Nonaqueous Electrolyte Battery Suppressing Gas Generation
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Solution Overview
Problem
Nonaqueous electrolyte secondary batteries using titanium-containing oxides as negative electrodes face issues with gas generation during charge/discharge cycles, leading to decreased battery characteristics and stability.
Innovation Solution
Incorporating spinel type lithium manganate with cobalt compounds and lithium-transition metal composite oxides in specific ratios, along with specific organic compounds in the electrolyte, to suppress gas generation and enhance cycle stability and charging rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium-containing oxide is used as negative electrode active material, then battery safety is improved, but gas generation occurs during charge/discharge cycle
Solution Approach 1:
The patent introduces a specific electrolyte composition containing cyclic carbonate and chain carbonate as intermediary substances that mediate between the titanium-containing oxide negative electrode and the positive electrode. This electrolyte system suppresses gas generation by controlling the electrochemical reactions at the electrode-electrolyte interface, while maintaining the safety benefits of titanium-containing oxide.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by specifying precise ratios of cyclic carbonate (15-30 vol%) and chain carbonate (70-85 vol%), along with controlled water content (0.003-0.03 mass%). These parameter changes optimize the electrolyte's ability to suppress gas generation while maintaining battery safety and performance.
2Reliability
If titanium-containing oxide is used as negative electrode active material, then battery safety is improved, but cycle stability decreases due to gas generation
Solution Approach 1:
The optimized electrolyte composition acts as a mediator that prevents harmful gas generation during cycling, thereby improving cycle stability. The specific combination of cyclic and chain carbonates with controlled water content creates a stable electrolyte system that maintains consistent battery performance over repeated charge/discharge cycles.
Solution Approach 2:
The patent uses a composite electrolyte system combining cyclic carbonate and chain carbonate in specific ratios, along with controlled water content. This composite electrolyte material provides both the safety benefits of titanium-containing oxide and improved cycle stability by suppressing gas generation through synergistic effects of the electrolyte components.
3Ease of manufacture
If conventional electrolyte composition is used, then manufacturing is simple, but charging rate characteristic is poor
Solution Approach 1:
The patent optimizes electrolyte composition parameters (cyclic carbonate 15-30 vol%, chain carbonate 70-85 vol%, water 0.003-0.03 mass%) to achieve both improved charging rate characteristics and manufacturability. These parameter changes enhance ion conductivity and charging performance while maintaining a practical manufacturing process.
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 solution effectively reduces gas generation, improves cycle stability, and increases charging rates in nonaqueous electrolyte secondary batteries, maintaining battery performance over time.
Implementation Method 1
the positive electrode contains, as a positive electrode active material, a spinel type lithium manganate represented by Li1+xMyMn2−x−yO4 wherein 0≤x≤0.2; 0≤y≤0.65
Implementation Method 2
the nonaqueous electrolyte secondary battery hardly generates gases during the charge/discharge cycle
Implementation Method 3
the nonaqueous electrolyte contains one compound selected from the group consisting of an organic compound having an oxalic acid backbone, an organic compound having an isocyanate group, a lithium salt of an organic compound having a sulfonic acid backbone, and a succinic anhydride compound having a side chain with 3 or more carbon atoms
Data Source
AI summary
A nonaqueous electrolyte secondary battery, wherein the negative electrode contains a titanium-containing oxide; the positive electrode contains a spinel type lithium manganate, and a cobalt-containing compound and/or a lithium-transition metal composite oxide having a stratified rock salt type structure; and the nonaqueous electrolyte contains one compound selected from the group consisting of an organic compound having an oxalic acid backbone, an organic compound having an isocyanate group, a lithium salt of an organic compound having a sulfonic acid backbone, and a succinic anhydride compound having a side chain with 3 or more carbon atoms in a content of 0.01 to 5% by weight with respect to 100% by weight of the nonaqueous electrolyte.