Stable cycling of small molecular organic electrode materials enabled by high concentration electrolytes

Cai, Taotao; Han, Yan; Lan, Qing; Wang, Feng; Chu, Jun; Zhan, Hui; Song, Zhiping

doi:10.1016/j.ensm.2020.06.032

Cited by 66 publications

(63 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA, C 24 H 8 O 6 , 98%, the commercial PTCDA are consistent with the crystal structure of PTCDA 54 as Supplementary Fig. S30 ), and Potassium (K, 99%) are provided by Aladdin Reagent and used as received without further purification.…”

Section: Methodsmentioning

confidence: 73%

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

et al. 2021

View full text Add to dashboard Cite

Potassium (K) metal is a promising alkali metal anode for its high abundance. However, dendrite on K anode is a serious problem which is even worse than Li. Artificial SEI (ASEI) is one of effective routes for suppressing dendrite. However, there are still some issues of the ASEI made by the traditional methods, e.g. weak adhesion, insufficient/uneven reaction, which deeply affects the ionic diffusion kinetics and the effect of inhibiting dendrites. Herein, through a unique self-catalysis tribo-electrochemistry reaction, a continuous and compact protective layer is successfully constructed on K metal anode in seconds. Such a continuous and compact protective layer can not only improve the K+ diffusion kinetics, but also strongly suppress K dendrite formation by its hard mechanical properties derived from rigid carbon system, as well as the improved K+ conductivity and lowered electronic conductivity from the amorphous KF. As a result, the potassium symmetric cells exhibit stable cycles last more than 1000 h, which is almost 500 times that of pristine K.

show abstract

Section: Methodsmentioning

confidence: 73%

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The increase may contribute from the deterioration of the contact between the active material and the conductive carbon during the repeated dissolution-redeposition process. 31,40 The impedance change of 4.2 M LiTFSA/AN system is smaller than that of 1 M LiPF 6 -EC/DMC within 100 cycles, which might be attributed to the improvement of the dissolution-redeposition process in the high concentration system, leading to the more outstanding performance.…”

Section: Electrochemical Performance Of P5q In 42 M Litfsa/anmentioning

confidence: 97%

“…It is well known that this behavior of increasing the electrolyte concentration is conducive to form solvated molecules and reduce the free solvent, so as to avoid the dissolution of organic electrode materials. 31 Based on the above discussion, in this research, we firstly applied 4.2 M LiTFSA/AN electrolyte to organic secondary batteries, where Pillar [5] quinone (P5Q) with a theoretical specific capacity of up to 446 mAh g À1 was employed as organic cathodes. We found that the as-combined organic battery displayed a splendid rate performance up to 10 C with a reversible capacity of 113 mAh g À1 .…”

Section: Introductionmentioning

confidence: 99%

Double‐effect of highly concentrated acetonitrile‐based electrolyte in organic lithium‐ion battery

Zhang

Sun

et al. 2021

EcoMat

View full text Add to dashboard Cite

Organic electrode materials have become a hot research field in lithium-ion batteries. However, the dissolution issue of organic materials (especially small molecules) in traditional electrolytes has become one of the important reasons to limit their application. The usage of highly concentrated electrolyte (HCE, >3 M) has been demonstrated to solve this problem, where the electrochemical performance of Pillar[5]quinone (P5Q) in 4.2 M LiTFSA/AN electrolyte was investigated. The HCE can avoid the reaction between acetonitrile molecules and lithium metal anode, reduce the dissolution of organic materials, and display excellent battery performance. At a current density of 0.2 C, a high specific capacity of 310 mAh g À1 (C theo = 446 mAh g À1 ) was maintained after 900 cycles, and the reversible capacity is higher than 113 mAh g À1 even at 10 C, indicating a good rate capability. This research would expand the new application of acetonitrile-based electrolyte in organic secondary battery.

show abstract

“…However, it was noticed that the solubility of 4,6DA1,3BQ was slightly Page 18 of 29 CCS Chemistry higher in carbonate ester electrolytes when compared to ether based electrolytes (Figure 5A and Figure 5C), which is probably due to the high polarities of both 4,6DA1,3BQ and carbonate ester. 53 The utilization of both LiPF 6 salt and carbonate ester solvents resulted in even higher solubility. Among the LiTFSI-based electrolytes with different solvents, the electrochemical performance of 4,6DA1,3BQ electrode again exhibited negative correlation with the solubility (Figure 5D), although another exception was also observed at low concentration (1 M LiTFSI in DME compared with 1 M LiTFSI in DME/DOL).…”

Section: Chemical States Of 46da13bq: Growth Control Of Crystalsmentioning

confidence: 99%

Diradicals or Zwitterions: The Chemical States of m -Benzoquinone and Structural Variation after Storage of Li Ions

Zhang

Fan

et al. 2022

CCS Chem

View full text Add to dashboard Cite

m-Benzoquinones are often regarded as unstable materials in the form of radicals. Herein, an air-stable small molecular m-benzoquinone (4,6-diamino-1,3-benzoquinone (4,6DA1,3BQ)) without bulky groups or large conjugated systems are reported and its chemical structure and state are profoundly elucidated by a series of substantial investigations, indicating the presence as zwitterions rather than diradicals. The deep study indicated that the m-benzoquinone structure of 4,6DA1,3BQ was stabilized through the combination of hydrogen bonding and electron delocalization. Due to the presence of hydrogen bonding and zwitterions, the solubility and electrochemical performance hence were strongly dependent on the intermolecular interactions between the materials and the electrolyte compositions (Li salt, solvent and concentration). The 4,6DA1,3BQ could undergo the reversible transformation from more zwitterion structures to more conjugated benzene nature after storage of Li ions. These results provide insights into the chemistry of 4,6DA1,3BQ and promote the further development of new materials of m-benzoquinone for various applications.

show abstract

Stable cycling of small molecular organic electrode materials enabled by high concentration electrolytes

Cited by 66 publications

References 51 publications

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

Tribo-electrochemistry induced artificial solid electrolyte interface by self-catalysis

Double‐effect of highly concentrated acetonitrile‐based electrolyte in organic lithium‐ion battery

Diradicals or Zwitterions: The Chemical States of m -Benzoquinone and Structural Variation after Storage of Li Ions

Contact Info

Product

Resources

About