Dual-cation electrolytes for low H2 gas generation in Li4Ti5O12//AC hybrid capacitor system

Chikaoka, Yu; Iwama, Etsuro; Seto, Shinichi; Okuno, Yuta; Shirane, Tomohide; Ueda, Tsukasa; Naoi, Wako; Reid, McMahon Thomas Homer; Naoi, Katsuhiko

doi:10.1016/j.electacta.2020.137619

Cited by 9 publications

(18 citation statements)

References 25 publications

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“…Moreover, it demonstrates perfect endurance in the environment containing HF contamination relative to LiPF 6 and LiBF 4 . [67,90] Dual-salt electrolytes were also widely applied to improve electrochemical performance and suppress the parasitic reaction between electrode materials and electrolytes, and the well-known combinations include lithium difluoro(oxalato)borate (LiDFOB)/LiBF 4 , [12a] LiPF 6 /LiBF 4 , [87] spiro(1,1')-bipyrrolidinium tetrafluoroborate (SBPBF 4 )/LiBF 4 , [91] LiTFSI/LiDFOB, [92] lithium trifluoro(perfluoro-tert-butyloxyl) borate (LiTFPFB)/LiTFSI, [93] et al Additive occupies only a small amount to other components, but makes great contribution on forming protective layer on the electrode surface, which enables the separation of electrode materials and the surrounding electrolyte to suppress the irreversible electrolyte decomposition. [58b,94] Plenty of literatures have done on additives and demonstrated excellent effects on gas suppression of electrolytes.…”

Section: Sei Layer Constructionmentioning

confidence: 99%

Revealing Lithium Battery Gas Generation for Safer Practical Applications

Liu

Yang

Xiao

et al. 2022

Adv Funct Materials

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Gases generated from lithium batteries are detrimental to their electrochemical performances, especially under the unguarded runaway conditions, which tend to contribute the sudden gases accumulation (including flammable gases), resulting in safety issues such as explosion and combustion. The comprehensive understanding of battery gas evolution mechanism under different conditions is extremely important, which is conducive to realizing a visual cognition about the complex reaction processes between electrodes and electrolytes, and providing effective strategies to optimize battery performances. This review aims to summarize the recent progress about battery gas evolution mechanism and highlight the gas suppression strategies to improve battery safety. New approaches toward future gas evolution analysis and suppression are also proposed. It is anticipated that this review will inspire further developments of lithium batteries on performance, gas suppression, and safety, especially in high energy density systems.

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Section: Sei Layer Constructionmentioning

confidence: 99%

Revealing Lithium Battery Gas Generation for Safer Practical Applications

Liu

Yang

Xiao

et al. 2022

Adv Funct Materials

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“…For controlling the problems of low efficiency and increased cost of DC converters, a capacitor has been proposed, which is capable of the qualities of more than two devices. As compared to the old one, hybrid capacitors have unique capacitance [ 142 ]. This is the blend of batteries and capacitors features, with overall increased potential, power densities, and energy densities.…”

Section: Electrical Energy Storage Classificationmentioning

confidence: 99%

Review on Comparison of Different Energy Storage Technologies Used in Micro-Energy Harvesting, WSNs, Low-Cost Microelectronic Devices: Challenges and Recommendations

Riaz

Sarker

Saad

et al. 2021

Sensors

141

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This paper reviews energy storage systems, in general, and for specific applications in low-cost micro-energy harvesting (MEH) systems, low-cost microelectronic devices, and wireless sensor networks (WSNs). With the development of electronic gadgets, low-cost microelectronic devices and WSNs, the need for an efficient, light and reliable energy storage device is increased. The current energy storage systems (ESS) have the disadvantages of self-discharging, energy density, life cycles, and cost. The ambient energy resources are the best option as an energy source, but the main challenge in harvesting energy from ambient sources is the instability of the source of energy. Due to the explosion of lithium batteries in many cases, and the pros associated with them, the design of an efficient device, which is more reliable and efficient than conventional batteries, is important. This review paper focused on the issues of the reliability and performance of electrical ESS, and, especially, discussed the technical challenges and suggested solutions for ESS (batteries, supercapacitors, and for a hybrid combination of supercapacitors and batteries) in detail. Nowadays, the main market of batteries is WSNs, but in the last decade, the world’s attention has turned toward supercapacitors as a good alternative of batteries. The main advantages of supercapacitors are their light weight, volume, greater life cycle, turbo charging/discharging, high energy density and power density, low cost, easy maintenance, and no pollution. This study reviews supercapacitors as a better alternative of batteries in low-cost electronic devices, WSNs, and MEH systems.

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“…[16] Then, the amount of gas evolution strongly depends on the material(s) used, in this case, the surface functionalities of the AC that act as catalytic sites or decompose themselves. [21,51] In this context, the formation of H 2 , CO 2 , and CO originates from the catalytic decomposition of carbon in contact with a dual-cation electrolyte [39,40] (i.e., lithium tetrafluoroborate LiBF 4 /SPBF 4 in PC) or an aqueous lithium sulfate electrolyte [39] have been previously described. For the dual-cation electrolyte, H 2 stems from the excessive reduction of the negative electrode (lithium titanate oxide), whereas CO and CO 2 are byproducts of oxidation at the positive electrode (AC).…”

Section: In Situ Gas Pressure Measurements Of the Ac-based Symmetric ...mentioning

confidence: 99%

Comparative Internal Pressure Evolution at Interfaces of Activated Carbon for Supercapacitors Containing Electrolytes Based on Linear and Cyclic Ammonium Tetrafluoroborate Salts in Acetonitrile

Nikiforidis

Phadke

Anouti

2022

Adv Materials Inter

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EDLC), where the prevalent mechanism entails non-Faradaic charge storage at the interface between a high surface area material and a liquid electrolyte. These energy storage devices are intriguing due to their high power density (10 kW kg −1 ), rapid response time (1 s), cycle-life (10 5 cycles) and safety. [1] Nanoporous carbon materials are commonly used in EDLCs. Their porous structures act as a bulk buffering reservoir for any medium, curtailing the ion transport resistance to the interior surface of the pores. [2] Increased pore accessibility caters to a larger number of cations to populate the electrode's double layer, leading to specific capacitances of the order of 200 F g −1 , as is for the case of activated carbon. [3] The latter is widely used in these energy storage devices as it is inexpensive, i.e., the carbonization process originates from wood, coal, and nutshell and is easily prepared compared with other porous materials such as templated carbons and carbide-derived carbons. With a specific surface area of ≈2000 m 2 g −1 , it can provide ≈30 mAh g −1 V −1 counter to 150 mAh g −1 V −1 for standard battery electrodes. [4,5] Typically, the electrochemical window of EDLCs is lower than that of batteries (e.g., 4.3 V for nickel manganese oxidegraphite battery). Thus, as the energy stored is proportional to the square root of the voltage (E EDLC = ½ C × V 2 ; C denotes capacitance and V voltage), their energy density is hindered, i.e., E LIB = 3-30 × E EDLC . It should be noted that E EDLC hinges on the nature of the double layer, that is, the specific Helmholtz compact layer geometry, the size of electrolyte cations and anions, their degree of solvation, and the orientation of the electrolyte solvent dipoles in the imposed electric field. [6] Accordingly, organic electrolytes are an attractive choice as they can reach operating voltages as high as 3.5 V. Acetonitrile (ACN) is a representative dipolar aprotic solvent that boasts operating temperatures at sub-zero range (T melting ACN = −45 °C), fluidity (η = 0.345 mPa s −1 at 25 °C), a large operating voltage window (>3.0 V), [7] low internal resistance, facile ionic adsorption within the pores of carbon-based electrodes and electrochemical stability due to its low viscosity and high dielectric constant (e = 38) In this study, the real-time increase in pressure of the accumulated gases at the electrode/electrolyte interface serves as a safety criterion for four conductive electrolytes comprising acetonitrile (ACN) and organic salts. They include tetrafluoroborate as an anion and cyclic 1,1-dimethylpyrrolidinium (Pyr11 + ), spiro-(1,1′)-bipyrrolidinium (SBP + ), acyclic methyl triethyl ammonium (Et 3 MeN + ) or standard tetraethylammonium (Et 4 N + ) as cations. The main focus lies on the SPBF 4 /ACN system. While the concentrated Pyr11BF 4 /ACN exhibits a minimal pressure evolution (≈25 Pa) under ambient conditions at 3.0 V, its electrochemical stability is inferior to SPBF 4 at high operating voltage. The electrolytes with acyclic tetrafluoroborate s...

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Dual-cation electrolytes for low H2 gas generation in Li4Ti5O12//AC hybrid capacitor system

Cited by 9 publications

References 25 publications

Revealing Lithium Battery Gas Generation for Safer Practical Applications

Revealing Lithium Battery Gas Generation for Safer Practical Applications

Review on Comparison of Different Energy Storage Technologies Used in Micro-Energy Harvesting, WSNs, Low-Cost Microelectronic Devices: Challenges and Recommendations

Comparative Internal Pressure Evolution at Interfaces of Activated Carbon for Supercapacitors Containing Electrolytes Based on Linear and Cyclic Ammonium Tetrafluoroborate Salts in Acetonitrile

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