湖南长沙退役石墨包覆层修复再生技术数据集（2022年）

为表明包覆剂-沥青的选择、沥青的加入量对修复石墨物化性能和电化学性能的影响。研究发现，沥青掺杂包覆量为1%，修复温度为1200℃下保温1h。探究发现，温度可以有效提升废旧石墨的可逆容量，沥青热解碳包覆则在提供容量的同时改善了废旧石墨的循环稳定性。包覆改性后的石墨颗粒结构得到有效改善，颗粒平均粒径变大，形貌变得光滑，比表面积降低。电化学性能有效改善，可逆容量大幅提升，达到378mAh/g，不可逆容量仅17.9mAh/g，首次库伦效率增加到 96%，倍率性能和循环稳定性都有较好表现，各电流密度下容量衰减较小，0.1C电流密度下循环250次后容量保持率为98%。This study investigates the effects of the selection of pitch as the coating agent and the dosage of pitch on the physicochemical and electrochemical properties of repaired graphite. The results demonstrate that optimal performance is achieved when the pitch coating dosage is 1%, with a repair temperature of 1200°C and a holding duration of 1 hour. Further analysis reveals that temperature can effectively increase the reversible capacity of waste graphite, while pitch-derived pyrolytic carbon coating improves the cycling stability of waste graphite while sustaining its capacity. The structure of the coating-modified graphite particles is effectively improved: the average particle size increases, the surface morphology becomes smoother, and the specific surface area decreases. The electrochemical performance is significantly enhanced: the reversible capacity is substantially raised to 378 mAh/g, the irreversible capacity is merely 17.9 mAh/g, and the initial Coulombic efficiency increases to 96%. Both rate performance and cycling stability exhibit favorable performance, with minimal capacity decay at all tested current densities. After 250 cycles at 0.1C, the capacity retention rate reaches 98%.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于湖南长沙退役石墨包覆层的修复再生技术，研究沥青包覆剂对石墨物化及电化学性能的影响。实验表明，在特定条件下修复可显著提升可逆容量和循环稳定性，优化了石墨颗粒结构。数据来源于中南大学，支持锂电材料回收领域的技术开发与示范。