Non-Aqueous Electrolyte Additive for Wide-Temperature Battery Output
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Solution Overview
Problem
Non-aqueous electrolyte solution batteries face challenges in achieving a balance between high-temperature cycle properties and low-temperature output performance, with existing additives either improving one aspect at the expense of the other or showing low effects across both temperature ranges.
Innovation Solution
Incorporating a specific ionic compound with a particular structure into the non-aqueous electrolyte solution, which forms a film that inhibits decomposition and enhances conductivity, thereby improving both high-temperature cycle and low-temperature output properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinylene carbonate is added to improve cycle properties at high temperature, then high-temperature cycle properties are improved, but internal resistance significantly increases and low-temperature properties decrease
Solution Approach 1:
The patent combines multiple additives (vinylene carbonate at 0.01-5 mass%, fluoroethylene carbonate at 0.01-5 mass%, and the specific ionic compound at 0.01-5 mass%) to create a synergistic effect that simultaneously improves high-temperature cycle properties and low-temperature output properties, resolving the contradiction between these two performance aspects
Solution Approach 2:
The patent optimizes the concentration parameters of each additive component to achieve balanced performance. By carefully controlling the content of vinylene carbonate, fluoroethylene carbonate, and the ionic compound within specific ranges, the electrolyte achieves both low internal resistance for low-temperature operation and stable film formation for high-temperature durability
2Reliability
If ionic compound is used as supporting electrolyte to improve cycle properties at high temperature, then high-temperature cycle properties are improved, but low-temperature properties show low improvement effect
Solution Approach 1:
The patent merges the ionic compound with conventional additives (vinylene carbonate and fluoroethylene carbonate) to create a multi-component electrolyte system where each component contributes different functions: the ionic compound provides high-temperature stability while the carbonate additives ensure low-temperature conductivity, achieving both performance targets simultaneously
3Duration of action of stationary object
If electrolyte solution is optimized for high-temperature durability, then high-temperature cycle properties are improved, but low-temperature output properties decrease
Solution Approach 1:
The patent creates a composite electrolyte system combining multiple chemical components (cyclic carbonates, chain carbonates, ionic compound, and additives) that work synergistically. This composite approach allows the electrolyte to exhibit both high-temperature stability through film-forming components and low-temperature conductivity through components with low viscosity and high ionic mobility
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 ionic compound enables non-aqueous electrolyte solution batteries to exhibit well-balanced high-temperature cycle and low-temperature output performance, with improved discharge capacity retention and high-output capacity retention rates across a wide temperature range.
Implementation Method 1
incorporating a specific ionic compound with a particular structure into the non-aqueous electrolyte solution, which forms a film that inhibits decomposition
Implementation Method 2
a method for improving the conductivity of cations (reducing resistance) by using the specific ionic compound as a supporting electrolyte
Data Source
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AI summary
Provided is an additive for a non-aqueous electrolyte solution that can exhibit high-temperature cycle properties at 50°C or more and low-temperature output properties at -20°C or less in a well-balanced manner for a non-aqueous electrolyte solution battery. The additive for a non-aqueous electrolyte solution is represented by formula [1]: in formula [1], Z1 to Z4 are each a fluorine atom or are selected from alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyloxy groups having 2 to 10 carbon atoms, cycloalkyl groups having 3 to 10 carbon atoms, cycloalkoxy groups having 3 to 10 carbon atoms, cycloalkenyl groups having 3 to 10 carbon atoms, cycloalkenyloxy groups having 3 to 10 carbon atoms, aryl groups having 6 to 10 carbon atoms, and aryloxy groups having 6 to 10 carbon atoms. These organic groups may contain a fluorine atom, an oxygen atom, or an unsaturated bond, and at least one of Z1 to Z4 is a fluorine atom. Mp+ is a proton, a metal cation, or an onium cation, and p is a cation valence.