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

Abstract

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.

Calix[8]quinone: A new promising macrocyclic molecule as an efficient organic cathode in lithium ion batteries with a highly‐concentrated electrolyte

“…HCE has attracted widespread attention due to its high electrochemical window, outstanding safety and excellent rate performance, and so forth. Since there are no free solvent molecules in HCE, it can improve the cycle stability through effectively alleviating the dissolution of the organic cathode material in organic electrolyte 46 . Herein, the electrochemical performance of C8Q electrode in 4.2 M LiTFSI‐AN HCE is investigated, where the assembly of LIBs has no difference from above except for electrolyte.…”

Experimental study and optimization of excess lithium in cathodic active materials with Li x (Ni 0. 3 Mn 0 . 5 Co 0

“…6,7 From this perspective, research strategies in this field can be divided into the following six categories: Particle size reduction, 8,9 composite structure formation, 10,11 doping and structural modification, 12,13 morphology control, 14,15 coating and encapsulation, 16,17 and electrolyte modification. 18,19 Since the only charge transfer agent is lithium ions, theoretically, the best way to increase the capacity of batteries is to increase the number of ions in their structure. However, the limitation of cathodic active substances in accepting these ions is always the main factor in reducing the number of active ions.…”

“…The variety of characteristics and properties affecting the cathode material has led to different strategies to be used to improve the properties 6,7 . From this perspective, research strategies in this field can be divided into the following six categories: Particle size reduction, 8,9 composite structure formation, 10,11 doping and structural modification, 12,13 morphology control, 14,15 coating and encapsulation, 16,17 and electrolyte modification 18,19 …”

A Flame-Retardant and Insoluble Inorganic–Organic Hybrid Cathode Material Based on Polyphosphazene with Pyrene-Tetraone for Lithium Ion Batteries

“…10,11 However, besides all these advantages, organic electrode materials cause some problems in their use as electrodes because of their dissolution in common electrolytes and poor electrical conductivity. 12 The solubility of organic electrode materials in the electrolyte causes fast capacity fading, which thus diminishes battery lifetime. 13−15 To solve this problem, various techniques have been proposed, for instance, introducing ionic bonding, 16 more conductive additives or binder, 17 ionic liquids as electrolytes, 18 or polymerization approaches.…”

“…), resulting in diverse battery applications. − Generally, organic-based electrode materials are classified into four groups as conducting polymers, organosulfur compounds, organic free radical compounds, and organic carbonyl compounds. , Among these groups, organic carbonyl compounds (i.e., naphthalene diimide, perylene diimide, benzoquinone, anthraquinone, pyrene-tetraone, etc . ) stand out because of their lightweight, molecular varieties, and stability in redox reaction with fast kinetics. , However, besides all these advantages, organic electrode materials cause some problems in their use as electrodes because of their dissolution in common electrolytes and poor electrical conductivity . The solubility of organic electrode materials in the electrolyte causes fast capacity fading, which thus diminishes battery lifetime. − To solve this problem, various techniques have been proposed, for instance, introducing ionic bonding, more conductive additives or binder, ionic liquids as electrolytes, or polymerization approaches .…”