The evolution in electrochemical performance of Li4-XCaxTi5O12 (Ca doped Li4Ti5O12) as anode materials for lithium ion batteries

Autor: Fan Zhang, Manman Xia, Ying Zhang, Baige Yuan, Ruyan Lei, Peng Zhao, Xiao Li, Jun Li
Rok vydání: 2021
Předmět:
Zdroj: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 616:126329
ISSN: 0927-7757
DOI: 10.1016/j.colsurfa.2021.126329
Popis: Doping elements play an important role in improving the conductivity of Li4Ti5O12 used as anode materials for lithium ion batteries. In this work, nanoparticles of Li4-XCaxTi5O12 (x = 0, 0.03, 0.05 and 0.07) were successfully synthesized through a facile hydrothermal method followed by calcination. The evolution in microstructure as well as electrochemical performance of the modified samples with the doped Ca content were investigated in details. It was found that modified Li4-xCaxTi5O12 (x = 0.05) exhibited the best electrochemical performances in terms of the highest initial specific discharge capacity (158.55 mA h g−1 at 160 mA g-1), best cycling stability with a retained specific charge capacity of 104.76 mAh g−1 at 160 mA g-1 after 100 cycles and rating capability with a retained rate of 64.55 %/88.56 % with the current density drastically increased 1600 mA⋅ g−1 and dropped to initial value. The excessive introduction of Ca (x = 0.07) caused the sharp decrease in electrochemical performance due to the formation of inert and insulating CaCO3. Li4-xCaxTi5O12 (x = 0.05) also demonstrated a lowest ohmic resistance (2.35 Ω) and charge transfer resistance (95.42 Ω).
Databáze: OpenAIRE
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