磷掺杂硅碳负极材料的制备及性能研究  

Preparation and Properties of Phosphorus Doped Si@C Anode Material

作　　者：周玉 侯晓川 王志杰 刘云建[2] ZHOU Yu;HOU Xiaochuan;WANG Zhijie;LIU Yunjian(Zhejiang New Era Zhongneng Technology Co Ltd,Shaoxing 312369,Zhejiang,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]浙江新时代中能科技股份有限公司,浙江绍兴312369 [2]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《矿冶工程》2024年第2期131-134,140,共5页Mining and Metallurgical Engineering

基　　金：浙江省重点研发计划(2022C03061);国家自然科学基金(52004103)。

摘　　要：以微米硅粉为基体,通过固相热扩散法与高温热解法制备了磷掺杂的硅碳复合材料(Si-P@C),并用于锂离子电池负极材料。结果表明:Si-P@C负极材料在电流密度0.2 A/g下的首次放电比容量达2 164 mAh/g;与纯硅相比,循环性能得到较大改善,在电流密度0.5 A/g下循环50次后可逆比容量仍有1 176 mAh/g,容量保持率73.5%。磷掺杂和碳包覆可有效地提高硅负极的电子转移能力和反应动力学。With micron silicon powder as matrix,phosphorus⁃doped silicon⁃carbon composite material(Si⁃P@C)was synthesized by solid⁃state thermal diffusion and high⁃temperature pyrolysis,and then used as anode material of lithium⁃ion batteries.The results show that Si⁃P@C anode material demonstrates an initial discharge specific capacity up to 2164 mAh/g at a current density of 0.2 A/g.Compared with pure silicon,Si⁃P@C anode material presents greatly improved cycling performance.After 50 cycles at a current density of 0.5 A/g,it demonstrates a high reversible specific capacity of 1176 mAh/g,with the capacity retention ratio of 73.5%.It is concluded that phosphorus⁃doping and carbon coating can effectively improve the electron transfer ability and reaction kinetics of silicon anode.

关 键 词：锂离子电池 负极材料 硅碳负极 磷掺杂 碳包覆 

分 类 号：TM911[电气工程—电力电子与电力传动]