V₂CT_X catalyzes polysulfide conversion to enhance the redox kinetics of Li–S batteries

Abstract

Lithium–sulfur batteries (LBSs) have potential to become the future energy storage system, yet they are plagued by the sluggish redox kinetics. Therefore, enhancing the redox kinetics of polysulfide is a...

Platinum Electrocatalyst Promoting Redox Kinetics of Li2S and Regulating Li2S Nucleation for Lithium–Sulfur Batteries

“…Consequently, the diffusion coefficient of Li ions (D Li + ) can be described by the classical Randles-Sevcik equation (Note S3, Supporting Information). [33] As demonstrated by the relationship between I and 𝜈 0.5 for peaks IIIand peaks I in Figure 6h,i…”

“…Consequently, the diffusion coefficient of Li ions$$\ ( {{D}_{{\mathrm{Li}}^{\mathrm{ + }}}} )$$ can be described by the classical Randles–Sevcik equation (Note S3, Supporting Information). [ 33 ] As demonstrated by the relationship between I and ν 0.5 for peaks IIIand peaks I in Figure 6h,i, each peak corresponds to the rate‐determining step of discharge/charge that dominates the overall redox reaction kinetics. The PtHCNB/MWCNT/S cathode is found to have substantially higher $${D}_{{\mathrm{Li}}^{\mathrm{ + }}}( {{D}_{{\mathrm{Li}}^{\mathrm{ + }}}( {{\mathrm{III}}} ) = 5.81 \times {{10}}^{ - 8},\,{D}_{{\mathrm{Li}}^{\mathrm{ + }}}({\mathrm{I}}) = 1.53 \times {{10}}^{ - 7}{\mathrm{cm}}^{\mathrm{2}}{{\mathrm{s}}}^{ - {\mathrm{1}}}} )$$ than the HCNB/MWCNT/S cathode $$({D}_{{\mathrm{Li}}^{\mathrm{ + }}}({\mathrm{III}}) = 3.34 \times {{10}}^{ - 8}$$, $${D}_{{\mathrm{Li}}^{\mathrm{ + }}}({\mathrm{I}}) = 7.07 \times {{10}}^{ - 8}{\mathrm{cm}}^{\mathrm{2}}{{\mathrm{s}}}^{ - 1})$$.…”