Li1.2[Mn0.52-0.5xNi0.20-0.5xCo0.08+x]O2正极材料的结构和储能特性

doi:10.3969/j.issn.2095-4239.2015.04.010

储能科学与技术 ›› 2015, Vol. 4 ›› Issue (4): 407-411.doi: 10.3969/j.issn.2095-4239.2015.04.010

Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂正极材料的结构和储能特性

王春雷¹, 任崇¹, 孔继周¹, 周飞¹, 李军秀², 俞超³, 汤卫平³

1 南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京 210016;
2 江苏凯力克钴业股份有限公司,江苏泰兴 225404;
3 上海空间电源研究所,上海 200245

收稿日期:2014-10-20 出版日期:2015-08-19 发布日期:2015-08-19
通讯作者: 周飞,教授,博士生导师,主要从事新能源材料及功能表面的研究,E-mail：fzhou@nuaa.edu.cn。
作者简介:王春雷（1990—）,男,硕士研究生,主要研究新能源材料,E-mail：wangchunlei-china@163.com
基金资助:
航天SAST基金（2013-YF-2059）,江苏省科技成果转化项目（BA2013142）,江苏省自然科学基金（BK 20130800）,中央高校基本科研业务费（NS 2014054）及江苏高校优势学科建设工程项目

Microstructure and energy storage properties of Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂cathode materials

WANG Chunlei¹, REN Chong¹, KONG Jizhou¹, ZHOU Fei¹, LI Junxiu², YU Chao³, TANG Weiping³

1 State Key Laboratory of Mechanics and Control of Mechanical Structure, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China;
2 Jiangsu Cobalt Nickel Metal Co. Ltd., Taixing 225404, Jiangsu, China;
3 Shanghai Institute of Space Power-Sources, Shanghai 200245, China

Received:2014-10-20 Online:2015-08-19 Published:2015-08-19

摘要/Abstract

摘要： 以碳酸钠为沉淀剂,乳酸钠为络合剂合成碳酸盐前驱体,950℃烧结制备了Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂（x=0, 0.02, 0.04, 0.06）系列材料,探讨元素含量变化对材料的结构、形貌、充放电性能的影响。研究结果表明：随着x的增大,材料的晶格常数c/a比值增加,层状结构更加完整。当x=0.02时,该材料的充放电性能最优,其首次放电容量为261.0 mA·h/g,0.5C下循环100次后的放电容量仍有189.9 mA·h/g,容量保持率高达98.85%,2C倍率下放电容量最高达到157.6 mA·h/g。进一步增大x值时,由于Co含量的上升,使得更多的Co^3+/4+ 2g轨道与O^2- 2p轨道发生带隙重叠,从而使得材料的比容量和循环性能下降。

关键词: 富锂锰基正极材料, 绿色合成, 结构, 充放电性能

Abstract: The MCO₃ precursor was synthesized via co-precipitation using Na₂CO₃ and C₃H₅O₃Na as the precipitation and complexing agents, then the mixtures of MCO₃ precursor and LiOH·H₂O were calcined at 950℃ to form the Li_1.2[Mn_0.52-0.5_xNi_0.2-0.5_xCo_0.08+_x]O₂(x=0, 0.02, 0.04, 0.06) series cathode materials. The influence of element content changes in Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂ on the microstructure and charge-discharge properties of Li_1.2[Mn_0.52-0.5_xNi_0.2-0.5_xCo_0.08+_x]O₂ cathode materials has been investigated. The results showed that the value of c/a for the lattice parameter is increased when the x value increases. When x is 0.02, the material showed the best properties with the initial discharge capacity of 261.0 mA·h/g, a capacity retention of 98.85% (189.9 mA·h/g ) after 100 cycles at 0.5 C and a discharge capacity of 157.6 mA·h/g at 2 C. With the further increase of x value (the rise of Co content), more 2g band of Co^3+/4+ overlapped with the 2p band of O^2- happens and it shows lower specific capacity and cycle ability.

Key words: Li-excess Mn-based cathode materials, green synthesis, microstructure, charge-discharge properties.

中图分类号:

TM911

王春雷, 任崇, 孔继周, 周飞, 李军秀, 俞超, 汤卫平. Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂正极材料的结构和储能特性[J]. 储能科学与技术, 2015, 4(4): 407-411.

WANG Chunlei, REN Chong, KONG Jizhou, ZHOU Fei, LI Junxiu, YU Chao, TANG Weiping. Microstructure and energy storage properties of Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂cathode materials[J]. Energy Storage Science and Technology, 2015, 4(4): 407-411.

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Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂正极材料的结构和储能特性

Microstructure and energy storage properties of Li_1.2[Mn_0.52-0.5_xNi_0.20-0.5_xCo_0.08+_x]O₂cathode materials

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