<br>具有混合晶体结构的 W7Nb4O31 纳米棒：一种快速且稳定充电的水系锂离子电池负极材料,Advanced Functional Materials

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具有混合晶体结构的 W7Nb4O31 纳米棒：一种快速且稳定充电的水系锂离子电池负极材料
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-03-04 , DOI: 10.1002/adfm.202400010
Qiang Yuan ₁ , Xiangzhen Zhu ₂ , Yan Zhao ₁ , Lei Wang ₁ , Yi Lei ₁ , Xuehua Liu ₁ , Chunfu Lin ₁

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水系锂离子电池（ALIB）由于免除了传统锂离子电池的安全问题而引起了广泛的兴趣。尽管ALIB的能量密度有所提高，但由于现有负极材料的Li ⁺ 扩散速度慢，其倍率性能和功率密度仍然较差，且循环稳定性也较差。在这里，首次探索了具有快速稳定充电能力的 W ₇ Nb ₄ O ₃₁ 纳米棒作为 ALIB 的新型阳极材料。该材料拥有不同的四方钨青铜（TTB）结构以及受TTB基质限制的4×4 ReO ₃ 型块体，为Li ⁺ 传输提供丰富的五边形和四边形隧道。这些大尺寸的隧道与大的层间距（≈3.95 Å）相结合，不仅导致极快的Li ⁺ 扩散率，而且在锂化/脱锂过程中单位电池体积变化很小（最大2.1％），从而使LiMn ₂ O ₄ //W ₇ Nb ₄ O ₃₁ 全电池具有优异的倍率50C 与 1C 容量比为 68.3%，超高功率密度为 9854 W kg ^–1 ，循环稳定性极佳，1C/5C/50C 超过 1000/ 时容量保持率为 89.7/66.7/72.0% 10 000/10 000 次循环。这项综合研究表明，W ₇ Nb ₄ O ₃₁ 纳米棒对于快速稳定充电的 ALIB 非常有前景。

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W7Nb4O31 Nanorods with a Mixed Crystal Structure: A Very Fast- and Stable-Charging Anode Material for Aqueous Lithium-Ion Batteries

Aqueous lithium-ion batteries (ALIBs) have attracted extensive interest since the safety problems of traditional lithium-ion batteries are waived. Although the energy density of ALIBs is improved, their rate capability and power density are still poor due to the slow Li⁺ diffusivity of the existing anode materials, and their cyclic stability is also poor. Here, W₇Nb₄O₃₁ nanorods with very fast- and stable-charging capability are explored as a new anode material for ALIBs for the first time. This material owns different tetragonal tungsten bronze (TTB) structures together with 4 × 4 ReO₃-type blocks confined by TTB matrices, allowing abundant pentagonal and quadrangular tunnels for Li⁺ transport. These large-sized tunnels combine with the large interlayer spacing (≈3.95 Å) not only lead to extremely fast Li⁺ diffusivity but also small unit-cell volume variations (maximum 2.1%) during lithiation/delithiation, thereby enabling the LiMn₂O₄//W₇Nb₄O₃₁ full cell to possess excellent rate capability with a 50C versus 1C capacity ratio of 68.3%, ultrahigh power density of 9854 W kg^–1, and superior cyclic stability with capacity retention of 89.7/66.7/72.0% at 1C/5C/50C over 1000/10 000/10 000 cycles. This comprehensive study demonstrates that the W₇Nb₄O₃₁ nanorods are highly promising for fast- and stable-charging ALIBs.

更新日期：2024-03-04

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