Syntheses and Application of All-lithium Salts of Heteropolyacid as Electrolyte of Lithium-ion Battery |
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Authors: | CHEN Ya-guang WANG Cun-guo ZHANG Xi-yan XIE De-Min WANG Rong-shun |
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Institution: | Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China |
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Abstract: | The all-lithium salts of heteropoly acid LixXM12O40(HPA-Li)(X=P, Si; M=Mo, W) were obtained via ion exchange and characterized by means of IR and UV spectroscopies, TG and elemental analyses. The conductivity of the electrolytic solution consisting of Li3PW12O40 and PC/DME mixing solvent(1/2.5, volume ratio) is up to 7.2×10-2 S/cm, being higher than that of LiClO4 as the electrolyte. The all-lithium salts were used as electrolytes in secondary lithium-ion batteries. The discharge capacity of the PAS/Li batteries with Li3PW12O40 electrolyte solutions reaches to 148 (mA*h)/g and the cyclic life is up to 380 times, much better than those of commercialized products with LiClO4 and LiAsF6 as electrolytes. |
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Keywords: | All-lithium salt Heteropoly compound Electrolyte Lithium-ion secondary battery |
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