The design and facile fabrication of CrTi-based anode materials with long-life, good safety, and low cost are strongly desired for lithium-ion batteries. In this study, we adopt the sol–gel method using glucose as carbon source to synthesize carbon-coated Li 5 Cr 7 Ti 6 O 25 . The effects of a carbon layer in Li 5 Cr 7 Ti 6 O 25 /C on electrochemical properties are focused through comparing carbon-coated Li 5 Cr 7 Ti 6 O 25 with carbon-free Li 5 Cr 7 Ti 6 O 25 . Electrochemical tests show that Li 5 Cr 7 Ti 6 O 25 /C possesses better cycling and rate performances than those of carbon-free Li 5 Cr 7 Ti 6 O 25 . Cycled at 500 mA g –1, Li 5 Cr 7 Ti 6 O 25 /C delivers a high specific capacity of 111.6 mAh g –1 with 13% capacity loss after 200 cycles. In contrast, Li 5 Cr 7 Ti 6 O 25 only exhibits a specific capacity of 93.6 mAh g –1 at 500 mA g –1 with 19% capacity loss after 200 cycles. The preeminent electrochemical property of Li 5 Cr 7 Ti 6 O 25 /C is ascribed to the amorphous carbon coating layer. This carbon layer can remarkably facilitate the transportation of electrons and ions in Li 5 Cr 7 Ti 6 O 25 . Furthermore, the lithiation/delithiation behavior of Li 5 Cr 7 Ti 6 O 25 /C is also investigated by advanced in situ X-ray diffraction technique, and the results verify that Li 5 Cr 7 Ti 6 O 25 /C possesses a highly reversible structural change during the charge/discharge process.
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Yan et al. (2016) studied this question.
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