Molecularly designed, dual-doped mesoporous carbon/SWCNT nanoshields for lithium battery electrode materials

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Journal of Materials Chemistry A, ISSN: 2050-7488, Vol: 4, Issue: 39, Page: 14996-15005

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Jang, Ye-Ri, Kim, Ju-Myung, Lee, Jung-Han, Cho, Sung-Ju, Kim, Guntae, Ju, Young-Wan, Yeon, Sun-Hwa, Yoo, JongTae, Lee, Sang-Young
Royal Society of Chemistry (RSC), ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY, The Royal Society of Chemistry
Chemistry, Energy, Materials Science
article description
Formidable challenges facing lithium-ion rechargeable batteries, which involve performance degradations and safety failures during charge/discharge cycling, mostly arise from electrode-electrolyte interface instability. Here, as a polymeric ionic liquid (PIL)-mediated interfacial control strategy to address this long-standing issue, we demonstrate a new class of molecularly designed, ion/electron-conductive nanoshields based on single-walled carbon nanotube (SWCNT)-embedded, dual-doped mesoporous carbon (referred to as "SMC") shells for electrode materials. The SMC shell is formed on cathode materials through solution deposition of the SWCNT/PIL mixture and subsequent carbonization. The PIL (denoted as "PVIm[DS]") synthesized in this study consists of poly(1-vinyl-3-ethylimidazolium) cations and dodecyl sulfate counter anions, whose molecular structures are rationally designed to achieve the following multiple functions: (i) precursor for the conformal/continuous nanothickness carbon shell, (ii) dual (N and S)-doping source, (iii) porogen for the mesoporous structure, and (iv) SWCNT dispersant. Driven by such chemical/structural uniqueness, the SMC shell prevents direct exposure of cathode materials to bulk liquid electrolytes while facilitating redox reaction kinetics. As a consequence, the SMC-coated cathode materials enable significant improvements in cell performance and also thermal stability. We envision that the SMC shell can be suggested as a new concept of effective and versatile surface modification strategy for next-generation high-performance electrode materials.

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