High Performance Li4Ti5O12-Si Composite Anodes for Li-Ion BatteriesReportar como inadecuado


High Performance Li4Ti5O12-Si Composite Anodes for Li-Ion Batteries


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Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA





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Academic Editor: Xueliang Andy Sun

Abstract Improving the energy capacity of spinel Li4Ti5O12 LTO is very important to utilize it as a high-performance Li-ion battery LIB electrode. In this work, LTO-Si composites with different weight ratios were prepared and tested as anodes. The anodic and cathodic peaks from both LTO and silicon were apparent in the composites, indicating that each component was active upon Li+ insertion and extraction. The composites with higher Si contents LTO:Si = 35:35 exhibited superior specific capacity 1004 mAh·g−1 at lower current densities 0.22 A·g−1 but the capacity deteriorated at higher current densities. On the other hand, the electrodes with moderate Si contents LTO:Si = 50:20 were able to deliver stable capacity 100 mAh·g−1 with good cycling performance, even at a very high current density of 7 A·g−1. The improvement in specific capacity and rate performance was a direct result of the synergy between LTO and Si; the former can alleviate the stresses from volumetric changes in Si upon cycling, while Si can add to the capacity of the composite. Therefore, it has been demonstrated that the addition of Si and concentration optimization is an easy yet an effective way to produce high performance LTO-based electrodes for lithium-ion batteries. View Full-Text

Keywords: : lithium titanate; silicon; rate capability; energy capacity; composite : lithium titanate; silicon; rate capability; energy capacity; composite





Autor: Chunhui Chen, Richa Agrawal and Chunlei Wang *

Fuente: http://mdpi.com/



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