Lithium metal is widely recognized as an ideal anode material due to its high specific capacity and low redox potential. However, challenges such as severe lithium dendrite growth have significantly impeded its practical applications. Herein, we introduce a BaTiO3 (BTO) ferroelectric thin film into the lithium anode. During the charge/discharge cycles, the BTO film generates a micro-potential in the direction opposite to the applied electric field, owing to its spontaneous polarization. The micro-potential effectively reduces the electric field gradient, thereby suppressing inhomogeneous nucleation and the growth of lithium dendrites. Consequently, the incorporation of the BTO ferroelectric thin film significantly enhances the cycling performance of the batteries. The half cells demonstrate stable operation after more than 100 cycles at high capacity of 4 mAh cm−2. Furthermore, the LiFePO4 (LFP) full cell delivers a specific capacity of 146.6 mAh g−1 after 300 cycles. This work demonstrates a promising strategy for the development of lithium batteries with improved longevity and enhanced capacity.

中文翻译：

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BaTiO3 薄膜中自发极化的微电位增强了锂负极稳定性


金属锂因其高比容量和低氧化还原电位而被广泛认为是理想的负极材料。然而，锂枝晶严重生长等挑战严重阻碍了其实际应用。在本文中，我们在锂负极中引入了 BaTiO3 （BTO） 铁电薄膜。在充电/放电循环期间，由于其自发极化，BTO 薄膜在与施加电场相反的方向上产生微电位。微电位有效地降低了电场梯度，从而抑制了不均匀的成核和锂枝晶的生长。因此，BTO 铁电薄膜的加入显着提高了电池的循环性能。半电池在 4 mAh cm-2 的高容量下经过 100 多次循环后表现出稳定的运行。此外，LiFePO4 （LFP） 全电池在 146.6 次循环后可提供 100 mAh g-1 的比容量。这项工作为开发具有更高寿命和增强容量的锂电池提供了一种有前途的策略。