Ru-和 Cl-共掺杂 Li3V2(PO4)3 在宽温度范围内具有增强的锂离子电池性能,Small

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Ru-和 Cl-共掺杂 Li3V2(PO4)3 在宽温度范围内具有增强的锂离子电池性能
Small ( IF 13.0 ) Pub Date : 2022-06-24 , DOI: 10.1002/smll.202202151
Minxia Liang ₁ , Longgang Li ₂ , Xiang Cui ₁ , Shuo Qi ₁ , Lei Wang ₁ , Hanghang Dong ₁ , Xianfei Chen ₂ , Yong Wang ₁ , Shuangqiang Chen ₁ , Guoxiu Wang ₃

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Li ₃ V ₂ (PO ₄ ) ₃ (LVP)是一种很有前途的锂离子电池正极材料，尤其是在宽温度范围内使用时，由于其高的固有离子迁移率和理论容量。在此，合成了涂覆有/没有氮掺杂碳(NC)层的Ru-和Cl-共掺杂的Li ₃ V ₂ (PO ₄ ) ₃ (LVP-Ru _x -Cl ₃_{x )。}其中，优化后的样品（LVP-Ru _0.05 -Cl _0.15@NC）在室温和极端温度（-40、25 和 60 °C）下均表现出色，表明温度适应性。它实现了有趣的容量（-40 °C 时为 49 mAh g ^-1，25 °C 时为 128 mAh g ^-1，60 °C 时为 123 mAh g ^-1，均在 0.5 C 时），循环寿命长（94% 容量）在 25°C 和 5°C 下 2000 次循环后保持）和高倍率能力（高达 20°C）。LVP-Ru _0.05 -Cl _{0.15的结构演化特征及容量损失机制}在氧化还原反应期间，在不同温度（-10、25 和 60 °C）下使用原位 X 射线衍射 (XRD) 进一步研究@NC。理论计算表明，Ru-和Cl-共掺杂可以通过降低其带隙能量和降低锂离子扩散的能垒来大大提高LVP的本征扩散系数。在“全天候”条件下，双元素共掺杂策略对于提高电化学性能至关重要。

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Ru- and Cl-Codoped Li3V2(PO4)3 with Enhanced Performance for Lithium-Ion Batteries in a Wide Temperature Range

Li₃V₂(PO₄)₃ (LVP) is a promising cathode material for lithium-ion batteries, especially when used in a wide temperature range, due to its high intrinsic ionic mobility and theoretical capacity. Herein, Ru- and Cl-codoped Li₃V₂(PO₄)₃ (LVP-Ru_x-Cl₃_x) coated with/without a nitrogen-doped carbon (NC) layer are synthesized. Among them, the optimized sample (LVP-Ru_0.05-Cl_0.15@NC) delivers remarkable performances at both room temperature and extreme temperatures (−40, 25, and 60 °C), indicating temperature adaptability. It achieves intriguing capacities (49 mAh g⁻¹ at −40 °C, 128 mAh g⁻¹ at 25 °C, and 123 mAh g⁻¹ at 60 °C, all at 0.5 C), long cycle life (94% capacity retention after 2000 cycles at 25 °C and 5 C), and high-rate capabilities (up to 20 C). The structural evolution features and capacity loss mechanisms of LVP-Ru_0.05-Cl_0.15@NC are further investigated using in situ X-ray diffraction (XRD) at different temperatures (−10, 25, and 60 °C) during redox reactions. Theoretical calculations elucidate that Ru- and Cl-codoping can greatly improve the intrinsic diffusion coefficient of LVP by reducing its bandgap energy and lowering the energy barrier of lithium-ion diffusion. In “all-weather” conditions, the dual-element co-doping strategy is critical for increasing electrochemical performance.

更新日期：2022-06-24

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