LiBOB Electrolyte Composition for High-Temperature Lithium Batteries

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Solution Overview

Problem

Rechargeable lithium batteries face challenges in achieving high energy density and capacity while maintaining high-temperature stability and stability under oxidative conditions.

Innovation Solution

An electrolyte for rechargeable lithium batteries comprising a non-aqueous organic solvent, lithium bis(oxalato)borate (LiBOB), a first compound represented by Chemical Formula 1, and a second compound represented by Chemical Formula 2, which form protective films on electrodes to prevent oxidative decomposition and enhance lithium ion intercalation/deintercalation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional electrolytes are used to achieve high energy density and capacity, then battery performance is improved, but high-temperature stability deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidhigh-temperature stability

Core Design Contradiction:

Use of energy by moving objectVSTemperature

Solution Approach 1:

The patent modifies the chemical composition parameters of the electrolyte by introducing specific compounds (cyclic carboxylate and chain carboxylate) with controlled ratios, where the cyclic carboxylate content is 1-20 wt% and chain carboxylate content is 1-20 wt% based on total electrolyte weight. This parameter optimization resolves the contradiction by achieving both high energy density and improved high-temperature stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system combining multiple components: non-aqueous carbonate solvent, lithium salt, cyclic carboxylate compound, and chain carboxylate compound. This composite approach allows the electrolyte to simultaneously provide high energy density characteristics while maintaining high-temperature stability through synergistic interactions between components.

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If conventional electrolytes are used to achieve high capacity, then battery performance is improved, but stability under oxidative conditions deteriorates

Engineering Contradiction:

ImprovecapacityVSAvoidoxidative stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The cyclic carboxylate and chain carboxylate compounds act as intermediary substances that form protective films on the positive electrode surface. These intermediary compounds prevent direct contact between the conventional electrolyte and the electrode, thereby blocking oxidative decomposition while maintaining lithium ion transport for high capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes the concentration parameters of carboxylate compounds in the electrolyte system. By controlling cyclic carboxylate at 1-20 wt% and chain carboxylate at 1-20 wt%, the electrolyte achieves sufficient protective film formation for oxidative stability while preserving high capacity characteristics.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If electrolyte additives are introduced to improve stability, then high-temperature stability is improved, but gas generation increases

Engineering Contradiction:

Improvehigh-temperature stabilityVSAvoidgas generation

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The patent precisely controls the ratio and concentration parameters of cyclic and chain carboxylate compounds. By optimizing these parameters (each at 1-20 wt% of total electrolyte), the electrolyte forms effective protective films that suppress gas-generating side reactions while maintaining high-temperature stability, thereby reducing overall gas generation.

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 electrolyte improves charge-discharge characteristics, suppresses gas generation, and enhances the lifetime and output characteristics of rechargeable lithium batteries by forming protective films on electrodes, thereby maintaining stability and efficiency.

Implementation Method 1

which form protective films on electrodes to prevent oxidative decomposition and enhance lithium ion intercalation/deintercalation

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Implementation Method 2

prevent oxidative decomposition

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

The positive and negative electrodes each include an active material capable of intercalation and deintercalation of lithium ions

Methodology Applied

Scientific EffectIntercalation: Absorption (physical)

Implementation Method 4

electrical energy is generated due to oxidation and reduction reactions when lithium ions are intercalated and deintercalated

Methodology Applied

Scientific EffectOxidation and reduction reactions: Redox Reactions

Data Source

PatentUS20250323318A1Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

Publication Date: 2025.10.16 SAMSUNG SDI CO LTD

AI summary

An electrolyte and a rechargeable lithium battery includes the electrolyte are provided. The electrolyte includes a non-aqueous organic solvent; a lithium salt; lithium bis(oxalato)borate (LiBOB); a first compound represented by Chemical Formula 1; and a second compound represented by Chemical Formula 2.