Conductive Polymer Electrode Water Removal via CO2 Atmosphere
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Solution Overview
Problem
Conventional lithium-ion electrochemical devices using conductive polymers as positive electrodes face issues with water content affecting capacitance and internal resistance, leading to insufficient battery characteristics and reliability.
Innovation Solution
A method for manufacturing electrochemical devices involving the formation of a positive electrode with a conductive polymer layer on a current collector, a negative electrode with lithium-occluding material on another collector, and a separator, with the entire assembly being sealed in an electrolytic solution. The process includes holding the components in a depressurized atmosphere and introducing CO2 to remove water and adsorb CO2, which helps in suppressing capacitance decrease and internal resistance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing methods are used for electrochemical devices with conductive polymer positive electrodes, then production is simpler and faster, but water content in the electrode affects capacitance and internal resistance, leading to insufficient battery characteristics and reliability
Solution Approach 1:
The patent applies preliminary action by performing depressurization and CO2 gas introduction treatments during the manufacturing process to remove water from the conductive polymer positive electrode before final assembly. This preliminary water removal prevents subsequent performance degradation and reliability issues, ensuring stable capacitance and internal resistance characteristics while maintaining a feasible manufacturing workflow.
Solution Approach 2:
The patent utilizes an inert atmosphere approach by introducing CO2 gas into the manufacturing environment to create a water-free atmosphere. The CO2 atmosphere prevents water contamination of the conductive polymer electrode during critical manufacturing steps, thereby improving battery reliability without significantly complicating the manufacturing process.
2Reliability
If water is not removed from the positive electrode, then the manufacturing process is simpler, but capacitance decreases and internal resistance increases over time
Solution Approach 1:
The patent applies parameter changes by modifying the pressure and gas composition parameters during manufacturing. Specifically, the process involves depressurizing the manufacturing environment and then introducing CO2 gas, thereby changing the atmospheric parameters to achieve water removal from the electrode while maintaining manufacturing simplicity.
3Reliability
If CO2 gas introduction step is added to remove water, then battery characteristics and reliability improve, but manufacturing process becomes more complex
Solution Approach 1:
The patent utilizes an inert atmosphere approach by introducing CO2 gas into the manufacturing environment to create a water-free atmosphere. The CO2 atmosphere prevents water contamination of the conductive polymer electrode during critical manufacturing steps, thereby improving battery reliability 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
The method results in an electrochemical device with improved battery characteristics and reliability, as evidenced by stable capacitance and resistance during float tests, and reduced gas generation.
Implementation Method 1
introducing gas containing CO2 as a primary component into the depressurized atmosphere
Implementation Method 2
holding the positive electrode in depressurized atmosphere
Implementation Method 3
holding the positive electrode in depressurized atmosphere and then introducing gas containing CO2 as a primary component into the depressurized atmosphere
Data Source
AI summary
A method for manufacturing an electrochemical device includes the following steps: a step of preparing a positive electrode, the positive electrode including a first current collector and a positive electrode layer containing a conductive polymer; a step of preparing a negative electrode, the negative electrode including a second current collector and a negative electrode layer; and a step of sealing the positive electrode, the negative electrode, and an electrolytic solution in an exterior body. The step of preparing the positive electrode includes a step of holding the positive electrode in depressurized atmosphere and then introducing gas containing CO2 as a primary component into the depressurized atmosphere.