Hollow core-shell eta-Fe(2)O(3) microspheres exhibit not only superior electrochemical performance as lithium storage electrodes but also excellent sensitivities to trace levels of gases.

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Fe 2 P-LiFePO 4 composites were synthesized by a novel method consisting of co-precipitation modified with in situ polyacrylamide (PAM) formation. Simultaneous thermogravimetric-differential scanning calorimetric analysis indicated that the in situ PAM precursor exhibited a moderate continuous weight loss rather than a sharp mass loss process. The best Fe 2 P-LiFePO 4 composite was obtained from 14 wt% in situ PAM precursor under a sintering temperature of 750°C for 20 h, which delivered a discharge capacity of 131 mAh g -1 at a rate of C/5 and 110 mAh g -1 at 1 C and sustained 30 cycles with almost no capacity fading. The relatively good electrochemical performance originates mainly from the well-mixed gelation precursor and conductive Fe 2 P phase with better electronic conductivity. This novel method verified that the electrochemical performance was improved compared to the conventional LiFePO 4 without in situ PAM. It can be anticipated that the same process should be readily extendable to other olivines, such as LiMnPO 4 and LiCo-PO 4 , and also to other phosphates.

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