Title: In Situ Formation of Li ₃ P Layer Enables Fast Li ⁺ Conduction across Li/Solid Polymer Electrolyte Interface

Abstract

Abstract Solid‐state polymer electrolytes provide better flexibility and electrode contact than their ceramic counterparts, making them a worthwhile pursuit for all‐solid‐state lithium‐metal batteries. However, their large Li/solid state electrolyte interfacial resistance, small critical current density, and rapid lithium dendrite growth during cycling still limit their viability. Owing to these restrictions, all‐solid‐state cells with solid polymer electrolytes must be cycled above room‐temperature and with a small current density. These problems can be mitigated with an in situ formed artificial solid electrolyte interphase that rapidly conducts Li ⁺ ions. Herein, a Li ₃ P layer formed in situ at the Li‐metal/solid polymer electrolyte interphase is reported that significantly reduces the electrode/electrolyte interfacial resistance. Additionally, this layer increases the wettability of the solid polymer by the metallic lithium anode, allowing for the critical current density of lithium symmetric cells to be doubled by homogenizing the current density at the interface. All‐solid‐state Li/Li symmetric cells and Li/LiFePO ₄ cells with the Li ₃ P layer show improved cycling performance with a high current density.

Authors:

Wu, Nan ^[1]; Li, Yutao ^[2]; Dolocan, Andrei ^[2]; Li, Wei ^[3]; Xu, Henghui ^[2]; Xu, Biyi ^[2]; Grundish, Nicholas S. ^[2]; Cui, Zhiming ^[3]; Jin, Haibo ^[4]; Goodenough, John B.  ^[2]

• Search DOE PAGES for author "Goodenough, John B."
• Search DOE PAGES for ORCID "0000-0001-9350-3034"

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+ Show Author Affiliations

1. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science &, Engineering Beijing Institute of Technology Beijing 100081 P. R. China, Materials Research Program and the Texas Materials Institute ETC9.184 The University of Texas at Austin Austin TX 78712 USA
2. Materials Research Program and the Texas Materials Institute ETC9.184 The University of Texas at Austin Austin TX 78712 USA
3. The Key Laboratory of Fuel Cell Technology of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 P. R. China
4. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science &, Engineering Beijing Institute of Technology Beijing 100081 P. R. China

Publication Date:

Mon Apr 06 00:00:00 EDT 2020

Sponsoring Org.:

USDOE

OSTI Identifier:

1608364

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Advanced Functional Materials

Additional Journal Information:

Journal Name: Advanced Functional Materials Journal Volume: 30 Journal Issue: 22; Journal ID: ISSN 1616-301X

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

Germany

Language:

English