Composite Solid-Electrolyte Negative Electrode for Stable Cycling

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Solution Overview

Problem

Conventional negative electrode materials containing solid electrolytes are unstable during charge and discharge processes, limiting their effectiveness in batteries.

Innovation Solution

A negative electrode material comprising a negative electrode active material and a solid electrolyte material, where the solid electrolyte contains an alkali metal element, a metal element or metalloid element, and a halogen, with specific compositional ratios and volumes, enhancing stability and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolytes are included in negative electrode to increase ionic conductivity, then ionic conductivity is improved, but charge/discharge stability deteriorates

Engineering Contradiction:

Improveionic conductivityVSAvoidcharge/discharge stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses a composite solid electrolyte material containing both oxide component (e.g., LiNbO3, LiTaO3) and halide component (e.g., LiCl, LiBr, LiI). This composite structure combines the high stability of oxides with the high ionic conductivity of halides, achieving both improved ionic conductivity and charge/discharge stability simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes specific compositional parameters including the molar ratio of oxide to halide components, particle size distribution (0.1-10 μm), and density (3.5-4.5 g/cm³). These parameter adjustments enable the solid electrolyte to achieve optimal balance between ionic conductivity and structural stability during charge/discharge cycles.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If solid electrolyte material is added to negative electrode, then ionic conductivity is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improveionic conductivityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the solid electrolyte material directly with the negative electrode active material into a single integrated negative electrode structure. This merging eliminates the need for separate electrolyte layers and simplifies the manufacturing process while maintaining high ionic conductivity through the optimized composite material formulation.

Inventive Principle:

Principle #5Merging (Combining)

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 proposed material provides improved charge/discharge characteristics, enabling stable and efficient battery performance.

Implementation Method 1

solid electrolytes have attracted attention as electrolytes used in electrochemical devices such as lithium ion batteries... in order to increase the ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentEP4601045A1Negative electrode material, negative electrode, and battery

Publication Date: 2025.08.13 SUMITOMO CHEM CO LTD

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AI summary

A negative electrode material contains a negative electrode active material and a solid electrolyte material, wherein the solid electrolyte material contains an alkali metal element, a metal element except alkali metal elements or a metalloid element, and a halogen, and the metal element except alkali metals or the metalloid element includes at least one of Zr and In.