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A new additive of sodium hexametaphosphate (SHMP) was introduced to the paste of zinc electrode, with the purpose of preventing
the zinc active materials from agglomerating and improving the stability of batteries. The properties of the zinc electrodes
were characterized by scanning electron microscopy (SEM), constant current charge/discharge measurement, self-discharge test
and hydrogen collection experiment. The photographs of zinc electrode show that SHMP can significantly break up the agglomeration,
uniformize the particle distribution and increase the surface area, which are advantageous to improve the electrochemical
performance of zinc electrode. The experimental battery shows a 97 times cycling life and a 30.2% remaining capacity after
4 d storage. The hydrogen collection experimental results indicate that the SHMP can decrease the ratio of hydrogen evolution.
Therefore, the corrosion of zinc electrode is suppressed and the charge/discharge efficiency is enhanced. 相似文献
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为改善密封锌镍蓄电池在多次充放电循环后锌负极的变形及脱粉问题,提高锌镍蓄电池的电化学性能,对其锌负极的黏结剂进行了研究。介绍了CMC+PTFE、CMC+SBR、HPMC+SBR3种不同组分的黏结剂对锌负极的制备工艺和锌镍电池电化学性能的影响。研究发现:锌负极制备过程中采用适量HPMC+SBR黏结剂可明显提高锌负极浆料的分散性,促进负极中活性物质的均匀分布,减少锌负极浆料在制浆和涂浆过程中的结团现象,增加锌负极在干燥后的柔软性及弹性,极大地减少了多次充放电循环后锌负极的变形及脱粉,提高了电池高温存储性能,延长了电池循环寿命。 相似文献
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在摩尔比为0.66:0.17:0.17的AlCl3-NaCl-KCl共融盐中添加表面活化剂四甲基氯化铵(TMA),接通直流电在铁片上获得了Al镀层.用扫描电子显微分析、X射线衍射分析和极化曲线等技术测试镀层的表面形貌、相结构及耐腐蚀性能,并用循环伏安法研究添加TMA对Al电沉积机理的影响.研究表明,添加1.0 mass%TMA时,电镀电流效率高达93.6%;纯氯化物熔盐中所得Al晶粒呈针状,为(200)面高择优取向的面心立方结构,添加TMA后获得的Al晶粒细化且形状不规则,呈无序晶面取向.添加TMA后,Al镀层的点腐蚀电位提高了0.12 V,同时增加了电沉积反应的不可逆程度,利于Al在熔融盐中的电镀. 相似文献
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Al-Mn合金镀层的微观结构及耐蚀性 总被引:1,自引:0,他引:1
在AlCl3-NaCl-KCl低温共融盐中,添加无水MnCl2,接通直流电在铁片上获得Al—Mn合金镀层。用扫描电镜、能量色散谱、X射线衍射和极化曲线对分别对该合金镀层的形貌、组成、相结构及耐腐蚀性能进行测试。结果表明:纯铝镀层表面呈针状,锰质量分数9.20%的镀层表面呈花状,锰质量分数25.43%的镀层表面有无规则瘤节状凸起物且晶界模糊,而锰质量分数达到34.42%时,晶粒细化,晶界清晰;合金镀层中锰质量分数与熔盐中无水MnCl2的质量分数呈线性关系;锰质量分数为20.84%~29.74%的镀层为单一的非晶态结构,锰质量分数高于29.74%的镀层为Al8Mn5晶体与非晶态的双相结构;合金镀层的点蚀电压比纯铝镀层高180~360mV,单相非晶态合金镀层的耐蚀性优于双相镀层。 相似文献