CAJ | 학술논문

通过共沉淀法制备了M(OH)_2(M=Mn，Ni)前驱体,并与LiOH混合,合成了锂离子电池富锂正极材料Li[Ni,Li_(1/3-2x/3_Mn_(2/3-x/3)]O_2,采用XRD、SEM和充放电实验对其进行表征.研究结果表明,Li,Ni,Mn原子在M层中呈有序分布,形成超结构;富锂正极材料由亚微米的一次粒子团聚组成1～3μm颗粒;在2.0～4.8 V电位范围内,充放电电流密度为10 mA／g时,富锂正极材料表现出很高的可逆比容量,达到200～240mA·h/g,同时具有良好的循环可逆性能.
통과공침정법제비료M(OH)_2(M=Mn，Ni)전구체,병여LiOH혼합,합성료리리자전지부리정겁재료Li[Ni,Li_(1/3-2x/3_Mn_(2/3-x/3)]O_2,채용XRD、SEM화충방전실험대기진행표정.연구결과표명,Li,Ni,Mn원자재M층중정유서분포,형성초결구;부리정겁재료유아미미적일차입자단취조성1～3μm과립;재2.0～4.8 V전위범위내,충방전전류밀도위10 mA／g시,부리정겁재료표현출흔고적가역비용량,체도200～240mA·h/g,동시구유량호적순배가역성능.
The Li-rich cathode materials Li [Ni_x Li_(1/3-2x/3) Mn _(2/3-x/3)] O_2 (x = 1/5, 1/4, 1/3 ) were synthesized with co-precipitated metal hydroxide precursors M ( OH ) _2 ( M = Mn, Ni ). The results of X-ray diffraction (XRD) and selected area electron diffraction(SAED) analysis confirmed the Li, Ni and Mn atoms are ordered in the M layer to form the superstrucutre. Images of scanning electron microscopy(SEM) show the Li-rich materials particles are about 1-3 μm, aggregated of submicron grains. Electrochemical behavior was examined by charge-discharge cycling. The Li[Ni_x Li_(1/3-2x/3)Mn_(2/3-x/3)] O_2 (x = 1/5, 1/4, 1/3 ) materials exhibited high reversible capacity of 200-240 mA·h/g and excellent cycle performance between 2.0 and 4.8 V at 10 mA/g current density.