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ÕâÊÇһƪ·¢±íÔÚPCCPÉϵÄÎÄÕ£¬Ö÷Òª½²ÊöÁË̼ºÍÄÉÃ׽ṹ½ðÊôµÄ¸´ºÏÓ¦ÓÃÔÚ³¬¼¶µçÈÝÆ÷ÉÏ£¬ÆÚ¿¯Ó°ÏìÒò×Ó²»ÊÇÌ«¸ß£¬µ«Ò²ÓÐÒ»¶¨µÄ²Î¿¼¼ÛÖµ£¬ÎÄÕÂÌâÄ¿£ºCarbon coated nano-LiTi2(PO4)3 electrodes for non-aqueous hybrid supercapacitors¡£ The Pechini type polymerizable complex decomposition method is employed to prepare LiTi2(PO4)3 at 1000 1C in air. High energy ball milling followed by carbon coating by the glucose-method yielded C-coated nano-LiTi2(PO4)3 (LTP) with a crystallite size of 80(5) nm. The phase is characterized by X-ray diffraction, Rietveld refinement, thermogravimetry, SEM, HR-TEM and Raman spectra. Lithium cycling properties of LTP show that 1.75 moles of Li (B121 mA h g1 at 15 mA g1 current) per formula unit can be reversibly cycled between 2 and 3.4 V vs. Li with 83% capacity retention after 70 cycles. Cyclic voltammograms (CV) reveal the two-phase reaction mechanism during Li insertion/extraction. A hybrid electrochemical supercapacitor (HEC) with LTP as negative electrode and activated carbon (AC) as positive electrode in non-aqueous electrolyte is studied by CV at various scan rates and by galvanostaticcycling at various current rates up to 1000 cycles in the range 0¨C3 V. Results show that the HEC delivers a maximum energy density of 14 W h kg1 and a power density of 180 W kg1. |
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