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[交流] Capacity recovery by transient voltage pulse in silicon-anode batteries

Capacity recovery by transient voltage pulse in silicon-anode batteries

硅阳极电池瞬态电压脉冲的容量恢复

▲ 作者:YUFEI YANG, SRIJA BISWAS, RONG XU et al.

▲链接:

https://www.science.org/doi/10.1126/science.adn1749

▲摘要:

我们开发了一种方法来回收硅电极中隔离的活性材料,并使用电压脉冲将隔离的锂硅(LixSi)颗粒重新连接到导电网络中。通过使用5秒脉冲,我们在Li-Si和Si–磷酸铁锂(Si-LFP)电池中实现了30%以上的容量恢复。

通过多个脉冲维持和复制恢复的电容量,并能提供恒定的容量优势。我们验证了恢复机制是中性分离的LixSi粒子在局部非均匀电场下的运动,这种现象被称为介电电泳。

▲ Abstract:

We developed an approach to substantially recover the isolated active materials in silicon electrodes and used a voltage pulse to reconnect the isolated lithium-silicon (LixSi) particles back to the conductive network. Using a 5-second pulse, we achieved >30% of capacity recovery in both Li-Si and Si–lithium iron phosphate (Si-LFP) batteries. The recovered capacity sustains and replicates through multiple pulses, providing a constant capacity advantage. We validated the recovery mechanism as the movement of the neutral isolated LixSi particles under a localized nonuniform electric field, a phenomenon known as dielectrophoresis.
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