简介概要

锂离子电池正极材料LiNi0.45Co0.10Mn0.45O2的合成及电化学性能

来源期刊:中南大学学报(自然科学版)2008年第1期

论文作者:张宝 张明 李新海 王志兴 郭华军 彭文杰

文章页码:75 - 75

关键词:锂离子电池;正极材料;LiNi0.45Co0.10Mn0.45O2

Key words:lithium-ion batteries; cathode material; LiNi0.45Co0.10Mn0.45O2

摘    要:以Li2CO3和Ni-Co-Mn三元系氧化物为原料,在空气中通过固相反应制备LiNi0.45Co0.10Mn0.45O2。研究反应条件对产物结构的影响,采用扫描电镜(SEM)表征样品的形貌,用粒度分析、振实密度和比表面测定等手段比较不同合成条件对产物性能的影响。研究结果表明:当n(Li)/n(M)不同时合成的产物性能差别很大,较适宜的n(Li)/n(M)为1.4/1;球磨可以提高产物的振实密度和比表面,并且对改善材料电化学性能有显著影响,在2.75~4.25 V电压范围内LiNi0.45Co0.10Mn0.45O2首次放电比容量达到125.9 mA·h/g,50次循环后放电比容量为128.7 mA·h/g。

Abstract: LiNi0.45Co0.10Mn0.45O2 was prepared by solid-state reaction method in air using Li2CO3 and Ni-Co-Mn as starting materials. The effect of reaction conditions on the structure of the product was studied. The morphology of LiNi0.45Co0.10Mn0.45O2 was characterized by scanning electron microscopy. The effect of preparation conditions on the performance of the product was characterized by particle analyzer, tap-density and specific surface area. The results show that the mole ratio of Li to M has a critical role in the performance of the product and the suitable mole ratio of Li to M is about 1.4/1. Ball-milling is a useful method to improve the performances such as tap-density, specific surface area and has significant effects on the electrochemical performance. In the voltage ranges of 2.75-4.25 V, the initial discharge capacity of LiNi0.45Co0.10Mn0.45O2 is 125.9 mA·h/g, and the discharge capacity is 128.7 mA·h/g after 50 cycles.

基金信息:国家自然科学基金资助项目



详情信息展示

锂离子电池正极材料LiNi0.45Co0.10Mn0.45O2的合成及电化学性能

张  宝,张  明,李新海,王志兴,郭华军,彭文杰

(中南大学 冶金科学与工程学院,湖南 长沙,410083)

摘  要:以Li2CO3和Ni-Co-Mn三元系氧化物为原料,在空气中通过固相反应制备LiNi0.45Co0.10Mn0.45O2。研究反应条件对产物结构的影响,采用扫描电镜(SEM)表征样品的形貌,用粒度分析、振实密度和比表面测定等手段比较不同合成条件对产物性能的影响。研究结果表明:当n(Li)/n(M)不同时合成的产物性能差别很大,较适宜的n(Li)/n(M)为1.4/1;球磨可以提高产物的振实密度和比表面,并且对改善材料电化学性能有显著影响,在2.75~4.25 V电压范围内LiNi0.45Co0.10Mn0.45O2首次放电比容量达到125.9 mA·h/g,50次循环后放电比容量为128.7 mA·h/g。

关键词:锂离子电池;正极材料;LiNi0.45Co0.1Mn0.45O2

中图分类号:TM912.9         文献标识码:A         文章编号:1672-7207(2008)01-0075-05

 

Synthesis and electrochemical properties of LiNi0.45Co0.10Mn0.45O2 cathode material for lithium ion batteries

ZHANG Bao, ZHANG Ming, LI Xin-hai, WANG Zhi-xing, GUO Hua-jun, PENG Wen-jie

(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)

Abstract: LiNi0.45Co0.10Mn0.45O2 was prepared by solid-state reaction method in air using Li2CO3 and Ni-Co-Mn as starting materials. The effect of reaction conditions on the structure of the product was studied. The morphology of LiNi0.45Co0.10Mn0.45O2 was characterized by scanning electron microscopy. The effect of preparation conditions on the performance of the product was characterized by particle analyzer, tap-density and specific surface area. The results show that the mole ratio of Li to M has a critical role in the performance of the product and the suitable mole ratio of Li to M is about 1.4/1. Ball-milling is a useful method to improve the performances such as tap-density, specific surface area and has significant effects on the electrochemical performance. In the voltage ranges of 2.75-4.25 V, the initial discharge capacity of LiNi0.45Co0.10Mn0.45O2 is 125.9 mA·h/g, and the discharge capacity is 128.7 mA·h/g after 50 cycles.

Key words: lithium-ion batteries; cathode material; LiNi0.45Co0.10Mn0.45O2

                    

锂离子蓄电池具有工作电压高、比能量高、容量大、自放电小、循环性能好、使用寿命长、质量小、体积小等优点而成为移动电话、笔记本电脑等便携式电子设备的理想电源,并且在过去10年中得到迅猛发展;与此同时,为缓解环境压力,世界各国竞相开发以电池为动力的电动汽车(EV)[1-5]。其中电池正极材料的研究十分关键。

目前,用作锂离子电池正极材料90%以上是LiCoO2,但因钴的贮量有限,价格昂贵,并且LiCoO2还存在安全性和耐过充性问题,使得许多科学工作者都在致力于LiCoO2替代材料的研究[6-7]。Shaju等[8]发现通过共沉淀合成的LiNi0.5Mn0.5O2材料在2.5~4.3 V电压范围内比容量可以达到150 mA·h/g。Kang等[9]发现在LiNi0.5Mn0.5O2材料中掺入Al,Ti和Co都可以提高LiNi0.5Mn0.5O2材料放电容量以及电导率,在这些掺杂离子中Co的加入对性能改善最为明显。许多研究表 明[10-17],LiNi1/3Co1/3Mn1/3O2,LiNixCoyMn1-x-yO2和LiNixCo0.05Mn0.95-xO2都表现出良好的电化学性能,是最有可能替代LiCoO2的正极材料。在此,本文作者采用固相法合成了LiNi0.45Co0.10Mn0.45O2正极材料,研究不同合成条件对产物的物理性能与电化学性能的影响。

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