Facile synthesis of polypyrrole-modified Li5Cr7Ti6O25 with improved rate performance as negative electrode material for Li-ion batteries

By Tingfeng Yi, Jie Mei, Panpan Peng, Shao‐hua Luo. Composites Part B: Engineering, 2019

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Abstract Pristine Li5Cr7Ti6O25 and polypyrrole-modified Li5Cr7Ti6O25 materials are successfully synthesized by a facile sol-gel process. Based on the X-ray diffraction pattern and high-resolution transmission electron microscopy, a homogeneous polypyrrole layer is successfully coated on the surface of Li5Cr7Ti6O25 particles. The polypyrrole modification improves the reversibility and migration ability of lithium intercalation/deintercalation and reduces the charge-transfer reaction resistance. Li5Cr7Ti6O25@ polypyrrole shows higher delithiation/lithiation capacities and more excellent cycling performance at different charge-discharge rates than the pristine one. Li5Cr7Ti6O25@polypyrrole delivers a delithiation capacity of 115.9 mAh·g−1 with 87.23% capacity retention cycled at 10C/3 rate after 300 cycles and a delithiation capacity of 132 mAh g−1 with 72.2% capacity retention cycled at 20C/3 charge-discharge rate after 150 cycles. Hence, polypyrrole coating can be considered as an effective way to enhance the electrochemical property of Li5Cr7Ti6O25 for advanced Li-ion battery, and the effective design strategy may be used to improve the lithium storage capacity and cycling stability of other Ti-based negative electrodes.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/e9cdd24b683145d413c0ea6fe8d0448fb5c8ca7d