无机固体电解质Li7La3Zr2O12的制备及掺杂改性研究进展

无机固体电解质由于其安全性能高、能量密度大等特点备受研究者的青睐。其中Garnet型锂离子无机固体电解质Li_7La_3Zr_2O_(12)具有较高的离子导电率,较低的界面电阻,优良的稳定性能和电化学性能,在未来的全固态锂离子电池、锂空气电池等领域有着广阔的应用前景。主要从Li_7La_3Zr_2O_(12)的晶体结构、制备工艺和掺杂改性等方面详细阐述无机固态电解质Li_7La_3Zr_2O_(12)的研究进展。     

Graphene as a high-capacity anode material for lithium ion batteries

Graphene was produced via a soft chemistry synthetic route for lithium ion battery applications. The sample was characterized by X-ray diffraction, nitrogen adsorption-desorption, field emission scanning electron microscopy and transmission electron microscopy, respectively. The electrochemical performances of graphene as anode material were measured by cyclic voltammetry and galvanostatic charge/discharge cycling. The experimental results showed that the graphene possessed a thin wrinkled paper-like morphology and large specific surface area (342 m²·g^?1). The first reversible specific capacity of the graphene was as high as 905 mA·h·g^?1 at a current density of 100 mA·g^?1. Even at a high current density of 1000 or 2000 mA·g^?1, the graphene maintained good cycling stability, indicating that it is a promising anode material for high-performance lithium ion batteries.     

球磨法制备SnO_2/石墨复合材料及其电化学性能

利用球磨法制备了氧化锡（SnO2）/石墨复合材料,采用场发射扫面电镜、X射线衍射和比表面积对样品进行表征,结果显示,SnO2颗粒包裹在石墨片层上,SnO2/石墨复合材料的比表面积为83.90 m2/g。电化学测试结果表明,球磨法制备的SnO2/石墨复合材料首次放、充电容量分别为1 749mA h/g和1 346 mA h/g,在50 mA/g,100 mA/g和500 mA/g电流密度下,循环40次后,该电极可逆放电容量仍然高达432 mA h/g。     

不同基因型大豆氮效率的研究

通过对不同基因型大豆新大豆1号和黑农40的试验研究,结果表明,施氮对新大豆1号的增产作用不明显,但对黑农40有较好的增产作用;花期黑农40和新大豆1号上、中、下层叶片氮含量都随着施氮量的增加而增加,黑农40叶片氮含量与施氮量的相关系数都达到极显著相关,但新大豆1号没有达到显著水平;施氮对新大豆1号的生物固氮抑制程度高于黑农40,使新大豆1号生物固氮降低36. 3% ~85. 2%。     

向日葵盘果胶的提取工艺条件研究

采用微波辅助法从向日葵盘中提取果胶,并用响应面分析法优化了提取参数(提取液pH、提取温度、固液比和微波功率)对果胶提取率的影响.从功效、能量节约和实验可行性角度考虑,获得向日葵盘提取果胶的最佳条件是:pH值3.4,提取时间6.8 min,提取液料比为1:20,微波功率464 W.提取液经浓缩后采用95%乙醇沉淀,所得果胶酯化度为35.42%,半乳糖醛酸含量为87.3%,而灰分仅为4.75%.     

树脂对向日葵盘果胶液脱色的研究

比较了6种树脂对向日葵盘果胶液的脱色效果.在静态吸附试验研究的基础上,筛选出效果较好的树脂进行动态试验研究.实验表明:D900型吸附树脂对向日葵盘果胶提取液具有较好的吸附脱色效果和较低的果胶损失率,该树脂对向日葵盘果胶脱色的适宜工艺参数为:室温 (约25℃),流速3.6BV/h,上柱液pH为4左右.此工艺对果胶提取液中色素的吸附率可达84.3%.树脂吸附后可用70%乙醇进行洗涤再生.