目前,锂离子电池的安全问题越来越受到各界关注。为此,采用C80微量量热仪对镍钴铝酸锂/钛酸锂电池的主要电池材料体系进行热稳定性测试,采用ARC进行镍钴铝酸锂/钛酸锂电池的热失控试验,两相结合分析镍钴铝酸锂/钛酸锂电池体系的热稳定...目前,锂离子电池的安全问题越来越受到各界关注。为此,采用C80微量量热仪对镍钴铝酸锂/钛酸锂电池的主要电池材料体系进行热稳定性测试,采用ARC进行镍钴铝酸锂/钛酸锂电池的热失控试验,两相结合分析镍钴铝酸锂/钛酸锂电池体系的热稳定性。研究发现,电池热失控的温度(171℃)与隔膜的熔断温度(168.62℃)相近,LTO/电解液体系的活化能(75.43 k J/mol)远低于NCA/电解液体系(246.97 k J/mol),但NCA/电解液体系的发热量(908.42 J/g)却远高于LTO/电解液体系(284.63 J/g)。由此表明,镍钴铝酸锂/钛酸锂电池的热失控过程为:隔膜熔断导致正负极短路,然后负极材料与电解液反应积累热量,进而导致正极材料与电解液反应大量放热。整个过程从引发至热失控达到最高温度用时仅45 s。展开更多
A tri(8 quinolinol)nickel coordination compound, [Ni 2(HQ) 3Q 3] ClO 4, was synthesized and its crystal structure was determined by X ray diffraction. The crystal structure indicated a space group of P2 1/c with a =1....A tri(8 quinolinol)nickel coordination compound, [Ni 2(HQ) 3Q 3] ClO 4, was synthesized and its crystal structure was determined by X ray diffraction. The crystal structure indicated a space group of P2 1/c with a =1.613 8(1) nm, b =1.590 0(1) nm, c =1.939 9(1) nm, β =94.663(2)°, V = 4.961 2(6) nm 3 and Z =4. Three strong hydrogen bonds were found in each unique unit between two tri(8 quinolinol) nickel fragments.展开更多
文摘目前,锂离子电池的安全问题越来越受到各界关注。为此,采用C80微量量热仪对镍钴铝酸锂/钛酸锂电池的主要电池材料体系进行热稳定性测试,采用ARC进行镍钴铝酸锂/钛酸锂电池的热失控试验,两相结合分析镍钴铝酸锂/钛酸锂电池体系的热稳定性。研究发现,电池热失控的温度(171℃)与隔膜的熔断温度(168.62℃)相近,LTO/电解液体系的活化能(75.43 k J/mol)远低于NCA/电解液体系(246.97 k J/mol),但NCA/电解液体系的发热量(908.42 J/g)却远高于LTO/电解液体系(284.63 J/g)。由此表明,镍钴铝酸锂/钛酸锂电池的热失控过程为:隔膜熔断导致正负极短路,然后负极材料与电解液反应积累热量,进而导致正极材料与电解液反应大量放热。整个过程从引发至热失控达到最高温度用时仅45 s。
文摘褐藻寡糖具有多种生理活性,本研究通过酶解与分级条件的优化,获得了低分子质量褐藻寡糖的酶法制备工艺,并在体外模型上评价了不同分子质量组分的抗氧化活性。结果表明,优化后的褐藻寡糖制备条件为:底物浓度1.20%,酶底比4.35 U/mg,酶解时间4 h。进一步采用乙醇沉淀和超滤分离后,获得了重均分子质量分别为0.84、1.40、2.25和34.56 k Da的4种组分,其得率分别为50.82%、5.15%、11.48%和12.00%。各组分均具有一定的还原能力,可有效清除DPPH和羟自由基,其中低分子质量组分A的抗氧化活性最为显著,其清除羟自由基的能力与维生素C相近。
文摘A tri(8 quinolinol)nickel coordination compound, [Ni 2(HQ) 3Q 3] ClO 4, was synthesized and its crystal structure was determined by X ray diffraction. The crystal structure indicated a space group of P2 1/c with a =1.613 8(1) nm, b =1.590 0(1) nm, c =1.939 9(1) nm, β =94.663(2)°, V = 4.961 2(6) nm 3 and Z =4. Three strong hydrogen bonds were found in each unique unit between two tri(8 quinolinol) nickel fragments.
