Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Constructing Co3S4 Nanosheets Coating N‐Doped Carbon Nanofibers as Freestanding Sulfur Host for High‐Performance Lithium–Sulfur Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-11 , DOI: 10.1002/advs.202002037 Xuzi Zhang 1 , Chaoqun Shang 1 , Eser Metin Akinoglu 2 , Xin Wang 1, 2 , Guofu Zhou 1, 2
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-11 , DOI: 10.1002/advs.202002037 Xuzi Zhang 1 , Chaoqun Shang 1 , Eser Metin Akinoglu 2 , Xin Wang 1, 2 , Guofu Zhou 1, 2
Affiliation
|
Lithium–sulfur batteries (LSBs) have shown great potential as a rival for next generation batteries, for its relatively high theoretical capacity and eco‐friendly properties. Nevertheless, blocked by the shuttle effect of lithium polysulfides (LPSs, Li2S4‐Li2S8) and insulation of sulfur, LSBs show rapid capacity loss and cannot achieve the practical application. Herein, a composite of carbon nanofibers coated by Co3S4 nanosheets (denoted as CNF@Co3S4) is successfully synthesized as freestanding sulfur host to optimize the interaction with sulfur species. The combination of the two materials can lead extraordinary cycling and rate performance by alleviating the shuttle of LPSs effectively. N‐doped carbon nanofibers serve as long‐range conductive networks and Co3S4 nanosheets can accelerate the conversion of LPSs through its electrocatalytic and chemical adsorption ability. Benefiting from the unique structure, the transporting rate of Li+ can be enhanced. Distribution of Li+ is uniform for enough exposed negative active sites. As a result, the cell with CNF@Co3S4 as sulfur host is able to stabilize at 710 mA h g−1 at 1 C after 200 cycles with average coulombic efficiency of 97.8% in a sulfur loading of 1.7 mg cm−2 and deliver 4.1 mA h cm−2 at 0.1 C even in 6.8 mg cm−2 for 100 cycles.
中文翻译：
构建涂覆 N 掺杂碳纳米纤维的 Co3S4 纳米片作为高性能锂硫电池的独立硫主体
锂硫电池（LSB）因其相对较高的理论容量和环保特性而显示出作为下一代电池竞争对手的巨大潜力。然而，由于多硫化锂（LPS，Li 2 S 4 ‐Li 2 S 8）的穿梭效应和硫的绝缘性的阻碍，LSB表现出快速的容量损失，无法实现实际应用。在此，成功合成了涂覆有Co 3 S 4纳米片的碳纳米纤维复合材料（表示为CNF@Co 3 S 4）作为独立的硫主体，以优化与硫物质的相互作用。两种材料的结合可以通过有效减轻LPS的穿梭而带来非凡的循环和倍率性能。N掺杂碳纳米纤维作为长程导电网络，Co 3 S 4纳米片可以通过其电催化和化学吸附能力加速LPS的转化。得益于独特的结构，可以提高Li +的传输速率。对于足够多的暴露负极活性位点，Li +的分布是均匀的。结果，以CNF@Co 3 S 4作为硫主体的电池能够在200次循环后在1 C下稳定在710 mA hg -1 ，在硫负载量为1.7 mg cm -2时平均库仑效率为97.8 %即使在 6.8 mg cm -2下也能在 0.1 C 下提供 4.1 mA h cm -2 100 个循环。
更新日期：2020-11-19
中文翻译：
构建涂覆 N 掺杂碳纳米纤维的 Co3S4 纳米片作为高性能锂硫电池的独立硫主体
锂硫电池（LSB）因其相对较高的理论容量和环保特性而显示出作为下一代电池竞争对手的巨大潜力。然而，由于多硫化锂（LPS，Li 2 S 4 ‐Li 2 S 8）的穿梭效应和硫的绝缘性的阻碍，LSB表现出快速的容量损失，无法实现实际应用。在此，成功合成了涂覆有Co 3 S 4纳米片的碳纳米纤维复合材料（表示为CNF@Co 3 S 4）作为独立的硫主体，以优化与硫物质的相互作用。两种材料的结合可以通过有效减轻LPS的穿梭而带来非凡的循环和倍率性能。N掺杂碳纳米纤维作为长程导电网络，Co 3 S 4纳米片可以通过其电催化和化学吸附能力加速LPS的转化。得益于独特的结构，可以提高Li +的传输速率。对于足够多的暴露负极活性位点，Li +的分布是均匀的。结果，以CNF@Co 3 S 4作为硫主体的电池能够在200次循环后在1 C下稳定在710 mA hg -1 ，在硫负载量为1.7 mg cm -2时平均库仑效率为97.8 %即使在 6.8 mg cm -2下也能在 0.1 C 下提供 4.1 mA h cm -2 100 个循环。
京公网安备 11010802027423号