以废旧磷酸铁锂(Li Fe PO_4)正极材料为原料,经过热处理除杂和固相补锂后,利用碳热还原反应重新获得了电化学性能优异的Li Fe PO_4/C正极材料。测试结果表明,补加物质的量分数为10%的Li2CO_3和质量分数为25%的葡萄糖可获得结晶度良好、...以废旧磷酸铁锂(Li Fe PO_4)正极材料为原料,经过热处理除杂和固相补锂后,利用碳热还原反应重新获得了电化学性能优异的Li Fe PO_4/C正极材料。测试结果表明,补加物质的量分数为10%的Li2CO_3和质量分数为25%的葡萄糖可获得结晶度良好、无杂质的Li Fe PO_4/C正极材料,且能有效弥补其可循环锂的损失。在0.1C和20C倍率下,其放电比容量分别为159.6 m A·h/g和86.9 m A·h/g,在10C倍率下,经1 000次循环后,再生Li Fe PO_4正极材料的容量保持率为91%。说明该方法可有效处理废旧Li Fe PO_4电池,为大规模循环再利用废旧Li Fe PO_4正极材料提供了一条可行的途径。展开更多
N-K2Ti4O9/UiO-66-NH2 composites synthesized by a facile solvothermal method have a core-shell structure with UiO-66-NH2 forming the shell around a N-K2Ti4O9 core.Their photocatalytic activities in the degradation of d...N-K2Ti4O9/UiO-66-NH2 composites synthesized by a facile solvothermal method have a core-shell structure with UiO-66-NH2 forming the shell around a N-K2Ti4O9 core.Their photocatalytic activities in the degradation of dyes under visible light irradiation were investigated.The N-K2Ti4O9/UiO-66-NH2 composites exhibited higher photocatalytic activity than the pure components.This synergistic effect was due to the high adsorption capacity of UiO-66-NH2 and that the two components together induced an enhanced separation efficiency of photogenerated electron-hole pairs.The mass ratio of N-K2Ti4O9 to ZrCl4 of 3：7 in the composite exhibited the highest photocatalytic activity.Due to the electrostatic attraction between the negatively charged backbone of UiO-66-NH2with the positively charged groups of cationic dyes,the composites were more photocatalytically active for cationic dyes than for anionic dyes.展开更多
文摘以废旧磷酸铁锂(Li Fe PO_4)正极材料为原料,经过热处理除杂和固相补锂后,利用碳热还原反应重新获得了电化学性能优异的Li Fe PO_4/C正极材料。测试结果表明,补加物质的量分数为10%的Li2CO_3和质量分数为25%的葡萄糖可获得结晶度良好、无杂质的Li Fe PO_4/C正极材料,且能有效弥补其可循环锂的损失。在0.1C和20C倍率下,其放电比容量分别为159.6 m A·h/g和86.9 m A·h/g,在10C倍率下,经1 000次循环后,再生Li Fe PO_4正极材料的容量保持率为91%。说明该方法可有效处理废旧Li Fe PO_4电池,为大规模循环再利用废旧Li Fe PO_4正极材料提供了一条可行的途径。
基金supported by the National Natural Science Foundation of China (51372062)the Anhui Provincial Natural Science Foundation(1508085MB28,1308085MB21)~~
文摘N-K2Ti4O9/UiO-66-NH2 composites synthesized by a facile solvothermal method have a core-shell structure with UiO-66-NH2 forming the shell around a N-K2Ti4O9 core.Their photocatalytic activities in the degradation of dyes under visible light irradiation were investigated.The N-K2Ti4O9/UiO-66-NH2 composites exhibited higher photocatalytic activity than the pure components.This synergistic effect was due to the high adsorption capacity of UiO-66-NH2 and that the two components together induced an enhanced separation efficiency of photogenerated electron-hole pairs.The mass ratio of N-K2Ti4O9 to ZrCl4 of 3：7 in the composite exhibited the highest photocatalytic activity.Due to the electrostatic attraction between the negatively charged backbone of UiO-66-NH2with the positively charged groups of cationic dyes,the composites were more photocatalytically active for cationic dyes than for anionic dyes.
