TiO_(2)负极材料的制备及其电化学性能

TiO_(2) negative material made by eletrooxidation and characterization

为克服二氧化钛负极材料阻抗较大的缺点,提高其电化学性能,提出了电解氧化法制备二氧化钛负极材料工艺,通过改变磷酸二氢钠质量浓度,实现控制磷元素的掺杂量。结果表明:适量磷元素掺杂有助于减小样品的电子传输阻抗和锂离子扩散阻抗,提高了其放电比容量和循环保持率;当磷酸二氢钠质量浓度为4.8%时,在1.0 A/g的电流密度测试条件下,其放电比容量达到了150.8 mA·h/g;循环150周期后,放电容量保持率为68.9%。

This paper is aimed at overcoming the drawback of higher impedance of titanium dioxide anode material and improve its electrochemical properties.The study involves preparing TiO_(2) negative material using the electrooxidation method and achieving the goal of controlling phosphorus doping content by adjusting sodium hydrogen phosphate content.The results show that some phosphorus doping content can minish its electron transmission resistance and Lithium ion diffusion impedance and there improve its specific discharging capacity and rate of capactity retention.with 1.0 A/g of ampere density in the presence of the sodium phosphate monobasic content of 4.8%,its dischargeing specific capacity is 150.8 mA·h/g and in the loop test,its capacity retention ratio is 68.9%after 150 cycles.