青岛科技大学  English 
张忠华
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副教授 硕士生导师  

教师拼音名称:zhangzhonghua

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所在单位:新能源材料与器件教研室

学历:博士研究生

办公地点:材料学院楼215A

性别:男

联系方式:15092410550

学位:工学博士

职称:副教授

毕业院校:中国科学院大学

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材料科学与工程其他专业

材料学

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2023-09-15 2023 年度山东省优秀研究生导师

2022-12-30 2022年山东省优秀硕士学位论文指导教师

2022-03-01 2021年度校级先进工作者

2020-06-01 2019年度校级先进工作者

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Immobilizing and boosting lithium polyselenide conversion via a WSe2/WO2 heterostructure engineering strategy for lithium-selenium batteries

关键字:HIERARCHICAL POROUS CARBON; ION DIFFUSION; SEPARATOR

摘要:Crystalline selenium, characterized by higher electronic conductivity and volumetric capacity, represents one of the most promising cathode materials for next-generation battery technologies. However, the notorious lithium polyselenide shuttle effects yield formidable challenges, causing overcharge problems and unsatisfactory cycle performances. In this work, a nanosheet on nanorod WSe2/WO2 heterostructure was firstly developed as a proof of concept to immobilize and catalyze the soluble lithium polyselenides species. Through an in situ selenization process, the W5O14-ethylenediamine nanorod precursor was transformed to the WSe2/WO2 heterostructure, which was composed of long WO2 nanorods and WSe2 nanosheets. A combination of visual adsorption/permeation experiments, Li2Se electrochemical deposition tests, and theoretical calculations unraveled the strong chemical anchoring and efficient re-utilization toward soluble Li2Se6 and Li2Se4 species on the as-designed WSe2/WO2 heterostructure, which can originate from the bridge-shaped interfacial bonding structure. As anticipated, Li-Se batteries based on WSe2/WO2 heterostructure-modified separator exhibited dramatically improved overcharge property (overcharge capacity is 28.3 mA h g(-1), only 73.7% of that with pristine PP separator) and cycle performances (about 1.58 times higher than that with pristine PP separator).

卷号:11

期号:7

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