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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Facilely Constructing Li₃P/Fe Dual-Conductive Interface for High-Performance Garnet-Based Solid-State Lithium Metal

Chuanlin Liu¹, Sifei Min¹, Wan Yuan¹

¹School of Physics and Materials Science, Nanchang University, Nanchang 330031, Jiangxi, China.

ACS Applied Materials & Interfaces

|May 26, 2026

Summary

Researchers developed a novel interface for solid-state lithium metal batteries using FeP coating on LLZTO. This Li3P/Fe layer enhances ionic conductivity, suppresses dendrites, and enables stable cycling for over 2200 hours.

Keywords:

LLZTO Li3P/Fe dual-conductive interface cycling stability electrochemical performance interface engineering solid-state lithium metal batteries

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Area of Science:

Materials Science
Electrochemistry
Solid-State Batteries

Background:

Garnet-type Li6.4La3Zr1.4Ta0.6O12 (LLZTO) is a promising solid-state electrolyte for lithium metal batteries.
Poor interfacial contact and lithium dendrite growth limit LLZTO's practical application in solid-state lithium metal batteries (SSLMBs).

Purpose of the Study:

To engineer a stable and conductive interface for LLZTO-based solid-state lithium metal batteries.
To overcome interfacial resistance and dendrite formation issues in SSLMBs.

Main Methods:

A solution-coating strategy was employed to deposit FeP on the LLZTO surface.
An in situ reaction between molten lithium and FeP formed a Li3P/Fe composite interfacial layer.
Electrochemical performance was evaluated using symmetric cells and LiFePO4 (LFP) cathode-based full cells.

Main Results:

The Li3P/Fe interface exhibited mixed ionic and electronic conductivity, significantly reducing interfacial impedance.
The modified interface effectively suppressed lithium dendrite nucleation and penetration.
Symmetric cells demonstrated stable cycling for over 2200 hours at 0.1 mA cm-2.
Full cells with an LFP cathode achieved 88.6% capacity retention after 100 cycles at 1 C.

Conclusions:

The Li3P/Fe interface engineering strategy is highly effective for enhancing the performance and safety of SSLMBs.
This approach offers a scalable solution for developing high-energy-density, long-lifespan solid-state batteries.
The findings provide valuable insights for the industrialization of advanced solid-state battery technologies.