共查询到19条相似文献,搜索用时 140 毫秒
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金属氢化物-镍电池用隔膜的研究进展 总被引:5,自引:0,他引:5
评述了尼龙纤维、丙纶纤维和维纶纤维等氢镍电池用隔膜的性能.对这些聚合物进行改性处理,可以改善隔膜的亲水性和吸碱能力,从而提高隔膜的性能.具有OH-交换功能的聚合物隔膜可以将电解液完全吸附于其中,使电解液中的氢氧根只能在隔膜中自由移动,同时阻止电池正、负极金属离子向对方的迁移,从而有效降低电池自放电及延长电池循环寿命.指出聚合物隔膜将成为未来隔膜的研究重点,其中选择合适的骨架材料,探索合适的接枝条件,提高聚合物链段的运动能力是今后的研究方向. 相似文献
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采用干 /湿相转化法制备了用于锂离子电池的复合型聚合物隔膜。通过扫描电镜和吸液实验研究了添加不同无机纳米粉料对由该法制得的聚合物隔膜孔径及结构的影响。用 8种隔膜组装了电池 ,测试了其电化学性质。结果证实无机纳米材料的加入导致了隔膜形成后在孔径大小、孔径分布和孔隙率等结构参数上的差异 ,添加无机纳米材料的隔膜具有适宜的孔结构和较好的充放电性能 ,具有实际应用价值 相似文献
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为了改善锂电隔膜的耐热性、电解液亲和性和机械性能,本文以聚丙烯腈为主要材料,采用相转化法制备了聚酯无纺布支撑的聚丙烯腈微孔复合锂电隔膜,对隔膜的理化性能(孔道结构、机械性能、电解液性能和耐热性)和电池性能(循环性能、倍率性能)进行系统研究。结果表明,复合隔膜具有均匀的微孔结构,平均孔径约为425nm,孔隙率为74%,拉伸强度为30MPa;电解液亲和性良好,吸液率为385%,接触角接近0°,锂离子电导率较市售隔膜显著提高,达到1.65mS/cm;在150℃、0.5h的热处理条件下,复合隔膜的热收缩率为0。鉴于良好的理化特性,该隔膜所装配的钴酸锂/锂金属电池表现出优异的循环容量和倍率容量保持性,如在0.2C倍率下,经历200次循环后电池的放电容量保持率为95.2%,在10C倍率下电池的放电容量为0.5C倍率下的58.3%。因此,相转化法制备的聚丙烯腈基微孔复合隔膜在锂离子电池中显示出较好的应用前景。 相似文献
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以可溶性聚酰亚胺树脂为原料,通过相转化法制备新型锂电隔膜,对其形貌、孔道结构、电解液亲和性、热稳定性和电池性能进行测试。结果显示,该隔膜表面具有均匀的微孔结构,表面孔为1~2μm,内部为发达的海绵状三维孔道结构,隔膜的平均孔径约为420 nm,孔隙率为72%,达到市售聚乙烯隔膜的2倍;该隔膜显示出良好的电解液亲和性,吸液率达到345%,为聚乙烯隔膜的3倍;该隔膜具有优异的耐热性,经过150℃、40 min的热处理后结构未发生明显变化。基于良好的亲和性和耐热性,与聚乙烯隔膜对照,聚酰亚胺基三维孔道隔膜所装配电池发挥出更好的充放电性能。 相似文献
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介绍了AGM隔板的定义、发展历程、特性、制造技术及标准修订情况。重点介绍了AGM隔板性能与产品性能的关系、AGM隔板的市场需求和未来的发展方向。随着铅酸蓄电池在人类对风能、太阳能、潮汐能、地热能等自然能的开发利用和电动汽车产业的发展中发挥越来越重要的作用,AGM隔板也将会有更大的发展。 相似文献
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Application of a novel gelled-electrolyte in valve-regulated lead-acid batteries with tubular positive plates 总被引:1,自引:0,他引:1
Zheng Tang Jian-Ming Wang Xian-Xian Mao Quan-Qi Chen Chen Shen Jian-Qing Zhang 《Journal of Applied Electrochemistry》2007,37(10):1163-1169
A polysiloxane-based gel electrolyte (PBGE) was prepared and used as a novel gel electrolyte in valve-regulated lead-acid
(VRLA) batteries with tubular positive plates. Cyclic voltammetry (CV) and scanning electron microscopy (SEM) indicated that
PBGE is more stable than fumed-silica gel electrolyte (FSGE). The properties of AGM (absorptive glass mat)-PBGE and PVC-FSGE
tubular batteries were investigated by electrochemical techniques. The results showed that the AGM-PBGE tubular batteries
have higher initial discharge capacity and better high-low temperature performance than PVC-FSGE. The improved electrochemical
performance of the AGM-PBGE batteries may result from the high charge efficiency and the open three-dimensional network structure
of PBGE. SEM and X-ray diffraction (XRD) spectroscopy showed that PBGE facilitates the conversion of the active-mass to lead
dioxide, presenting a high formation efficiency. The addition of PBGE instead of FSGE not only simplifies the manufacturing
process of tubular gel batteries, but also improves the utilization efficiency of positive active material (PAM), thus enhancing
the battery performance and reducing the manufacturing cost. 相似文献
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利用分相法制备了Na2O B2O3 SiO2 Al2O3 TiO2系统的多孔玻璃微珠。研究发现:当其他条件不变的情况下,随着分相温度从590℃到610℃,分相时间从24h到48h,玻璃微珠的平均孔径都在增大;当盐酸的浓度小于0.5mol/L时,玻璃微珠的孔径随着酸浓度由0.1mol/L到0.5mol/L的增加而增加;当盐酸的浓度在0.5mol/L到1mol/L时,玻璃微珠的孔径随着酸浓度的增加反而减小。当Al2O3的质量分数由0.5%增加到1.5%,玻璃微珠孔径在减小;当TiO2的质量分数由0.5%增加到1.5%,孔径则反而在增大。当玻璃的质量分数为Na2O7.50%,B2O329.20%,SiO261.80%,Al2O31.5%和TiO20.5%时,分相温度590℃和时间为24h,酸浓度和处理时间为0.1mol/LHCl和48h时,可制备出孔径分布小于50nm的光催化载体材料。 相似文献
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《Ceramics International》2020,46(9):13677-13684
The rechargeable magnesium-ion batteries are one of the emerging alternatives of lithium-ion batteries as it has a high volumetric capacity, non-toxic nature and a divalent charge of Mg-ions. The design of an excellent performing magnesium-ion battery requires a stable electrolyte system with high ionic conductivity. However, there is a lack of understanding of how different materials affect the properties of separators in terms of ionic conductivity and stability. In the present study, an attempt has been made to compare the physical and electrochemical characteristics of glass-ceramic and polypropylene membranes as separators in the magnesium-ion battery, using magnesium bis(trifluoromethanesulfonimide) and propylene carbonate as an organic electrolyte. The characterization like X-ray diffraction, field emission electron microscopy, electrolyte uptake, ionic conductivity, voltage stability, thermal stability and transference number are thoroughly examined for both the membranes. The glass-ceramic electrolyte system showed significantly higher ionic conductivity of 9.22 mS cm−1 at room temperature as compared to the polypropylene membrane. Additionally, the glass-ceramic electrolyte system showed higher thermal and voltage stability. 相似文献
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通过系统改变纵向(MD)、横向(TD)拉伸温度,制得了经不同拉伸温度双向拉伸后的湿法隔膜,并通过扫描电子显微镜(SEM)、透气度仪、泡点法膜孔径分析仪对湿法隔膜表观形貌、孔隙结构、透气性能进行了表征和测试,此外利用差示扫描量热仪(DSC)表征了湿法隔膜内部微观晶体的结晶度。结果表明,纵向拉伸温度的改变几乎对湿法隔膜孔径无影响,湿法隔膜孔径只与横向拉伸温度密切相关,随着横向拉伸温度由90 ℃升高至120 ℃,孔径由18.3 nm增大至45.4 nm;受孔径的影响,湿法隔膜的透气度由149.8 s降低至62.2 s,两者呈现较好的线性关系;当横向拉伸温度为120 ℃时,湿法隔膜内部发生熔融重结晶,结晶度由之前的17 %增大至20 %,此时湿法隔膜内部为由串晶构成的三维网络结构。 相似文献
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Polyether gel‐filled poly(vinylidene fluoride) separators (GF‐PVDF separators) were prepared by means of thermal crosslinking of poly(ethylene glycol) methyl ether acrylate (PEGMEA) and poly(ethylene glycol) diacrylate (PEGDA) as gel constituents. The intrinsic properties of GF‐PVDF and their corresponding gel polymer electrolyte (GPE) were characterized by SEM, DSC, and electrochemical methods. It was found a relatively better GPE could be got when the filled polyether content no more than 60 wt % and its ion conductivity could reach 1.3 × 10?3 S cm?1. The GPE is compatible with anode and cathode of lithium ion battery at high voltage and its electrochemical window is 4.6 V (vs. Li/Li+). The coulombic efficiency could reach 94% after 100 cycles for the cells using such GPE. The results reveal that the composite polymer electrolyte qualifies as a potential application in lithium cells. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44473. 相似文献