The room temperature fluorine ion battery designed by Shanghai Silicate Salvic acid salt 2023-12-21 Source: Municipal Science and Technology Commission Font

 人参与 | 时间:2024-02-13 13:04:40

Multi -electron transfer reactions are important ways to design high -energy density batteries, and converted fluorite batteries rely on the multi -price metal fluoride multi -electronic reactions and its high reaction potential, which can theoretically achieve ultra -high volume energy density.For liquid electrolyte fluorite batteries, according to technical and economic analysis, its battery stack model based on specific electrodes can achieve the energy density of 588 WH/KG (1393 WH/L). At the same timeThe cost of energy density can be as low as 20 $/kWh.However, the theoretical energy density advantage of fluorine ion batteries has not yet been realized in experiments, especially under low temperature (<100 ℃) or even room temperature conditions.Sexic electrolyte.Although liquid electrolytes are relatively solid and electrolytes, and better moisture to electrodes, the main challenges are that the strong crystal grid between cations and fluorine ions can easily cause fluorine salt in conventional intangible subdler solventIt is difficult to be solvectized or even insoluble.The anionic receptor (AA) can weaken fluorine salt lattice energy to a certain extent through Louis acid and alkali.However, the conventional boron -based AA due to the strong Louis acidity of boron can effectively promote the dissolution of fluorine salt, it also makes it difficult for fluoride ions to take off the solvents to participate in the electrode reaction, resulting in poor electrochemical properties of fluorine ion batteries (such as cycle stability (such as cycle stabilityability, Reaction dynamics, etc.).

In response to the above problems, Li Chilin, a researcher at the Shanghai Silicate Research Institute of the Chinese Academy of Sciences, designed a room temperature fluorine battery electrolyte based on non-boron-based yin ion receptors (TG) and pyrine-like solvents.The conductivity can be as high as 2.40 ms/cm, which is at the highest level in non -water fluoride electrolytes.By regulating the fluorine concentration, it can optimize the fluorine conduction performance of the positive electrolyte interface (CEI), and inhibit the irreversible loss of the active substance, so that the corresponding fluoride battery can realize the reversible cycle at room temperature.Related research results are published on the title of "Materials Horizons" in the title of Room-Temperature Reversible F-agteries Based on Sulfone Electrolytes With

The work first prepared electrolytes with different fluoride concentrations at room temperature.Through the analysis of the nuclear magnetic resonance spectrum and infrared spectrum of different electrolytes, the tg molecule has promoted the dissolution of fluorine salt in the intangible sub -solventy solvent (DMSO) dissolving (DMSO) solubility;The narrowing and blue motion phenomenon, combined with the calculation of adsorption effects, indicates that the hydrogen of the TG molecular aimazole ring-NH-is the role of TG on fluoride ions, and this effect is weakerIt is more conducive to the migration and dissolution of fluoride ions.Based on this series of electrolytes, at the same time, CUF2 and PB are full battery room temperature fluorine ion with positive and negative assembly. At the current density of 50 mA/G, the initial discharge capacity can reach up to 381 mA H/g.There is a reversible capacity of 126 MA H/G, and the polarization voltage can be as low as 0.36 V.Further represent the evolution of the positive and negative phases, the researchers found that the orthopedic dewick response occurred in the positive pole during the discharge process.2(Positive Elast)+PB (negative pole) → Cu+PBF2, The charging process is the opposite, indicating CU (orthodox)+PBF2(Negative pole) → CUF2+PB.

However, the electrolyte formula with the highest ion conductivity is not the best formula of fluoride battery performance, which indicates that the nature of the interface layer derived from different formula electrolytes is also an important factor affecting the performance of fluorine ion battery.Through the analysis of the CEI composition, the study found that the electrolyte (CTD3) with the best battery performance has enhanced the electrochemical stability of the electrolyte due to its appropriate high-salt concentration, reducing the depth reduction of sulfur in the electrolyte into S2-, and the depth of the electrolyte.Avoid S2-CU2+/PB2+Capture reduces the loss of active substances. At the same time, CEI of CTD3 contains more fluoride (PBF2), which enhances the fluoride transmission capacity of the interface, thereby increasing the reversibility and reaction dynamics of the battery.This work provides new types and formulas for electrolyte design of fluoride ion batteries, and reveals the important impact of derivative electrode-electrolyte interface characteristics on fluorite battery performance.

Related research work is supported by the National Natural Science Foundation of China and the Shanghai Science and Technology Council.

备 Preparation and structural characteristics of 备

Preparation and structural representation of 备

Infrared spectral characteristics and component interaction of electrolyte .PNG

Infrared spectral characteristics and component interaction of electrolytes

Electrolytic ionic conductivity and corresponding fluorine ion battery performance.png

Electrolytic ionic conductivity and corresponding fluorine ion battery performance

PB negative electrode and CUF2 positive electrode evolution .PNG

The loop phases of PB negative and CUF2 positive electrode evolving

The composition evolution of the CEI CEI of the orthopedic electrolyte interface .PNG

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