Multi-redox phenazine/non-oxidized graphene/cellulose nanohybrids as ultrathick cathodes for high-energy organic batteries

Ham, Youngjin; Ri, Vitalii; Kim, Jin; Yoon, Yeoheung; Lee, Jinho; Kang, Kisuk; An, Ki‐Seok; Kim, Chunjoong; Jeon, Seungwon

doi:10.1007/s12274-020-3187-9

Cited by 27 publications

(18 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, electrolytes with highly concentrated active materials are usually thermodynamically unstable which may cause phase separation or salt precipitation. An alternative route to increase the charge storage capacity of the redox-active electrolyte without the undesired viscosity increase could be achieved by enabling the multi-electron transfer [63][64][65][66][67][68][69] . Kang and coworkers 63 first developed a 5,10-dihydro-5,10-dimethyl phenazine (DMPZ) catholyte, which exhibited a stable two-electron transfer at −0.15 and 0.61 V vs. Ag/Ag + .…”

Section: Achieving Reversible Multi-electron Transfermentioning

confidence: 99%

Strategies to Improve the Energy Density of Non-Aqueous Organic Redox Flow Batteries

Cong¹,

Lu²

2021

Acta Physico Chimica Sinica

View full text Add to dashboard Cite

Redox flow batteries (RFBs) have been widely recognized as the primary choice for large-scale energy storage due to their high energy efficiency, low cost, and versatile design of decoupled energy storage and power output. However, the broad deployment of RFBs in the power grid has long been plagued by the high cost and low energy density of existing inorganic metal-based electrodes. Redox-active organic molecules (ROMs), on the other hand, have recently been extensively explored as the potentials electrodes in RFBs for their potential low cost, abundant resources, and highly tunable structure. The energy density of RFBs is proportional to the number of electrons transferred per unit reaction, the concentration of active materials, and the cell voltage. Therefore, strategies to improve the energy density of RFBs could be categorized into three classes: (1) expanding the cell voltage;(2) maximizing the practical concentration of active materials; (3) realizing multi-redox process. Benefited by the highly tunable structure and properties of ROMs, the cell voltage of RFBs could be realized by lowering the redox potentials of anolytes or/and increasing the redox potentials of catholytes. To fully exploit the low-potential anolytes and high-potential catholytes, non-aqueous electrolytes with wider electrochemical potential windows (EPWs) are preferred over the aqueous systems. However, the solubility of most ROMs in commonly used non-aqueous electrolytes is very limited. Several effective strategies to improve the practical concentrations of ROMs have been proposed: (1) the solubility of ROMs could be easily tailored by adjusting the intermolecular interactions between ROMs and the interactions between ROMs and electrolytes via molecular engineering; (2) the redox-active eutectic systems remain liquid at or near room temperature, allowing us to reduce or completely remove the inactive solvent used in the conventional electrolyte of RFBs, which leads to an enhanced practical concentration of the redox-active components; (3) the semi-solid suspension achieves a high practical concentration of ROMs by combining the advantages of solid ROMs with high energy density and liquid electrolytes with flowability; (4) the redox-targeting approach breaks the solubility limitation by realizing remote charge exchange between the solid active materials deposited in the tanks and the current collectors of the electrochemical stacks via ROMs dissolved in electrolytes. The first three strategies employ a homogeneous flowing redox-active fluid which suffers from deteriorated physical and electrochemical properties as the practical concentration of ROMs increase, e.g., high viscosity, phase separation, and salt precipitation. The redox-targeting approach uses a hybrid flowing liquid/static solid system, which avoids the aforementioned unfavorable changes in electrolyte properties, however, this design introduces additional chemical reactions between the ROMs and the solid active materials, which may reduce the power output. Another effici...

show abstract

Section: Achieving Reversible Multi-electron Transfermentioning

confidence: 99%

Strategies to Improve the Energy Density of Non-Aqueous Organic Redox Flow Batteries

Cong¹,

Lu²

2021

Acta Physico Chimica Sinica

View full text Add to dashboard Cite

show abstract

“…Various small molecules and polymers have been reported as electrodes for rechargeable LIBs. [13][14][15] Small molecule materials are limited by the solubility in electrolyte and have to be treated with salification and electrolyte optimization, such as high concentration electrolytes 16 and ionic liquid electrolytes, 17,18 which finally increase the cost of LIBs. The conventional polymer materials often suffer from low utilization of the active groups due to the dense packing of the molecule chains and the aggregation of the polymer particles, which may also result in the inactivation of the active sites and the capacity degradation of the assembled batteries.…”

Section: Introductionmentioning

confidence: 99%

A star-shaped polyimide covalent organic framework for high-voltage lithium-ion batteries

Hao

Chen

et al. 2022

Mater. Chem. Front.

View full text Add to dashboard Cite

show abstract

“…16,17 Various DHP derivatives have been recently studied as OCMs for EESDs as well as catholytes for redox flow batteries and overcharge protection additives for lithium batteries. [17][18][19][20][21][22][23][24][25][26][27][28] Recently, we reported a novel DHP-derived polymer, poly(5-methyl-10-(4-vinylbenzyl)-phenazine) (PVBPZ) with notable cathode material properties for lithium-ion batteries (LIBs). 14 However, the electrochemical stability of PVBPZ is rather low under high working potentials, disabling the utilization of its second redox reaction, which possibly originates from the electrochemically unstable methylene group in the benzyl moiety.…”

mentioning

confidence: 99%

Ultrastable dihydrophenazine-based polymer from industrial waste as a sustainable lithium-ion battery cathode material

et al. 2022

View full text Add to dashboard Cite

show abstract

Multi-redox phenazine/non-oxidized graphene/cellulose nanohybrids as ultrathick cathodes for high-energy organic batteries

Cited by 27 publications

References 54 publications

Strategies to Improve the Energy Density of Non-Aqueous Organic Redox Flow Batteries

Strategies to Improve the Energy Density of Non-Aqueous Organic Redox Flow Batteries

A star-shaped polyimide covalent organic framework for high-voltage lithium-ion batteries

Ultrastable dihydrophenazine-based polymer from industrial waste as a sustainable lithium-ion battery cathode material

Contact Info

Product

Resources

About