Uniform Distribution of Li Deposition and High Utilization of Transferred Metallic Li Achieved by an Unusual Free-Standing Skeleton for High-Performance Li Metal Batteries

Abstract

Due to the unavoidable generation of lithium (Li) dendrites, stable and sustainable Li metal batteries are still facing great difficulties in practical applications. Herein, a free-standing porous copper framework decorated with Sn nanoparticles (PCF@Sn) is proposed for the uniformly induced and dispersed Li deposition. Benefiting from the formation of a lithiophilic Li-Sn alloy, PCF@Sn exhibits a homogeneous and ordered distribution of the deposited Li metal, which is manifested by in situ optical or microscopic images. In the test of Coulombic efficiency, a controlled incomplete delithiation behavior can further promote the prevention of Li dendrites and structure deterioration, realizing a longer and more stable cycling performance. In addition, a higher utilization of the deposited Li metal can also be achieved in the Li plating/stripping process. As a result, a symmetric cell based on PCF@Sn@Li electrodes delivers an extremely stable cycling performance of 1200 h at 1 mA cm −2 and rate capability. For full cell tests, PCF@Sn@Li anodes show excellent reversible capacities, superior capacity retentions, and excellent rate performance when coupled with LiFePO 4 or sulfur cathodes.

Single‐Atom Lithiophilic Sites Confined within Ordered Porous Carbon for Ultrastable Lithium Metal Anodes

“…During the test, the small fluctuation of the curves might be caused by the formation of stable interface and voltage polarizations. [ 25,31,37 ] When current density is returned to 2 mA cm −2 , the voltage hysteresis can return to the original value, confirming the excellent stability of Li metal anode with NOMC‐Ni as the host.…”

“…As depicted in polarizations. [25,31,37] When current density is returned to 2 mA cm −2 , the voltage hysteresis can return to the original value, confirming the excellent stability of Li metal anode with NOMC-Ni as the host. NOMC-Ni/Li||LFP full cell was assembled to evaluate the potential practical application of NOMC-Ni.…”

Nanosecond Pulsed Laser‐Assisted Deposition to Construct a 3D Quasi‐Gradient Lithiophilic Skeleton for Stable Lithium Metal Anodes

“…Notably, the LAD‐SSC@CF|Li half‐cells show low initial CE values at different current densities, which may be a result of the incomplete de‐embedding behavior of the Li–Sn alloy. [ 28 ] The morphological characterizations of the electrodes after cycling also demonstrate the cycle stability of cell (Figure S10, Supporting Information). The LAD‐SSC@CF|Li half‐cell exhibits a uniform and dendrite‐free Li deposition morphology after 20 cycles at 1 mA cm −2 with 1 mAh cm −2 .…”

Zincophilic Sn sites induced the local ion enrichment for compact and homogenous growth of Zn biscuits in long-life Zn metal batteries

“…A uniform and thin Sn layer offers the skeleton good zincophilicity, which is benecial to enhancing the performance of continuous Zn plating/stripping and improving the cycling stability of the Zn metal anode. 32 To prove the positive effect of the Sn decoration interface, related electrochemical tests were performed. Fig.…”