capability and wider temperature adaptability. A solid electrolyte interphase (SEI) is the essential part of LIBs, determining the charge−discharge performance and degradation behavior. Herein, improvement of the SEI properties is achieved by regulating the electrochemical double layer structure with a nonsacrificial electrolyte additive, that is, lithium nonafluoro-1-butanesulfonate. The anion adsorption of the additive affects the decomposition behavior of other additive and solvent species, and the generated SEI at the graphite electrode becomes thinner and more uniform, leading to decreased impedance and finally resulting in improved energy efficiency, power capability, and fast charging performance of the graphite/NCM811 cell. Furthermore, the low-temperature cycleability at −20 °C is considerably enhanced with no dendritic Li metal deposition at the negative electrode surface. A mechanistic study on the interfacial phenomena and the effect is carried out by using various theoretical and experimental methods, such as density functional theory calculations, electrochemical quartz crystal microbalance, and transmission electron microscopy. Consequently, the approach of SEI modification with the nonsacrificial electrolyte additive can be one of the effective ways to advance LIB technology in future.

Interfacial Chemistry of Perfluorinated-Anion Additives Deciphering Ether-Based Electrolytes for Sodium-Ion Batteries

“…By contrast, the SPFO-containing system has typical reversible peaks (Figure 2b), which is attributed to the pseudocapacitance generated by the reversible adsorption/desorption of SPFO. 29,30 Similar adsorption/desorption behaviors are observed in SHFO-containing and SPFP-containing systems (Figure S10).…”

Rapid in situ growth of high-entropy oxide nanoparticles with reversible spinel structures for efficient Li storage

“…54 On the other hand, this indicates that nanomaterials have a larger electric double layer effect area, which is similar to a supercapacitor and therefore evidently conducive to high-rate charge and discharge. 55 In addition, the LFNM-CuZn electrode shows the lowest R ct value of 17.8 Ω. This indicated the best charge transfer property at the electrode interface among all the as-prepared samples.…”

Reinforcement of Positive Electrode‐Electrolyte Interface without Using Electrolyte Additives Through Thermoelectrochemical Oxidation of LiPF6 for Lithium Secondary Batteries

“…(Figure S8, Supporting Information) The rate performance test demonstrates that the rate performance of Li/NCM cell remains unchanged as a consequence of the formation process change, however, the typical inclusion of the vinylene carbonate additive lowers the cell performance. Since thick SEI and surface film deposition from sacrificial‐type electrolyte additives generally impair power performances, [ 11 ] changing the formation protocol holds great promise for increasing cyclability. To verify the universality of the formation protocol modification, the Li/LiCoO 2 (LCO) cell is also evaluated.…”