Specializing liquid electrolytes and carbon-based materials in EDLCs for low-temperature applications

Hung, Pui-yan; Zhang, Huihui; Lin, Han; Guo, Qiaoshi; Lau, Kin-tak; Jia, Baohua

doi:10.1016/j.jechem.2021.12.012

Cited by 22 publications

(3 citation statements)

References 153 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To achieve sustainable utilization of energy, humans have developed a range of energy storage devices, including lithium–sulfur batteries, − aqueous zinc-ion batteries, , lithium–selenium batteries, , lithium-ion batteries, , and supercapacitors. , Among these, lithium-ion batteries are the most widely used; however, their sustainability is challenged due to the limited global lithium resources. In comparison, electrochemical double-layer capacitors (EDLCs) in supercapacitors have advantages such as long cycle life, high power density, and fast charging and discharging capability, making them a highly promising alternative energy storage device. , The electrochemical performance of EDLCs is primarily determined by the electrode material used. The electrode materials for supercapacitors can be classified into three categories: carbon materials, conductive polymers, and metal oxides/hydroxides. , Among these categories, carbon-based materials have been extensively studied and widely used in the industrialization of batteries and capacitors.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison, electrochemical double-layer capacitors (EDLCs) in supercapacitors have advantages such as long cycle life, high power density, and fast charging and discharging capability, making them a highly promising alternative energy storage device. 12,13 The electrochemical performance of EDLCs is primarily determined by the electrode material used. The electrode materials for supercapacitors can be classified into three categories: carbon materials, conductive polymers, and metal oxides/hydroxides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Why Can Phosphorus-Doped Nanopores Improve the Capacitance of Electrochemical Double-Layer Capacitors Using Alkaline Electrolytes? A First-Principles Study

Zhang,

Hao,

Tang

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

To investigate how phosphorus-doped carbon micropores can significantly enhance the capacitance of electrochemical double-layer capacitors (EDLCs), we performed first-principles calculations on phosphorus-doped monolayer (MGP) and bilayer graphene (BGP-x, x = 4–8), simulating macropores or mesopores and micropores, respectively. In addition, we studied the stable structure, relative capacitance, and reaction characteristics of Na+, Li+, and their hydrated ion structures {[Na(H2O) n ]+, [Li(H2O) n ]+, n = 1–4} on MGP, as well as their insertion behavior in BGP-x. Surprisingly, we observed a desolvation phenomenon within the phosphorus-doped carbon micropores. The calculation results suggest that the adsorption of [Na(H2O)4]+ and [Li(H2O)4]+ on MGP is primarily attributed to the stronger OH–π interaction compared to the Na+–π and Li+–π interactions. On the other hand, the stability of the structure after embedding [Na(H2O) n ]+ and [Li(H2O) n ]+ in BGP-x can be explained by the opposite scenario. The equilibrium between these two interactions and the continuous reduction in interlayer spacing facilitate the desolvation of [Na(H2O) n ]+ and [Li(H2O) n ]+. A decrease in the number of water molecules bound to Na+ and Li+ ions leads to a maximum increase in relative capacitance of 2.7 and 3.0 times, respectively. This indicates that desolvation can significantly enhance the capacitance of EDLCs. The complete desolvation size for Na+ is less than 4 Å, while for Li+, it is 4.3 Å. Based on these calculations, when using phosphorus-doped carbon materials as electrode materials, selecting an electrolyte containing Li+ rather than Na+ would result in a higher capacitance. The calculation results reveal the mysterious mechanism behind the significant increase in capacitance caused by phosphorus-doped carbon micropores. In addition to this, they also provide us with a magical key to optimize the perfect combination of electrolyte composition and carbon material pore size/type.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Why Can Phosphorus-Doped Nanopores Improve the Capacitance of Electrochemical Double-Layer Capacitors Using Alkaline Electrolytes? A First-Principles Study

Zhang,

Hao,

Tang

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Recent reviews continue to highlight promising strategies for IL eutectic systems, [27][28][29] salts dissolved in molecular solvents, [30][31][32] and design of IL/ molecular liquid mixtures for a variety of electrochemical applications down to −40 to −70 °C. 33,34 For IL/ML electrolyte systems, popular solvent candidates such as carbonates, 35,36 carboxylates, 37 gamma-butyrolactone (GBL), 36,[38][39][40] and acetonitrile (ACN) serve as an attractive option to obtain tailored physicochemical properties over a broad temperature range.…”

Section: Introductionmentioning

confidence: 99%