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導電氮化物改性氧化鎢催化劑提升鋰硫電池電化學性能
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江西理工大學 材料科學與工程學院

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國家自然科學基金(22179055),江西省科技廳項目(JXSQ2019201037, 20212BDH81013)


Conductive nitride-modified tungsten oxide catalyst improves electrochemical performance of lithium-sulfur batteries
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National Natural Science Foundation of China (22179055), the Department of Science and Technology of Jiangxi Province (JXSQ2019201037 and 20212BDH81013)

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    摘要:

    實驗通過浮動催化CVD法在制備碳納米管(CNTs)堆疊成膜過程中噴灑前驅(qū)體WCl6乙醇溶液,自然風干成膜,然后將膜水熱并煅燒即可得到WO2.9-W2N/CNTs復(fù)合膜。W2N可改善WO3的導電性, WO2.9與WO3比較,其氧缺陷可為Li2S沉積提供更多活性位點,WO2.9-W2N還可與多硫化物(LiPSs)形成Li-O、Li-N鍵,使基體對LiPSs的化學吸附與錨定增強。以復(fù)合膜為正極的鋰硫電池在0.2 C倍率下500次循環(huán)后,放電比容量依然保持大于850 mAh g-1,說明合成的WO2.9-W2N對電池電化學反應(yīng)時的催化效果明顯。

    Abstract:

    In this study, WO2.9-W2N can be obtained by spraying the precursor during the preparation of carbon nanotube films (CNTs), followed by hydrothermal treatment and calcination. The use of W2N can improve the poor conductivity of WO3. In addition, the oxygen vacancies can be caused by WO2.9 that provide more active sites for the deposition of Li2S, and form Li-O with polysulfides (LiPSs), Li-N bond. The results demonstrate the chemical adsorption and anchoringof LiPSs onto the matrix strengthened, and thereby the prepared battery indicates excellent electrochemical performances, after 500 cycles at a rate of 0.2 C, the discharge specific capacity remains 850 mAh g-1, showing excellent electrochemical reaction kinetics and its catalytic effect to the electrochemical reactions. Therefore, the shuttling inhibition of WO2.9-W2N/CNTs is mainly occurred by trapping-anchoring-catalytic conversion.

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姚德坤,羅琴,姜璐璇,胡歆,黎業(yè)生,吳子平.導電氮化物改性氧化鎢催化劑提升鋰硫電池電化學性能[J].稀有金屬材料與工程,2024,53(8):2285~2292.[Yao DeKun, Luo Qin, Jiang Lu Xuan, Hu Xin, Li YeSheng, Wu ZiPing. Conductive nitride-modified tungsten oxide catalyst improves electrochemical performance of lithium-sulfur batteries[J]. Rare Metal Materials and Engineering,2024,53(8):2285~2292.]
DOI:10.12442/j. issn.1002-185X.20230421

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  • 收稿日期:2023-07-04
  • 最后修改日期:2023-11-27
  • 錄用日期:2023-12-18
  • 在線發(fā)布日期: 2024-08-20
  • 出版日期: 2024-08-08