Carbon Negative Electrode and Imide Electrolyte for Dense Secondary Batteries
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Solution Overview
Problem
Current secondary batteries do not achieve sufficient battery characteristics, particularly in terms of energy density and lithium ion insertion/extraction efficiency, due to limitations in the configuration of the negative electrode active material layer and electrolyte salt composition.
Innovation Solution
A secondary battery design featuring a negative electrode active material layer with a thickness of 30 μm to 100 μm and volume density of 1.4 g/cm3 to 2 g/cm3, utilizing a carbon material and an electrolyte salt with an imide anion, such as those represented by specific formulas, to enhance chemical stability and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the negative electrode active material layer thickness is increased to improve energy density, then the battery capacity increases, but the lithium ion insertion/extraction efficiency deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the negative electrode active material layer to be within 30 μm to 100 μm, and the volume density parameter to be within 1.4 g/cm³ to 2 g/cm³. This parameter optimization resolves the contradiction by finding the optimal balance point where sufficient capacity is achieved while maintaining good lithium ion insertion/extraction efficiency.
2Ease of manufacture
If conventional electrolyte salts are used to simplify battery design, then the manufacturing process is easier, but the chemical stability and battery characteristics are insufficient
Solution Approach 1:
The patent specifies using an imide anion with particular structural parameters (represented by formulas with specific R groups and functional groups) to achieve superior chemical stability while maintaining manufacturing feasibility. The structural parameters of the electrolyte salt are optimized to resolve the contradiction between ease of manufacture and chemical stability.
3Speed
If the negative electrode active material layer is made thinner to improve lithium ion insertion/extraction efficiency, then the response speed increases, but the energy density decreases
Solution Approach 1:
The patent determines the optimal thickness range of 30 μm to 100 μm for the negative electrode active material layer. This parameter optimization allows the battery to achieve both fast lithium ion insertion/extraction speed and high energy density, resolving the contradiction between response speed and energy storage capacity.
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 proposed design improves chemical stability, energy density, and lithium ion insertion/extraction efficiency, leading to superior battery characteristics, including increased cyclability, storage retention, and load retention rates.
Implementation Method 1
The electrolytic solution includes an electrolyte salt. The electrolyte salt includes an imide anion... lithium ion insertion/extraction efficiency
Implementation Method 2
The negative electrode active material layer includes a carbon material... superior battery characteristic... increased cyclability
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The negative electrode includes a negative electrode active material layer. The electrolytic solution includes an electrolyte salt. The negative electrode active material layer includes a carbon material. The negative electrode active material layer has a thickness of greater than or equal to 30 μm and less than or equal to 100 μm. The negative electrode active material layer has a volume density of greater than or equal to 1.4 g/cm3 and less than or equal to 2 g/cm3. The electrolyte salt includes an imide anion. 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).