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The extensive application of LiFePO4 batteries for energy storage in recent years will result in a large number of spent LiFePO4 batteries in the future. How to properly recycle these spent LiFePO4 batteries becomes an extremely thorny subject. Here, a sustainable and facile strategy has been developed to regenerate LiFePO4 materials as novel anode materials for alkaline secondary batteries. For the first time, it has been interestingly found that the repaired LiFePO4 anode with Bi2S3 additive in alkaline solutions can deliver prominent anodic performance, with a high specific capacity of ∼242.2 mAh g–1 at 50 mA g–1 (showing a charge efficiency of ∼88.1%), excellent high-rate performance (∼173.6 mAh g–1 still retains even at 1250 mA g–1), and good cycling life (capacity retention of ∼97.5% after 100 cycles at 50 mA g–1). It is first discovered that alkaline LiFePO4 anode goes through a dissolution–deposition process during the charge–discharge process. Furthermore, a unique alkaline Ni­(OH)2/LiFePO4 battery system is successfully established by adopting the recovered LiFePO4 materials and Ni­(OH)2 cathodes. The assembled full battery with a commercial electrode loading lever of ∼30 mg cm–2 can deliver both high specific energy and power densities, which is comparable with commercial Ni/Fe batteries. This work not only proposes an attractive route to recycle spent LiFePO4 of lithium-ion batteries in large scale but also offers an economical way to produce sustainable anodes for Ni/Fe batteries.

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This paper aims to reveal the effect of adding biomass ash on the flow characteristics of Zhundong (ZD) coal ash. A new visual image measurement method for the flowability of coal ash was established. Furthermore, scanning electron microscopy (SEM) and x-ray diffraction (XRD) were applied to analyze the influence of surface morphology and mineral component on the fusion fluidity of the samples. The results show that the flow properties of ZD ash are improved to varying degrees after adding maize straw (MS) ash. As the blending ratio increases, the improvement of flow velocity is higher. The critical flow temperature (T C ) of the samples was calculated. The T C of ZD ash was 1249 C, which decreased with the addition of MS ash. The characterization