Lithium-Ion Battery Electrolyte Composition for High-Temperature Output
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Solution Overview
Problem
Current electrolyte solutions for lithium-ion secondary batteries do not adequately improve output characteristics at initial stages and high-temperature storage, nor do they enhance high-temperature cycle characteristics, which are crucial for applications in vehicles that require efficient energy storage across varying temperatures.
Innovation Solution
An electrolyte solution containing a compound represented by formula (1) and at least one compound selected from formulas (11-1) to (11-4), which includes specific phosphorus-based compounds and their derivatives, is used to improve the electrochemical device's performance by optimizing the electrolyte's composition and concentration for better initial output and high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electrolyte solutions are used, then the basic battery function is maintained, but the output characteristics at initial stage and after high-temperature storage are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the electrolyte solution. Specifically, it introduces a compound with formula (1) containing phosphorus atoms bonded to oxygen, with specific ratios of P=O to P-O-C bonds (0.05-5.0 mol%), and combines it with compounds of formulas (11-1) to (11-4). This chemical parameter modification enables simultaneous improvement of initial output characteristics and high-temperature storage stability without compromising basic battery function.
Solution Approach 2:
The patent employs composite materials by creating a multi-component electrolyte system. It combines the phosphorus-containing compound (formula 1) with specific additives (formulas 11-1 to 11-4) in defined proportions. This composite electrolyte composition works synergistically to enhance both power output and thermal stability, resolving the contradiction between initial performance and long-term reliability.
2Power
If electrolyte composition is optimized for initial output, then output characteristics improve, but high-temperature cycle characteristics are not adequately enhanced
Solution Approach 1:
The patent modifies the electrolyte composition parameters by incorporating compound (1) at specific concentrations (0.001-10% by mass) combined with compounds (11-1) to (11-4) at defined ratios. This parameter optimization simultaneously addresses initial output power and high-temperature cycle life, achieving both goals without trade-offs.
Solution Approach 2:
The phosphorus-containing compound (1) serves multiple functions: it enhances initial output characteristics, improves high-temperature storage stability, and extends cycle life. By making this single compound multi-functional, the patent resolves the contradiction between optimizing for initial performance versus long-term durability.
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 significantly enhances the output characteristics and high-temperature cycle performance of lithium-ion secondary batteries, ensuring efficient energy storage and retention even at extreme temperatures, thereby meeting the demands of automotive applications.
Implementation Method 1
electrolyte solution including a compound (1) represented by the following formula (1) and at least one compound (11) selected from the group consisting of compounds represented by the following formulas (11-1) to (11-4)... improve the output characteristics of an electrochemical device at initial stage and after high-temperature storage as well as the high-temperature cycle characteristics of the device
Data Source
AI summary
An electrolyte solution containing a compound represented by formula (1) and a compound represented, for example, by formula (11-1), the formula (1) being:wherein M101 is P or P═O; R101 is a group such as a C1-C11 alkylsilyloxy group; n101 is an oxidation number of M101 minus 1 or an oxidation number of M101 minus 3; and R102 to R104 are each individually a group such as a C1-C11 alkyl group; the formula (11-1) being:wherein R111 and R112 are the same as or different from each other and are each an atom or group such as a hydrogen atom; and R113 is a group such as an alkyl group free from a fluorine atom.