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.