Non-aqueous Electrolyte for Battery Low-Temperature Resistance
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving satisfactory cycle capacity maintaining ratio and low-temperature resistance characteristics, despite efforts to improve their performance for applications in large-size power sources and electronic devices.
Innovation Solution
A non-aqueous electrolytic solution containing a specific compound represented by the formula (1), which includes an organic group with a heteroatom, a sulfur, phosphorus, or carbon atom, and an alkylene group, is used to enhance the thermal stability of the negative electrode film, thereby improving the battery's cycle capacity and low-temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electrolytic solutions are used, then basic battery function is maintained, but low-temperature resistance characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the electrolytic solution by incorporating compound (1) with specific molecular structure features including heteroatoms, sulfur/phosphorus/carbon atoms, and alkylene groups. These parameter changes enhance the solution's adaptability to low-temperature environments while maintaining reliable battery performance in cold conditions.
2Reliability
If arbitrary compounds are added to improve characteristics, then some performance aspects improve, but thermal stability of negative electrode film deteriorates
Solution Approach 1:
The patent applies local quality by designing compound (1) with specific functional regions: heteroatom-bearing organic groups for electrode interaction, sulfur/phosphorus/carbon atoms for thermal stability, and alkylene chains for low-temperature flexibility. This localized functional distribution enables simultaneous improvement of cycle capacity, low-temperature resistance, and thermal stability without compromising any single property.
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 the compound in the non-aqueous electrolytic solution leads to improved cycle capacity maintaining ratio and low-temperature resistance characteristics by forming a metal salt that stabilizes the negative electrode film, preventing side reactions and maintaining battery performance in cold conditions.
Implementation Method 1
the non-aqueous electrolytic solution contains a compound represented by the following formula (1)... which includes an organic group with a heteroatom, a sulfur, phosphorus, or carbon atom, and an alkylene group, is used to enhance the thermal stability of the negative electrode film, thereby improving the battery's cycle capacity and low-temperature resistance
Implementation Method 2
a non-aqueous electrolytic solution is obtained by dissolving an electrolyte, such as LiPF6, LiBF4, LiClO4, LiCF3SO3, LiAsF6, LiN(CF3SO2)2, or LiCF3(CF2)3SO3, in a non-aqueous solvent
Data Source
AI summary
A task is to provide a non-aqueous electrolytic solution exhibiting excellent cycle capacity maintaining ratio and excellent low-temperature resistance characteristics and a non-aqueous electrolyte secondary battery using the same. An object of the present invention is to provide a non-aqueous electrolytic solution which improves the cycle capacity maintaining ratio and low-temperature resistance characteristics, and a non-aqueous electrolyte secondary battery using the non-aqueous electrolytic solution. The present invention is a non-aqueous electrolytic solution comprising an electrolyte and a non-aqueous solvent dissolving therein the electrolyte, wherein the non-aqueous electrolytic solution contains a compound represented by formula (1) (wherein X represents an organic group containing a heteroatom, Y represents a sulfur atom, a phosphorus atom, or a carbon atom, n represents an integer of 1 or 2, m represents an integer of 2 to 4, l represents an integer of 1 or 2, and Z represents an organic group having 4 to 12 carbon atoms and optionally having a heteroatom), and a non-aqueous electrolyte secondary battery comprising the non-aqueous electrolytic solution.