摘要
以酸化的Li2CO3为锂源,由水热法制得了部分外貌呈三维空间网状的LiFePO4/C纳米颗粒,在0.5C放电倍率下的最高放电比容量为143.4mAh/g,经100次循环后无衰减。用化学脱锂法制备了Li1-xFePO4(x=0、0.3、0.5、0.8、1)。用XRD和交流阻抗法对Li1-xFePO4进行了表征。研究表明,随着锂离子的脱出,存在LiFePO4/FePO4两相可逆变化,正负极表面阻抗的变化趋势是先增大后减小。
LiFePO4/C particles whose partial appearance was three dimensional network structure was prepared by hydrothermal method with that acidified Li2CO3 as the lithium resource.Its highest specific capacity was 143.4mAh/g and no capacity lost was found after 100charge-discharge cycles at 0.5C.Li1-xFePO4 were prepared by chemically delithiated method.Li1-xFePO4 were characterized by XRD and EIS.Results show that,with the increasing extraction of Li＋ from LiFePO4,XRD analysis of Li1-xFePO4 support the LiFePO4/FePO4 model.Surface resistance of cathode and anode increases at first and then decreases.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第7期1282-1285,共4页
Journal of Functional Materials
基金
青海省重点科技攻关资助项目(2006-G-168)
国家科技攻关计划滚动支持资助项目(2004BA602B-01)
