Grain-Boundary-Enriched SEI

12× lifespan in anode-less K cells

A graphene-based current collector modification renders an inorganic SEI with enriched grain boundaries, boosting interfacial stability and mechanical strength.

Lian, Xueyu · Yuzhu, Wu · Li, Jiayi · Xuzhi, Zhang · Ju, Zhijin · Ziang, Chen · Qian, Liu · Xu, Rong · Song, Yuqing · Cheng, Tao · Tao, Xinyong · Sun, Jingyu

Advanced Functional Materials 2026

Specifications

Symmetric cell cycling lifespan

{'zh': '10000', 'en': '10000'} h

Cycling lifespan increase

{'zh': '12', 'en': '12'} -fold

Capacity output improvement

{'zh': '3.4', 'en': '3.4'} -fold

Advantages

12-fold longer cycling lifespan

The SEI with rich grain boundaries minimizes the consumption of active species during the formation stage, leading to a 12-fold increase in cycling lifespan.

3.4-fold higher capacity output

The minimized consumption of active species also leads to a 3.4-fold improvement in capacity output.

Applications

• Anode-less potassium metal batteries：Boost cycle life and capacity in anode-less K batteries without pre-potassiation.