Effect of Carbon Additives on the Electrochemical Performance of Li 4 Ti 5 O 12 /C Anodes

Irina Stenina, Ruslan Shaydullin, Tatiana Kulova, Anna Kuz’mina, Nataliya Tabachkova and Andrey Yaroslavtsev
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Irina Stenina: Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky prospekt 31, 119991 Moscow, Russia
Ruslan Shaydullin: Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky prospekt 31, 119991 Moscow, Russia
Tatiana Kulova: Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prospekt 31-4, 119071 Moscow, Russia
Anna Kuz’mina: Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky prospekt 31-4, 119071 Moscow, Russia
Nataliya Tabachkova: Prokhorov General Physics Institute of the Russian Academy of Sciences, 38, Vavilov Str., 119991 Moscow, Russia
Andrey Yaroslavtsev: Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky prospekt 31, 119991 Moscow, Russia

Energies, 2020, vol. 13, issue 15, 1-15

Abstract: The Li 4 Ti 5 O 12 /C composites were prepared by a hydrothermal method with in situ carbon addition. The influence of the morphology and content of various carbon materials (conductive carbon black, mesoporous carbon G_157M, and carbon replicas) on the electrochemical performance of the Li 4 Ti 5 O 12 /C composites was investigated. The obtained composites were characterized using X-ray diffraction, scanning electron microsopy, high-resolution transmission electron microscopy, thermogravimetric analysis, Raman spectroscopy, and N 2 sorption-desorption isotherms. Morphology of the Li 4 Ti 5 O 12 /C composites depends on the carbon matrix used, while both morphology and the amount of carbon material have a great impact on the rate capability and cycling stability of the obtained composites. At low current densities, the Li 4 Ti 5 O 12 /C composite with 5 wt.% G_157M exhibits the highest discharge capacity, while at high charge-discharge rates, the Li 4 Ti 5 O 12 /carbon black composites show the best electrochemical performance. Thus, at ~0.1C, 5C, and 18C rates, the discharge capacities of the obtained Li 4 Ti 5 O 12 /C composites are 175, 120, and 70 mAh/g for G_157M, 165, 126, and 78 mAh/g for carbon replicas, and 173, 128, and 93 mAh/g for carbon black. After 100 cycles, their capacity retention is no less than 95%, suggesting their promising application perspective.

Keywords: lithium ion battery; Li 4 Ti 5 O 12; mesoporous carbon; carbon replica (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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