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Effective incorporation of nitrogen and boron in worm-like carbon foam for confining polysulfides

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Abstract Flexible electrode materials toward rational design and low-cost fabrication are crucial to energy storage applications. Herein, a three-dimensional (3D) flexible N, B co-doped carbon foam (NBC) is developed, enabling… Click to show full abstract

Abstract Flexible electrode materials toward rational design and low-cost fabrication are crucial to energy storage applications. Herein, a three-dimensional (3D) flexible N, B co-doped carbon foam (NBC) is developed, enabling efficient polysulfides confinement. N, B co-doping is employed to overcome the conflict between heteroatom doping and stability of carbon lattice, because one B and one N atoms are isoelectronic to two C atoms. B atoms in such a carbon structure possess positive charge which can interact with Sn2− anions in forming Sn2− … B while N atoms form negative charge which construct a strong-couple interaction with Li+ cations in forming N⋯Li2Sn. Moreover, the fabrication approach of corresponding flexible 3D carbon form is extremely facile derived from the self-gelation of agar. When used as the host for S, such a 3D carbon foam provides a continuous conductive structure, accommodates the volume change during long-term cycling and serves as a barrier for polysulfides dissolution. As a result, cycling performance of high sulfur loading (5.8 mg cm−2) NBC-S electrode exhibits high areal capacity of 5.6 mA h cm−2 (965 mA h g−1) with a very small capacity decay of 0.03% per cycle over 350 cycles at 0.2 C.

Keywords: effective incorporation; carbon; nitrogen boron; incorporation nitrogen; carbon foam

Journal Title: Carbon
Year Published: 2019

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