Hydroxylated Multi‐Walled Carbon Nanotubes Covalently Modified with Tris(hydroxypropyl) Phosphine as a Functional Interlayer for Advanced Lithium–Sulfur Batteries

Abstract

We have successfully constructed a new type of intercalation membrane material by covalently grafting organic tris(hydroxypropyl)phosphine (THPP) molecules onto hydroxylated multi-walled carbon nanotubes (CNT-OH) as a functional interlayer for the advanced LSBs. The as-assembled interlayer has been demonstrated to be responsible for the fast conversion kinetics of polysulfides, the inhibition of polysulfide shuttle effect, as well as the formation of a stable solid electrolyte interphase(SEI) layer. By means of spectroscopic and electrochemical analysis, we further found THPP plays a key role in accelerating the conversion of polysulfides into low-ordered lithium sulfides and suppressing the loss of polysulfides, thus rendering the asdesigned lithium-sulfur battery in this work a high capacity, excellent rate performance and long-term stability. Even at low temperatures, the capacity decay rate was only 0.036 % per cycle for 1700 cycles.

Single Mo–N4 Atomic Sites Anchored on N‐doped Carbon Nanoflowers as Sulfur Host with Multiple Immobilization and Catalytic Effects for High‐Performance Lithium–Sulfur Batteries

“…Interestingly, compared with the first cycle, the redox peak after the third cycle shifted significantly negatively, which was mainly due to the rearrangement of active sulfur from its original position to a position with more stable energy. [44] The CV curves almost overlap after looping to the third circle, implying its good reversibility and stability.…”

A Facile Immobilization Strategy for Soluble Phosphazene to Actualize Stable and Safe Lithium–Sulfur Batteries

“…Furthermore, the potential gap (Δ E ) of LSBs with H‐CMP@SP coating between oxidation and reduction peaks is only 0.34 V which is lower than that of the original PP separator (0.55 V), suggesting that the H‐CMP@SP coating significantly remits the polarization of LSBs owing to fast Li + transfer and optimized electron conduction. [ 30 ] The charge–discharge profiles of the LSBs are shown in Figure 4f. One can see that LSBs exhibit two reduction plateaus and one oxidation plateau, which is consistent with the results in CV.…”

Terahertz Absorption Characteristics of Multiwalled Carbon Nanotube Aqueous Dispersion Measured by Microfluidic Technique

“…Because the outer diameter of the MWCNT used in this experiment is 15 nm, the THz shielding mechanism of the MWCNT in this experiment is mainly absorption. In addition, Yang et al [30] found that the combination of surfactants and carbon nanotubes can improve the polarity of carbon nanotubes. With an increase in EF intensity, the intermolecular van der Waals force weakens because of the increase in molecular dispersion of MWCNTs, but the polarization degree of PVP/MWCNT composite particles increases.…”