Chelation-assisted formation of multi-yolk–shell Co₄N@carbon nanoboxes for self-discharge-suppressed high-performance Li–SeS₂ batteries

Abstract

A chelation competition induced polymerization strategy was exploited to prepare multi-yolk–shell Co4N@carbon nanoboxes, greatly enhancing the overall performance of Li–SeS2 batteries.

Cobalt doped JUC-160 derived functional carbon superstructures with synergetic catalyst effect for Li-SeS2 batteries

“…In addition, it was observed that SA has no considerable effect on the phase composition of SeS2, after 100 cycles at 0.2C, the XRD signals of the electrode have no obvious change (Fig. S15), which is consistent with previous reports [12,50] and this further confirmed that the CNC-0.05/SeS2 electrode has high electrochemical stability and the highly reversible conversion of SeS2. Moreover, after cycling, the surface structural features of the cycled cathode were further observed.…”

“…It suggests that the cobalt doping of CNC-0.05/SeS2 can effectively inhibit the dissolution of high-order polysulfides/polyselenides into the electrolyte. Compared with CNC-0/SeS2, the onset evoked reduction peaks of CNC-0.05/SeS2 move towards higher voltage (2.06 V) and the oxidation peak moves toward a smaller voltage (2.28 V), and this promotes the redox potential difference of CNC-0.05/SeS2 is being significantly lower than CNC-0/SeS2, and this phenomenon suggests that the presence of CNC-0.05/SeS2 can effectively reduce the electrochemical polarization [12]. Fig.…”

“…These carbon/SeS2 cathode materials can anchor polysulfide/selenium compounds through chemical constraints, thus significantly improving the electrochemical performance of the Li-SeS2 batteries. Therefore, the carbonaceous materials with polar metal [10], metal nitride [11,12] and metal sulfides [9,13] have been widely used in the field of Li-SeS2 batteries. Zeolites based imidazoliates framework (ZIF) is a kind of zeolite-like metal-organic framework (MOF).…”

“…Based on the above advantages, MOF materials have been widely used in the field of Li-Se and Li-S batteries [2,26]. However, to the best of our knowledge, MOF derived carbon materials are rarely reported in the field of Li-SeS2 batteries [10,12,27]. Moreover, the application of MOF derived self-assembled cathode materials has not been reported in this area.…”

A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

“…To meet the demand of high energy density Li–SeS 2 batteries, a high SeS 2 areal loading and a low electrolyte-to-selenium sulfide (E/SeS 2 ) ratio are commonly essential. However, most of recent studies on Li–SeS 2 batteries focused solely on the high capacity performance under a low SeS 2 areal loading (< 2.0 mg cm −2 ) and a high E/SeS 2 ratio (> 15 μL mg −1 ) [ 16 , 66 ]. As such, we further fabricated a series of high-areal-loading and low-E/SeS 2 -ratio cells with the CF@CNTs-NPP interlayers.…”