【摘要】 天然鳞片石墨是制备锂离子电池负极材料的优质原料，本试验以鸡西、内蒙古、萝北3个地区固定碳含量（质量分数）约为95%的石墨精矿为原料，依次进行球形化整形和化学提纯，制备高纯球形石墨，并对高纯球形石墨进行了电化学性能测试。结果表明，经过球形化后，3个地区球形石墨振实密度分别为0.96 g/cm~3、0.94 g/cm~3、0.98 g/cm~3，其中萝北石墨振实密度最高，成球率为41.44%。较优混酸提纯工艺为：混酸与石墨的液固比为3 mL/g,HF体积分数为30%，反应时间为6 h，反应温度为70℃，经混酸提纯处理后，3个地区球形石墨固定碳含量分别提高至99.90%、99.88%、99.97%。电化学性能测试结果表明，3个地区石墨负极材料的首次充放电效率均大于90%，首次放电容量均高于360 mAh/g，是制备天然石墨负极材料的理想原料。更多还原

【Abstract】 Natural flake graphite is a high quality raw material for the preparation of lithium ion battery anode materials. In this paper, the graphite concentrate with a fixed carbon content of about 95% in Jixi, Inner Mongolia and Luobei was used as raw material. The spherical shape and chemical purification were carried out in order to prepare high purity spherical graphite. The results showed that after spherification, the vibrational densities of spherical graphite in three regions were 0.96 g/cm~3, 0.94 g/cm~3 and 0.98 g/cm~3, respectively, among which Luobei graphite had the highest vibrational density and the pellet formation rate is 41.44%. The optimal purification process of mixed acid was determined: the liquid-solid ratio of mixed acid and graphite was 3 mL/g, the volume fraction of HF was 30%, the reaction time was 6 h, the reaction temperature was 70 ℃, and the fixed carbon content of spherical graphite in three regions were increased to 99.90%, 99.88% and 99.97%, respectively. The electrochemical performance test results showed that the first charge and discharge efficiency of the graphite anode materials in the three regions was above 90%, and the first discharge capacity was higher than 360 mAh/g, which was an ideal raw material for the preparation of natural graphite anode materials.更多还原