凝胶燃烧法合成Li1.07Mn1.93O4纳米片及其高倍率放电和循环稳定性

doi:10.3866/PKU.WHXB201112052

摘要/Abstract

摘要： 利用聚乙烯吡咯烷酮(PVP)作为聚合物配位剂和燃料, 通过凝胶-燃烧法合成了Li_1.07Mn_1.93O₄纳米片. 采用热重/差热分析(TG/DTA)研究了凝胶的燃烧过程. 采用X射线多晶衍射(XRD)分析了材料的结构, 结果表明合成的Li_1.07Mn_1.93O₄结晶完整, 无杂质相. 扫描电镜(SEM)结果显示材料的二次形貌为厚度约100 nm的片状,由大小约100 nm的一次颗粒构成. 充放电测试表明Li_1.07Mn_1.93O₄纳米片具备极佳的倍率放电性能和优秀的循环性能. 0.5C(1C=120 mA·g^-1)倍率的初始放电容量为115.4 mAh·g^-1, 即使倍率增大到40C, 放电容量仍有105.3 mAh·g^-1. 在10C 倍率的放电条件下, 循环850 次容量保持率为81%. 电化学阻抗谱(EIS)测试表明Li_1.07Mn_1.93O₄纳米片的界面电荷转移电阻(R_ct)远小于同类商业材料.

关键词: 锂离子电池, 锰酸锂, 燃烧合成, 倍率性能, 循环性能

Abstract: Li_1.07Mn_1.93O₄ nanoflakes were synthesized by a gel-combustion method using polyvinylpyrrolidone (PVP) as the polymer chelating agent and fuel. Thermogravimetric and differential thermal analyses (TG/DTA) were used to investigate the combustion process of the gel precursor. X-ray diffraction (XRD) analysis indicated that the as-prepared Li_1.07Mn_1.93O₄ was a pure, highly crystalline phase. Scanning electron microscopy (SEM) results showed that most of the secondary particles were nanoflakes, about 100 nm in thickness, and the primary particle of the nanoflakes was about 100 nm in size. Charge and discharge tests suggested that the Li_1.07Mn_1.93O₄ nanoflakes had excellent rate capability and good cycling stability. The initial discharge capacity was 115.4 mAh·g^-1 at a rate of 0.5C (1C=120 mAh·g^-1) and the capacity was maintained at 105.3 mAh·g^-1 at the high discharge rate of 40C. When cycling at 10C, the material retained 81% of its initial capacity after 850 cycles. Electrochemical impedance spectroscopy (EIS) tests indicated that the charge-transfer resistance (R_ct) of the Li_1.07Mn_1.93O₄ nanoflakes was much less than that of commercial Li_1.07Mn_1.93O₄.

Key words: Lithium ion battery, Lithium manganese oxide, Combustion synthesis, Rate capability, Cycling stability

毛景, 代克化, 翟玉春. 凝胶燃烧法合成Li_1.07Mn_1.93O₄纳米片及其高倍率放电和循环稳定性[J]. 物理化学学报, 2012, 28(02), 349-354. doi: 10.3866/PKU.WHXB201112052

MAO Jing, DAI Ke-Hua, ZHAI Yu-Chun. High Rate Capability and Cycling Stability of Li_1.07Mn_1.93O₄ Nanoflakes Synthesized via Gel-Combustion Method[J]. Acta Phys. -Chim. Sin. 2012, 28(02), 349-354. doi: 10.3866/PKU.WHXB201112052

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201112052

https://www.whxb.pku.edu.cn/CN/Y2012/V28/I02/349

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凝胶燃烧法合成Li_1.07Mn_1.93O₄纳米片及其高倍率放电和循环稳定性

High Rate Capability and Cycling Stability of Li_1.07Mn_1.93O₄ Nanoflakes Synthesized via Gel-Combustion Method

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