CAJ | 학술논문

以天然石墨为原料，球磨过筛得到颗粒均一的球形颗粒。酚醛树脂作为碳源对球磨后石墨进行包覆，经过高温炭化处理，在天然石墨表面形成一层炭包覆层，再对包覆后石墨用聚二甲基硅氧烷进行表面预成膜处理。采用X射线衍射仪、扫描电子显微镜和电池测试系统等对共改性石墨进行结构、形貌和电化学性能分析。XRD分析显示，共改性后的石墨层间距d（002）和无序化程度增加，说明在石墨的表面形成了一定的包覆层。SEM图片中可以看出改性后的石墨颗粒致密均匀且较为圆滑，这种结构使得石墨颗粒表面积适当减小，电化学性能得到提高。电化学性能测试结果表明，采用共改性后的石墨在0．1 C首次放电比容量达到362 mAh/g，首次库伦效率为92％，100个循环后容量仍保持为最高容量的98．6％。
이천연석묵위원료，구마과사득도과립균일적구형과립。분철수지작위탄원대구마후석묵진행포복，경과고온탄화처리，재천연석묵표면형성일층탄포복층，재대포복후석묵용취이갑기규양완진행표면예성막처리。채용X사선연사의、소묘전자현미경화전지측시계통등대공개성석묵진행결구、형모화전화학성능분석。XRD분석현시，공개성후적석묵층간거d（002）화무서화정도증가，설명재석묵적표면형성료일정적포복층。SEM도편중가이간출개성후적석묵과립치밀균균차교위원활，저충결구사득석묵과립표면적괄당감소，전화학성능득도제고。전화학성능측시결과표명，채용공개성후적석묵재0．1 C수차방전비용량체도362 mAh/g，수차고륜효솔위92％，100개순배후용량잉보지위최고용량적98．6％。
The natural graphite with uniform spherical graphite particles was gotten through ball milling sieve processing.Carbon-coated natural graphite composite was prepared by carbonization of phenolic resin-coated natural graphite at high temperature,and the coated graphite was pre filmed with polydimethyl siloxane on the surface.X-ray diffraction (XRD),scanning electron mi-croscopy (SEM)and battery test system were used to characterize the crystal structure,mor-phology and electrochemical properties of samples.XRD results showed that phenolic was suc-cessfully coated on the surface of natural graphite because d (002 )and the disorder degree in-creased.SEM images indicated that the graphite particles was uniform and smooth,and this kind of structure made graphite surface area reduced,the electrochemical performance was improved. Electrochemical performance revealed that the capacity of compound modification graphite was 362 mAh/g at 0.1 C,coulomb efficiency was 92% for the first time.After the 100 th cycle,the capacity remained 98.6% of the highest capacity.