轻松制备联锁 Fe2O3/MOF 复合材料以提高锂离子电池的倍率和循环性能,Energy & Fuels

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轻松制备联锁 Fe2O3/MOF 复合材料以提高锂离子电池的倍率和循环性能
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-06-12 , DOI: 10.1021/acs.energyfuels.3c00801
Lei Su ₁ , Yingnan Hua _{2,

3} , Fan Yang ₁ , Zhi Chen _{2,

3} , Zhichun Yang ₁ , Xinmiao Liang ₂ , Cheng Zhang ₄ , Gang Liu ₃ , Bing Chen ₂

Affiliation

由于高比容量、环境友好和成本效益的优点，氧化铁（Fe ₂ O ₃）正在成为锂离子电池（LIB）的潜在负极替代品。_{然而，由于循环稳定性和倍率性能不理想，Fe 2} O ₃需要进一步改性才能达到实际要求。本研究采用Fe ₂ O ₃基复合阳极(即Fe ₂ O ₃为了追求增强的电化学性能，设计并合成了具有互锁结构的@HA-Fe-BPDC）。得益于多孔结构、丰富的活性位点和良好的体积膨胀耐受性，所制备的电极表现出显着提高的倍率性能、优异的比容量和令人满意的可逆性。通常，Fe ₂ O ₃ @HA-Fe-BPDC 负极在 0.1 A g ^{–1下提供了 708 mAh g}^–1的优异比容量，并在 1 A g –1 下^{保持在 332 mAh g}^–1的高水平，与 Fe ₂ O ₃相比，倍率性能显着提高。^{此外，在 600 次充电/放电循环后，在 1 A g –1}下实现了出色的容量保持率 (95.4%) 。基于简单共沉淀法制备Fe ₂ O ₃和MOF复合电极的策略为开发高性能LIB阳极提供了可行的技术。

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Facile Preparation of Interlocked Fe2O3/MOF Composite for Boosted Rate and Cycle Performance of Lithium-Ion Batteries

Iron oxide (Fe₂O₃) is emerging as a potential anode alternative for lithium-ion batteries (LIBs) due to the merits of high specific capacity, environmental friendliness, and cost-effectiveness. However, trapped by unsatisfactory cycling stability and rate capability, further modification is needed for Fe₂O₃ to achieve practical requirements. In this study, a Fe₂O₃-based composite anode (namely Fe₂O₃@HA-Fe-BPDC) with interlocked structure was designed and synthesized for pursuing enhanced electrochemical properties. Benefiting from the porous structure, abundant active sites, and good tolerance to volume expansion, the as-prepared electrode exhibits significantly boosted rate capability, excellent specific capacity, and satisfactory reversibility. Typically, the Fe₂O₃@HA-Fe-BPDC anode provided an excellent specific capacity of 708 mAh g^–1 at 0.1 A g^–1 and remained at a high level of 332 mAh g^–1 at 1 A g^–1, delivering significantly improved rate performance than Fe₂O₃. Additionally, outstanding capacity retention (95.4%) was achieved at 1 A g^–1 after 600 charge/discharge cycles. The strategy based on the facile coprecipitation for fabricating Fe₂O₃ and MOF composite electrodes provides a feasible technique to develop a high-performance anode for LIBs.

更新日期：2023-06-12

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