Methylphosphonoyloxymethane Electrolyte for High-Temperature Battery Stability

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Solution Overview

Problem

Secondary lithium batteries face rapid degradation and increased internal resistance at elevated temperatures, leading to accelerated capacity fading and poor electrochemical performance, which existing electrolyte compositions fail to adequately address.

Innovation Solution

An electrolyte composition comprising at least one aprotic organic solvent, a conducting salt, and methylphosphonoyloxymethane, optionally with additional additives, which enhances cycling performance, storage stability, and reduces internal resistance, especially at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional electrolyte compositions are used, then the battery can operate at elevated temperatures, but rapid degradation and increased internal resistance occur

Engineering Contradiction:

Improveoperating temperatureVSAvoidelectrochemical performance stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent introduces methylphosphonoyloxymethane as a novel electrolyte additive that modifies the chemical composition parameters of the electrolyte system. This additive changes the decomposition behavior and film-forming characteristics at elevated temperatures, enabling stable operation up to 60°C while preventing rapid degradation and internal resistance increase that plague conventional electrolyte compositions.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If existing electrolyte compositions are used, then the battery can function at high temperatures, but capacity fading accelerates rapidly

Engineering Contradiction:

Improveoperating temperatureVSAvoidcycle life

Core Design Contradiction:

TemperatureVSDuration of action of moving object

Solution Approach 1:

The methylphosphonoxymethane additive performs preliminary protective action by forming stable decomposition products and protective films on electrode surfaces before significant degradation can occur. This preliminary film formation prevents subsequent capacity fading and maintains cycle life even when the battery operates at elevated temperatures, addressing the fundamental limitation of conventional electrolytes.

Inventive Principle:

Principle #10Preliminary action

3Temperature

If conventional electrolyte compositions are used, then the battery can operate, but internal resistance increases significantly at elevated temperatures

Engineering Contradiction:

Improveoperating temperatureVSAvoidinternal resistance increase

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potentially harmful thermal degradation reactions into beneficial protective film formation. The methylphosphonoxymethane additive undergoes controlled decomposition at elevated temperatures to form stable protective layers that actually reduce further degradation and prevent the harmful increase in internal resistance, turning thermal stress into a protective mechanism.

Inventive Principle:

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

Data Source

PatentUS10581112B2Methylphosphonoyloxymethane as electrolyte component

Publication Date: 2020.03.03 GOTION INC

AI summary

An electrolyte composition and an electrochemical cell that includes the electrolyte composition are included. The electrolyte composition includes: at least one aprotic organic solvent; at least one conducting salt; methylphosphonoyloxymethane; and optionally one or more additives. The use of methylphosphonoyloxymethane in an electrolyte composition for electrochemical cells is also included.