首页|Lamellar sulfonated acid polymer-initiated in situ construction of robust LiF-rich SEI enabling superior charge transport for ultrastable and fast charging silicon anodes
Lamellar sulfonated acid polymer-initiated in situ construction of robust LiF-rich SEI enabling superior charge transport for ultrastable and fast charging silicon anodes
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The extreme volume expansion of the silicon(Si)anodes during repeated cycles seriously induces unde-sirable interfacial side reactions,forming an unstable solid electrolyte interphase(SEI)that degrades the electrode integrity and cycle stability in lithium-ion batteries,limiting their practical applications.Despite considerable efforts to stabilize the SEI through surface modification,challenges persist in the development of high-performance Si anodes that effectively regulate intrinsic SEI properties and simul-taneously facilitate electron/ion transport.Here,a highly conductive and organic electrolyte-compatible lamellar p-toluenesulfonic acid-doped polyaniline(pTAP)layer is proposed for constructing a robust arti-ficial SEI on Si nanoparticles to achieve fast charging,long-term cycle lifespan and high areal capacity.The spatially uniform pTAP layer,formed through a facile direct-encapsulation approach assisted by enriched hydrogen bonding,contributes to the effective formation of in situ SEI with an even distribution of the LiF-rich phase in its interlamination spaces.Furthermore,the integrated artificial SEI facilitates isotropic ion/electron transport,increased robustness,and effectively dissipates stress from volume changes.Consequently,a notably high rate performance of 570 mA h g-1,even at a substantially high current den-sity of 10 A g-1,is achieved with excellent cyclic stability by showing a superior capacity over 1430 mA h g-1 at 1 A g-1 after 250 cycles and a high areal capacity of ca.2 mA h cm-2 at 0.5 C in a full cell system.This study demonstrates that the rational design of conductive polymers with SEI modulation for surface protection has great potential for use in high-energy-density Si anodes.
Graduate Institute of Ferrous & Eco Materials Technology(GIFT),Pohang University of Science and Technology(POSTECH),77 Cheongam-ro,Nam-gu,Pohang-si,Gyeongsangbuk-do 37673,Republic of Korea
Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),77 Cheongam-Ro,Nam-gu,Pohang-si,Gyeongsangbuk-do 37673,Republic of Korea
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