Battery Electrolyte Additives for High-Temperature Gas Suppression
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Solution Overview
Problem
Conventional electrolyte solutions for lithium-ion secondary batteries face issues such as reduced capacity retention, easy dissolution of metal from the positive electrode, and significant gas generation when stored at high temperatures.
Innovation Solution
An electrolyte solution containing at least one compound (I) represented by a specific formula and at least one compound (II) selected from a group of specific compounds, along with a solvent that may include non-fluorinated or fluorinated cyclic carbonates and acyclic esters, is used to enhance the stability and performance of lithium-ion secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in lithium-ion secondary batteries, then the batteries can operate, but the capacity retention is reduced and metal dissolution occurs when stored at high temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing specific compounds (formula I and formula II) with controlled concentrations (0.01-5 wt% and 0.1-5 wt% respectively). These compositional changes enable the electrolyte to maintain stability at high temperatures while preserving capacity retention, directly resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining multiple components: the base electrolyte, compound (I) with specific molecular structure, and compound (II) selected from multiple chemical families. This composite approach synergistically improves both capacity retention and high-temperature stability, overcoming the limitations of conventional single-component electrolytes.
2Reliability
If conventional electrolyte solutions are used, then the batteries can function, but gas generation increases significantly when stored at high temperatures
Solution Approach 1:
The patent adjusts the chemical parameters of the electrolyte composition by incorporating compound (I) and compound (II) at optimized concentrations. This parameter modification suppresses parasitic reactions that generate gas during high-temperature storage, while maintaining normal battery functionality, thus resolving the contradiction between reliability and harmful factor reduction.
3Reliability
If conventional electrolyte solutions are used, then the batteries can operate, but metal dissolution from the positive electrode occurs at high temperatures
Solution Approach 1:
The patent introduces compound (I) and compound (II) as intermediary substances that form protective interfaces between the electrolyte and the positive electrode. These intermediary compounds prevent direct contact and chemical reactions between the electrolyte and electrode materials, thereby reducing metal dissolution while maintaining battery operation, effectively resolving the contradiction between reliability and substance loss.
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 proposed electrolyte solution maintains high capacity retention, reduces metal dissolution from the positive electrode, and minimizes gas generation even after the battery is stored at high temperatures, thereby improving the overall performance and longevity of lithium-ion secondary batteries.
Implementation Method 1
the positive electrode includes an electrode compound which absorbs and releases an electrode reactant at a potential of 4.5 V or higher (potential versus lithium)
Implementation Method 2
a non-aqueous electrolyte solution including a silyl compound
Data Source
AI summary
The invention provides an electrolyte solution that can have a high capacity retention, can reduce dissolution of metal from a positive electrode, and can cause less generation of gas even after an electrochemical device such as a lithium ion secondary battery is stored at high temperature. The electrolyte solution contains at least one selected from the group consisting of a compound (I) represented by the following formula (I) and specific compounds (II). The formula (I) is as follows: wherein R11 is a C2-C6 alkyl group.