摘要
实验通过小规模共沉淀和固相反应成功合成了无钴富锂锰基前驱体Ni_(0.3)Mn_(0.7)(OH)_(2),将前驱体不进行和进行机械粉碎,分别得到2种不同粒径的Ni_(0.3)Mn_(0.7)(OH)_(2)(D_(50)=1.626μm和0.710μm)前驱体。不同粒径大小的前驱体与LiOH以1∶1.55的摩尔比混合,经过高温烧结,合成2种颗粒大小的富锂锰基正极材料Li_(1.2)Ni_(0.24)Mn_(0.56)O_(2)(D_(50)=1.667μm和1.148μm)。实验结果表明,颗粒尺寸影响其物理化学性质和电化学性能。Li_(1.2)Ni_(0.24)Mn_(0.56)O_(2)(D_(50)=1.148μm)正极材料具有较小颗粒尺寸,显示出优异的电化学性能(在0.5 C下循环100次后,容量为190.7 mAh/g,循环保持率高达91.2%)。研究揭示了一种简易方法改变颗粒大小,并证明了粒径对电化学的重要性。
In this experiment,the cobalt-free lithium-rich manganese precursor Ni_(0.3)Mn_(0.7)(OH)_(2)was successfully synthesized by small-scale co-precipitation and solid-phase reaction,and the precursor was mechanically crushed with or without the precursor to obtain two different particle sizes of Ni_(0.3)Mn_(0.7)(OH)_(2)(D_(50)=1.626μm and 0.710μm)precursors.The precursors with different particle sizes were mixed with LiOH in a molar ratio of 1:1.55 and sintered at high temperature to synthesize two Li Mn-rich cathode materials with different particle sizes,Li_(1.2)Ni_(0.24)Mn_(0.56)O_(2)(D_(50)=1.667μm and 1.148μm).The experimental results show that the particle size also affects its physicochemical properties and electrochemical performance.Li_(1.2)Ni_(0.24)Mn_(0.56)O_(2)(D_(50)=1.148μm)cathode material with smaller particle size shows excellent electrochemical performance(capacity of 190.7 mAh/g after 100 cycles at 0.5 C and cycle retention rate of 91.2%).Our study reveals an easy way to change the particle size and demonstrates the importance of particle size for electrochemistry.
作者
文萌
夏鼎峰
钟盛文
WEN Meng;XIA Dingfeng;ZHONG Shengwen(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Key Laboratory of Power Battery and Materials,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属科学与工程》
CAS
北大核心
2024年第1期25-33,共9页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(51874151)。
关键词
富锂锰材料
颗粒大小
电化学
共沉淀法
锂电池
lithium-rich manganese materials
particle size
electrochemistry
co-precipitation
Li-ion batteries
