Integrating SEI into Layered Conductive Polymer Coatings for Ultrastable Silicon Anodes

Siyuan Pan; Junwei Han; Yiqiao Wang; Zhenshen Li; Fanqi Chen; Yong Guo; Zishan Han; Kefeng Xiao; Zhichun Yu; Mengying Yu; Shichao Wu; Da-Wei Wang; Quan-Hong Yang

doi:10.1002/adma.202203617

Integrating SEI into Layered Conductive Polymer Coatings for Ultrastable Silicon Anodes

Adv Mater. 2022 Aug;34(31):e2203617. doi: 10.1002/adma.202203617. Epub 2022 Jun 30.

Authors

Siyuan Pan^{1

2}, Junwei Han¹, Yiqiao Wang^{1

2}, Zhenshen Li^{1

2}, Fanqi Chen^{1

2}, Yong Guo^{1

2}, Zishan Han^{1

2}, Kefeng Xiao³, Zhichun Yu³, Mengying Yu³, Shichao Wu^{1

2}, Da-Wei Wang³, Quan-Hong Yang^{1

2

4}

Affiliations

¹ Nanoyang Group, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China.
² Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192, China.
³ School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia.
⁴ Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China.

PMID: 35679574
DOI: 10.1002/adma.202203617

Abstract

Tackling the huge volume expansion of silicon (Si) anode desires a stable solid electrolyte interphase (SEI) to prohibit the interfacial side reactions. Here, a layered conductive polyaniline (LCP) coating is built on Si nanoparticles to achieve high areal capacity and long lifespan. The conformal LCP coating stores electrolyte in interlamination spaces and directs an in situ formation of LCP-integrated hybrid SEI skin with uniform distribution of organic and inorganic components, enhancing the flexibility of the SEI to buffer the volume changes and maintaining homogeneous ion transport during cycling. As a result, the Si anode shows a remarkable cycling stability under high areal capacity (≈3 mAh cm^-2 ) after 150 cycles and good rate performance of 942 mAh g^-1 at 5 A g^-1 . This work demonstrates the great potential of regulating the SEI properties by a layered polymer-directing SEI formation for the mechanical and electrochemical stabilization of Si anodes.

Keywords: 2D materials; conductive polymers; lithium-ion batteries; silicon anodes; solid electrolyte interphase.

Abstract

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