共查询到19条相似文献,搜索用时 62 毫秒
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以NaOH电解液代替KOH能够明显改善MH/N i电池的自放电性能和高温(60℃)充电效率.电化学阻抗和循环伏安测试表明,NaOH电解液的作用可能是改变了H原子于负极表面的吸(脱)附行为,并在一定程度上抑制了负极的析氢过程,从而改善了电池的自放电性能. 相似文献
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在硼氢化钾碱性溶液中对金属氢化物(MH)电极的表面进行化学还原处理,提高了MH电极的放电容量、活化性能和电催化活性.用其为负极组装的AA型MH-Ni电池进行了封口化成,电池放电容量达到1150mAh,5C下电池的放电容量达到0.2C下容量的80%以上,电池在1C100%DOD(放电深度)充放电条件下,循环寿命由原来的100次左右提高到200次以上 相似文献
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Ni-MH电池是近十几年来发展起来的一种新型可充式电池。本文介绍了Ni-MH电池的工作原理,并对金属氢化电极的性能及其影响因素做了详细的叙述,同时还对薄膜电极及固体电解质Ni-MH电池做了简单介绍。 相似文献
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MH/Ni电池充放电过程导电物理机制的研究 总被引:1,自引:0,他引:1
借助X射线衍射等方法, 研究了MH/Ni电池在充放电过程中电极活性材料β-Ni(OH)2和AB5合金的结构和微结构变化, 进而讨论了两种电极活性材料在充放电过程中的物理行为和导电的物理机制. 研究发现, 在充电过程中确实未观测到β-Ni(OH)2→β-NiOOH的相变, 只有在满充和过充时, 才发生部分β-Ni(OH)2转变成γ-NiOOH, 且一直是β-Ni(OH)2和γ-NiOOH两相共存; 在充电过程不是由β-Ni(OH)2→β-NiOOH相变来提供氢离子, 而是由氢原子离开β-Ni(OH)2的点阵位置提供氢离子; 在负极这一边, 开始时氢原子是以间隙式嵌入AB5点阵形成固溶体, 只有当AB5因氢原子的嵌入使其体积变化达一定百分数后才析出AB5Hx氢化物. 这些过程使电极活性材料的微结构也发生变化, 而且这种变化不是完全可逆的. 简言之, MH/Ni电池的物理导电机制是在正负极活性材料中嵌入和脱嵌的氢离子在电极间的定向迁移运动. 相似文献
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This paper deals with the design and development of bipolar Ni/MH batteries. After optimizing the parameters of bipolar plates by adjusting electrode thickness and modifying the capacity ratio of two adjacent electrodes of a single cell, some bipolar Ni/MH stacks with a voltage of 6 V were assembled and examined. Electrochemical testing results showed that the bipolar battery has excellent high rate discharge and recharge characteristics, satisfying pulse discharge performance even in a low state of charge (SOC). Moreover, the battery showed good stability during pulse cycles as simulating hybrid electric vehicle working conditions. It would be a promising alternative for power storage system in hybrid electxic vehicles. 相似文献
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锂离子电池硅-锰复合材料的电化学性能 总被引:3,自引:0,他引:3
The Si-Mn composites were synthesized by ball-milling mixtures of four different atomic ratios of Si/Mn. The phases of composites were analyzed with X-ray diffraction. Their charge-discharge performance as negative electrodes in Li-ion batteries were tested and the formation of SEI film was studied by differential capacity plots. The results show that materials prepared by ball-milling technology are composites consisting of Si and Mn. The insertion of lithium ions leads to the formation of amorphous Li-Si alloy. The initial reversible capacity and efficiency of Si-Mn composites are increased and the cycle life is enhanced obviously,especially after their heat treatment. The composite of Si∶Mn=4∶6 exhibits a reversible capacity of 546.0 mAh·g-1 and a charge-discharge efficiency of 70%. The reversible capacity maintains at 374.2 mAh·g-1 after 40 cycles. 相似文献
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LI Yi HAN Xiangbo LIANG Jicai LENG Xuning YE Kaiqi HOU Changmin YU Kaifeng 《高等学校化学研究》2015,31(3):332-336
TiO2 nanoflakes were prepared by hydrothermal precipitation method using Ti(SO4)2 as titanium source and NaOH solution as alkaline medium. Their surface morphology, grain size measured after high temperature calcination and effect on the electrochemical performance of Li ion battery were discussed. TiO2 nanoflakes were characterizated by means of transmission electron microscopy(TEM), X-ray powder diffraction(XRD), N2 adsorption-desorption isothermal assay, cyclic voltammetry(CV) and cycle performance test. The result of electrochemical performance test shows that the prepared TiO2 nanoflakes have high discharge specific capacity and good cycle performance. Discharge specific capacity for the first circle at the discharge rate of 0.1 C is 261.5 mA·h·g-1. After 90 cycles, the discharge capacity reduces to 172.2 mA·h·g-1. 相似文献
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锂离子电池正极材料的晶体结构及电化学性能 总被引:6,自引:0,他引:6
正极材料是锂离子电池的重要组成部分。作为提供自由脱嵌锂离子的正极材料,其晶体结构的特点决定了锂离子脱嵌路径方式的不同,并对锂离子电池的电化学性能等产生明显影响。本文根据正极材料的晶体结构和锂离子“脱嵌/嵌入”路径方式的不同,重点讨论了一维隧道结构、二维层状结构和三维框架结构正极材料的晶体结构特点、锂离子“脱嵌/嵌入”路径和其电化学性能之间的关系,主要包括一维隧道结构正极材料LiFePO4,二维层状结构正极材料LiMO2(M=Co, Ni, Mn)、Li1+xV3O8和Li2MSiO4 (M=Fe, Mn) 以及三维框架结构正极材料LiMn2O4和Li3V2(PO4)3。揭示了目前锂离子电池正极材料的研究现状和存在问题,并对今后的发展方向进行了评述。 相似文献
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采用水热法,在200℃,S/Mo摩尔比为4.3∶1的条件下,水热反应24 h,合成出由MoS_2纳米片堆积而成的花墙状多级纳米结构.利用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)和X射线光电子能谱仪(XPS)等对产物物相和形貌进行了表征.结果表明,MoS_2纳米片厚度约为10 nm,花墙状多级纳米结构可达十至数十微米,具有较好的均匀性.MoS_2多级纳米结构作为锂离子电池负极材料,在高电流密度下表现出良好的循环稳定性. 相似文献
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Z. L. Zhang M. H. Zhong F. M. Liu F. P. Zhong F. Wu 《Journal of Thermal Analysis and Calorimetry》1999,58(2):413-419
An apparatus to study the battery system has been set up. The thermal effects of charge and discharge of Ni-MH batteries have been studied. The calorimetric measurements indicate that the net heat dissipation during charging is larger than that during discharging. It is observed that the ratio of heat dissipation to charging energy varies with charging capacity, and almost 90 percent of charging energy is lost as heat dissipation near the end of the charging process at 97.7 mA. A jump of thermal curve near the end of discharge due to a secondary electrode reaction has been observed.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献