Layered Perovskite Lithium Yttrium Titanate as a Low-Potential and Ultrahigh-Rate Anode for Lithium-Ion Batteries,Advanced Energy Materials

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Layered Perovskite Lithium Yttrium Titanate as a Low-Potential and Ultrahigh-Rate Anode for Lithium-Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-06-11 , DOI: 10.1002/aenm.202200922
Yun Zhang ₁ , Jun Huang ₁ , Nagahiro Saito ₂ , Xiaolong Yang ₃ , Zhengxi Zhang _{1,

4} , Li Yang _{1,

4,

5} , Shin‐ichi Hirano ₅

Affiliation

Graphite, as the dominant anode for commercial lithium-ion batteries, features sluggish electrochemical kinetics and low potential close to lithium deposition, leading to poor rate capability and safety issues. Although titanium-based oxides have received considerable attention, each alternative demonstrates unsatisfactory trade-offs between capacity, operating potential, rate capability, and lifespan. Here, submicrometer-sized lithium yttrium titanate (LYTO) is synthesized through facile sol–gel and ion-exchange reactions. With an average operating potential of 0.3 V versus Li⁺/Li, the LYTO anode demonstrates a high specific capacity of 236 mAh g^–1 and durable cycling performance of 98% capacity retention after 3000 cycles. Impressively, without additional modification, a high-rate capability is achieved under a current density range from 0.5 C to 100 C (1 C = 200 mA g^–1), e.g., delivering 112 and 87 mAh g^–1 at 60 C and 100 C, respectively. Comprehensive characterizations and computational simulations reveal reversible solid-solution reactions occurring in the LYTO framework with little lattice change and fast 2D Li⁺ mobility achieved due to a low diffusion energy barrier. After incorporation with a LiFePO₄ cathode, the energy density of the as-fabricated full cell reaches 2.4 times that of Li₄Ti₅O₁₂/LiFePO₄ full cell. The double characteristics of LYTO provide a fresh identification for high-performance anodes.

中文翻译：

层状钙钛矿钛酸钇锂作为锂离子电池的低电势和超高速阳极

石墨作为商用锂离子电池的主要负极材料，其电化学动力学缓慢、接近锂沉积的电位低，导致倍率性能差和安全问题。尽管钛基氧化物受到了相当多的关注，但每种替代方案都表现出在容量、操作潜力、倍率能力和寿命之间的不令人满意的权衡。在这里，亚微米级钛酸钇锂 (LYTO) 是通过简单的溶胶-凝胶和离子交换反应合成的。相对于 Li ^{+ /Li，LYTO 负极的平均工作电位为 0.3 V，表现出 236 mAh g}^–1的高比容量3000 次循环后具有 98% 容量保持率的持久循环性能。^{令人印象深刻的是，无需额外修改，即可在 0.5 C 至 100 C (1 C = 200 mA g –1} )的电流密度范围内实现高倍率能力，例如，在 60 C 和 100 C时提供 112 和 87 mAh g ^–1 C，分别。综合表征和计算模拟揭示了在 LYTO 框架中发生的可逆固溶体反应，由于低扩散能垒，晶格变化很小，并且实现了快速的 2D Li ^{+迁移率。}加入LiFePO ₄正极后，制备的全电池能量密度达到Li ₄ Ti ₅ O _12的2.4倍/LiFePO ₄全电池。LYTO的双重特性为高性能阳极提供了新的识别。

更新日期：2022-06-11

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