Lithium Dendrite Formation at the Interface Between Lithium Metal and PEO Complexed with Various Lithium Salts

锂(药物) 钝化 电解质 材料科学 枝晶(数学) 无机化学 金属 聚合物 电化学 盐(化学) 介电谱 化学工程 电极 化学 纳米技术 有机化学 复合材料 冶金 图层(电子) 物理化学 医学 几何学 数学 内分泌学 工程类
作者
Hui Wang,Masaki Matsui,Yasuo Takeda,Osamu Yamamoto,Nobuyuki Imanishi
出处
期刊:Meeting abstracts 卷期号:MA2014-04 (3): 522-522
标识
DOI:10.1149/ma2014-04/3/522
摘要

A water-stable lithium electrode (WSLE) based on Li 1 +x+y (Ti,Ge) 1 -x Al x P 3-y Si y O 12 (LTAP) requires a lithium conducting interlayer between lithium metal and LTAP. Polyethylene oxide (PEO) based polymer electrolytes are the best candidate as the interlayer, because they are stable in contact with lithium metal and large-sized sheets can be easily fabricated. The interface resistance between lithium metal and polymer electrolytes in the WSLE was found to exhibit a major part of the electrode resistance [1], which can be suppressed by addition of ionic liquids, nanofillers and oligomer ethers into PEO. Further, the passivation film may play an important role for the lithium dendrite formation [2], especially the anion of lithium salts is expected to participate in forming the surface sublayer adjacent to lithium metal, whose role for the lithium dendrite formation is yet unveiled. In this study, the polymer electrolytes of PEO 18 LiX with different lithium salts of LiN(FSO 2 ) 2 (LiFSI), LiN(CF 3 SO 2 ) 2 (LiTFSI), LiN(C 2 F 5 SO 2 ) 2 (LiBETI), and LiC(C 2 F 5 SO 2 ) 3 (LiTFSM) were prepared, and the effects of lithium salt in PEO on the interface resistance and the lithium dendrite formation have been examined. Electrochemical impedance spectroscopy measurements were performed in the symmetrical lithium pouch cells of Li/PEO 18 LiX/Li as a function of storage time at 60 o C. The passivation film resistances (R p ) for PEO 18 LiTFSM and PEO 18 LiTFSI increased from 75 to 135 Ω·cm 2 and 92 to 204 Ω·cm 2 after 148 h, respectively. On the other hand, R p for PEO 18 LiBETI and PEO 18 LiFSI decreased from 181 to 143 Ω·cm 2 and 372 to 278 Ω·cm 2 , respectively after 148 h. The capacitance of the passivation film was in a descending order of PEO 18 LiTFSM, PEO 18 LiTFSI, PEO 18 LiBETI and PEO 18 LiFSI. Activation energies for the total interfacial resistance were calculated as 84.4 kJ·mol -1 for PEO 18 LiFSI, 84.1 kJ·mol -1 for PEO 18 LiTFSI, 85.8 kJ·mol -1 for PEO 18 LiBETI, and 90.9 kJ·mol -1 for PEO 18 LiTFSM. These results imply that FSI - could take part in the generation of a dense resistive passivation film. The short-circuit time (t s ) for the Li/PEO 18 LiX/Li cell was examined at 0.1 mA·cm -2 and 60 o C, where the thickness of PEO 18 LiX was ca. 100 μm. Figure 1 shows the potential change with the polarization period for the Li/PEO 18 LiX/Li cell at 60 o C. The longest t s of 145 h was observed for the Li/PEO 18 LiFSI/Li cell with over-potential of 55 mV. t s for the Li/PEO 18 LiTFSI/Li cell was 63.7 h and the over-potential 62 mV. However, cells of Li/PEO 18 LiTFSM/Li and Li/PEO 18 LiBETI/Li were shorted at 3.2 and 8.7 h and the over-potentials were 32 and 40 mV, respectively. The cycling performance measurements were carried out for the Li/PEO 18 LiTFSI/Li and Li/PEO 18 LiFSI/Li cells at 0.1 mA·cm -2 and 60 o C, where the current was passed for 5 h in each half cycle. The total charge passed before short-circuit was calculated as 19.8 C·cm -2 for PEO 18 LiTFSI and 70.2 C·cm -2 for PEO 18 LiFSI. These results suggest that FSI - is a promising anion for suppressing lithium dendrite formation and enhancing the flexibility of the passivation film. Detailed study of the composition of the passivation film on the lithium metal is under investigation by in-situ FTIR, ex-situ XPS and SEM. We attempt to correlate lithium dendrite formation with anions of novel lithium salts for the development of WSLEs. References [1] T. Zhang, N. Imanishi, O. Yamamoto, et al., J. Electrochem. Soc. , 155 , A965 (2008). [2] H. Wang, O. Yamamoto, N. Imanishi, et al., J. Electrochem. Soc. , 160 , A728 (2013).

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
咕咕鸽完成签到,获得积分10
刚刚
Jasper应助直率的颜演采纳,获得10
刚刚
1秒前
在水一方应助善良的天德采纳,获得10
1秒前
2秒前
2秒前
2秒前
2秒前
2秒前
寒冷寻桃完成签到 ,获得积分10
3秒前
3秒前
3秒前
wjx发布了新的文献求助10
3秒前
3秒前
wjx发布了新的文献求助10
3秒前
3秒前
海派Hi完成签到 ,获得积分10
3秒前
xyj6486发布了新的文献求助10
4秒前
煎饼发布了新的文献求助10
4秒前
听雨发布了新的文献求助10
4秒前
NexusExplorer应助靓丽芙蓉采纳,获得10
4秒前
5秒前
6秒前
7秒前
Xenia完成签到 ,获得积分10
7秒前
7秒前
在望完成签到,获得积分0
7秒前
7秒前
7秒前
7秒前
7秒前
木可完成签到,获得积分10
8秒前
wjx发布了新的文献求助10
8秒前
嘟嘟完成签到,获得积分20
8秒前
wjx发布了新的文献求助10
8秒前
wjx发布了新的文献求助10
9秒前
wjx发布了新的文献求助10
9秒前
wjx发布了新的文献求助10
9秒前
wjx发布了新的文献求助10
9秒前
wjx发布了新的文献求助10
9秒前
高分求助中
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
Effective Learning and Mental Wellbeing 300
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3974943
求助须知:如何正确求助?哪些是违规求助? 3519467
关于积分的说明 11198482
捐赠科研通 3255728
什么是DOI,文献DOI怎么找? 1797904
邀请新用户注册赠送积分活动 877261
科研通“疑难数据库(出版商)”最低求助积分说明 806224