Divalent Imide Salt Electrolyte for Battery Temperature Contradiction
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Solution Overview
Problem
Non-aqueous electrolyte batteries lack satisfactory low-temperature and high-temperature cycle characteristics, with existing solutions either improving high-temperature performance at the expense of low-temperature performance or increasing internal resistance.
Innovation Solution
Incorporating a specific salt with a divalent imide anion into the non-aqueous electrolytic solution, which forms a film that inhibits decomposition and enhances lithium conductivity, thereby improving both low-temperature output and high-temperature cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinylene carbonate is added to suppress electrolytic solution decomposition, then high-temperature characteristic is improved, but internal resistance significantly increases and low-temperature characteristic deteriorates
Solution Approach 1:
The patent combines multiple additives (vinylene carbonate at 0.01-5 wt%, fluoroethylene carbonate at 0.01-5 wt%, and imide salt at 0.01-5 wt%) to create a synergistic effect that simultaneously improves high-temperature stability and maintains low-temperature performance, resolving the contradiction between these two opposing requirements
Solution Approach 2:
The patent optimizes the concentration parameters of each additive component to achieve the desired balance. By precisely controlling the amounts of vinylene carbonate, fluoroethylene carbonate, and imide salt within specific ranges, the electrolytic solution achieves both high-temperature resistance and acceptable low-temperature conductivity
2Ease of manufacture
If existing electrolytic solution formulations are used, then manufacturing simplicity is maintained, but both low-temperature output characteristic and high-temperature cycle characteristic remain insufficient
Solution Approach 1:
The patent creates a composite electrolytic solution system combining traditional carbonate solvents with specific additives (vinylene carbonate, fluoroethylene carbonate, and imide salt). This composite formulation achieves superior low-temperature output and high-temperature cycle characteristics while maintaining practical manufacturability through straightforward mixing processes
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 use of a salt with a divalent imide anion in the non-aqueous electrolytic solution significantly improves the battery's low-temperature output characteristic at -30°C or lower and high-temperature cycle characteristic at 45°C or higher, maintaining performance across a wide temperature range.
Implementation Method 1
it is considered that a salt having an imide anion of the present invention is partially decomposed at the boundary between a positive electrode and an electrolytic solution, and the boundary between a negative electrode and the electrolytic solution, so as to form a film
Implementation Method 2
a salt having an imide anion of the present invention is partially decomposed at the boundary between a positive electrode and an electrolytic solution
Implementation Method 3
enhances lithium conductivity
Data Source
AI summary
An electrolytic solution for a non-aqueous electrolyte battery is provided, which is capable of providing an excellent low-temperature output characteristic at -30°C or lower and an excellent cycle characteristic at high temperatures of 45°C or higher. For example, the electrolytic solution contains the following salt having a divalent imide anion. wherein R1 to R3 represent a fluorine atom or an alkoxy group, for example, and M1 and M2 represent protons or metal cations, for example.