Lamellar sulfonated acid polymer-initiated in situ construction of robust LiF-rich SEI enabling superior charge transport for ultrastable and fast charging silicon anodes  

作　　者：Jungsoo Park Song Kyu Kang Junhyuk Ji Hwichan Ahn Gwan Hyeon Park Minho Kim Won Bae Kim 

机构地区：[1]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 [2]Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),77 Cheongam-Ro,Nam-gu,Pohang-si,Gyeongsangbuk-do 37673,Republic of Korea

出　　处：《Journal of Energy Chemistry》2024年第11期134-143,共10页能源化学（英文版）

基　　金：National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [NRF-2021R1A5A1084921];the “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea [No. 20204010600100];the Materials and Components Technology Development Program of the Ministry of Trade, Industry and Energy (MOTIE, Korea) and Korea Electronics Technology Institute (KETI) [20012224]。

摘　　要：The extreme volume expansion of the silicon(Si) anodes during repeated cycles seriously induces undesirable 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 simultaneously 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 artificial SEI on Si nanoparticles to achieve fast charging,lo ng-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 density 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.

关 键 词：Lithium-ion battery Silicon anode Conductive polymers Solid electrolyte interphase 

分 类 号：TQ317[化学工程—高聚物工业] TM912[电气工程—电力电子与电力传动]