Preparation of Mo-doping LiFePO₄/C by carbon reduction method

ABSTRACT

A Mo-doping LiFe_1-xMo_xPO₄/C cathode material was synthesized via carbothermal reduction route, and the effect of the content of Mo on the structure and electrochemical performance of LiFePO₄/C was studied. XRD results revealed doping of Mo did not change the olivine structure of LiFePO₄/C, but also formed the Li⁺ vacancies, which contribute to increase the diffusion rate of Li⁺. The experimental results further demonstrated that among the Mo-doping samples, the LiFe_0.98Mo_0.02PO₄/C exhibited the best cycle performance and rate performance. After 100 cycles at 0.1 C, its discharge specific capacity reached 143.2 mAh·g⁻¹, which was about 10 mAh·g⁻¹ higher than that of pure phase LiFePO₄/C. The capacity retention rate was 98%. When cycling at a rate of up to 5 C, the discharge specific capacity of LiFe_0.98Mo_0.02PO₄/C can still be maintained above 90 mAh·g⁻¹, indicating that Mo doping was an effective method to improve LiFePO₄/C electrochemical performance.

KEYWORDS:

• Composite
• cathode
• LiFePO₄/C
• Mo-doping
• electrochemical

Additional information

Funding

This work was supported by the Liaoning Innovation Talents in University (No.LR2017079) and Liaoning Provincial Natural Science Foundation of China (No.2020-BS-154).