A Versatile Halide Ester Enabling Li‐Anode Stability and a High Rate Capability in Lithium–Oxygen Batteries

Abstract

Li-O 2 batteries are promising candidates for nextgeneration high-energy-density battery systems.H owever,t he main problems of Li-O 2 batteries include the poor rate capability of the cathode and the instability of the Li anode. Herein, an ester-based liquid additive,2 ,2,2-trichloroethyl chloroformate,w as introduced into the conventional electrolyte of aL i-O 2 battery.V ersatile effects of this additive on the oxygen cathode and the Li metal anode became evident. The Li-O 2 battery showed an outstanding rate capability of 2005 mAh g À1 with ar emarkably decreased charge potential at alarge current density of 1000 mA g À1 .The positive effect of the halide ester on the rate capacity is associated with the improved solubility of Li 2 O 2 in the electrolyte and the increased diffusion rate of O 2 .Furthermore,the ester promotes the formation of as olid-electrolyte interphase layer on the surface of the Li metal, which restrains the loss and volume change of the Li electrode during stripping and plating, thereby achieving ac ycling stability over 900 ha nd aL ic apacity utilization of up to 10 mAh cm À2 . Angewandte ChemieCommunications 2357

Nonmacrocyclic Iron(II) Soluble Redox Mediators Leading to High-Rate Li–O 2 Battery

“…18,19 The capacity of Li-O 2 battery depends on the Li 2 O 2 uptake, accommodated by the porous cathode material, while the cycling stability correlates positively with the reversibility of the ORR and OER. 20,21 For the achievement of high capacity, sp 2 carbon materials with large specific surface area, suitable pore structure and high conductivity are the most commonly used cathodes. [22][23][24] For improving cycling stability, usually, two categories of electrocatalysts have been developed, that is, the heterogeneous catalysts decorated on carbon-based cathode [12][13][14][15][16][24][25][26] and the soluble redox mediators employed in electrolyte.…”

Wax‐Transferred Hydrophobic CVD Graphene Enables Water‐Resistant and Dendrite‐Free Lithium Anode toward Long Cycle Li–Air Battery

“…In virtue of the great passivation effect from the graphene coating, the cycling performance of the gLi‐100‖Ru@CNT cell demonstrated here is ranked among the best Li–air batteries reported today, and is even superior to many of the state‐of‐the‐art Li–O 2 batteries tested in pure oxygen (Figure 6d ). [ 2 , 4 , 7 , 9 , 12 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ] More absurdly here, to showcase the superb water tolerance of the gLi‐100 cell in operation, we immersed the as‐fabricated Li–air battery in water and found it can still light up an LED for a short period of time with the preperfused air (Figure 6e and Video S3 , Supporting Information).…”

Review and Recent Advances of Oxygen Transfer in Li‐air Batteries

“…Wang et al [112] . added the ester liquid additive 2,2,2‐trichloroethyl chloroformate into the conventional electrolyte of Li‐air battery and realized the multiple effects of this organic molecule on oxygen cathode and lithium metal anode.…”