The sintering temperature of Li2ZnTi3O8 ceramics is still high for LTCC-based applications. In this work, V2O5 was doped as the sintering aid. The sintered density, phase composition, grain size, as well as microwave ...The sintering temperature of Li2ZnTi3O8 ceramics is still high for LTCC-based applications. In this work, V2O5 was doped as the sintering aid. The sintered density, phase composition, grain size, as well as microwave dielectric properties of Li2ZnTi3O8 ceramics with the addition of V2O5 were investigated. Based on our research, V2O5 doping effectively promoted the densification of Li2ZnTi3O8 ceramics at about 900°C, without affecting the main crystal phase of the ceramics. Li2ZnTi3O8 ceramics with 0.5 wt% V2O5 doping (sintered at 900°C) exhibited the best microwave dielectric properties (Qf =?22,400 GHz at about 6 GHz, εr = 25.5, and τf = -10.8 ppm/°C). The V2O5-doped Li2ZnTi3O8 ceramics were well cofired with Ag inner paste without cracks and diffusion, indicating its significant potential for LTCC applications.展开更多
Li_(2)ZnTi_(3)O_(8)(LZTO)co-doped with Mg^(2+)-W^(6+)(LM6ZTW3O)has been successfully prepared by a facile one-step solid-state route.A co-doping strategy improves ionic conductivity,reduces transfer resistance,interna...Li_(2)ZnTi_(3)O_(8)(LZTO)co-doped with Mg^(2+)-W^(6+)(LM6ZTW3O)has been successfully prepared by a facile one-step solid-state route.A co-doping strategy improves ionic conductivity,reduces transfer resistance,internal resistance and polarization,stabilizes the structure of LZTO and enables the LM6ZTW3O electrode to have a good electrical contact.展开更多
Li_(2)ZnTi_(3)O_(8)(LZTO)as an anode of lithium-ion batteries has been attracting great interest.However,its low electrical conductivity is the biggest obstacle to the practical application of LZTO.The presence of Ti^...Li_(2)ZnTi_(3)O_(8)(LZTO)as an anode of lithium-ion batteries has been attracting great interest.However,its low electrical conductivity is the biggest obstacle to the practical application of LZTO.The presence of Ti^(3+)can improve the electronic conductivity of LZTO via the introduction of oxygen vacancies(OVs).Nevertheless,excess OVs can cause severe lattice distortion and then worsen the electrochemical per-formance of LZTO.In this study,defective LZTO anodes with different concentrations of OVs are fabri-cated by a practical solid-state method.The effects of OVs on LZTO are investigated by experiments and first-principles calculations.The results show that the presence of OVs promotes random Zn/Ti distri-bution.LZTO with an appropriate concentration of OVs(LZTO-FA)can stabilize the structure,decrease the diffusion barriers of Li+ions and transfer resistance.Therefore,LZTO-FA has good electrochemical performance from 0 to 55℃.More importantly,compared with LZTO with a perfect structure,the inter-calation potential of LZTO-FA decreases as shown by the calculations.Therefore,the energy densities of the full cells can be improved using LZTO-FA as the anode.So,the findings can be instructive in the improvement of the electrochemical performance of LZTO via the introduction of OVs.展开更多
文摘The sintering temperature of Li2ZnTi3O8 ceramics is still high for LTCC-based applications. In this work, V2O5 was doped as the sintering aid. The sintered density, phase composition, grain size, as well as microwave dielectric properties of Li2ZnTi3O8 ceramics with the addition of V2O5 were investigated. Based on our research, V2O5 doping effectively promoted the densification of Li2ZnTi3O8 ceramics at about 900°C, without affecting the main crystal phase of the ceramics. Li2ZnTi3O8 ceramics with 0.5 wt% V2O5 doping (sintered at 900°C) exhibited the best microwave dielectric properties (Qf =?22,400 GHz at about 6 GHz, εr = 25.5, and τf = -10.8 ppm/°C). The V2O5-doped Li2ZnTi3O8 ceramics were well cofired with Ag inner paste without cracks and diffusion, indicating its significant potential for LTCC applications.
基金supported by the Henan Joint Funds of the National Natural Science Foundation of China(U1504532)the Natural Science Foundation of Liaoning Shihua University(2018XJJ-012).
文摘Li_(2)ZnTi_(3)O_(8)(LZTO)co-doped with Mg^(2+)-W^(6+)(LM6ZTW3O)has been successfully prepared by a facile one-step solid-state route.A co-doping strategy improves ionic conductivity,reduces transfer resistance,internal resistance and polarization,stabilizes the structure of LZTO and enables the LM6ZTW3O electrode to have a good electrical contact.
基金supported by the National Natural Science Foundation of China(U1504532)the Liaoning Province Project Education Fund(LJKZ0408 and L2019043)+1 种基金the LiaoNing Revitalization Talents Program(XLYC1907025)the Natural Science Foundation of Liaoning Shihua University(2018XJJ-012).
文摘Li_(2)ZnTi_(3)O_(8)(LZTO)as an anode of lithium-ion batteries has been attracting great interest.However,its low electrical conductivity is the biggest obstacle to the practical application of LZTO.The presence of Ti^(3+)can improve the electronic conductivity of LZTO via the introduction of oxygen vacancies(OVs).Nevertheless,excess OVs can cause severe lattice distortion and then worsen the electrochemical per-formance of LZTO.In this study,defective LZTO anodes with different concentrations of OVs are fabri-cated by a practical solid-state method.The effects of OVs on LZTO are investigated by experiments and first-principles calculations.The results show that the presence of OVs promotes random Zn/Ti distri-bution.LZTO with an appropriate concentration of OVs(LZTO-FA)can stabilize the structure,decrease the diffusion barriers of Li+ions and transfer resistance.Therefore,LZTO-FA has good electrochemical performance from 0 to 55℃.More importantly,compared with LZTO with a perfect structure,the inter-calation potential of LZTO-FA decreases as shown by the calculations.Therefore,the energy densities of the full cells can be improved using LZTO-FA as the anode.So,the findings can be instructive in the improvement of the electrochemical performance of LZTO via the introduction of OVs.
