Capacity recovery by transient voltage pulse in silicon-anode batteries

• 成果类型: Article
• 署名作者: Yang, Yufei; Biswas, Srija; Xu, Rong; Xiao, Xin; Xu, Xin; Zhang, Pu; Gong, Huaxin; Zheng, Xueli; Peng, Yucan; Li, Junyan; Ai, Huayue; Wu, Yecun; Ye, Yusheng; Gao, Xin; Serrao, Chad; Zhang, Wenbo; Sayavong, Philaphon; Huang, Zhuojun; Chen, Zhouyi; Cui, Yi; Vila, Rafael A.; Boyle, David T.; Cui, Yi
• 署名单位: Stanford University; Arizona State University; Stanford University; Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory; Stanford University; Stanford University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10154
• DOI: 10.1126/science.adn1749
• 发表日期: 2024-10-18
• 页码: 322-327
• 关键词: lithium metal batteries; high-energy; DESIGN; ion; dielectrophoresis; interfaces; SEPARATION; GROWTH

摘要

In the quest for high-capacity battery electrodes, addressing capacity loss attributed to isolated active materials remains a challenge. 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.