Li2PO3F-Coated Solid-State Electrolyte for Faster Ion Conduction

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Solution Overview

Problem

Conventional liquid-state electrolytes face issues such as volatility and leakage, while solid-state electrolytes have inefficiencies in ion conduction and manufacturing challenges, including poor surface stability and long processing times, affecting battery performance.

Innovation Solution

A composite solid-state electrolyte comprising lithium lanthanum zirconium tantalum oxide nanoparticles coated with Li2PO3F, with a specific weight ratio, forming a covalent bond and dispersed in a fluorine-containing polymer network, enhances ion conductivity and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solid-state electrolytes are used, then safety and stability are improved, but ion conduction efficiency deteriorates

Engineering Contradiction:

Improvesafety and stabilityVSAvoidion conduction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent creates a composite solid-state electrolyte by coating LLZO nanoparticles with Li2PO3F, forming a dual-phase composite structure. The LLZO core provides structural stability and safety, while the Li2PO3F coating layer enhances ion conduction pathways at the grain boundaries, thereby simultaneously improving both reliability and ion conduction efficiency.

Inventive Principle:

Principle #40Composite materials

2Reliability

If solid-state electrolytes are manufactured, then battery performance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvebattery performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent performs preliminary surface modification of LLZO nanoparticles by coating them with Li2PO3F before assembling the battery. This preliminary action addresses surface stability issues and enhances ion conduction in advance, simplifying the overall manufacturing process by eliminating the need for complex post-assembly treatments and ensuring consistent battery performance.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If surface stability is improved, then charging and discharging properties are enhanced, but processing time increases

Engineering Contradiction:

Improvecharging and discharging propertiesVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent optimizes the weight ratio parameter of Li2PO3F coating to 5-10 times that of LLZO, which provides the optimal balance between surface stability improvement and processing efficiency. This parameter optimization ensures sufficient surface passivation for enhanced charging/discharging properties while minimizing excessive processing time associated with thicker coatings.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composite electrolyte achieves high capacitance, fast charging and discharging, and improved cyclic stability, addressing the limitations of conventional electrolytes and enhancing battery performance.

Implementation Method 1

Li2PO3F coating an outer surface of the lithium lanthanum zirconium tantalum oxide nanoparticle

Methodology Applied

Scientific EffectCoating/Deposition: Deposition (physical)

Implementation Method 2

lithium lanthanum zirconium tantalum oxide nanoparticle... enhances ion conductivity

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 3

the lithium lanthanum zirconium tantalum oxide nanoparticle coated with the Li2PO3F is dispersed in a three-dimensional network structure formed by the fluorine-containing polymer

Methodology Applied

Scientific EffectPolymer network formation: Gel

Data Source

PatentUS20260005293A1Composite solid-state electrolyte

Publication Date: 2026.01.01 HON HAI PRECISION INDUSTRY CO LTD

AI summary

The present disclosure provides a composite solid-state electrolyte. The composite solid-state electrolyte includes a lithium lanthanum zirconium tantalum oxide nanoparticle and Li2PO3F. The Li2PO3F coats an outer surface of the lithium lanthanum zirconium tantalum oxide nanoparticle, in which a weight ratio of the Li2PO3F to the lithium lanthanum zirconium tantalum oxide nanoparticle is larger than or equal to 5.