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3.22文献解读:三元材料在高能量密度锂离子电池中的应用
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今天的文献解读时间定在11:30开始,欢迎大家一起参加,踊跃发言讨论。用到的文献简介如下: 题目:An application of lithium cobalt nickel manganese oxide to high-power and high-energy density lithium-ion batteries 文献出处:Journal of Power Sources 174 (2007) 813–817 作者:Hiroshi Yoshizawa, Tsutomu Ohzuku 摘要部分:Evolved gas analysis (EGA) by mass spectroscopy (MS) was carried out for the pyrolysis of Li1−xCo1/3Ni1/3Mn1/3O2(185 mAh g−1 of charge capacity) and the results were compared with that of Li1−x CoO2(140 mAh g−1). Electrochemically prepared Li1−xCo1/3Ni1/3Mn1/3O2clearly shows that O2 evolution begins at much higher temperature than Li1−x CoO2, suggesting that Li1−xCo1/3Ni1/3Mn1/3O2 is superior to LiCoO2 with respect to thermal stability. High-temperature XRD measurements of charged LiCo1/3Ni1/3Mn1/3O2-electrodes at 4.45 V were also carried out and shown that the decomposition product by heating was identified as a cubic spinel consisting of cobalt, nickel, and manganese. This indicates that phase change from a layered to spinel-framework structure plays a crucial role in the suppression of oxygen evolution from the solid matrix. In order to show practicability of the new material, lithium-ion batteries with graphite-negative electrodes are fabricated and examined in the R18650-hardware. The new lithium-ion batteries show high rate discharge performances, excellent cycle life, and safety together with high-energy density. 感兴趣的虫友们可以先下载文献看看。[ Last edited by seagrove on 2012-3-22 at 10:23 ] |
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2012-03-22 10:00:20, 577 K
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92楼2012-08-15 22:33:50
2楼2012-03-22 11:31:00
seagrove: 取消置顶 2012-03-22 12:25:15
hejin04c: 回帖置顶 2012-03-22 15:30:12
hejin04c: 回帖置顶 2012-03-22 15:30:12
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2.首先我们看看这篇文章的题目:镍/钴/锰酸锂在高功率、高能量密度锂离子电池中的应用。 一目了然的让我们了解到这篇文献主要是讲镍/钴/锰酸锂材料,而它针对的是高功率、高能量密度的电池。 其次是作者,Hiroshi Yoshizawa, Tsutomu Ohzuku一看就知道是日本人,对于做锂电来说,日本人在世界还是比较有地位的,由此判断这篇文献值得我们参考。 再来看看通讯作者Tsutomu Ohzuku的资料:http://read.jst.go.jp/public/cs_ ... ame_code=1000056287 他的研究主题主要包括: ①Studies on Solid State Electrochemistry topotactic reaction,solid-State Redox Reaction 即电化学的固态局部规整反应、固态氧化还原反应 ②Materials Research for Advanced Lithium Batteries Insertion materials,lithium batteries 即先进锂电池材料研究 ③Research on the Structural Chemistry of Lithiated Manganese Dioxide manganese dioxide 即锂二氧化锰的结构研究 他从1989年就开始做Li-MnO2非水电池的电化学研究,直到我们今天分析的这一篇关于三元材料的文献。 |
3楼2012-03-22 11:31:31
seagrove: 取消置顶 2012-03-22 12:25:13
hejin04c: 回帖置顶 2012-03-22 15:30:17
hejin04c: 回帖置顶 2012-03-22 15:30:17
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3.接下来是摘要部分,对文章所做的研究进行了概述。 ①采用MS对Li1−xCo1/3Ni1/3Mn1/3O2(185 mAh g−1 of charge capacity)材料进行EGA分析,并与 Li1−x CoO2(140 mAh g−1)进行对比; ②通过电化学测量我们可以清楚的看到,O2生成的温度远高于Li1−x CoO2,说明Li1−xCo1/3Ni1/3Mn1/3O2的热稳定性比现在的LiCoO2要好; ③高温XRD测试结果表明,三元材料加热分解的产物是尖晶石型的钴、镍、锰; ④也就是说,材料由层状到尖晶石相的变化对O2的生成起到了决定性的作用; ⑤与石墨负极结合制成锂离子电池,并用R18650-hardware检测; ⑥制得的锂离子电池优点:高倍率放电性能、卓越的循环寿命、高能量密度下的安全性强。 由此,我们已经大概了解了这篇文献所做的研究。 |
4楼2012-03-22 11:36:04
简单回复
枫行天下10楼
2012-03-22 14:51
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三星好评 顶一下,感谢分享!
枫行天下11楼
2012-03-22 15:04
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顶一下,感谢分享!
CCTchenxi14楼
2012-03-22 15:52
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五星好评 顶一下,感谢分享!













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