Abstract

Obtaining a high specific capacity of Sn-Ti composite anode for lithium-ion batteries while maintaining stable cycle is a key issue to be solved. Research on using reasonable compensation treatment is of importance for solving the problem. In this work, the Sn-Ti-C nanofibers are prepared by electrospinning and using deep cryogenic treatment as supplementary treatment and then carbonization. After the deep cryogenic treatment, the abundant grain boundaries are introduced into Sn particles, which more easily combine with Ti to form Sn-Ti particles in the process of high-temperature carbonization. The Sn-Ti particles inside and outside the grooved nanofibers with low Ti content inhibits the volume expansion of Sn during the cycles and maintains the high specific capacity for Sn alloy. For the sample as the anode, the capacity can remain at 557 mAh g⁻¹ and the capacity retention of 98.7% over 100 cycles. The improvement of electrochemical performance can be simply implemented by deep cryogenic treatment, which provides reliable theoretical and practical data for the preparation of Sn-Ti composite anode for lithium-ion batteries.

中文翻译：

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深低温处理提高锂离子电池Sn-Ti-C纳米纤维负极的性能

摘要

在保持稳定循环的同时获得高比容量的锂离子电池用Sn-Ti复合负极是要解决的关键问题。对于采用合理的补偿方法进行研究对于解决这一问题具有重要意义。在这项工作中，Sn-Ti-C纳米纤维是通过静电纺丝并使用深低温处理作为辅助处理，然后碳化而制备的。经过深低温处理后，大量的晶界被引入到Sn颗粒中，在高温碳化过程中，它们更容易与Ti结合形成Sn-Ti颗粒。具有低Ti含量的带槽纳米纤维内部和外部的Sn-Ti颗粒在循环过程中抑制了Sn的体积膨胀，并保持了Sn合金的高比容量。对于作为阳极的样品，容量可以保持在557 mAh g^-1，在100个循环中的容量保持率为98.7％。通过深低温处理可以简单地实现电化学性能的改善，这为制备锂离子电池用Sn-Ti复合阳极提供了可靠的理论和实践数据。