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High-power lithium ion batteries based on preorganized necklace type Li4Ti5O12/VACNT nano-composites

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Pampel,  Jonas
Tim Fellinger, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Pawlitzek, F., Pampel, J., Schmuck, M., Althues, H., Schumm, B., & Kaskel, S. (2016). High-power lithium ion batteries based on preorganized necklace type Li4Ti5O12/VACNT nano-composites. Journal of Power Sources, 325, 1-6. doi:10.1016/j.jpowsour.2016.06.016.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-E5B6-C
Abstract
Li4Ti5O12 as anode material for high power Li+-ion batteries is very promising due to its unique electronic properties. However, the lack of electronic conductivity as well as the low Li+-ion diffusion coefficient are major drawbacks in achieving high power densities. In this work, therefore, we prepared a nano-composite consisting of vertically aligned carbon nanotube arrays decorated with in-situ grown necklace type Li4Ti5O12 nanoparticles. Owing to this structure the electrodes exhibit outstanding rate performances with specific capacities of 110 mAh g−1 up to 300C and cycling performance with high capacity retention of 97 after 500 cycles at 10C. Thus, the combination of short Li+-ion diffusion distances within Li4Ti5O12 particles, remarkable electronic conductivity by carbon nanotubes directly grown on the current collector as well as a high contact surface area due to an open pore geometry is essential in achieving high power Li4Ti5O12 anodes.