近日，韩丹阳同学和尹红老师在锂离子电池领域取得突破性进展！利用硅基材料，他们成功解决了传统锂离子电池面临的能量密度低、循环寿命短等难题。采用碳包覆和预锂化等策略，他们开发出Si/C复合材料，表现出出色的可逆容量和长期循环性能。这一成果为高性能、高稳定性的锂离子电池打下了基础，对电动汽车和便携式电子设备等领域的发展具有重要意义。

The high capacity and low charge potential of Si-based materials have attracted significant attention in recent years, positioning them as promising candidates for lithium-ion batteries (LIBs). However, these materials face challenges such as insufficient conductivity and substantial volumetric expansion. To address these concerns, two strategies have been employed: constructing a carbon coating layer and implementing pre-lithiation. Si nanospheres are dispersed in a precursor solution and subsequently annealed to undergo carbonization, resulting in the formation of Si/C composites. The Si/C anode has been pre-lithiated using a simple electrochemical pre-lithiation method to enhance the initial coulombic efficiency. Specifically, it achieved a reversible capacity of 1018.4 mAh g⁻¹ after 500 cycles at a current density of 0.5 A g⁻¹ for LIBs. Even at a high current density of 5 A g⁻¹, the capacity remained stable at 266.4 mAh g⁻¹ after 500 cycles. Moreover, pre-lithiation significantly improved the coulombic efficiency in the first cycle, increasing it from 64.89 % to 96.18 %. The enhanced performance can be attributed to the carbon coating layer, which improves material conductivity and mitigates volume expansion. Our work demonstrates that the prepared Si/C anode exhibits excellent long-term cycling performance and a high-rate capability. These findings provide valuable insights for developing high-performance LIBs by leveraging the specific structure of Si-based materials.

论文题目：Pre-lithiated silicon/carbon nanosphere anode with enhanced cycling ability and coulombic efficiency for lithium-ion batteries.