Abstract
Lithium (Li) dendrite issue, which is usually caused by inhomogeneous Li nucleation and fragile solid electrolyte interphase (SEI), impedes the further development of high-energy Li metal batteries. However, the integrated construction of a high-stable SEI layer that can regulate uniform nucleation and facilitate fast Li-ion diffusion kinetics for Li metal anode still falls short. Herein, we designed an artificial SEI with hybrid ionic/electronic interphase to regulate Li deposition by in-situ constructing metal Co clusters embedded in LiF matrix. The generated Co and LiF both enable fast Li-ion diffusion kinetics, meanwhile, the lithiophilic properties of Co clusters can serve as Li-ion nucleation sites, thereby contributing to uniform Li nucleation and non-dendritic growth. As a result, a dendrite-free Li deposition with a low overpotential (16.1 mV) is achieved, which enables an extended lifespan over 750 h under strict conditions. The full cells with high-mass-loading LiFePO4 (11.5 mg/cm2) as cathodes exhibit a remarkable rate capacity of 84.1 mAh/g at 5 C and an improved cycling performance with a capacity retention of 96.4% after undergoing 180 cycles.
Published Version
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