To inhibit the shuttle effect and promote the electrochemical performance of the Li/SeS 2 batteries, the threedimensional (3D) conductive composite of freestanding Fe 0.4 Co 8.6 S 8 nanotube/nanosheet arrays on carbon cloth (CC@ Fe 0.4 Co 8.6 S 8 ) is designed and synthesized to host SeS 2 . The integrated host appears in the form of the Fe 0.4 Co 8.6 S 8 nanosheets growing on the surface of nanotubes supported by carbon cloth, which provides a great surface area and offers secondary protection from nanosheets against shuttle of polyselenides/sulfides on the basis of nanotubes. Such enhanced physical confinement, along with chemical immobilization of the polar Fe 0.4 Co 8.6 S 8 , ensures high capability to adsorb polyselenides/sulfides. The wellconstructed conductive network facilitates the fast redox reaction to lessen the dissolution and diffusion of polyselenides/sulfides. It was demonstrated by the adsorption test and explained by the systematic self-discharge experiments. As a result, upon the elevated current density and/or SeS 2 loading, the deliberately designed architecture of CC@Fe 0.4 Co 8.6 S 8 can exhibit large reversible capacity as well as great energy density. Specifically, with the areal loading of 2 mg cm −2 , the CC@Fe 0.4 Co 8.6 S 8 /SeS 2 electrode delivers high discharge capacity of 888 mAh g −1 at 1.0 A g −1 and excellent rate capability (585 mAh g −1 at 4.0 A g −1 ). In addition, with the areal loading increasing to 3.6 mg cm 2 , the cathode still reaches an ultrahigh capacity of 703 mAh g −1 at 1.0 A g −1 . Upon further increasing SeS 2 loading to 4.8 mg cm 2 , the corresponding areal energy density reaches 8.05 mWh cm −2 at 0.2 A g −1 . This contribution adopts a less complex structure to address the issues in Li/SeS 2 batteries. The effectiveness of shuttle inhibition is explained quantitatively through a systematic study on self-discharge phenomena, besides the electrochemical performance.
Cobalt sulfide (Co4S3) is considered as one of the most promising anode materials for lithium-ion battery owing to its high specific capacity. However, some disadvantages, such as poor electrical conductivity...
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