Conclusion······································································

CHAPTER II. DUAL-DOPED MESOPOROUS CARBON/SWCNT

2.4. Conclusion······································································

In summary, we presented a SWCNT-embedded, dual (N and S)-doped mesoporous car bon (SMC) shell as a new concept of molecularly designed, ion/electron-conductive nanoshield s to overcome the long-standing challenges (i.e., interfacial problems with liquid electrolytes) f acing LIB electrode materials. The mixing of cathode particles with the SWCNT/PVIm[DS] c oating solution and the subsequent carbonization led to the formation of SMC shells on the c athode particles. The molecular structure of PVIm[DS] was rationally designed to achieve the following multiple functions: (i) precursor for conformal/continuous nanothickness carbon shell s, (ii) dual (N and S)-doping source, (iii) porogen for the mesoporous structure, and (iv) SW CNT dispersant. We comprehensively characterized the SWCNT/PVIm[DS]-derived SMC shells on OLO particles with a particular focus on nanothickness surface coverage, mesopore formati on, and electronic conduction. Due to such chemical/structural uniqueness, the SMC shells pre vented direct exposure of OLO to the bulk liquid electrolyte while facilitating the redox react ion kinetics of OLO. As a consequence, the OLO@SMC significantly enhanced the cell perfo rmance and mitigated the interfacial exothermic reaction between the delithiated OLO and liqu id electrolyte, demonstrating the unusual contribution of the SMC shells as ion/electron-conduc tive nanoshields. The beneficial effects of SMC shells were also observed in the LNMO mate rials, verifying their versatile applicability. The SMC shell, driven by the molecularly designed PIL and synergistic combination with the SWCNTs, is anticipated to open a new route to an exceptional interfacial control strategy for high-energy density/high-performance electrode materials.

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In document Dual-doped mesoporous carbon/SWCNT nanoshells for Li-ion battery electrode materials (Page 45-51)