Non-Aqueous Electrolyte Additives for Dense Li-Ion Electrode Infiltration

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Solution Overview

Problem

Highly compacted density in lithium-ion secondary battery electrodes reduces porosity, making it difficult for electrolytes to infiltrate, leading to increased polarization and impedance, and can cause damage to positive and negative electrode particles, resulting in shortened cycle life.

Innovation Solution

Incorporating a cyclic sulfonate additive and a phosphate or isocyanate additive into the non-aqueous electrolyte to form a more robust solid electrolyte interface (SEI) film, enhancing conductivity and mechanical strength, thereby reducing impedance and protecting the electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If higher compacted density is used in electrode plates to increase energy density, then battery range is improved, but porosity is greatly reduced making electrolyte infiltration difficult and polarization increases

Engineering Contradiction:

Improveenergy densityVSAvoidcycle life

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent introduces a cyclic carboxylate additive (0.01-5 wt%) into the non-aqueous electrolyte that changes the chemical composition parameters of the SEI film, transforming it from a weak protective layer to a robust film with enhanced conductivity and mechanical strength, thereby resolving the contradiction between high compacted density and cycle life

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The cyclic carboxylate additive acts as an intermediary substance that mediates between the electrode and electrolyte interface, forming a protective SEI film that prevents direct contact and harmful reactions, thus protecting the electrode structure under high compacted density conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If higher compacted density is used in electrode plates, then energy density is improved, but electrode particles are damaged causing transition metal dissolution and violent reactions

Engineering Contradiction:

Improveenergy densityVSAvoidelectrode particle damage

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The cyclic carboxylate additive performs beforehand cushioning by forming a protective SEI film on the electrode surface before damage can occur, cushioning the electrode particles from high-pressure extrusion damage and preventing transition metal dissolution during battery cycling

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent converts the harmful effect of high compacted density (which causes particle damage) into a benefit by using the cyclic carboxylate additive to create a protective interface layer, turning the potentially damaging high-pressure environment into a condition that enhances battery performance when protected by the robust SEI film

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If robust SEI film is formed using cyclic sulfonate and phosphate/isocyanate additives, then impedance is reduced and electrode protection is improved, but electrolyte composition complexity increases

Engineering Contradiction:

Improvecycle and storage lifeVSAvoidelectrolyte composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cyclic carboxylate additive performs multiple functions simultaneously: it forms the protective SEI film, reduces impedance, prevents particle damage, and improves both cycle life and storage stability. This multi-functionality reduces the need for multiple different additives, thereby simplifying the overall electrolyte composition while achieving comprehensive protection

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 SEI film improves the cycle and storage life of the battery by reducing impedance and protecting the electrodes, especially at high temperatures.

Implementation Method 1

Incorporating a cyclic sulfonate additive and a phosphate or isocyanate additive into the non-aqueous electrolyte to form a more robust solid electrolyte interface (SEI) film

Methodology Applied

Scientific EffectSolid electrolyte interface (SEI) film formation:

Data Source

PatentEP4715936A1Non-aqueous electrolyte, secondary battery, and electrical apparatus

Publication Date: 2026.03.25 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

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AI summary

The present application relates to the technical field of batteries, and to a non-aqueous electrolyte, a secondary battery and an electrical apparatus. The non-aqueous electrolyte comprises a cyclic sulfate additive and a phosphate or isocyanate additive. The present application further relates to a secondary battery comprising the non-aqueous electrolyte, and an electrical apparatus comprising the secondary battery.