Dissolution of Lithium Metal in Poly(ethylene oxide)

被引：27

作者：

Galluzzo, Michael D. ^{[1
,2
]}

Halat, David M. ^{[1
,3
]}

Loo, Whitney S. ^{[1
]}

Mullin, Scott A. ^{[1
]}

Reimer, Jeffrey A. ^{[1
,2
]}

Balsara, Nitash P. ^{[1
,2
,3
]}

机构：

[1] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, JCESR, Berkeley, CA 94720 USA

来源：

ACS ENERGY LETTERS | 2019年 / 4卷 / 04期

关键词：

SOLID POLYMER ELECTROLYTES; TRANSFERENCE NUMBERS; ALKALI-METALS; BEHAVIOR; CONDUCTIVITY; ANODE;

D O I：

10.1021/acsenergylett.9b00459

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate that lithium metal is sparingly soluble in poly(ethylene oxide) (PEO). Li-7 NMR shows that when a PEO sample is placed in contact with lithium metal at elevated temperatures, a lithium species dissolves and diffuses into the bulk polymer. A lithium/PEO/lithium electrochemical cell, containing no lithium salts, shows increasing conductivity over time when annealed at 120 degrees C. Chronoamperometry shows that the annealed cell obeys Ohm's law, implying that conduction occurs without the development of concentration gradients. To explain the results, it is proposed that atomic lithium dissolves into PEO, where it exists as a lithium cation and free electron. The dissolution of lithium also affects the phase behavior of block copolymer electrolytes. These observations explain the strong adhesion between lithium metal and PEO and have important implications for lithium metal battery systems that contain PEO-based electrolytes.

引用

页码：903 / 907

页数：9

共 32 条

[1] An EIS study of the anode Li/PEO-LiTFSI of a Li polymer battery [J].

Bouchet, R ;

Lascaud, S ;

Rosso, M .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (10) :A1385-A1389

[2] SOLUTIONS OF ALKALI METALS IN POLYETHERS .1. [J].

CAFASSO, F ;

SUNDHEIM, BR .

JOURNAL OF CHEMICAL PHYSICS, 1959, 31 (03) :809-813

[3]

Carter G., 1977, Metallic Shifts in NMR: A Review of the Theory and Comprehensive Critical Data Compilation of Metallic Materials

[4] ANALYSIS OF TRANSFERENCE NUMBER MEASUREMENTS BASED ON THE POTENTIOSTATIC POLARIZATION OF SOLID POLYMER ELECTROLYTES [J].

DOYLE, M ;

NEWMAN, J .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1995, 142 (10) :3465-3468

[5] The alkali metals: 200 years of surprises [J].

Dye, James L. .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2015, 373 (2037)

[6] ELECTROCHEMICAL MEASUREMENT OF TRANSFERENCE NUMBERS IN POLYMER ELECTROLYTES [J].

EVANS, J ;

VINCENT, CA ;

BRUCE, PG .

POLYMER, 1987, 28 (13) :2324-2328

[7] LITHIUM ELECTRODE PEO-BASED POLYMER ELECTROLYTE INTERFACE BEHAVIOR BETWEEN 60-DEGREES-C AND 120-DEGREES-C [J].

FAUTEUX, D .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1988, 135 (09) :2231-2237

[8] COMPLEXES OF ALKALI-METAL IONS WITH POLY(ETHYLENE OXIDE) [J].

FENTON, DE ;

PARKER, JM ;

WRIGHT, PV .

POLYMER, 1973, 14 (11) :589-589

[9] Promises, Challenges, and Recent Progress of Inorganic Solid-State Electrolytes for All-Solid-State Lithium Batteries [J].

Gao, Zhonghui ;

Sun, Huabin ;

Fu, Lin ;

Ye, Fangliang ;

Zhang, Yi ;

Luo, Wei ;

Huang, Yunhui .

ADVANCED MATERIALS, 2018, 30 (17)

[10] A SAXS/WAXS/GISAXS Beamline with Multilayer Monochromator [J].

Hexemer, Alexander ;

Bras, Wim ;

Glossinger, James ;

Schaible, Eric ;

Gann, Eliot ;

Kirian, Rick ;

MacDowell, Alastair ;

Church, Matthew ;

Rude, Bruce ;

Padmore, Howard .

XIV INTERNATIONAL CONFERENCE ON SMALL-ANGLE SCATTERING (SAS09), 2010, 247

← 1 2 3 4 →