Coated LATP Electrolyte for Higher Ionic Conductivity Retention

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing Lithium Aluminum Titanium Phosphate (LATP) materials suffer from low ionic conductivity and low capacity retention rate, which affects the performance of all-solid-state lithium-ion batteries.

Innovation Solution

A modified Lithium Aluminum Titanium Phosphate is developed, comprising a Lithium Aluminum Titanium Phosphate matrix represented by Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 with a coating layer of Zr x Si 1-x O 2 /TiO 2, where x is 0.1-0.9, and specific particle sizes and ratios are optimized to enhance ionic conductivity and thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LATP material is prepared by conventional methods (sol-gel, molten salt quenching, water cooling, or high-temperature solid-state method), then the material can be synthesized, but the ionic conductivity remains low (below 10^-4 S/cm)

Engineering Contradiction:

Improveionic conductivityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies composite materials by combining LATP with a coating layer formed from ZrxSi1-xO2/TiO2. This composite structure enhances the ionic conductivity of the base LATP material while maintaining structural integrity. The coating layer works synergistically with the LATP matrix to improve overall performance without requiring complete redesign of the synthesis process.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs parameter changes by optimizing the particle size of the coating layer to be smaller than that of the LATP matrix, and by adjusting the compositional parameter x in ZrxSi1-xO2/TiO2 (where x ranges from 0.1 to 0.9). These parameter optimizations enhance ionic conductivity while controlling manufacturing complexity through systematic variation of key parameters.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If LATP material is used in lithium-ion solid-state batteries, then the battery can operate, but the capacity retention rate is low

Engineering Contradiction:

Improvecapacity retention rateVSAvoidcycle life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies local quality by creating a coating layer with specific properties (smaller particle size, controlled composition) on the surface of the LATP material. This localized modification improves the interface properties and reduces capacity loss during cycling, thereby enhancing both capacity retention rate and cycle life without altering the bulk properties of the LATP material.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements beforehand cushioning by pre-coating the LATP particles with ZrxSi1-xO2/TiO2 before battery assembly. This protective coating layer is applied in advance to prevent capacity loss and structural degradation during subsequent cycling operations, cushioning against the harmful effects of repeated charge-discharge cycles.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the particle size of coating layer is larger than or equal to LATP matrix, then coating is easier, but the tightness of crystal arrangement and ion migration rate are reduced

Engineering Contradiction:

Improveion migration rateVSAvoidcoating uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by optimizing the particle size parameter of the coating layer to be smaller than that of the LATP matrix. This parameter adjustment ensures better coating uniformity and tighter crystal arrangement, which in turn improves ion migration rate. The compositional parameter x in ZrxSi1-xO2/TiO2 is also optimized to achieve the desired balance between coating quality and ionic conductivity.

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 modified LATP material exhibits improved ionic conductivity and capacity retention rate, along with enhanced thermal stability, making it suitable for high-performance lithium-ion solid-state batteries.

Implementation Method 1

physical coating is performed on the Lithium Aluminum Titanium Phosphate matrix and Zr x Si 1-x O 2 /TiO 2

Methodology Applied

Scientific EffectPhysical coating: Deposition (physical)

Implementation Method 2

a ceramic body sintered from LATP powder

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentEP4693559A1Modified lithium aluminum titanium phosphate, preparation method therefor, and lithium-ion solid-state battery

Publication Date: 2026.02.11 HEFEI GUOXUAN HIGH TECH POWER ENERGY

Figure 1~2
Figure 3

AI summary

Provided are modified Lithium Aluminum Titanium Phosphate and preparation method thereof, and lithium-ion solid-state battery. The modified Lithium Aluminum Titanium Phosphate includes a Lithium Aluminum Titanium Phosphate matrix and a coating layer. The Lithium Aluminum Titanium Phosphate matrix is represented by Li1.3Al0.3Ti1.7(PO4)3, and the coating layer is formed by ZrxSi1-xO2/TiO2, where x is 0.1-0.9, and a particle size of the ZrxSi1-xO2/TiO2 is less than a particle size of the Li1.3Al0.3Ti1.7(PO4)3. A modified LATP material having the above compositions simultaneously has the advantages of being high in ionic conductivity and capacity retention rate, good in thermal stability, etc.