4.4 Article

Simple Preparation of Co3O4 with a Controlled Shape and Excellent Lithium Storage Performance

Journal

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 15, Issue 4, Pages 2894-2902

Publisher

ESG
DOI: 10.20964/2020.04.35

Keywords

Co3O4; Sheet and spherical; Two-dimensional; Lithium ion battery

Funding

  1. National Natural Science Foundation of China [21965017, 51764029]
  2. Provincial Natural Science Foundation of Yunnan [2017FB085, 2018FB087]

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Co3O4 and Co(OH)(2) precursors with spherical and a coexisting sheet-spherical morphologies were efficiently prepared using room-temperature deposition combined with calcination. Compared with spherical Co3O4, coexisting sheet-spherical Co3O4 has better crystallinity and outstanding lithium storage performance. The first discharge capacity reaches 1089 mAh g(-1). The charging capacity is 604 mAh g(-1), demonstrating a 50-cycle capacity retention of 70%. The enhanced lithium-ion storage capacity is attributed to the two-dimensional structure of the coexisting sheet and spherical morphology contained in the sheet material; additionally, the surface has a large surface area. Thus, the coexisting sheet-spherical morphology can alleviate the volume expansion caused by lithium-ion insertion, while retaining a high capacity and good cycling performance.

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