河南某石墨精矿制备负极材料试验研究  

Experimental Research on Preparation of Anode Material from a Graphite Concentrate in Henan

作　　者：李荣改[1] 尤文卉 邱杨率[3] 徐靖[1] 孙景敏[1] 张凌燕[3] Li Ronggai;You Wenhui;Qiu Yangshuai;Xu Jing;Sun Jingmin;Zhang Lingyan(Henan Province Rock and Mineral Testing Center,Zhengzhou,He’nan 450012;Henan Center for Patent Examination Cooperation of the Patent Office of the State Intellectual Property Office,Zhengzhou,He’nan 450012;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan,Hubei 430070)

机构地区：[1]河南省岩石矿物测试中心,河南郑州450012 [2]国家知识产权局专利局专利审查协作河南中心,河南郑州450012 [3]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《非金属矿》2021年第5期75-78,82,共5页Non-Metallic Mines

基　　金：河南省自然资源厅2019年度省自然资源科研项目资助(豫自然资函[2019]373号-6)。

摘　　要：为克服天然石墨比表面积大、各向异性及层间距小的缺点,需要对天然鳞片石墨进行球形化、表面改性及掺杂等处理。对河南南阳地区某细鳞片石墨浮选精矿进行球形化试验研究,采用QCJ系列微粉气流机进行6次粉碎和10次整形后,可获得D50为16.37μm和9.41μm两种规格的石墨球形化产品,综合成球率为47.01%,振实密度分别为0.96 g/cm^(3)和0.89 g/cm3,该产品已达到GB/T 24533-2019中Ⅰ级改性天然石墨类锂离子电池负极材料对粒度及振实密度等的要求。将该球形石墨产品化学提纯至固定碳质量分数达到99.97%,进行电化学性能测试,首次库仑效率和放电容量分别为92.07%和365.45 mA·h/g。本研究为同类石墨资源制备负极材料提供了技术依据。In order to overcome the shortcomings of large specific surface area,anisotropy and small layer spacing of natural graphite,it is necessary to spherification,surface modification and doping of natural flake graphite.In this paper,spherical experimental study on a flaky graphite flotation concentrate from Nanyang area was conducted using QCJ series micro-powder airflow machine.After 6 times of grinding and 10 times of shaping with micro-powder airflow machine,two sizes of the spherical products were obtained with D50 of 16.37μm and 9.41μm,respectively.The combined yield of spherical product was 47.01%.The tap density of the two spherical products were 0.96 g/cm^(3) and 0.89 g/cm3,respectively.This product has reached theⅠlevel in GB/T 24533-2019 modified natural graphite and lithium ion battery cathode material requirements for particle size and tap density.The spherical graphite product was chemically purified to a fixed carbon content of 99.97%and then the electrochemical performance was tested.The first Coulomb efficiency and discharge capacity were 92.07%and 365.45 mA·h/g,respectively.The experimental results provide a technical basis for the preparation of anode materials from similar graphite resources.

关 键 词：石墨精矿 球形化 负极材料 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]