Secondary Battery Electrolyte and Cathode Composition for Cyclability
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Solution Overview
Problem
Current secondary batteries do not achieve sufficient battery characteristics, particularly in terms of cyclability, storage, and load retention, due to inadequate content of lithium carbonate and lithium hydroxide in the positive electrode active material and the absence of imide anions in the electrolyte salt.
Innovation Solution
A secondary battery configuration with a positive electrode active material containing lithium carbonate and lithium hydroxide within specific weight percentages and an electrolyte salt including imide anions, which facilitates better lithium ion insertion and extraction, preventing electrolyte decomposition and enhancing migration velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of lithium carbonate and lithium hydroxide in the positive electrode active material is increased, then the battery characteristic is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies precise parameter ranges for lithium carbonate (0.03-5 wt%) and lithium hydroxide (0.03-5 wt%) contents in the positive electrode active material. By defining these specific parameter ranges, the patent transforms the manufacturing process into one with controlled variable parameters, enabling systematic optimization of battery characteristics while maintaining manufacturability through clear specification limits.
2Reliability
If imide anions are added to the electrolyte salt, then the migration velocity of lithium ions is enhanced and electrolyte decomposition is prevented, but the device complexity increases
Solution Approach 1:
The patent employs imide anions with specific molecular structures (containing W1, W2, W3 groups that are carbonyl, sulfinyl, or sulfonyl groups) as composite electrolyte components. These structurally complex anions function as multi-functional additives that simultaneously prevent electrolyte decomposition and enhance lithium ion migration, achieving multiple benefits through a single composite material approach rather than multiple separate additives.
3Duration of action of stationary object
If the content of lithium carbonate and lithium hydroxide is optimized within specific ranges, then cyclability and storage retention are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent establishes specific parameter ranges for lithium carbonate (0.03-5 wt%) and lithium hydroxide (0.03-5 wt%) contents that directly correlate with improved cyclability and storage retention. By defining these quantitative parameters with clear lower and upper bounds, the patent transforms complex manufacturing optimization into a systematic parameter control process, making it easier to achieve consistent high performance through controlled variable adjustment rather than trial-and-error approaches.
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
This configuration improves cyclability, storage retention, and load retention rates by ensuring appropriate surface element distribution and preventing electrolyte decomposition, leading to superior battery performance across various temperature conditions.
Implementation Method 1
facilitates better lithium ion insertion and extraction
Implementation Method 2
preventing electrolyte decomposition and enhancing migration velocity
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material. The electrolytic solution includes an electrolyte salt. The positive electrode active material includes a lithium-containing compound, lithium carbonate, and lithium hydroxide. A content of lithium carbonate in the positive electrode active material is greater than or equal to 0.2 wt % and less than or equal to 0.7 wt %. A content of lithium hydroxide in the positive electrode active material is greater than or equal to 0.2 wt % and less than or equal to 0.7 wt %. The electrolyte salt includes an imide anion, and the imide anion includes at least one of a first imide anion represented by Formula (1), a second imide anion represented by Formula (2), a third imide anion represented by Formula (3), or a fourth imide anion represented by Formula (4).