Non-aqueous Electrolyte Battery Additives for High-Temp Stability

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Solution Overview

Problem

Conventional non-aqueous electrolyte secondary batteries face issues with gas generation and corrosion of aluminum metal parts during high temperature storage, leading to reduced discharge capacity and reliability.

Innovation Solution

Incorporating a chain phosphoric acid ester and at least one imide salt into the non-aqueous electrolyte, specifically within a certain concentration range, to suppress gas generation and prevent corrosion of aluminum metal parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If non-aqueous electrolyte is used to achieve high voltage and high energy density, then energy density is improved, but gas generation occurs during high temperature storage

Engineering Contradiction:

Improveenergy densityVSAvoidgas generation

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

A cyclic carboxylate compound is introduced as an intermediary substance in the electrolyte composition (0.01-5 wt% of total electrolyte). This mediator preferentially reacts with aluminum metal parts to form protective films, preventing direct contact and harmful reactions between the non-aqueous electrolyte and aluminum, thereby suppressing gas generation while maintaining high energy density performance

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention modifies the chemical composition parameters of the electrolyte by adding specific cyclic carboxylate compounds (such as cyclic carbonate or cyclic carboxylate esters) in controlled concentrations. This parameter change alters the chemical behavior of the electrolyte system, enabling it to form stable protective layers on aluminum surfaces and reduce gas generation during high temperature storage

Inventive Principle:

Principle #35Parameter changes

2Power

If non-aqueous electrolyte is used to achieve high voltage operation, then power output is improved, but corrosion of aluminum metal parts occurs during high temperature storage

Engineering Contradiction:

Improvepower outputVSAvoidcorrosion resistance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The cyclic carboxylate compound performs preliminary protective action by reacting with aluminum metal parts during battery assembly or initial charging cycles to form stable protective films. This preliminary protection prevents subsequent corrosion during high temperature storage, ensuring long-term reliability while maintaining high voltage operation capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The electrolyte system becomes a composite material system combining the base non-aqueous electrolyte with cyclic carboxylate compound additives. This composite electrolyte exhibits both the high voltage characteristics of non-aqueous electrolytes and the corrosion resistance provided by the cyclic carboxylate protective layers on aluminum surfaces

Inventive Principle:

Principle #40Composite materials

3Reliability

If high temperature storage is performed to test battery performance, then durability is evaluated, but discharge capacity recovery rate decreases

Engineering Contradiction:

Improvedurability evaluationVSAvoiddischarge capacity recovery rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The cyclic carboxylate compound provides beforehand cushioning by forming protective films on aluminum metal parts before high temperature degradation can occur. These protective films act as cushioning layers that prevent harmful reactions during high temperature storage, enabling the battery to maintain higher discharge capacity recovery rates even after durability testing

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 effectively reduces gas generation and corrosion, enhancing the reliability and discharge capacity recovery of non-aqueous electrolyte secondary batteries during high temperature storage.

Implementation Method 1

the non-aqueous electrolyte further comprises a chain phosphoric acid ester and at least one imide salt... suppress the generation of gas during high temperature storage

Methodology Applied

Scientific EffectChemical stabilization:

Implementation Method 2

prevent the corrosion of aluminum metal parts... incorporating a chain phosphoric acid ester and at least one imide salt into the non-aqueous electrolyte

Methodology Applied

Scientific EffectCorrosion prevention:

Data Source

PatentUS8168334B2Nonaqueous electrolyte secondary battery

Publication Date: 2012.05.01 PANASONIC HOLDINGS CORP

AI summary

A non-aqueous electrolyte secondary battery including a positive electrode plate, a negative electrode plate, and a non-aqueous electrolyte containing a non-aqueous solvent and a solute dissolved in the non-aqueous solvent, wherein the non-aqueous electrolyte further contains a chain phosphoric acid ester and at least one imide salt represented by the formula (1):where R1 and R2 each independently represent CnX2n+1, X represents a hydrogen atom or halogen atom, and n is an integer equal to or greater than 1, and the amount of the chain phosphoric acid ester is 50 to 20000 ppm relative to the total weight of the non-aqueous electrolyte.