Performance of lead-acid battery adding carbon nanotube in negative plate

研究添加不同含量碳纳米管(CnT)和炭黑对铅酸电池负极板电化学性能的影响。添加适量的CnT会增大负极内孔体积,改善活性材料的颗粒形态,使颗粒大小更均匀,提高电化学反应动力学性能。添加0.5%CnT时,1 C首次放电容量提高3%,并将极板2 C、60 S放电循环的寿命延长接近一倍,电池在SbA S 0101测试中的循环寿命也超过普通电池一倍。Effects of adding different amounts of carbon nanotube( CNT) and carbon black into negative plates in lead-acid battery were investigated.The negative plates with conductive carbon nanotube exhibited rich pore structure,better morphology and improved kinetic behavior.The addition of appropriate amount of CNT into negative plates was beneficial to improve discharge capacity and cycle life of the lead-acid battery under the condition of rapid charge-discharge processes.The initial discharge capacity of 1 C was increased 3%,the negative plate 2 C,60 s discharge cycle life was extended nearly doubled when adding 0.5% CNT,cycle life of the battery in SBA S 0101 test was also more than twice as ordinary battery.福建省软科学计划项目(2015R0077

Infl uence of composite material of carbon black and graphite on the performance of negative electrode of lead-acid battery

本文考察了加入不同含量混合炭材料(如炭黑与石墨)的铅酸电池负极的电化学性能。通过循环伏安测试,研究了炭材料对负极氧化还原性能与析氢电位的影响。通过扫描电镜测试,观察了负极微观形貌的变化。充放电测试结果表明,铅酸电池负极活性物质中炭材料的含量对其倍率放电性能具有重要影响。适量添加炭黑与石墨的混合材料,可以提高负极高倍率条件下的放电容量。当添加3%炭黑和2%石墨混合炭材料时,对负极充电时的析氢电位影响较小,10 C放电条件下得到较高容量。This paper observed and studied the electrochemical performance of negative electrode of lead-acid battery, while the negative electrode was added into different content of composite carbon material such as carbon black and graphite.The infl uences of carbon material on redox properties of negative electrode and hydrogen evolution potential were studied by cyclic voltammetry measurements.The micro morphology of negative electrode was characterized by SEM.The results of chargedischarge tests showed that when the carbon material was added into the active materials of negative electrode of lead-acid battery, its content had an important effect on the discharge performance.The composite material of proper content carbon black and graphite could improve the discharge capacity at high rates.When 3 wt% carbon black and 2 wt% graphite were added, the effect on hydrogen evolution potential is smaller during charging and the capacity is higher under the condition of 10C discharging.福建省软科学计划项目(2012R0076)资

活性炭对铅酸电池负极活性物质结构与性能的影响

本工作研究了在铅酸电池负极活性物质中添加高比表面积活性炭对其微观结构与性能的影响。模拟电池实验结果发现,添加0. 5%的SPC04型活性炭可以使负极1C、5C、10C的放电容量分别提高18. 36%、42. 68%、44. 01%,2C 60 s的放电循环寿命提高1倍。6-FM-9F型实际电池测试结果表明,不仅在部分荷电态高倍率(HRPSo C)充放电条件下电池的循环寿命得到了显著提高,而且在完全充放电下电池的循环寿命也得到了显著提高。负极活性物质的微观结构测试结果表明,活性炭材料的加入可以明显改变其颗粒形貌和孔隙结构,活性炭可以使负极活性物质颗粒及孔隙分布较为均匀,粒径大小适中,增加了活性物质颗粒间有效孔径范围(0. 4～3μm)的占比

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^