Energy Storage Cell Sealing With Soluble Gas to Limit Electrode Gaps
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Solution Overview
Problem
The generation of gas during initial charge-discharge in energy storage devices leads to increased inter-electrode distance, causing current unevenness and metal lithium electrodeposition, which existing technologies have not adequately addressed.
Innovation Solution
A method involving housing a gas soluble in the electrolyte solution within the case before sealing, creating a negative pressure atmosphere to dissolve the gas and reduce inter-electrode distance, using a sealable case to maintain this state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additive is added to the electrolyte solution to improve characteristics such as capacity retention ratio, then the energy storage characteristics are improved, but gas is generated during initial charge-discharge causing inter-electrode distance to increase and metal lithium electrodeposition to occur
Solution Approach 1:
The patent converts the harmful gas generated during initial charge-discharge into a beneficial component by introducing CO2 gas that reacts with the electrolyte solution to form carbonic acid, which then reacts with lithium hydroxide to form lithium carbonate coating on the electrodes. This coating prevents further gas generation and metal lithium electrodeposition, thus converting the harmful gas evolution into a protective mechanism.
Solution Approach 2:
The patent changes the chemical parameters of the electrolyte solution by controlling the concentration of lithium hydroxide (0.01-10 wt%) and the amount of CO2 gas introduced. These parameter changes enable the formation of a stable lithium carbonate coating on the electrodes, which suppresses gas generation and prevents inter-electrode distance increase while maintaining good capacity retention ratio.
2Quantity of substance
If the inter-electrode distance increases due to gas accumulation, then gas is generated, but current unevenness occurs and metal lithium electrodeposition occurs
Solution Approach 1:
The patent converts the harmful effect of gas accumulation into a beneficial coating formation process. By introducing CO2 gas that reacts with the electrolyte to form lithium carbonate, the gas evolution is transformed into a protective mechanism that maintains uniform inter-electrode distance and prevents metal lithium electrodeposition.
Solution Approach 2:
The patent controls the chemical parameters including lithium hydroxide concentration (0.01-10 wt%) and CO2 gas amount to achieve optimal coating formation. This parameter control ensures uniform inter-electrode distance is maintained while utilizing gas evolution for beneficial coating formation rather than harmful accumulation.
3Object-generated harmful factors
If no additive is used in the electrolyte solution, then gas generation is reduced, but inter-electrode distance still increases due to oxidation-reduction decomposition of the electrolyte solution
Solution Approach 1:
The patent applies the same beneficial mechanism regardless of additive presence. By introducing CO2 gas that forms lithium carbonate coating, it addresses both types of gas generation (from additives and from electrolyte decomposition), converting both harmful gas evolution processes into beneficial coating formation that prevents inter-electrode distance increase.
Solution Approach 2:
The patent uses parameter changes in the electrolyte composition (lithium hydroxide concentration: 0.01-10 wt%) and CO2 gas amount to create a robust system that suppresses inter-electrode distance increase from both additive decomposition and electrolyte decomposition, maintaining stable performance regardless of additive presence.
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 effectively suppresses the increase in inter-electrode distance, preventing metal lithium electrodeposition and enhancing the stability of the energy storage device.
Implementation Method 1
housing a gas, soluble in the electrolyte solution, in the case after the electrolyte solution is housed in the case
Implementation Method 2
an inside of the case has an atmosphere in a negative pressure state
Data Source
AI summary
A method for manufacturing an energy storage device according to one aspect of the present invention includes: housing, in a case, an electrode assembly in which a negative electrode and a positive electrode are stacked; housing an electrolyte solution in the case; housing a gas, soluble in the electrolyte solution, in the case after the electrolyte solution is housed in the case; and sealing the case in a state where the gas soluble in the electrolyte solution is housed in the case.