Hydrated Lithium Tetraborate Solid Electrolyte for Higher Ionic Conductivity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current lithium-ion secondary batteries face challenges with the flammability and limited compactness of liquid electrolytes, and the need for improved ionic conductivity in all-solid state batteries to enhance charging and discharging characteristics.

Innovation Solution

A lithium-based solid electrolyte comprising lithium tetraborate in a noncrystalline state, water, and a lithium salt, with specific molar ratios and additional elements, which forms a soft hydrated layer for enhanced ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If liquid electrolyte is used in lithium ion secondary battery, then high ion conductivity is achieved, but flammability and safety problems occur

Engineering Contradiction:

ImprovesafetyVSAvoidflammability

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the physical state parameter of the electrolyte from liquid to solid by using lithium tetraborate glass ceramic, fundamentally eliminating flammability while maintaining ion conductivity through controlled composition and structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte system combining lithium tetraborate glass ceramic with specific lithium salts (LiFSO3, LiClO4, LiBF4) to achieve both safety and high ion conductivity that neither component could achieve alone

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If lithium tetraborate is used as solid electrolyte, then safety is improved, but ion conductivity needs further enhancement

Engineering Contradiction:

Improveflammability reductionVSAvoidionic conductivity

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent combines lithium tetraborate glass ceramic with lithium salts (LiFSO3, LiClO4, LiBF4) and controlled water content to create a composite material that maintains the safety benefits of lithium tetraborate while achieving enhanced ion conductivity through the synergistic effects of the components

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the composition parameters of lithium tetraborate by controlling the Li2O/B2O3 ratio, adding specific amounts of water (0.1-5.0 wt%), and incorporating lithium salts to transform it from a low-conductivity material to a high-performance solid electrolyte

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 solution provides a lithium-based solid electrolyte with improved ionic conductivity, addressing safety and compactness issues while enabling better performance in all-solid state secondary batteries.

Implementation Method 1

lithium tetraborate in a noncrystalline state; water; and a lithium salt

Methodology Applied

Scientific EffectHydration: Hydrates

Data Source

PatentUS20230343997A1Lithium-based solid electrolyte, inorganic solid electrolyte, production method for lithium-based solid electrolyte, modified positive electrode active material, modified negative electrode active material, all-solid state secondary battery, electrode sheet for all-solid state secondary battery, solid electrolyte sheet, and electrode for all-solid state secondary battery

Publication Date: 2023.10.26 INSTITUTE OF SCIENCE TOKYO

AI summary

The present invention provides a lithium-based solid electrolyte excellent in ion conductivity, an inorganic solid electrolyte, a production method for a lithium-based solid electrolyte, a modified positive electrode active material, a modified negative electrode active material, an all-solid state secondary battery, an electrode sheet for an all-solid state secondary battery, a solid electrolyte sheet, and an electrode for an all-solid state secondary battery. The lithium-based solid electrolyte according to the present invention contains lithium tetraborate in a noncrystalline state, water, and a lithium salt.