Hard carbon negative electrode material for sodium ion battery and preparation method of hard carbon negative electrode material

The invention relates to the technical field of sodium-ion batteries, and discloses a hard carbon negative electrode material for a sodium-ion battery and a preparation method of the hard carbon negative electrode material. The preparation method comprises the following steps: treating a lignin raw material to obtain purified lignin; s2, purifying lignin in a solvent system, and emulsifying ammonium phosphate/ammonium hydrogen phosphate to obtain a precursor; and S3, curing and carbonizing the precursor and epoxy resin to obtain the hard carbon material. According to the lignin provided by the invention, epoxy resin can be cured without any curing agent, an interpenetrating polymerization network is formed, the formed carbon material is stable in structure, the number of near-layer ordered graphite layers is increased, the interlayer spacing is large, and sodium storage is facilitated. 本发明涉及钠离子电池技术领域，公开了钠离子电池用硬碳负极材料及其制备方法；其制备方法，包括如下步骤：木质素原料经处理得到纯化木质素；S2溶剂体系中，纯化木质素、磷酸铵/磷酸氢铵经乳化得到前驱体；S3前驱体与环氧树脂经固化、碳化得到硬碳材料。本申请提供