Lithium-selenium sulfide batteries with long cycle life and high energy density via solvent washing treatment

Covalent Organic Frameworks for Batteries

“…These batteries have a theoretical capacity as high as 1125 mAh g −1 . [102,173] However, Li-SeS 2 batteries suffer the same problems as Li-S batteries, where shuttle effects lead to loss of selenium/sulfur and thus cause poor cycling stability and low rate performance. [102,173] Wang et al [102] employed a COF-coated separator and achieved superior rate performance and cycling stability in lithium-selenium sulfide batteries.…”

“…[102,173] However, Li-SeS 2 batteries suffer the same problems as Li-S batteries, where shuttle effects lead to loss of selenium/sulfur and thus cause poor cycling stability and low rate performance. [102,173] Wang et al [102] employed a COF-coated separator and achieved superior rate performance and cycling stability in lithium-selenium sulfide batteries. The narrower cavity size of COF coatings effectively blocked the transport of polysulfide/polyselenide species in the electrolyte, and the methoxyl groups in the COF structure enhanced the Li + migration ability compared to the bare Celgard separator.…”

Advances in Selenium Sulfides Cathodes for Lithium/Selenium–Sulfur Batteries

“…First, the key features of porous carbons are their extensive specific surface area and high porosity. The elevated porosity enables the electrolyte to permeate the electrode’s inner chamber, ensuring adequate engagement between the active substance and electrolyte. − This interaction is crucial for efficient battery performance. Second, the expansive surface area provides ample room for the accommodation of Se x S y as well as the absorption of polysulfides and polyselenides.…”

In Situ Generation of AlF3 in Nanoporous Carbon to Enable Cathode–Electrolyte Interface Construction for Stable Li–Se Batteries

“…The Se cathode causes volumetric expansion during the discharging process, with the destruction of the structure and integrity induced by the density variation from Se to Li 2 Se. , More importantly, owing to its high electrolyte solubility, the lithium polyselenides migrate to the lithium anode under the electric field and concentration gradient, which brings about corrosion to the lithium anode. Se-based cathodes are increasingly investigated to achieve their high energy density potential. , Single strategies often make it difficult to achieve satisfactory results, but the synthesis process of composite materials is usually complex and not conducive to commercialization.…”