木质素纳米炭的制备及作为锂离子电池负极的性能研究

采用生物炼制工业中残渣提取的酶解木质素与乙酸锌在碱性条件下水热复合, 制备出低分子量木质素/氧化锌复合物(LWL/ZnO), 再通过碳化和酸洗后得木质素纳米炭材料(NLC). 通过对其形貌结构进行表征后发现, NLC呈粒径小于50 nm的纳米颗粒结构, 比表面积为833.25 m²/g, 介孔率高达58.07%, 其中孔径约10 nm的介孔发达. 电化学性能测试结果表明, NLC作为锂离子电池负极材料具有良好的循环性能和倍率性能, 在200 mA/g的电流密度下循环200次后仍能保持705 mA·h/g的可逆比容量.

Preparation of Lignin Nanocarbon and Its Performance as a Negative Electrode for Lithium-ion Batteries

Enzymatically hydrolyzed lignin extracted from residues in the biorefinery industry was hydrothermally combined with zinc acetate under alkaline conditions to prepare a low molecular weight lignin/zinc oxide compound（LWL/ZnO）， which was then carbonized and etched to obtain Lignin nano-carbon material（NLC）. After characterizing its morphology and structure， it is found that NLC has a nano-particle structure with a particle size of less than 50 nm， with a specific surface area of 833.25 m²/g， and a mesoporosity as high as 58.07%. The mesopores with a pore diameter of 10 nm are the most abundant. The electrochemical performance test results show that NLC as a lithium-ion battery anode material has good cycle performance and rate performance， and its reversible specific capacity can maintain 705 mA·h/g after 200 cycles at a current density of 200 mA/g.