期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 1, 页码 636-643出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01656
关键词
mesoporous particles; anatase TiO2; Nb-doping; Li-ion battery; Na-ion battery; negative electrode
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [17H03128, 17K17888, 16K05954]
- Advanced Characterization Nanotechnology Platform, Nano technology Platform Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan at the Research Center for Ultra-High Voltage Electron Microscopy in Osaka University [A-17-OS-0020, A-18-OS-0002]
- Grants-in-Aid for Scientific Research [17K17888, 16K05954] Funding Source: KAKEN
Mesoporous spherical aggregates of Nb-doped anatase TiO2 nanoparticles were synthesized by a simple one pot solvothermal method in supercritical methanol and were evaluated as anode materials for Li-ion and Na-ion batteries. A Li-ion battery electrode of mesoporous undoped TiO2 showed a significantly improved performance compared to that of a commercial TiO2 without mesoporous structure. An electrode of the 7 at. % Nb-doped TiO2 exhibited a further improved performance with the discharge (Li-extraction) capacity of 147 mA h g(-1) even at the 1000th cycle and with that of 110 mA h g(-1) at a high current rate of 10 C, which is comparable to the performances of Li4Ti5O12 in practical use for Li-ion battery anode. On the other hand, it achieved an outstanding cycle life with the discharge (Na-extraction) capacity of 128 mA h g(-1) up to almost 1000 cycles. These excellent performances are attributed to Nb-doping in addition to the large reaction area of the mesoporous structure. The Nb-doping presented two important effects: (i) the improvement in the electronic conductivity and (ii) the broadening of ion-diffusion path in TiO2. Consequently, we believe that the mesoporous spherical TiO2 is very promising as Li and Na storage materials for rechargeable batteries.
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