Crystalline@amorphous NiCo_(2)S_(4)@MoS_(2)(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realiz...Crystalline@amorphous NiCo_(2)S_(4)@MoS_(2)(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realized the defect regulation of crystal NiCo_(2)S_(4) in the core.Taking advantage of the flexible protection of an amor-phous shell and the high capacity of a conductive core with defects,the v-NCS@MS electrode exhibited high specif-ic capacity(1034 mAh·g^(-1) at 1 A·g^(-1))and outstanding rate capability.Moreover,a hybrid supercapacitor was assembled with v-NCS@MS as cathode and activated carbon(AC)as anode,which can achieve remarkably high specific energy of 111 Wh·kg^(-1) at a specific power of 219 W·kg^(-1) and outstanding capacity retention of 80.5%after 15000 cycling at different current densities.展开更多
水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔...水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔对碘的强约束和氮掺杂对碘的强化学吸附的优点,可使碘的负载量高达61.6 wt%.密度泛函理论计算和实验研究表明,氮掺杂所赋予的丰富活性位点能促进AZIBs的氧化还原动力学,吡啶氮掺杂对AZIBs的吸附可逆转化比普通氮掺杂更有效.高负载碘电极在1.0 C时表现出219.3 mA h g^(-1)的高容量,优异的速率性能,以及优越的循环稳定性,在5.0 C时,循环10,000次内的容量衰减极低,每圈仅为0.00147%.由三节电池串联的初步装置,能量密度高,按电池总质量计算可达72.6 W h kg^(-1),几乎是商用铅酸和镍-镉电池能量密度的两倍.该水系电池的高能量密度和长循环寿命使其在大规模储能应用领域具有巨大潜力.展开更多
高能、长循环寿命和高充放电速率的阴极材料是限制发展静态稳定电能存储和动力电源用先进锂电池的关键材料问题。基于脱嵌锂过程的层状锂过渡金属氧化物、过渡金属磷酸锂和富锂氧化物的阴极材料的容量发展遇到了瓶颈,因此探索基于新电...高能、长循环寿命和高充放电速率的阴极材料是限制发展静态稳定电能存储和动力电源用先进锂电池的关键材料问题。基于脱嵌锂过程的层状锂过渡金属氧化物、过渡金属磷酸锂和富锂氧化物的阴极材料的容量发展遇到了瓶颈,因此探索基于新电化学过程的新型高容量阴极材料的研究非常重要。基于硫(S)和Li2S的阴极材料具有高的理论容量(1673mA h g-1和1166mA h g-1),成为发展高容量和高能锂离子电池阴极材料研究的重点。综述了解决硫阴极材料面临的电子和锂离子传导能力差、充放电过程中可溶性硫的溶解及体积变化等关键科学问题的新思路和新方法,为发展新型硫阴极材料提供参考和启发。展开更多
文摘Crystalline@amorphous NiCo_(2)S_(4)@MoS_(2)(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realized the defect regulation of crystal NiCo_(2)S_(4) in the core.Taking advantage of the flexible protection of an amor-phous shell and the high capacity of a conductive core with defects,the v-NCS@MS electrode exhibited high specif-ic capacity(1034 mAh·g^(-1) at 1 A·g^(-1))and outstanding rate capability.Moreover,a hybrid supercapacitor was assembled with v-NCS@MS as cathode and activated carbon(AC)as anode,which can achieve remarkably high specific energy of 111 Wh·kg^(-1) at a specific power of 219 W·kg^(-1) and outstanding capacity retention of 80.5%after 15000 cycling at different current densities.
基金supported by the Tianjin Natural Science Foundation of China(20JCZDJC00280 and 19JCQNJC05900)the National Key R&D Program of China(2017YFA0700104)the National Natural Science Foundation of China(21905205)。
文摘水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔对碘的强约束和氮掺杂对碘的强化学吸附的优点,可使碘的负载量高达61.6 wt%.密度泛函理论计算和实验研究表明,氮掺杂所赋予的丰富活性位点能促进AZIBs的氧化还原动力学,吡啶氮掺杂对AZIBs的吸附可逆转化比普通氮掺杂更有效.高负载碘电极在1.0 C时表现出219.3 mA h g^(-1)的高容量,优异的速率性能,以及优越的循环稳定性,在5.0 C时,循环10,000次内的容量衰减极低,每圈仅为0.00147%.由三节电池串联的初步装置,能量密度高,按电池总质量计算可达72.6 W h kg^(-1),几乎是商用铅酸和镍-镉电池能量密度的两倍.该水系电池的高能量密度和长循环寿命使其在大规模储能应用领域具有巨大潜力.
文摘高能、长循环寿命和高充放电速率的阴极材料是限制发展静态稳定电能存储和动力电源用先进锂电池的关键材料问题。基于脱嵌锂过程的层状锂过渡金属氧化物、过渡金属磷酸锂和富锂氧化物的阴极材料的容量发展遇到了瓶颈,因此探索基于新电化学过程的新型高容量阴极材料的研究非常重要。基于硫(S)和Li2S的阴极材料具有高的理论容量(1673mA h g-1和1166mA h g-1),成为发展高容量和高能锂离子电池阴极材料研究的重点。综述了解决硫阴极材料面临的电子和锂离子传导能力差、充放电过程中可溶性硫的溶解及体积变化等关键科学问题的新思路和新方法,为发展新型硫阴极材料提供参考和启发。
