N-doped carbon coated LiTi2(PO4)3 as superior anode using PANi as carbon and nitrogen bi-sources for aqueous lithium ion battery

作者：He, Zhangxing; Jiang, Yingqiao; Zhu, Jing; Wang, Haiyan^*; Li, Yuehua; Zhou, Huizhu; Meng, Wei; Dai, Lei; Wang, Ling^*

来源：Electrochimica Acta, 2018, 279: 279-288.

DOI：10.1016/j.electacta.2018.05.096

• Energy storage
• Aqueous lithium ion battery
• LiTi2(PO4)(3)
• Carbon coating
• Polyaniline

N-doped carbon coated LiTi2(PO4)(3) composites were synthesized by polyaniline (PANi) as carbon and nitrogen bi-sources, and used as anode for aqueous lithium ion battery (ALIB). High-quality N-doped carbon layers were achieved to modify LiTi2(PO4)(3) crystal. ALIB using as-synthesized LiTi2(PO4)(3)@C-N as anode exhibited superior rate performance. It delivered discharge capacities of 122.4, 105.8, and 95.3mAh g(-1) at rates of 0.2, 10, and 20C, respectively, much higher than those (97.4, 61.1, and 43.9mAh g(-1)) of LiTi2(PO4)(3) /C using sucrose as carbon source. Furthermore, LiTi2(PO4)(3)@C-N anode demonstrated outstanding cycling performance with a capacity retention of 82.1% after 1000 cycles at 2C, while only 56.3% of capacity retention was kept for that using sucrose as carbon source. The excellent electrochemical performances of LiTi2(PO4)(3)@ C-N are mainly attributed to good dispersion, proper carbon layer, and nitrogen doping, further accelerating the charge transfer and diffusion of Li ions/electrons.

• 出版日期2018-7-20
• 单位东华理工大学; 中国科学技术大学; 中南大学