Journal
SOLID STATE IONICS
Volume 315, Issue -, Pages 1-6Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2017.11.034
Keywords
Energy storage; Aqueous rechargeable lithium battery; LiTi2(PO4)(3)/C composite; Li vacancy; Electrochemical kinetics
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Funding
- Natural Sciences Foundation of Hunan Province, China [2016JJ3065, 2017JJ3103]
- National Natural Science Foundation of China [21706060, 51703061]
- National Science Foundation for Postdoctoral Scientists of China [2016M592427]
- Research Foundation of Hunan Agricultural University [13YJ02, 14YJ05]
- Hunan Provincial Key Laboratory for Germplasm Innovation and Utilization of Crop [15KFXM06, 15KFXM20]
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In this paper, Li1-xTi2(PO4)(3)/C composites (x = 0, 0.03, 0.05, 0.07) were synthesized by sol-gel approach, and the influence of Li vacancy on electrochemical performance of LiTi2(PO4)(3)/C anode for aqueous rechargeable lithium battery was studied. Li vacancy hardly influences the crystal structure and morphology of the composite. Electrochemical measurement results demonstrated that Li1-xTi2(PO4)(3)/C exhibited better performance compared with pristine LiTi2(PO4)(3)/C, and Li0.95Ti2(PO4)(3)/C has the best properties. Li0.95Ti(PO4)(3)/C delivered the discharge capacity of 104.3, 92.6, and 71.8 mAh g(-1) at 0.2, 5, and 20 degrees C (1 C = 150 mA g(-1)), 4.1, 27.3, and 34.4 inAh g(-1) larger than that of Li0.90Ti2(PO4)(3)/C at corresponding rates, respectively. After 1000 cycles at 5 C, the discharge capacity retention for Li0.90Ti2(PO4)(3)/C can reach 75.3%, 15.4% larger than that for LiTi2(PO4)(3)/C. Our study reveals that Li vacancy is an efficient method to enhance the electrochemical properties of LiTi2(PO4)(3)-based materials.
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