All-solid-state lithium batteries(ASSLBs)are important for enhancing safety across various applications related to lithium-ion batteries(LIBs).Lithium iron phosphate(LiFePO4)is a widely utilized commercial cathode in ...All-solid-state lithium batteries(ASSLBs)are important for enhancing safety across various applications related to lithium-ion batteries(LIBs).Lithium iron phosphate(LiFePO4)is a widely utilized commercial cathode in LIBs,prized for its stable cycling performance,thermal stability,and low cost.However,low electronic conductivity and slow ion diffusion kinetics limit its application at high rates and low temper-atures.Herein,Ti3C2Tx MXene nanosheets(NSs)are introduced into the LiFePO4 cathode.The continu-ous electron-conducting networks are constructed due to the high electrical conductivity of Ti3C2Tx NSs.Meanwhile,the coordination environment of lithium ions in the cathode is weakened by the oxygenated end groups of Ti3C2Tx NSs,and thus efficient ion-percolating networks are constructed.Therefore,the ionic and electronic conductivities of the modified cathode are significantly improved.Assembled all-solid-state LiFePO4/Li full cells with poly(ethylene oxide)as electrolyte exhibits high initial discharged capacities of 91.5 mAh g^(-1) at 10 C,and capacities of 155.1 mAh g^(-1) after 1000 cycles at 1 C with a re-tention rate of 93.8%.Furthermore,the cells still deliver excellent performance at high loading,room temperature,and low temperature.This work offers a facile and scalable strategy for designing high-performance ASSLBs.展开更多
The LiFePO4 nanotubes were successfully fabricated by a sol-gel method with porous anodic aluminum oxide as the template. Transmission electron microscopy and scanning electron microscopy showed that the synthesized L...The LiFePO4 nanotubes were successfully fabricated by a sol-gel method with porous anodic aluminum oxide as the template. Transmission electron microscopy and scanning electron microscopy showed that the synthesized LiFeP04 nanotubes were monodispersed and parallel to one another. Selected area electron diffraction pattern, X-ray diffraction and X-ray photoelectron spectroscopy investigations jointly demonstrated that the synthesized LiFePO4 nanotubes were pure olivine structure. This approach offered a potentially way for fabricating ordered LiFePO4 nanotubes at room temperature and ambient conditions, which might be expected to find promising application as a new cathode material in lithium ion battery,展开更多
以Fe(NO3)3,LiNO3,NH4H2PO4和NaNO3为原料,采用简单的液相-碳热还原法合成Li0.97Na0.03FePO4/C复合正极材料.使用X射线衍射(XRD)、扫描电子显微镜(SEM)和充放电等测试技术研究了材料的结构及倍率充放电性能.通过循环伏安(CV)曲线和电化...以Fe(NO3)3,LiNO3,NH4H2PO4和NaNO3为原料,采用简单的液相-碳热还原法合成Li0.97Na0.03FePO4/C复合正极材料.使用X射线衍射(XRD)、扫描电子显微镜(SEM)和充放电等测试技术研究了材料的结构及倍率充放电性能.通过循环伏安(CV)曲线和电化学阻抗谱(EIS)研究电极反应过程中的动力学特点.结果表明,Na掺杂形成了具有橄榄石结构的Li0.97Na0.03FePO4固溶体,并增大了晶格中Li+一维扩散通道,使LiFePO4/C的电荷转移电阻减小了约2/3,Li+扩散系数提高了3～4倍.因此,Li0.97Na0.03FePO4/C首次放电比容量在0.1 C和2 C倍率下分别达到152 mAh g-1和109 mAh g-1,比未掺杂的LiFePO4/C的放电比容量分别提高了4.83%和62.69%.展开更多
基金supported by the Natural Science Foundation of Shandong Province(Nos.ZR2022QE014 and ZR2021QH237)the National Natural Science Foundation of China(Grant Nos.52401221,51971120,and U1902221)the Medical StaffScience and Technology Plan of Shandong Province(No.SDYWZGKCJH2022073).
文摘All-solid-state lithium batteries(ASSLBs)are important for enhancing safety across various applications related to lithium-ion batteries(LIBs).Lithium iron phosphate(LiFePO4)is a widely utilized commercial cathode in LIBs,prized for its stable cycling performance,thermal stability,and low cost.However,low electronic conductivity and slow ion diffusion kinetics limit its application at high rates and low temper-atures.Herein,Ti3C2Tx MXene nanosheets(NSs)are introduced into the LiFePO4 cathode.The continu-ous electron-conducting networks are constructed due to the high electrical conductivity of Ti3C2Tx NSs.Meanwhile,the coordination environment of lithium ions in the cathode is weakened by the oxygenated end groups of Ti3C2Tx NSs,and thus efficient ion-percolating networks are constructed.Therefore,the ionic and electronic conductivities of the modified cathode are significantly improved.Assembled all-solid-state LiFePO4/Li full cells with poly(ethylene oxide)as electrolyte exhibits high initial discharged capacities of 91.5 mAh g^(-1) at 10 C,and capacities of 155.1 mAh g^(-1) after 1000 cycles at 1 C with a re-tention rate of 93.8%.Furthermore,the cells still deliver excellent performance at high loading,room temperature,and low temperature.This work offers a facile and scalable strategy for designing high-performance ASSLBs.
基金supported by tile National Natural Science Foundation of China(No.50375151,No.50323007 and No.50572107)863 Program(No.2002AA302609)"Hundreds Talent Program"of Chinese Academy of Sciences for financial Support.
文摘The LiFePO4 nanotubes were successfully fabricated by a sol-gel method with porous anodic aluminum oxide as the template. Transmission electron microscopy and scanning electron microscopy showed that the synthesized LiFeP04 nanotubes were monodispersed and parallel to one another. Selected area electron diffraction pattern, X-ray diffraction and X-ray photoelectron spectroscopy investigations jointly demonstrated that the synthesized LiFePO4 nanotubes were pure olivine structure. This approach offered a potentially way for fabricating ordered LiFePO4 nanotubes at room temperature and ambient conditions, which might be expected to find promising application as a new cathode material in lithium ion battery,
文摘以Fe(NO3)3,LiNO3,NH4H2PO4和NaNO3为原料,采用简单的液相-碳热还原法合成Li0.97Na0.03FePO4/C复合正极材料.使用X射线衍射(XRD)、扫描电子显微镜(SEM)和充放电等测试技术研究了材料的结构及倍率充放电性能.通过循环伏安(CV)曲线和电化学阻抗谱(EIS)研究电极反应过程中的动力学特点.结果表明,Na掺杂形成了具有橄榄石结构的Li0.97Na0.03FePO4固溶体,并增大了晶格中Li+一维扩散通道,使LiFePO4/C的电荷转移电阻减小了约2/3,Li+扩散系数提高了3～4倍.因此,Li0.97Na0.03FePO4/C首次放电比容量在0.1 C和2 C倍率下分别达到152 mAh g-1和109 mAh g-1,比未掺杂的LiFePO4/C的放电比容量分别提高了4.83%和62.69%.
