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Related Concept Videos

Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Related Experiment Video

Updated: Dec 27, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Construct an Ultrathin Bismuth Buffer for Stable Solid-State Lithium Metal Batteries.

Fei Hu1, Yuyu Li1, Ying Wei1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China.

ACS Applied Materials & Interfaces
|February 25, 2020
PubMed
Summary
This summary is machine-generated.

A bismuth (Bi) buffer layer effectively reduces interfacial resistance between lithium metal anodes and lithium aluminum germanium phosphate (LAGP) solid-state electrolytes. This breakthrough enhances solid-state battery performance and safety by improving Li/LAGP compatibility.

Keywords:
Li1.5Al0.5Ge0.5P3O12bismuth bufferinterfacelithium metal batteriessolid-state electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • Lithium aluminum germanium phosphate (LAGP) is a promising solid-state electrolyte (SSE) for all-solid-state lithium-ion batteries (ASS-LIBs) due to its high ionic conductivity and dendrite suppression capabilities.
  • A major obstacle for LAGP application is the high interfacial resistance between lithium metal anodes and the LAGP SSE, stemming from unfavorable reactions and poor compatibility.
  • Addressing this interfacial challenge is crucial for realizing the potential of LAGP in next-generation energy storage.

Purpose of the Study:

  • To develop an effective strategy for mitigating the ultrahigh interfacial resistance between lithium metal anodes and LAGP solid-state electrolytes.
  • To improve the chemical and physical properties of the Li/LAGP interface for enhanced battery performance.
  • To demonstrate the feasibility of using a modified LAGP interface in a functional all-solid-state lithium-ion battery.

Main Methods:

  • A thin film of metallic bismuth (Bi) was deposited onto the LAGP solid-state electrolyte surface using sputtering.
  • Electrochemical impedance spectroscopy was employed to quantify the interfacial resistance before and after Bi modification.
  • A solid-state full cell utilizing a LiFePO4 cathode and the Bi-modified LAGP electrolyte was assembled and tested.

Main Results:

  • The introduction of a Bi buffer layer significantly reduced the interfacial resistance between lithium metal and LAGP from 2255.6 to 92.8 Ω cm² at 30 °C.
  • The Bi film effectively inhibited detrimental reactions between the lithium metal anode and the LAGP electrolyte, improving interfacial compatibility.
  • A functional all-solid-state full cell demonstrated good performance, validating the effectiveness of the Bi interfacial modification.

Conclusions:

  • Sputtering a thin bismuth film onto LAGP is a highly effective method for overcoming the interfacial resistance challenges with lithium metal anodes.
  • The Bi buffer layer enhances the stability and compatibility of the Li/LAGP interface, paving the way for practical ASS-LIBs.
  • This study presents a viable approach to address critical interfacial issues in solid-state batteries employing LAGP electrolytes.