Abstract
SummaryIn contrast to enormous progresses in electrode active materials, little attention has been paid to electrode sheets despite their crucial influence on practical battery performances. Here, as a facile strategy to address this issue, we demonstrate nanofibrous conductive electrode binders based on deoxyribonucleic acid (DNA)-wrapped single-walled carbon nanotubes (SWCNT) (denoted as DNA@SWCNT). DNA@SWCNT binder allows the removal of conventional polymeric binders and carbon powder additives in electrodes. As a proof of concept, high-capacity overlithiated layered oxide (OLO) is chosen as a model electrode active material. Driven by nanofibrous structure and DNA-mediated chemical functionalities, the DNA@SWCNT binder enables improvements in the redox reaction kinetics, adhesion with metallic foil current collectors, and chelation of heavy metal ions dissolved from OLO. The resulting OLO cathode exhibits a fast charging capability (relative capacity ratio after 15 min [versus 10 h] of charging = 83%), long cyclability (capacity retention = 98% after 700 cycles), and thermal stability.
Highlights
Despite their successful commercialization in various application fields, lithium-ion batteries (LIBs) have still faced challenges in terms of the energy density, fast charging, long-term sustainability, and safety (Liu et al, 2019; Schmuch et al, 2018)
SUMMARY In contrast to enormous progresses in electrode active materials, little attention has been paid to electrode sheets despite their crucial influence on practical battery performances
As a facile strategy to address this issue, we demonstrate nanofibrous conductive electrode binders based on deoxyribonucleic acid (DNA)-wrapped single-walled carbon nanotubes (SWCNT)
Summary
Despite their successful commercialization in various application fields, lithium-ion batteries (LIBs) have still faced challenges in terms of the energy density, fast charging, long-term sustainability, and safety (Liu et al, 2019; Schmuch et al, 2018). Conventional electrode sheets consist of electrode active materials, polymeric binders, and carbon conductive powders on top of metallic foil current collectors. This electrode architecture has limitations in providing well-interconnected ion/electron pathways that are essentially secured for reliable redox reactions, which become more serious in the high-mass loading/high-thickness electrodes that are recently spotlighted for realizing high-energy density batteries (Tang et al, 2015; Wang et al, 2019). The insufficient adhesion between the electrode components and current collectors is another concern in electrode sheet development (Yuan et al, 2018; Bresser et al, 2018)
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