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Structure and electrochemical performance of Ba Li_(2-x)Na_xTi_6O_(14)(0≤x≤2) as anode materials for lithium-ion battery 被引量:1
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作者 陶伟 徐茂莲 +2 位作者 朱彦荣 张千玉 伊廷锋 《Science China Materials》 SCIE EI CSCD 2017年第8期728-738,共11页
A series of Ba Li_(2-x)NaxTi_6O_(14)(0≤x≤2) compounds as lithium storage materials were synthesized by a facile solidstate method. X-ray diffraction Rietveld refinement shows that the Bragg positions correspon... A series of Ba Li_(2-x)NaxTi_6O_(14)(0≤x≤2) compounds as lithium storage materials were synthesized by a facile solidstate method. X-ray diffraction Rietveld refinement shows that the Bragg positions correspond to the Ba Li_2Ti_6O_(14), indicating a successful preparation. The Na+ions doped Ba Li_2-Ti_6O_(14) compounds have larger unit-cell volume than the pristine one because ionic radius of Na+ion is 55% larger than that of Li+ion. SEM shows that the Ba Li_2-xNaxTi_6O_(14)(x=0, 0.5 and1) powders show similar irregular shaped particles between500 and 1000 nm. However, Ba Li_2-xNaxTi_6O_(14)(x=1.5 and 2)powders show similar rod-like shape. CV reveals that the passivating film is mainly formed during the first insertion process, and the solid electrolyte interface film on the surface of Ba Li_2-xNaxTi_6O_(14)(0≤x≤2) is formed below 0.7 V in the first cycle. Compared with other samples, Ba Li_0.5Na1.5Ti_6O_(14) exhibits higher reversible capacity, better rate capability and superior cyclability. Ba Li_0.5Na1.5Ti_6O_(14) delivers the delithiation capacities of 162.1 mAhg^-(1)at 50 m A g^-(1), 158.1 mAhg^-(1)at 100 m A g^-(1), 156.7 mAhg^-(1)at 150 m A g^-(1), 152.2 mAhg^-(1)at 200 m A g^-(1), 147.3 mAhg^-(1)at 250 m A g^-(1)and 142 mAhg^-(1)at 300 m A g^-(1), respectively. An interesting thing is that Ba Na2Ti_6O_(14) as anode also shows an acceptable electrochemical performance. All these improved electrochemical performances of Ba Li_0.5Na1.5Ti_6O_(14) are attributed to the lowest polarization and the highest lithium ion diffusion coefficient among all samples.Hence, Ba Li_0.5Na1.5Ti_6O_(14) with excellent cycling performance,simple synthesis route and wide discharge voltage range can be a possible anode candidate for lithium-ion batteries. 展开更多
关键词 Ba Li2Ti6O14 Ba Na2Ti6O14 anode material lithiumion battery delithiation capacity
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