Li1.3Al0.3Ti1.7(PO4)3 和锂金属之间的工程铁电中间层用于在室温下稳定运行的固态电池,Energy & Environmental Materials

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Li1.3Al0.3Ti1.7(PO4)3 和锂金属之间的工程铁电中间层用于在室温下稳定运行的固态电池
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2022-09-27 , DOI: 10.1002/eem2.12531
Tian Gu _{1,

2} , Likun Chen _{1,

2} , Yan‐Fei Huang _{1,

3} , Jiabin Ma _{1,

2} , Peiran Shi _{1,

2} , Jie Biao _{1,

2} , Ming Liu ₁ , Wei Lv ₁ , Yan‐Bing He ₁

Affiliation

_{Li 1.3} Al _0.3 Ti _1.7 (PO ₄ ) ₃ (LATP)与锂(Li)阳极之间接触不良和副反应导致锂镀层不均匀和界面阻抗较高，极大地阻碍了LATP在高能量密度固体中的实际应用-态锂金属电池。在这项工作中，在LATP和锂金属之间构建了多功能铁电BaTiO ₃ (BTO)/聚(偏氟乙烯-co-三氟乙烯-co-氯三氟乙烯)(P[VDF-TrFE-CTFE])复合中间层(B-TERB)负极，不仅抑制了锂枝晶的生长，而且提高了界面稳定性，保持了紧密的界面接触，使界面电阻显着降低了两个数量级。B-TERB中间层产生均匀的电场，诱导均匀横向的锂沉积，从而避免了锂金属和LATP之间的副反应，实现了优异的界面稳定性。结果，Li/LATP@B-TERB/Li对称电池可以在0.2 mA cm ^-2下稳定循环1800小时，在0.5 mA cm ^-2下稳定循环1000小时。固态LiFePO ₄ /LATP@B-TERB/Li全电池在0.5 C和室温下也表现出优异的循环性能，可循环250次。这项工作提出了一种在陶瓷电解质和锂金属之间设计多功能铁电中间层的新策略，以实现稳定的室温循环性能。

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Engineering Ferroelectric Interlayer between Li1.3Al0.3Ti1.7(PO4)3 and Lithium Metal for Stable Solid-State Batteries Operating at Room Temperature

The poor contact and side reactions between Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) and lithium (Li) anode cause uneven Li plating and high interfacial impendence, which greatly hinder the practical application of LATP in high-energy density solid-state Li metal batteries. In this work, a multifunctional ferroelectric BaTiO₃ (BTO)/poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) (P[VDF-TrFE-CTFE]) composite interlayer (B-TERB) is constructed between LATP and Li metal anode, which not only suppresses the Li dendrite growth, but also improves the interfacial stability and maintains the intimate interfacial contact to significantly decrease the interfacial resistance by two orders of magnitude. The B-TERB interlayer generates a uniform electric field to induce a uniform and lateral Li deposition, and therefore avoids the side reactions between Li metal and LATP achieving excellent interface stability. As a result, the Li/LATP@B-TERB/Li symmetrical batteries can stably cycle for 1800 h at 0.2 mA cm⁻² and 1000 h at 0.5 mA cm⁻². The solid-state LiFePO₄/LATP@B-TERB/Li full batteries also exhibit excellent cycle performance for 250 cycles at 0.5 C and room temperature. This work proposes a novel strategy to design multifunctional ferroelectric interlayer between ceramic electrolytes and Li metal to enable stable room-temperature cycling performance.

更新日期：2022-09-27

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