Non-aqueous Electrolyte with Acrylate and Sulfinyl Compounds for SEI Formation

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Solution Overview

Problem

Lithium secondary batteries face degradation during repeated charge/discharge cycles, which worsens with increasing capacity density, necessitating improvements in lifespan and thermal stability.

Innovation Solution

A non-aqueous electrolyte comprising an acrylate compound combined with a sulfinyl group-containing compound, forming a solid electrolyte interface (SEI) layer on the anode to enhance the battery's lifespan and thermal stability, along with an electrode coating layer incorporating reduced forms of these compounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If capacity density of the battery is increased, then energy storage capability is improved, but lifespan and thermal stability deteriorate

Engineering Contradiction:

Improveenergy storage capabilityVSAvoidlifespan and thermal stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent introduces a solid electrolyte interface (SEI) layer as an intermediary between the electrode and the electrolyte. This SEI layer, formed by the acrylate compound and sulfinyl group-containing compound, acts as a protective mediator that prevents direct harmful interactions while allowing ionic transport, thus enabling high capacity density without compromising lifespan and thermal stability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite electrolyte system combining multiple components: acrylate compound, sulfinyl group-containing compound, cyclic carbonate, chain carbonate, and lithium salt. This composite material approach creates synergistic effects where each component contributes specific properties, achieving both high energy storage capability and improved reliability through enhanced thermal stability and lifespan

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If conventional electrolyte additives are used, then gas generation is reduced, but lifespan improvement is insufficient

Engineering Contradiction:

Improvegas generationVSAvoidlifespan

Core Design Contradiction:

Object-generated harmful factorsVSDuration of action of moving object

Solution Approach 1:

The patent merges two previously separate functions into a single integrated system: the acrylate compound forms the SEI layer structure while the sulfinyl group-containing compound simultaneously provides thermal stability and prevents electrolyte decomposition. This combination achieves both gas generation reduction and significant lifespan improvement that neither additive could achieve alone

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent optimizes the concentration parameters of the additives: acrylate compound at 0.01-5 wt% and sulfinyl group-containing compound at 0.01-5 wt%. By precisely controlling these parameter ranges, the SEI layer forms with optimal properties that simultaneously minimize gas generation and maximize lifespan, achieving both objectives without trade-offs

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 combination of acrylate and sulfinyl group-containing compounds in the electrolyte and electrode coating layer improves the battery's lifespan and thermal stability by forming a firm SEI layer, maintaining capacity and reducing gas generation and impedance.

Implementation Method 1

it is reduced at the anode of the battery in advance of the main solvent, such as ethylene carbonate, to form a solid electrolyte interface (SEI) layer with excellent quality

Methodology Applied

Scientific EffectReduction: Reduction

Data Source

PatentUS9466856B2Non-aqueous electrolyte and electrochemical device comprising the same

Publication Date: 2016.10.11 LG ENERGY SOLUTION LTD

AI summary

Disclosed is a non-aqueous electrolyte comprising: an acrylate compound; a sulfinyl group-containing compound; an organic solvent; and an electrolyte salt. Also, disclosed is an electrode comprising a coating layer formed partially or totally on a surface thereof, the coating layer comprising: (i) a reduced form of an acrylate compound; and (ii) a reduced form of a sulfinyl group-containing compound. Further, disclosed is an electrochemical device comprising a cathode, an anode and a non-aqueous electrolyte, wherein (i) the non-aqueous electrolyte is the aforementioned non-aqueous electrolyte; and/or (ii) the cathode and/or the anode is the aforementioned electrode.