摘要
全固态薄膜锂离子电池具有易微型化与集成化等优点,因此,非常适合为微系统供电。负极对全固态薄膜锂离子电池的性能有重要影响。现有电池通常采用金属锂作为负极,然而其枝晶生长问题及低的热稳定性限制了相应电池在工业、军事等高温、高安全场合应用。为此,本文系统研究了LiNbO_(3)薄膜的电化学性能,结果表明:LiNbO_(3)薄膜呈现高比容量(410.2 mAh·g^(-1))、高倍率(30C时比容量80.9 mAh·g^(-1))和长循环性能(2000圈循环后的容量保持率为100%),以及高的室温离子电导率(4.5×10^(-8)S·cm-1)。在此基础上,基于LiNbO_(3)薄膜构建出全固态薄膜锂离子电池Pt|NCM523|LiPON|LiNbO_(3)|Pt,其展现出较高的面容量(16.3μAh·cm^(-2))、良好的倍率(30μA·cm^(-2)下比容量1.9μAh·cm^(-2))及长循环稳定性(300圈循环后的容量保持率为86.4%)。此外,该电池表现出优秀的高温性能,连续在100℃下工作近200 h的容量保持率高达95.6%。研究表明:LiPON|LiNbO_(3)界面不论在充放电循环还是高温下均非常稳定,这有助与提升全电池综合性能。
Owing to their remarkable miniaturization and integration capabilities,all-solid-state thin-film lithium-ion batteries are quite appropriate as the on-chip power for microsystems,such as implantable medical devices,micro-electro-mechanical systems and integrated circuits.The performance of the all-solid-state thinfilm lithium-ion batteries is greatly determined by the anode film.Metal Li is usually adopted as the anode material,however,the issues,including Li dendrite growth and poor thermal stability,hinder its applications in the high-temperature and high-safety fields,such as industrial and military.Therefore,various anode materials have been investigated in recent years.Unfortunately,few anode materials can achieve high specific capacity and good stability simultaneously.Due to its relatively high specific capacity and good electrochemical stability,LiNbO_(3) has been widely used as a coating layer in the batteries and has been demonstrated to effectively suppress side reactions at the electrode|electrolyte interface.However,there is still lack of deep understanding of the electrochemical characteristics of LiNbO_(3);also,no previous work has been performed to explore the applications of LiNbO_(3) in the all-solid-state thin-film lithium-ion batteries.In this work,the electrochemical characteristics of LiNbO_(3) as a new anode material are carefully investigated.It is found that the LiNbO_(3) anode has relatively high specific capacity(410.2 mAh∙g^(-1)),high rate capability(80.9 mAh∙g^(-1) at 30C),good cycling stability(100%capacity retention over 2000 cycles at 1C)and high ionic conductivity(4.5×10-8 S∙cm-1 at room temperature).Moreover,an allsolid-state thin-film lithium-ion battery with a Pt current collector|NCM523 cathode|LiPON electrolyte|LiNbO_(3) anode|Pt current collector configuration is also prepared.This full battery presents good performance in terms of its relatively high area capacity(16.3μAh∙cm^(-2) at a current density of 0.5μA∙cm^(-2)),good rate characteristic(1.9μAh∙cm^(-2)
作者
胡雪晨
夏求应
岳钒
何欣怡
梅正浩
王金石
夏晖
黄晓东
Xuechen Hu;Qiuying Xia;Fan Yue;Xinyi He;Zhenghao Mei;Jinshi Wang;Hui Xia;Xiaodong Huang(Key Laboratory of MEMS of the Ministry of Education,School of Integrated Circuits,Southeast University,Nanjing 210096,China;School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2024年第2期89-95,共7页
Acta Physico-Chimica Sinica
基金
国家重点研发计划(2020YFB2007400)资助项目。
关键词
全固态锂离子电池
LiNbO3薄膜
负极
界面
高温
稳定性
All-solid-state lithium-ion battery
LiNbO3 film
Anode
Interface
High temperature
Stability
