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钠离子电池负极材料最新研究进展-超强异质结的构筑促进钠离子快速传输
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近期，湖南大学材料学院在Journal of Chemistry Materials A上报道了通过整合具有不同能带差的两种活性物质，将两者构筑成异质结构用作钠离子的存储。研究证明，两种活性物质的能带差异越大，所构筑异质结构内电场越强，越能促进钠离子在材料内部的快速传输。该材料在50A/g的电流密度下，容量仍高达235mAh/g，电池能在17s内完成充放电过程。该工作为构筑快速离子传输的负极材料提供了有效的设计思路。 Title: Fabrication of strong internal electric field ZnS/Fe9S10 heterostructures for highly efficient sodium ion storage Journal: J. Mater. Chem. A, 2019, DOI: 10.1039/C9TA02388G Abstract: The interfacial properties of electrode materials have a crucial impact on enhancing their charge transfer. However, a deep understanding of this aspect remains elusive. Herein, we provide an effective strategy to manipulate the internal electric field (E-field) of metal sulfide heterostructures to accelerate their Na-ion storage kinetics. To prove this concept, we selected ZnS and Fe9S10 with a large energy bandgap difference as model components with the aim to build a strong E-field at their hetero-interfaces, thus fabricating stable ZnS/Fe9S10 heterostructures for high-rate and high-capacity sodium ion storage. The emerging built-in E-field in the carbon-coated ZnS/Fe9S10 heterostructures can accelerate ion/electron migration rates and facilitate charge transfer behavior by the internal driving force of the E-field, guaranteeing enhanced reaction reversibility and sodium storage kinetics. These engineered heterostructures deliver a high initial coulombic efficiency of 85.3%, a high reversible capacity of 636 mA h g−1 at 500 mA g−1 and stable cycling performance. In particular, they also exhibit superior rate capacities of 295 mA h g−1 at 30 A g−1 and 235 mA h g−1 at 50 A g−1, indicating that this battery can be fully charged within 17 s. More importantly, this design concept can be extended to construct other heterostructures, such as ZnS and Sn2S3. |
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2019-05-22 11:11:25, 1.73 M
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