Co–B Nanoflakes as Multifunctional Bridges in ZnCo 2 O 4 Micro-/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Jiaojiao Deng, Xiaoliang Yu, Xianying Qin, Dong Zhou, Lihan Zhang, Huan Duan, Feiyu Kang, Baohua Li, Guoxiu Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

57 Citations (Scopus)

Abstract

Transition metal oxides hold great promise as high-energy anodes in next-generation lithium-ion batteries. However, owing to the inherent limitations of low electronic/ionic conductivities and dramatic volume change during charge/discharge, it is still challenging to fabricate practically viable compacted and thick TMO anodes with satisfactory electrochemical performance. Herein, with mesoporous cobalt–boride nanoflakes serving as multifunctional bridges in ZnCo 2 O 4 micro-/nanospheres, a compacted ZnCo 2 O 4 /Co–B hybrid structure is constructed. Co–B nanoflakes not only bridge ZnCo 2 O 4 nanoparticles and function as anchors for ZnCo 2 O 4 micro-/nanospheres to suppress the severe volume fluctuation, they also work as effective electron conduction bridges to promote fast electron transportation. More importantly, they serve as Li + transfer bridges to provide significantly boosted Li + diffusivity, evidenced from both experimental kinetics analysis and density functional theory calculations. The mesopores within Co–B nanoflakes help overcome the large Li + diffusion barriers across 2D interfaces. As a result, the ZnCo 2 O 4 /Co–B electrode delivers high gravimetric/volumetric/areal capacities of 995 mAh g −1 /1450 mAh cm −3 /5.10 mAh cm −2 , respectively, with robust rate capability and long-term cyclability. The distinct interfacial design strategy provides a new direction for designing compacted conversion-type anodes with superior lithium storage kinetics and stability for practical applications.

Original languageEnglish
Article number1803612
JournalAdvanced Energy Materials
Volume9
Issue number14
DOIs
Publication statusPublished - 11 Apr 2019
Externally publishedYes

Keywords

  • boosted kinetics
  • Co–B nanoflakes
  • high cycling stability
  • volumetric lithium storage
  • ZnCo O micro-/nanospheres

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this