Gel Electrolyte Precursor Composition for Battery Safety

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Solution Overview

Problem

Lithium-ion secondary batteries face safety issues due to non-aqueous electrolyte leakage and explosion risks, and conventional gel electrolytes have high viscosity and low conductivity, making them unsuitable for vacuum filling and effective battery fabrication.

Innovation Solution

A precursor composition for gel electrolytes is developed, comprising a meta-stable nitrogen-containing polymer formed by reacting a nitrogen-containing heterocyclic compound with a maleimide compound, along with a gelling promoter, carbonate compound, and metal salt, which undergoes a gelling reaction to create a gel electrolyte with improved viscosity and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional gel electrolyte is used, then safety is improved, but viscosity becomes too high for vacuum filling

Engineering Contradiction:
ImprovesafetyVSAvoidvacuum filling
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by introducing a gelling promoter that enables the electrolyte to transition from liquid to gel state after vacuum filling. The liquid precursor composition is filled into the battery first, then converted to gel form in situ, avoiding the need to handle high-viscosity gel during the filling process while still achieving the safety benefits of gel electrolyte.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If conventional gel electrolyte is used, then safety is improved, but conductivity becomes too low

Engineering Contradiction:
ImprovesafetyVSAvoidconductivity
Core Design Contradiction:
ReliabilityVSPower

Solution Approach 1:

The patent applies parameter changes by carefully controlling the composition ratios of carbonate compounds (cyclic and chain types), gelling promoter concentration, and metal salt content. By adjusting these parameters, the electrolyte achieves optimal balance between gel structure formation (for safety) and ionic conductivity (for power), resulting in conductivity of at least 10 mS/cm while maintaining gel state.

Inventive Principle:
Principle #35Parameter changes

3Use of energy by moving object

If non-aqueous electrolyte solution is used, then energy capacity is improved, but safety deteriorates due to leakage and explosion

Engineering Contradiction:
Improveenergy capacityVSAvoidsafety
Core Design Contradiction:
Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies phase transitions by utilizing the transition from liquid to gel state. The electrolyte is introduced as a liquid precursor for easy filling, then undergoes phase transition to gel form to provide safety benefits. This phase change enables the system to maintain the high energy capacity of non-aqueous electrolytes while eliminating leakage and explosion risks through gel structure formation.

Inventive Principle:
Principle #36Phase transitions

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 gel electrolyte achieves a viscosity of greater than or equal to 200 cp and conductivity of greater than or equal to 10 mS/cm, enhancing the safety and electrical properties of lithium-ion batteries while allowing for safe and efficient battery fabrication.

Implementation Method 1

meta-stable nitrogen-containing polymer, formed by reacting (a) nitrogen-containing heterocyclic compound with (b) maleimide compound

Methodology Applied
Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 2

a product of a gelling reaction of (1) meta-stable nitrogen-containing polymer, (2) gelling promoter, and (3) carbonate compound

Methodology Applied
Scientific EffectGel formation: Gel

Data Source

PatentUS10553900B2Gel electrolyte and precursor composition thereof and battery
Publication Date: 2020.02.04 IND TECH RES INST
  • US10553900B2 patent drawing
  • US10553900B2 patent drawing
  • US10553900B2 patent drawing

AI summary

A precursor composition of a gel electrolyte is provided, which includes (1) meta-stable nitrogen-containing polymer, (2) gelling promoter, (3) carbonate compound, and (4) metal salt. The (1) meta-stable nitrogen-containing polymer is formed by reacting (a) nitrogen-containing heterocyclic compound with (b) maleimide compound, wherein (a) nitrogen-containing heterocyclic compound and (b) maleimide compound have a molar ratio of 1:0.1 to 1:10.