Embedding alloying sites in a lithiated polymer matrix as a stable interphase of lithium electrodes.

Designing a stable interphase with lithium (Li) dendrite suppressing ability is a surging demand for high-energy-density Li metal batteries (LMBs). Here, a hybrid inorganic-organic interphase is achieved on a Li anode, on which the nanoscale phase separation between antimony nucleation sites and an interconnected Li + conducting polymer matrix endows the Li growing behavior with high uniformity and stability, resulting in a long lifespan of LMB over 500 cycles with a practical capacity of ∼2.5 mA h cm -2 .