木屑衍生炭层间限制MnO纳米片用作锂离子负极材料

doi:10.3969/j.issn.0253-2417.2021.06.010

摘要/Abstract

摘要：

以杨木木屑为原料，运用浓硫酸和高锰酸钾的强氧化性，再经过800 ℃的高温制备了杨木屑基炭层间负载氧化锰（YC/MnO）复合材料用作锂离子电池负极材料。通过透射电镜、氮气吸附/脱附、X射线衍射、拉曼光谱及X射线光电子能谱表征了YC/MnO的微观结构和表面元素，采用循环伏安、恒电流充放电和电化学阻抗谱方法分析了复合材料的电化学性能。实验结果表明：氧化锰纳米片均匀的插入到杨木屑衍生炭层间，这种紧密的夹层结构有效降低了比表面积（70.3 m²/g）和电荷转移电阻（87.8 Ω），提高了平均孔径（3.38 nm）和离子扩散系数（2.26×10^-8 cm²/s），并使这种特殊的复合结构在2 A/g的电流密度下仍具有396.6 mAh/g的放电比容量，当电流密度恢复到0.1 A/g时放电比容量可恢复到696.4 mAh/g，具有良好的可逆性。在0.5 A/g的电流密度下循环200圈仍能保持116.9%的放电比容量；1 A/g的电流密度下循环400圈可保持124.7%，表现出了优异的循环稳定性。

关键词: 杨木, 氧化锰, 锂离子电池, 负极

Abstract:

Poplar wood chips were used as raw materials, and the composites of poplar wood chip-based charcoal interlayer loaded with manganese oxide(YC/MnO) were prepared for lithium-ion battery anode by using the strongly oxidizing properties of concentrated sulfuric acid and potassium permanganate, followed by the high temperature annealing at 800 ℃. The microstructure and surface elements of YC/MnO were characterized by transmission electron microscopy, nitrogen adsorption and desorption, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. The electrochemical properties of the composites were analyzed by cyclic voltammetry, constant current charge-discharge and electrochemical impedance spectroscopy. The experimental results showed that the manganese oxide nanosheets were uniformly inserted between poplar wood chip-derived carbon layers, and this tightly intercalated structure effectively reduced the specific surface area(70.3 m²/g) and charge transfer resistance(87.8 Ω), increased the average pore size(3.38 nm) and ion diffusion coefficient(2.26×10^-8 cm²/s), and made this special composite structure still have a discharge specific capacity of 396.6 mAh/g at a current density of 2 A/g.When the current density was restored to 0.1 A/g, the discharge specific capacity could be restored to 696.4 mAh/g with good reversibility. The discharge specific capacity retention rates of 116.9% and 124.7% could still be maintained after 200 and 400 cycles at the current densities of 0.5 and 1.0 A/g, respectively, showing excellent cycling stability.

Key words: poplar wood, manganese oxide, lithium ion batteries, anode

中图分类号:

TQ35

田伟豪, 胡智兴, 郭馨浩, 盛利志, 时君友. 木屑衍生炭层间限制MnO纳米片用作锂离子负极材料[J]. 林产化学与工业, 2021, 41(6): 76-82.

Weihao TIAN, Zhixing HU, Xinhao GUO, Lizhi SHENG, Junyou SHI. Interlayer-confinement of MnO Nanosheets in Sawdust-derived Carbon for Lithium Ion Anode Materials[J]. Chemistry and Industry of Forest Products, 2021, 41(6): 76-82.

图/表 9

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