With the rapid increase in lithium (Li)-ion battery applications, there is growing interest in the circulation of large quantities of spent batteries. However, existing recycling systems require not only several processes for recycling itself but also remanufacturing processes, which require increased energy consumption. Here, a recovery reagent injection is proposed for regenerating spent batteries. For capacity-degraded batteries with reduced electrons and carrier Li⁺ ions, Li-naphthalene radical anions with controlled potential based on solvent dielectric effects are injected, selectively providing both electrons and carrier Li ions to the cathode and resulting in capacity recovery without degradation with cycles. Furthermore, the integration of constant-voltage treatment has successfully demonstrated a high-capacity recovery effect in 4 Ah-class practical batteries. The proposed method is expected to achieve the shortest route in battery regeneration and provide new options for circular battery systems.

随着锂离子电池应用的迅速增加，人们对大量废旧电池的循环利用越来越感兴趣。然而，现有的回收系统不仅需要多个回收过程，还需要再制造过程，这需要增加能源消耗。这里，建议注射回收试剂来再生废电池。对于电子和载流子Li ⁺离子减少的容量退化电池，注入基于溶剂介电效应的具有受控电位的锂萘自由基阴离子，选择性地向正极提供电子和载流子锂离子，从而导致容量恢复而不会随着循环而退化。此外，集成恒压处理已在4Ah级实用电池中成功展示了高容量恢复效果。该方法有望实现电池再生的最短路径，为循环电池系统提供新的选择。