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中南大学学报(自然科学版)

Journal of Central South University

第35卷    第4期    总第158期    2004年8月

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文章编号:1672-7207(2004)04-0604-05
全固态碱性Cd/Ni二次电池的制备及其性能
陈国平1,陈宝激2,桑商斌3,杨占红3,唐有根3,伍秋美3,李晓刚3

(1.黄山学院化学系,安徽黄山,245021;
2.新乡中新化工有限责任公司,河南新乡,453800;3.中南大学化学化工学院,湖南长沙,
410083
)

摘 要: 用溶液浇铸法制备含有聚乙烯醇(PVA)/羧甲基纤维素(CMC)聚合物、KOH和水的复合碱性固态聚合物电解质PVA/CMC/KOH/H2O。采用扫描电镜,循环伏安和交流阻抗技术研究PVA/CMC/KOH/H2O的特性。研究结果表明:在室温时, PVA/CMC/KOH/H2O离子电导率最高可达7.1×10-2S·cm-1;在循环伏安曲线上,在0.15,-0.30和-0.70 V时出现明显的氧化还原峰。以PVA/CMC/KOH/H2O为电解质组装的电池,当以1 mA/cm2的电流密度放电时,在1.10~1.40 V有放电平台出现;当以3 mA/cm2电流密度充、放电时,电池经过42次循环后,充、放电效率为88%~95%,表明PVA/CMC/KOH/H2O电解质具有较强的稳定性;电池内阻随着充电过程的进行逐步降低,随着放电过程的进行急剧增大;内阻的增加除了与电极充放电状态有关外,还与外加电场对电解质的影响有关。

 

关键字: 固态碱性电池;碱性固态聚合物电解质;聚乙烯醇/羧甲基纤维素;Ni/Cd电池

Preparation of solid state alkaline Cd/Ni second cell and its properties
CHEN Guo-ping1, CHEN Bao-ji2,SANG Shang-bin3,YANG Zhan-hong3,
TANG You-gen3,WU Qiu-mei3,LI Xiao-gang3

1. Department of Chemistry, Huangshan College, Huangshan 245021, China;
2.Xinxiang Zhongxin Chemical Limited Liability Company, Xinxiang 453800, China;
3. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:A alkaline solid-state polymer electrolyte composed of polyvinyl alcohol(PVA)/carboxy-
methylcellulose(CMC) polymer, KOH and H2O was prepared by solution casting method. The ionic conductivity of alkaline composite PVA/CMC/KOH/H2O polymer electrolyte at room temperature is the highest, 7.1×10-2S·cm-1. The morphology and electrochemistry performances of composite PVA/CMC/KOH/H2O polymer electrolytes were studied by scanning electron microscope(SEM),cyclic voltammetry(CV) and alternating current impedance methods, respectively. The results show that there are redox peaks at 0.15, -0.30 and -0.70 V on the CV curves, respectively, and those redox peaks may result from the reaction of active group of the polymer. The discharge voltage plateau of 1.10 1.40 V at 1 mA/cm2 was observed for the cell with Ni/Cd electrode and PVA/CMC/KOH/H2O electrolytes; after the cell being charged/discharged for 42 times at 3 mA/cm2, the charge-dis-charge efficiency is 88% 95%. These results indicate that the electrolyte exhibits good stability. It is also found that the inner electric resistance of this cell is decreased in the charge process and significantly increased in the discharge process. The variation of inner electric resistance of this cell is related to not only the charge but also discharge state of electrode and the effect of extra electric field on the solid state electrolyte.

 

Key words: solid state alkaline cell; alkaline solid polymer electrolyte; PVA/CMC polymer;Cd/Ni cell

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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