Al掺杂修饰LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)正极材料的合成及电化学性能  

Synthesis and electrochemical properties of Al-doped modified LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)cathode materials

作　　者：冯国威 汪洋 王冰[1] 唐立丹[1] 刘亮[1] 齐锦刚[1] FENG Guowei;WANG Yang;WANG Bing;TANG Lidan;LIU Liang;QI Jingang(School of Materials Science and Engineering,Liaoning University of Technology,Jinzhou 121000,Liaoning Province,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121000

出　　处：《化学工程》2025年第4期36-42,共7页Chemical Engineering(China)

基　　金：辽宁省教育科研资助项目(JJL201915409)。

摘　　要：以乙酸锂、乙酸镍、乙酸钴、乙酸锰和乙酸铝为原料,柠檬酸为络合剂,先利用溶胶凝胶法合成得到LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)材料,改变乙酸铝的用量得到不同Al掺杂量的LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)材料。通过XRD、SEM、EDS对样品进行表征,结果表明:不同Al掺杂量的LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)均具有α-NaFeO 2层状结构,引起晶格发生畸变。Al^(3+)掺杂可以拓宽锂离子扩散的通道,Al掺杂量为0.03时具有更稳定更有序的层状结构。电化学测试结果表明:NCM811-Al0.03在1C下的首次放电比容量达到146.02 mA·h/g,200次循环后的容量保持率为82.3%,电化学可逆性较好且电荷转移电阻更小。Using lithium acetate,nickel acetate,cobalt acetate,manganese acetate and aluminum acetate as raw materials and citric acid as complexing agent,LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)materials were firstly synthesized using the sol-gel method,and LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)materials with different amount of Al doping were obtained by varying the dosage of aluminum acetate.The sample were characterized by XRD,SEM and EDS.The results show that LiNi_(0.8)Co_(0.1)Mn_(0.1-x)Al_(x)O_(2)with different amount of Al doping all hasα-NaFeO 2 layered structure,which causes distortion of the crystal lattice.Al^(3+)doping can broaden the channel for lithium ion diffusion,and the layered structure is more stable and ordered,when Al doping amount is 0.03.The electrochemical test results show that the first discharge specific capacity of NCM811-Al0.03 at 1C reaches 146.02 mA·h/g,and the capacity retention rate after 200 cycles is 82.3%,with better electrochemical reversibility and lower charge transfer resistance.

关 键 词：锂离子电池 正极材料 高镍三元锂材料 铝掺杂 电化学性能 

分 类 号：O646[理学—物理化学]