Renewable Polysulfide Regulation by Versatile Films toward High-Loading Lithium–Sulfur Batteries,ACS Applied Materials & Interfaces

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Renewable Polysulfide Regulation by Versatile Films toward High-Loading Lithium–Sulfur Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-29 , DOI: 10.1021/acsami.0c14476
Pengfei Wang ₁ , Zihan Shen ₁ , Chao Xia ₁ , Kezhong Lv ₁ , Huigang Zhang ₁ , Ping He ₁ , Haoshen Zhou _{1,

2}

Affiliation

The development of a high specific energy lithium–sulfur battery is heavily hindered by the so-called “shuttle effect”. Nevertheless, as an effective strategy, most modified separators cannot block and reuse polysulfides simultaneously. Here, a unique and versatile film fabricated by nitrogen and phosphorus co-doped carbon nanofibers uniformly anchored with TiC nanoparticles is incorporated between the separator and cathode of the lithium–sulfur battery. The battery armed with this functional film exhibits a high capacity of 737.1 mA h g^–1 at 5 C with a slow capacity-fading rate of 0.06%/cycle over 500 cycles. Even when augmenting the sulfur loading to 17.1 mg cm^–2, it can achieve a capacity of 837.3 mA h g^–1 with a retention of ∼80% after 50 cycles. The TiC nanoparticles as well as heteroatom doping in the porous carbon nanofiber exhibit strong physiochemical adsorption and catalytic effect, which is proven by experiments and theoretical calculations. Thus, the diffusion of polysulfides can be effectively inhibited. Meanwhile, heteroatom doping can further enhance the conductivity and reaction activity of this film. Hence, the adsorbed polysulfides could be revived and renewed during the subsequent cycling process, which is accurately observed and confirmed by experiments for the first time.

中文翻译：

多功能薄膜对高负荷锂硫电池的可再生多硫化物调节

所谓的“穿梭效应”严重阻碍了高比能锂硫电池的发展。然而，作为一种有效的策略，大多数改良的分离器无法同时阻止和重复使用多硫化物。在这里，由氮和磷共掺杂的碳纳米纤维与TiC纳米颗粒均匀锚固而成的独特而通用的膜被整合在锂硫电池的隔板和阴极之间。配备了该功能膜的电池在5 C时表现出737.1 mA hg ^–1的高容量，在500个循环中的容量衰减率仅为0.06％/循环。即使将硫负荷增加到17.1 mg cm ^–2，它也可以达到837.3 mA hg ^–1的容量50次循环后保留率约80％。实验和理论计算证明，多孔碳纳米纤维中的TiC纳米颗粒以及杂原子掺杂具有很强的理化吸附和催化作用。因此，可以有效地抑制多硫化物的扩散。同时，杂原子掺杂可以进一步增强该膜的电导率和反应活性。因此，被吸附的多硫化物可以在随后的循环过程中恢复和更新，这是首次被实验准确观察和证实的。

更新日期：2020-10-21

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