title: Confined Solid Electrolyte Interphase Growth Space with Solid Polymer Electrolyte in Hollow Structured Silicon Anode for Li-Ion Batteries.
abstract: Silicon anodes for lithium-ion batteries are of much interest owing to their extremely high specific capacity but still face some challenges, especially the tremendous volume change which occurs in cycling and further leads to the disintegration of electrode structure and excessive growth of solid electrolyte interphase (SEI). Here, we designed a novel approach to confine the inward growth of SEI by filling solid polymer electrolyte (SPE) into pores of hollow silicon spheres. The as-prepared composite delivers a high specific capacity of more than 2100 mAh g-1and a long-term cycle stability with a reversible capacity of 1350 mAh g-1over 500 cycles. The growing behavior of SEI was investigated by electrochemical impedance spectroscopy and differential scanning calorimetry, and the results revealed that SPE occupies the major space of SEI growth and thus confines its excessive growth, which significantly improves cycle performance and Coulombic efficiency of cells embracing hollow silicon spheres.
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Tianyi
authors.initials: T
authors.lastname: Ma
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Xiangnan
authors.initials: X
authors.lastname: Yu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Xiaolu
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Huiyu
authors.identifier: http://orcid.org/0000-0003-2462-1170
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Xinping
authors.identifier: http://orcid.org/0000-0001-5291-7943
authors.initials: X
authors.lastname: Qiu
keywords: Coulombic efficiency; hollow silicon anode; lithium ion battery; solid electrolyte interphase; solid polymer electrolyte