文献类型：期刊文献

中文题名：瞬时高温法构建椰壳基钠离子电池负极硬碳材料

英文题名：Constructing Coconut Shell-based Hard Carbon Materials for Sodium-ion Battery Anodes by Instantaneous High-temperature Method

作者：李俊潇[1,2] 王傲[1,2] 汪书乐[1,2] 张高月[1,3] 孙康[1,2,4]

第一作者：李俊潇

机构：[1]中国林业科学研究院林产化学工业研究所,江苏省生物质能源与材料重点实验室,国家林业和草原局林产化学工程重点实验室,林木生物质低碳高效利用国家工程研究中心,江苏南京210042;[2]南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京210037;[3]东南大学能源与环境学院,江苏南京210096;[4]中国科学院新疆理化技术研究所,新疆乌鲁木齐830011

年份：2025

卷号：45

期号：1

起止页码：47-54

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划资助项目(2022YFB4201904)。

语种：中文

中文关键词：生物质;焦耳加热;硬碳;表征;钠离子电池

外文关键词：biomass;Joule heating;hard carbon;characterization;sodium-ion battery

分类号：TQ35;TQ127.11

摘要：以椰壳为原料,通过预炭化和快速高温精炼的两步热解法制备了生物质椰壳硬碳(CHC),采用高分辨率透射电镜(HRTEM)、X射线衍射(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、元素分析和N2吸附-脱附等温线等方法对CHC的形貌及结构进行了分析与表征。通过改变精炼温度调控硬碳的形貌结构,当精炼温度为1000、1200、1400、1600℃时,制得的椰壳硬碳分别标记为CHC-1000、CHC-1200、CHC-1400和CHC-1600。将所制得的硬碳材料用作钠离子电池负极并测试其电化学性能。利用焦耳加热装置制备硬碳,解决了以往硬碳制备过程中升/降温速率慢、能量利用率低的问题,为硬碳制备提供了新思路。结果显示:随着温度的升高,材料的石墨化程度增加,结构更加有序,其总比表面积逐渐减小,孔径分布集中在0~1 nm之间。1600℃下的样品获得了最优的电化学性能,在50 mA/g的电流密度下具有270.2(mA·h)/g的可逆循环容量和63.9%的首次库伦效率,支持“插层-填孔”机理,即斜坡容量归因于钠离子在硬碳碳层之间的插层行为,平台容量归因于钠离子在闭孔间的填充行为。
Using coconut shell as raw material,the biomass coconut shell hard carbon(CHC)was fabricated by two-step pyrolysis process of pre-carbonization and rapid high-temperature refining.The morphology and structure of CHC were analyzed and characterized using high-resolution transmission electron microscopy(HRTEM),X-ray diffraction(XRD),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),elemental analysis,and N 2 adsorption-desorption isotherms.The morphology and structure of hard carbon were controlled by adjusting the refining temperature.According to refining temperatures of 1000,1200,1400,and 1600℃,the resulting coconut shell hard carbons were labeled as CHC-1000,CHC-1200,CHC-1400,and CHC-1600,respectively.The prepared hard carbon material was used as anodes for sodium-ion battery and their electrochemical performance was tested.Using a Joule heating device to prepare hard carbon,solving the issues of slow heating/cooling rate and low energy efficiency in previous hard carbon preparation process,a new approach for hard carbon fabrication was provided.The results showed that as the temperature increased,the degree of graphitization of the samples also increased,total specific surface area gradually decreased,and the pore size distribution was concentrated at 0-1 nm.The optimal electrochemical properties were obtained at 1600℃,with a reversible cycling capacity of 270.2(mA·h)/g and a first coulomb efficiency of 63.9%at a current density of 50 mA/g.And the mechanism of‘intercalation-hole filling’was used to support the formation of carbon structure:the capacity in the sloping region was attributed to the intercalation behavior of sodium ions between hard carbon layers,and the capacity in the plateau region was attributed to the filling behavior of sodium ions among the closed pores.