The development of flame retardant or nonflammable electrolytes is the key to improve the safety of lithium batteries,owing to inflammable organic solvents and polymer matrix in common liquid and polymer electrolytes ...The development of flame retardant or nonflammable electrolytes is the key to improve the safety of lithium batteries,owing to inflammable organic solvents and polymer matrix in common liquid and polymer electrolytes regarded as the main cause of battery fire.Herein,a series of solid-state polyphosphate oligomers(SPPO)as a three-in-one electrolyte that integrated the roles of lithium salt,dissociation matrix,and flame retardant were synthesized.The well-designed SPPO electrolytes showed an optimal ionic conductivity of 5.5×10^(-4)S cm-1at 30℃,an acceptable electrochemical window up to 4.0 V vs.Li/Li+,and lithium ion transference number of 0.547.Stable Li-ion stripping/plating behavior for 500 h of charge-discharge cycles without internal short-circuit in a Li|SPPO|Li cell was confirmed,together with outstanding interface compatibility between the SPPO electrolyte and lithium foil.The optimal Li|SPPO|LiFePO4cell presented good reversible discharge capacity of 149.4 mA h g-1at 0.1 C and Coulombic efficiency of 96.4%after 120 cycles.More importantly,the prepared SPPO cannot be ignited by the lighter fire and show a limited-oxygen-index value as high as 35.5%,indicating splendid nonflammable nature.The SPPO could be a promising candidate as a three-in-one solid-state electrolyte for the improved safety of rechargeable lithium batteries.展开更多
Combining steel anticorrosive requirements and thoughts of environment protection,we designed a molecular of effective corrosion inhibitors and synthesized a series of poly-phosphate compounds by environmental-friendl...Combining steel anticorrosive requirements and thoughts of environment protection,we designed a molecular of effective corrosion inhibitors and synthesized a series of poly-phosphate compounds by environmental-friendly ways.展开更多
为获得反硝化聚磷菌(DNPAOs)干粉菌剂,以反硝化聚磷菌B8液态菌剂为菌种来源,以麦麸、玉米干粉混合物作为载体,以牛肉膏蛋白胨培养基为发酵液,进行增菌培养.在麦麸、玉米干粉载体配比(W/W)为85%∶15%,投菌液量为4 m L·g^(-1)干粉,...为获得反硝化聚磷菌(DNPAOs)干粉菌剂,以反硝化聚磷菌B8液态菌剂为菌种来源,以麦麸、玉米干粉混合物作为载体,以牛肉膏蛋白胨培养基为发酵液,进行增菌培养.在麦麸、玉米干粉载体配比(W/W)为85%∶15%,投菌液量为4 m L·g^(-1)干粉,发酵液用量为4 m L·g^(-1)干粉的条件下制得干粉菌剂.其使用效果为:(1)当主要污水处理因子为硝酸盐氮时,干粉菌剂成品的最佳发酵液p H值为5.5,该菌剂对化学需氧量、硝酸盐氮和总磷的去除率可达43.26%、92.76%和65.77%;(2)当主要处理因子为总磷时,则同等条件下所制得的干粉菌剂成品的最佳发酵液p H值为6.5,该菌剂对化学需氧量、硝酸盐氮和总磷的去除率可达44.41%、56.21%和87.30%.扫描电镜显示B8菌株附着于菌剂载体上,吸收培养液的营养用于繁殖生长及发酵,干燥后B8可固定于载体上,再将其投放于待处理废水中即可发挥其菌效.展开更多
基金the financial support of the National Natural Science Foundation of China(21961044,22169024)the Yunnan Fundamental Research Projects(202105AC160072,202101BC070001-019,202101AT070280,202102AB080017)the Yunnan University’s Research Innovation Fund for graduate students(2021Y394)。
文摘The development of flame retardant or nonflammable electrolytes is the key to improve the safety of lithium batteries,owing to inflammable organic solvents and polymer matrix in common liquid and polymer electrolytes regarded as the main cause of battery fire.Herein,a series of solid-state polyphosphate oligomers(SPPO)as a three-in-one electrolyte that integrated the roles of lithium salt,dissociation matrix,and flame retardant were synthesized.The well-designed SPPO electrolytes showed an optimal ionic conductivity of 5.5×10^(-4)S cm-1at 30℃,an acceptable electrochemical window up to 4.0 V vs.Li/Li+,and lithium ion transference number of 0.547.Stable Li-ion stripping/plating behavior for 500 h of charge-discharge cycles without internal short-circuit in a Li|SPPO|Li cell was confirmed,together with outstanding interface compatibility between the SPPO electrolyte and lithium foil.The optimal Li|SPPO|LiFePO4cell presented good reversible discharge capacity of 149.4 mA h g-1at 0.1 C and Coulombic efficiency of 96.4%after 120 cycles.More importantly,the prepared SPPO cannot be ignited by the lighter fire and show a limited-oxygen-index value as high as 35.5%,indicating splendid nonflammable nature.The SPPO could be a promising candidate as a three-in-one solid-state electrolyte for the improved safety of rechargeable lithium batteries.
文摘Combining steel anticorrosive requirements and thoughts of environment protection,we designed a molecular of effective corrosion inhibitors and synthesized a series of poly-phosphate compounds by environmental-friendly ways.
文摘为获得反硝化聚磷菌(DNPAOs)干粉菌剂,以反硝化聚磷菌B8液态菌剂为菌种来源,以麦麸、玉米干粉混合物作为载体,以牛肉膏蛋白胨培养基为发酵液,进行增菌培养.在麦麸、玉米干粉载体配比(W/W)为85%∶15%,投菌液量为4 m L·g^(-1)干粉,发酵液用量为4 m L·g^(-1)干粉的条件下制得干粉菌剂.其使用效果为:(1)当主要污水处理因子为硝酸盐氮时,干粉菌剂成品的最佳发酵液p H值为5.5,该菌剂对化学需氧量、硝酸盐氮和总磷的去除率可达43.26%、92.76%和65.77%;(2)当主要处理因子为总磷时,则同等条件下所制得的干粉菌剂成品的最佳发酵液p H值为6.5,该菌剂对化学需氧量、硝酸盐氮和总磷的去除率可达44.41%、56.21%和87.30%.扫描电镜显示B8菌株附着于菌剂载体上,吸收培养液的营养用于繁殖生长及发酵,干燥后B8可固定于载体上,再将其投放于待处理废水中即可发挥其菌效.
