Battery Electrolyte Sequencing for Faster Aging and Foreign Matter Removal
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Solution Overview
Problem
The existing battery manufacturing methods face challenges in efficiently dissolving and precipitating foreign stainless steel materials (SUS304 and SUS430) from the electrode body during aging treatment, which prolongs the manufacturing process and increases complexity.
Innovation Solution
A method involving two electrolytic solutions is introduced, where a first electrolytic solution containing lithium bis(fluorosulfonyl)imide (LiFSI) is injected into the electrode body, followed by a first aging step, and then a second electrolytic solution without LiFSI, potentially containing lithium hexafluorophosphate (LiPF6), is injected for a second aging step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aging treatment is performed for a long amount of time to dissolve and precipitate foreign stainless steel materials, then the foreign matters can be effectively removed, but the manufacturing process complexity increases and production efficiency decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by adding specific additives (sulfonamide compound and/or carboxylic acid compound) to enable effective foreign matter removal with shorter aging time. This parameter modification allows the electrolytic solution to dissolve stainless steel foreign matters more efficiently without requiring prolonged aging treatment.
Solution Approach 2:
The patent performs preliminary action by adding specific chemical additives to the electrolytic solution before the aging treatment begins. These additives pre-condition the electrolytic solution to have enhanced dissolving capability for stainless steel foreign matters, enabling the aging process to be completed more quickly and efficiently.
2Reliability
If aging treatment is performed for a long amount of time to dissolve and precipitate foreign stainless steel materials, then the foreign matters can be effectively removed, but production efficiency decreases
Solution Approach 1:
By modifying the electrolytic solution composition with specific additives, the patent accelerates the dissolving rate of stainless steel foreign matters. This parameter change reduces the required aging treatment duration, thereby improving production efficiency while maintaining effective foreign matter removal.
Solution Approach 2:
The patent enables the aging treatment process to rush through more quickly by using electrolytic solutions enhanced with specific additives. These additives facilitate rapid dissolution and precipitation of foreign matters, allowing the process to complete in shorter time without sacrificing removal effectiveness.
3Ease of manufacture
If conventional electrolytic solutions are used for aging treatment, then the manufacturing process is simple, but foreign stainless steel materials cannot be effectively dissolved and precipitated
Solution Approach 1:
The patent modifies the electrolytic solution composition by adding specific compounds (sulfonamide and/or carboxylic acid) to enhance its chemical reactivity with stainless steel foreign matters. This parameter change enables effective dissolution and precipitation of foreign matters while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The patent introduces specific chemical compounds (sulfonamide compound and/or carboxylic acid compound) as intermediaries that facilitate the interaction between the electrolytic solution and stainless steel foreign matters. These intermediary substances enable effective foreign matter removal without significantly complicating the 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
This method significantly shortens the overall aging treatment time by efficiently dissolving and precipitating foreign stainless steel materials in the first and second aging steps, respectively, thereby simplifying the manufacturing process.
Implementation Method 1
a first injection step of injecting a first electrolytic solution that contains lithium bis(fluorosulfonyl)imide into an electrode body
Implementation Method 2
a second injection step of injecting a second electrolytic solution that does not contain lithium bis(fluorosulfonyl)imide into the electrode body after the first aging step
Data Source
AI summary
A method for manufacturing a battery, including: a first injection step of injecting a first electrolytic solution that contains lithium bis(fluorosulfonyl)imide into an electrode body having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a first charging step of performing first charging after the first injection step; a first aging step of performing aging treatment after the first charging step; a second injection step of injecting a second electrolytic solution that does not contain lithium bis(fluorosulfonyl)imide into the electrode body after the first aging step; a second charging step of performing second charging after the second injection step; and a second aging step of performing aging treatment after the second charging step.