Abstract
Self-standing porous carbon electrodes mainly composed of mesopores with a three-dimensional hexagonal array exhibited superior lithium–oxygen battery performance under low electrolyte/areal capacity (E/C < 10 g A−1 h−1) conditions.
Highlights
Rechargeable lithium–oxygen batteries (LOBs) have attracted much attention because of their high theoretical energy density, which surpasses that of the lithium-ion batteries (LiBs).[1–5] a majority of the related studies utilize large electrolyte excesses and operate under small areal capacity conditions
We believe that the results obtained in this study show a new direction for the material design of porous carbon electrodes to realize LOBs with practically high energy density and long cycle life
The self-standing membranes were prepared by mixing porous carbon powders, carbon fibers, carbon nanotubes (CNTs), and polymeric materials
Summary
Rechargeable lithium–oxygen batteries (LOBs) have attracted much attention because of their high theoretical energy density, which surpasses that of the lithium-ion batteries (LiBs) (approximately 300 W h kgÀ1).[1–5] a majority of the related studies utilize large electrolyte excesses and operate under small areal capacity conditions. Most of the LOBs reported exhibited energy densities much lower than those of the LiBs, except for a few studies.[6]. A recent study revealed that the ratio of electrolyte weight to cell capacity (E/C, g AÀ1 hÀ1), used as an empirical parameter of the electrolyte amount in the LiB, well describes the energy density of the LOBs.[7–10]. The materials should be evaluated under low E/C conditions (o 10 g AÀ1 hÀ1) to accurately predict the performance of the LOBs with a practically high energy density. Based on this background, in the present study, we investigated the relationship between the physicochemical properties A recent study revealed that the ratio of electrolyte weight to cell capacity (E/C, g AÀ1 hÀ1), used as an empirical parameter of the electrolyte amount in the LiB, well describes the energy density of the LOBs.[7–10] the materials should be evaluated under low E/C conditions (o 10 g AÀ1 hÀ1) to accurately predict the performance of the LOBs with a practically high energy density.
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