Mesh-liked Carbon Nanosheets Intercalated into Layered TiO2 as a Zero-strain Anode for Lithium-ion Storage

FU Wen-Wu, ZHANG Ming* and SHEN Zhong-Rong*

Chin. J. Struct. Chem. 2021, 40, 797-805  DOI: 10.14102/j.cnki.0254-5861.2011-3054

June 15, 2021

layered titanium dioxide, Schiff base reaction, lithium-ion battery, zero-strain anode

ABSTRACT

Volume change during the insertion/extraction of Li+ in electrode materials is an important issue to affect the safety and stability of Li-ion batteries. Here, we prepare a near-zero volume change material of COF derived mesh-liked carbon/TiO2 (MC/TiO2) composite by using a layered TiO2 as a template, and a two-dimensional COF material is inserted into the interlayers by the Schiff base polymerization between melamine and terephthalaldehyde, followed by carbonization at 500 ℃ to convert COF to mesh-liked carbon nanosheets. Due to the introduction of mesh-liked carbon nanosheets, the interlayer conductivity of TiO2 is improved, and the nanocavities in mesh-liked carbon nanosheets provide additional chambers for the insertion/extraction of Li-ions without any change of the interlayer distance. The MC/TiO2 shows a specific capacity of 472.7 mAh/g at a current density of 0.1 A/g, and good specific capacity retention of 65% remains after 1000 cycles at a current of 1 A/g.

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