使用介孔LiTi2(PO4)3@C负极的长寿命水系可充电锂电池。

Long-lived Aqueous Rechargeable Lithium Batteries Using Mesoporous LiTi2(PO4)3@C Anode.

作者信息

Sun Dan, Tang Yougen, He Kejian, Ren Yu, Liu Suqin, Wang Haiyan

机构信息

College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P.R. China.

Advanced Research Centre, Central South University, Changsha, 410083, P.R. China.

出版信息

Sci Rep. 2015 Dec 9;5:17452. doi: 10.1038/srep17452.

DOI:10.1038/srep17452

PMID:26648263

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4673533/

Abstract

The instability of anode materials during cycling has been greatly limiting the lifetime of aqueous rechargeable lithium batteries (ARLBs). Here, to tackle this issue, mesoporous LiTi2(PO4)3@C composites with a pore size of 4 nm and a large BET surface area of 165 m(2) g(-1) have been synthesized by a novel two-step approach. The ARLB with this type of LiTi2(PO4)3@C anode, commercial LiMn2O4 cathode and 2 M Li2(SO4) aqueous solution (oxygen was removed) exhibited superior cycling stability (a capacity retention of 88.9% after 1200 cycles at 150 mA g(-1) and 82.7% over 5500 cycles at 750 mA g(-1)) and excellent rate capability (discharge capacities of 121, 110, 90, and 80 mAh g(-1) based on the mass of LiTi2(PO4)3 at 30, 150, 1500, and 3000 mA g(-1), respectively). As verified, the mesoporous structure, large surface area and high-quality carbon coating layer of the LiTi2(PO4)3@C composite contribute to the breakthrough in achieving excellent electrochemical properties for ARLB.

摘要

阳极材料在循环过程中的不稳定性极大地限制了水系可充电锂电池（ARLBs）的使用寿命。在此，为解决这一问题，通过一种新颖的两步法合成了孔径为4 nm、BET表面积为165 m² g⁻¹的介孔LiTi₂(PO₄)₃@C复合材料。采用这种LiTi₂(PO₄)₃@C阳极、商用LiMn₂O₄阴极和2 M Li₂(SO₄)水溶液（已除氧）的ARLBs表现出优异的循环稳定性（在150 mA g⁻¹下1200次循环后容量保持率为88.9%，在750 mA g⁻¹下5500次循环后为82.7%）和出色的倍率性能（基于LiTi₂(PO₄)₃质量，在30、150、1500和3000 mA g⁻¹下的放电容量分别为121、110、90和80 mAh g⁻¹）。经证实，LiTi₂(PO₄)₃@C复合材料的介孔结构、大表面积和高质量碳涂层有助于ARLBs在实现优异电化学性能方面取得突破。