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鈉離子電池負(fù)極材料最新研究進(jìn)展-超強(qiáng)異質(zhì)結(jié)的構(gòu)筑促進(jìn)鈉離子快速傳輸
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近期，湖南大學(xué)材料學(xué)院在Journal of Chemistry Materials A上報(bào)道了通過整合具有不同能帶差的兩種活性物質(zhì)，將兩者構(gòu)筑成異質(zhì)結(jié)構(gòu)用作鈉離子的存儲(chǔ)。研究證明，兩種活性物質(zhì)的能帶差異越大，所構(gòu)筑異質(zhì)結(jié)構(gòu)內(nèi)電場越強(qiáng)，越能促進(jìn)鈉離子在材料內(nèi)部的快速傳輸。該材料在50A/g的電流密度下，容量仍高達(dá)235mAh/g，電池能在17s內(nèi)完成充放電過程。該工作為構(gòu)筑快速離子傳輸?shù)呢?fù)極材料提供了有效的設(shè)計(jì)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. Link: https://pubs.rsc.org/en/content/ ... unauth#!divAbstract |
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本內(nèi)容由用戶自主發(fā)布，如果其內(nèi)容涉及到知識(shí)產(chǎn)權(quán)問題，其責(zé)任在于用戶本人，如對(duì)版權(quán)有異議，請聯(lián)系郵箱：xiaomuchong@tal.com - 附件 1 : J_Mater_Chem_A_20190429–strong_internal_electric_field_ZnS-Fe9S10_heterostructures.pdf
2019-05-01 01:20:15, 1.73 M
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