Implanting nickel and cobalt phosphide into well-defined carbon nanocages: A synergistic adsorption-electrocatalysis separator mediator for durable high-power Li-S batteries

By Zeliang Wu, Shixia Chen, Liang Wang, Q. Deng, Zheling Zeng, Jun Wang, Shuguang Deng. Energy Storage Materials, 2021

195 citations recorded by the source corpus.

Abstract Transition metal phosphides (TMPs) are proposed as promising polysulfides (LiPSs) mediates with simultaneous strong adsorption and fast conversion capabilities, which is essential for high-energy Lithium-sulfur (Li-S) batteries. Unfortunately, the attempts of using TMPs as sulfur hosts in cathodes suffer from low sulfur loading and poor rate performance. Herein, Ni, Co bimetal phosphides are in-situ implanted into hollow carbon nanocages (Ni-Co-P@C) and utilized as the multifunctional separator interlayer to achieve durable Li-S batteries that can work at high current rates. Benefiting from the unique hollow nanocage and abundant synergistic adsorption-electrocatalytic sites, the Li-S battery with Ni-Co-P@C separator achieves ultrastable lifespan with only 0.056% capacity decay per cycle over 1000 cycles at 0.5 C and superior rate capability of 654.5 mAh g−1 at 5 C. Moreover, the Li-S batteries with a high sulfur loading of 4.5 mg cm−2 can still maintain a high areal capacity of 3.7 mAh cm−2 after 85 cycles. This work demonstrates a new strategy to apply TMPs as a multifunctional mediator in separators for durable high-power Li-S batteries.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/30ab11430802f02f45c141e671d65553001807f3