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Caption :  sem images (a,b) and tem image (c) of the sample obtained at 70 ℃, 36 h with 1 ml fluorine source; sem images (d,e) and tem image (f) of the sample obtianed at 120 ℃, 36 h with 1 ml fluorine source.

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Caption : xrd results of the sample obtained at 70 ℃, 36 h with 1 ml fluorine source (a) and the sample obtianed at 120 ℃, 36 h with 1 ml fluorine source (b): solid diamonds represent the peak position of cubic fe1.9f4.75•0.95h2o phase and solid circle represent the peak positions of  hematite-fe2o3 phase.

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Caption : sem images of the samples obtained at 90 ℃ with 1 ml fluorine source under different reaction time：(a,b) 10 h; (d,e) 48 h; the corresponding tem images: (c) 10 h; (f) 48 h.

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Caption : xrd results of the samples obtained at 90 ℃ with 1 ml fluorine source under different reaction time: (a) 1 h and (b) 48 h : red bars represent the peak positions of cubic fe1.9f4.75•0.95h2o phase and black bars represent the peak positions of fef3•h2o phase.

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Caption :  xrd results of the samples obtianed at 90 ℃, 36 h with different amoutn of fluorine source: (a) 0.2 ml; (b) 3 ml and (c) 5 ml: red bars represent the peak positions of cubic fe1.9f4.75•0.95h2o phase; black bars represent the peak positions of fef3•h2o phase; solid diamonds represent the peak positions of hematite-fe2o3 phase. 

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Caption : sem images of the samples obtianed at 90 ℃, 36 h with different amoutn of fluorine source: (a) 0.2 ml; (d) 3 ml and (g) 5 ml; the corresponding tem images: (b,c) 0.2 ml; (e,f) 3 ml and (h,i) 5 ml.

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Caption : the electrochemical performances comparation of the samples obtianed at 90 ℃, 36 h with different amoutn of fluorine source: (a)the charge-discharge curves of the 30th cycle at a rate of 0.3 c; (b) cycling performance at a rate of 0.3 c.

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Caption : the comparation of the cycling performances of the samples obtianed at 90 ℃ (black solid squares) and 70 ℃ (red solid circles) under 36 h with 1 ml fluorine source.

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Caption : sem (a,b) and tem (c,d) images of the cathodes after 100 cycles at 0.1 c

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Caption : eds elemental mapping of the cathodes after 100 cycles at 0.1 c