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北京石油化工学院2026年研究生招生接收调剂公告
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ncuzyh

新虫 (正式写手)

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10楼: Originally posted by lr-dream at 2014-06-24 17:18:52
可能是极片的质量有误差,偏小;换的新电解液耐高压,可能性能就会好一点,电解液分解只会造成容量下降而已。可以重复实验,一次多做几组电池,有时候一个电池数据说明不了什么问题,实验中存在的各种误差都有可能导 ...

恩,谢谢!可能是质量的问题,我重新称了铝箔的质量,质量都不均匀,相差达0.3mg。
11楼2014-06-24 18:10:49
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ncuzyh

新虫 (正式写手)

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9楼: Originally posted by jjwzq890803 at 2014-06-24 15:14:28
我也是,做的石墨负极,高倍率性能比低倍率性能好,循环次数是5次一个倍率,不知道这个现象怎么解释?重复实验怎么样呢?我一组做出来都是一样...

重复试验我的重图浆料开始做,我现在测得电池性能都不均一,有时相差很大。
12楼2014-06-24 18:13:27
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songfoo

金虫 (著名写手)

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★ ★ ★ ★ ★
ncuzyh: 金币+5 2014-06-25 08:54:27
这个充放电曲线很正常,能达到142的容量说明材料做得很不错,一般130以上就算可以了。高倍率比低倍率的容量还高也是正常的,但从理论上还不好解释。
如果怀疑就重测,考察重现性。
另外能说说采用了什么手段使材料性能达到如此优秀呢?掺杂了什么元素,表面进行了什么修饰?用什么方法制备的,共沉淀?溶胶凝胶?还是其它。
13楼2014-06-25 08:18:53
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ncuzyh

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13楼: Originally posted by songfoo at 2014-06-25 08:18:53
这个充放电曲线很正常,能达到142的容量说明材料做得很不错,一般130以上就算可以了。高倍率比低倍率的容量还高也是正常的,但从理论上还不好解释。
如果怀疑就重测,考察重现性。
另外能说说采用了什么手段使材料 ...

这是南开大学陈军课题组13年发的文章,他是先合成MnC2O4,在热分解得到Mn2O3,最后通过Li,Ni的插入合成多孔一维的纳米结构的LiNiMnO.


Experimental details
Materials synthesis. The MnC2O4 wires were synthesized by a confined
precipitation reaction in microemulsion. In brief, a quaternary microemulsion was
first prepared by dissolving cetyltrimethyl ammonium bromide (CTAB, 4.0 g) in a
mixture of cyclohexane (150 mL), n-pentanol (5.0 mL), and oxalic acid aqueous
solution (7.5 mL, 0.8 M). After constant stirring for 30 min, Mn(CH3COO)2 aqueous
solution (2.5 mL, 0.2 M) was dripped and the resulting microemulsion was vigorously
stirred for 2 h at room termperature. The white MnC2O4 precursors were filtered,
washed with ethanol, and vaccum-dried.
The porous Mn2O3 wires were obtained by thermal decomposition of the MnC2O4
wires at 500 oC for 10 hours. To obtain LNMO nanorods, 12 mmol of Mn2O3 wires,
8.3 mmol Li CH3COO •2H2O, 4 mmol Ni(CH3COO)2•4H2O were dispersed in 10 mL
of ethanol. The ethanol was evaporated slowly at room temperature under stirring.
The remained solid was ground manually for 10 minutes and the calcined at 700 oC
for 6 hours in air.
The bulk LNMO was prepared by a simple coprecipitation method. In a typical
synthesis route, LiCH3COO•2H2O, Ni(CH3COO)2•4H2O, and Mn(CH3COO)2•4H2O
in molar ratio of 1.03:0.5:1.5 and in quantities corresponding to 0.9 g LNMO were
dissolved in 20 mL of water. The solution was heated to 50 oC and then 3 mL of
PEG400 was added. Under constant stirring, 2.0 g H2C2O4•2H2O was added to the
solution, and then heated to 90 oC to evaporate water. The obtained solid was calcined
at 900 oC under air atmosphere for 10 h, follow by reannealing at 700 oC for 20 h in
4
air to obtain the ordered bulk LNMO.

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14楼2014-06-25 10:24:06
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yellowkey

木虫 (著名写手)

把这个电池在小电流下,如0.1C充放电,看看得到的放电容量是否超过145,如果是,那一定质量没称准。。。
15楼2014-06-25 10:42:39
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