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[求助]
我测的LiNi0.5Mn1.5O4电池性能可信吗，有图？已有7人参与
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我装的CR2025纽扣电池，正极材料是LiNi0.5Mn1.5O4，负极是金属Li片，在1C条件下充放电，放电比容量到142mAh/g 了，从充放电时间来看都差不多为60min，符合1C条件下的充放电时间，且效率较高。但我之前用同样的材料装的电池容量没这么高，不知这样的数据可靠不，有问题吗？ 我认为可能原因： 1.是不是我的活性物质称量偏低，造成容量很高 2.这次我换了电解液，较高的容量会不会是电解液分解造成的。  LiNiMnO.PNG |
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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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2014-06-25 10:17:17, 6.66 M
14楼2014-06-25 10:24:06
LichKnight
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