A cyclic phosphate-based battery electrolyte for high voltage and safe operation

Zheng, Qifeng; Yamada, Yuki; Shang, Rui; Ko, Seongjae; Lee, Yun-Yang; Kim, Kijae; Nakamura, Eiichi; Yamada, Atsuo

doi:10.1038/s41560-020-0567-z

Cited by 340 publications

(279 citation statements)

References 49 publications

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“…For organic electrolytes, not only salts as like ILs, but also solvents affect their properties. [176][177][178][179] The mostly used organic solvents are ACN and propylene carbonate (PC). ACN has higher dielectric constant and lower viscosity compared with PC.…”

Section: Non-aqueous Electrolytesmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

164

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Supercapacitors based on carbon materials have advantages such as high power density, fast charging/discharging capability, and long lifetime stability, playing a vital role in the field of electrochemical energy storage technologies. To further expand the practical applications of carbon-based supercapacitors, their energy density, which is essentially determined by the specific capacitance and operating voltage, should be improved. This review provides fundamental knowledge on achieving high energy density of supercapacitors. We first address the relationship of the features of carbon materials, such as the surface area, pore size distribution, and surface functional groups, with their electrochemical performances, such as the gravimetric and volumetric capacitance, surface pseudocapacitance, and operating voltage. Then, we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects, and present their effects on capacitance and operating voltage. Finally, we illustrate different cell design strategies and their basic principles for increasing operating voltage. We also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

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Section: Non-aqueous Electrolytesmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

164

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“…The N 1s, S 2p 3/2 , and O 1s spectra probably indicate the existence of amidyl radicals ● N(SO 2 F) 2 , –SO x – (probably SO 2 and Na[SO 2 F]), and C–N from the decomposition of the FSA − and C 3 C 1 pyrr + . [ 65–70 ] In addition, the C 1s peaks fitted at 284.4 eV, 285.4 eV, and 287.5 eV are assigned to C–C (C–H), C–O, and CO, respectively. [ 71 ] The characteristic peaks of the CF 2 group in PVDF are observed at 290.2 eV and 687.5 eV in C 1s and F 1s, respectively, whereas the CH 2 group is at 284.4 eV in C1s.…”

Section: Resultsmentioning

confidence: 99%

Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation

Hwang

Matsumoto

Hagiwara

2020

Advanced Energy Materials

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High power and energy density, long cyclability, and tolerance for wide temperature (seasonal and daily operational temperature differences) must be considered to construct large‐scale sodium secondary batteries. In this regard, Na3V2(PO4)2F3 (NVPF) has become a subject of interest as a high‐performance positive electrode material owing to its high energy density. However, the high operating voltage of NVPF causes continuous decomposition of electrolytes during cycles, resulting in significant capacity fading and low Coulombic efficiency. In this study, the electrochemical performance of the NVPF electrode in organic solvent electrolytes with and without additives and an ionic liquid is investigated at high voltage regimes over a wide temperature range (−20 °C to 90 °C). The results reveal that the performance of organic electrolytes is still insufficient even with additives, and the ionic liquid electrolyte demonstrates high electrochemical stability and cyclability with NVPF electrodes over a temperature range from −20 °C to 90 °C, achieving stable cycling over 500 cycles. The detailed electrochemical analysis combined with X‐ray photoelectron and energy dispersive X‐ray spectroscopy indicates that a sturdy cathode electrolyte interphase layer around the electrode protects it from capacity fading at high voltage and elevated temperature, resulting in high Coulombic efficiency.

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“…designed a novel solvent, 2‐(2,2,2‐trifluoroethoxy)‐1,3,2‐dioxaphospholane 2‐oxide (TFEP) for Li metal batteries (Figure 4e). [ 58 ] The 0.95 m LiFSI in TFEP/FEMC electrolyte not only displayed an electrochemical stability window of almost 5 V, but also showed non‐flammability with zero SET despite its slightly higher viscosity and lower conductivity compared with traditional electrolytes (Figure 4f). The TFEP‐based electrolyte was employed in a Li||NMC111 cell, which presented 86.5% capacity retention after 200 cycles.…”

Section: Non‐flammable Organic Liquid Electrolytesmentioning

confidence: 99%

Section: Phosphate Solvent-based Liquid Electrolytesmentioning

confidence: 99%

Non‐Flammable Liquid and Quasi‐Solid Electrolytes toward Highly‐Safe Alkali Metal‐Based Batteries

Jaumaux

Shanmukaraj

et al. 2020

Adv Funct Materials

172

133

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Rechargeable alkali metal (i.e., lithium, sodium, potassium)‐based batteries are considered as vital energy storage technologies in modern society. However, the traditional liquid electrolytes applied in alkali metal‐based batteries mainly consist of thermally unstable salts and highly flammable organic solvents, which trigger numerous accidents related to fire, explosion, and leakage of toxic chemicals. Therefore, exploring non‐flammable electrolytes is of paramount importance for achieving safe batteries. Although replacing traditional liquid electrolytes with all‐solid‐state electrolytes is the ultimate way to solve the above safety issues, developing non‐flammable liquid electrolytes can more directly fulfill the current needs considering the low ionic conductivities and inferior interfacial properties of existing all‐solid‐state electrolytes. Moreover, the electrolyte leakage concern can be further resolved by gelling non‐flammable liquid electrolytes to obtain quasi‐solid electrolytes. Herein, a comprehensive review of the latest progress in emerging non‐flammable liquid electrolytes, including non‐flammable organic liquid electrolytes, aqueous electrolytes, and deep eutectic solvent‐based electrolytes is provided, and systematically introduce their flame‐retardant mechanisms and electrochemical behaviors in alkali metal‐based batteries. Then, the gelation techniques for preparing quasi‐solid electrolytes are also summarized. Finally, the remaining challenges and future perspectives are presented. It is anticipated that this review will promote a safety improvement of alkali metal‐based batteries.

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A cyclic phosphate-based battery electrolyte for high voltage and safe operation

Cited by 340 publications

References 49 publications

Perspective on High‐Energy Carbon‐Based Supercapacitors

Perspective on High‐Energy Carbon‐Based Supercapacitors

Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation

Non‐Flammable Liquid and Quasi‐Solid Electrolytes toward Highly‐Safe Alkali Metal‐Based Batteries

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A cyclic phosphate-based battery electrolyte for high voltage and safe operation

Cited by 340 publications

References 49 publications

Perspective on High‐Energy Carbon‐Based Supercapacitors

Perspective on High‐Energy Carbon‐Based Supercapacitors

Electrolytes toward High‐Voltage Na3V2(PO4)2F3 Positive Electrode Durable against Temperature Variation

Non‐Flammable Liquid and Quasi‐Solid Electrolytes toward Highly‐Safe Alkali Metal‐Based Batteries

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Electrolytes toward High‐Voltage Na₃V₂(PO₄)₂F₃ Positive Electrode Durable against Temperature Variation