A carbon-doped anatase TiO2-Based flexible silicon anode with high-performance and stability for flexible lithium-ion battery

Boqiao LI, Wei ZHAO, Zhe YANG, Chen ZHANG, Fei DANG, Yilun LIU, Feng JIN, Xi CHEN

Research output: Journal PublicationsJournal Article (refereed)peer-review

35 Citations (Scopus)

Abstract

Flexible Si composite anodes consisting of mechanical anatase TiO2 robust buffer layer anchored on carbon cloth has been synthesized through the controllable in-situ sol-gel techniques. This novel TiO2 layers demonstrate the remarkable suppress ability to alleviate the silicon volume variation during the lithiation and delithiation process. As a result, the Si/TiO2-CC composite anodes exhibit the remarkable reversible areal capacity of 3.21 mA h/cm2 (1720 mA h/g of Si active particles) at the current density of 0.2 mA/cm2 and 1.82 mA h/cm2 (1380 mA h/g of Si active particles) at 3 mA/cm2, meanwhile, it can maintain the capacity retention of 94.5% after 100 cycles at 3 mA/cm2. Furthermore, an all-flexible battery based on Si/TiO2-CC anode and NCM811 cathode is also fabricated. The flexible battery shows excellent mechanical integrity and Si interface stability under continuous bending and twisting state, due to the “bridge” effect of TiO2 layer. Our work provides a new route to establish the silicon-based flexible anodes using high-modulus bonding materials to suppress silicon volume expansion. © 2020 Elsevier B.V.
Original languageEnglish
Article number228339
JournalJournal of Power Sources
Volume466
DOIs
Publication statusPublished - 1 Aug 2020
Externally publishedYes

Bibliographical note

This research was supported by Earth Engineering Center and Center for Advanced Materials for Energy and Environment at Columbia University. Acknowledges support from the National Natural Science Foundation of China (11572238 and 11872302), Key R&D Program of Shaanxi (2018ZDXM-GY-131).

Keywords

  • Encapsulated structure
  • Flexible Si anode
  • Robust TiO2 layer
  • Stable cycle performance
  • Volume variation suppression

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