Secondary Battery Potential Conditioning for Moisture-Induced Gas Suppression
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Solution Overview
Problem
Nonaqueous electrolyte secondary batteries face challenges with moisture-induced gas generation, leading to battery swelling and increased resistance, despite treatments like heating and drying.
Innovation Solution
A method of producing secondary batteries involves preparing a battery architecture with a lithium-nickel-cobalt-manganese composite oxide positive electrode and a niobium-titanium composite oxide negative electrode, adjusting the electrode potentials to specific ranges, and holding the battery at a temperature between 50°C and 90°C to achieve a potential adjusted state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating and drying treatments are performed to remove moisture, then moisture content is reduced, but trace moisture remains and gas generation still occurs during battery operation
Solution Approach 1:
The patent performs preliminary charge-discharge cycles and aging treatments before final sealing to proactively generate and remove gas from residual moisture. This preliminary action prevents gas generation during actual battery operation, resolving the contradiction between achieving low moisture content and preventing gas generation from trace moisture.
Solution Approach 2:
The patent converts the harmful effect of residual moisture (gas generation) into a beneficial process by intentionally allowing controlled gas generation during preliminary charge-discharge cycles and aging treatments. The generated gas is then removed, leaving a battery with improved performance and no gas generation during normal operation.
2Object-generated harmful factors
If charge-and-discharge and aging treatments are performed to remove gas from moisture, then gas generation is reduced, but battery resistance increases due to current load concentration
Solution Approach 1:
The patent optimizes the parameters of charge-discharge cycles and aging treatments, including voltage ranges, temperature conditions, and cycle durations. By carefully controlling these parameters, the patent achieves effective gas removal while minimizing the increase in battery resistance, thus resolving the contradiction between reducing gas generation and maintaining low resistance.
3Object-generated harmful factors
If electrode potentials are adjusted to specific ranges and holding treatment is applied, then gas generation is suppressed, but manufacturing process complexity increases
Solution Approach 1:
The patent specifies precise potential ranges for the positive electrode (3.4-3.9V) and negative electrode (1.5-2.0V) relative to lithium, along with holding temperatures (50-90°C). These parameter specifications create a controlled environment that suppresses gas generation while forming stable protective films on electrodes, resolving the contradiction between reducing gas generation and maintaining process simplicity.
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 reduces gas generation and increases battery resistance, enabling high output performance from low to high temperatures and maintaining life performance even under high temperature conditions.
Implementation Method 1
holding a battery architecture in a potential adjusted state at a holding temperature
Implementation Method 2
an electrolyte including one or more first organic solvents
Implementation Method 3
adjusting a positive electrode potential of the positive electrode and adjusting a negative electrode potential of the negative electrode
Data Source
AI summary
According to one embodiment, a method of producing a secondary battery is provided. The method includes preparing a battery architecture including a positive electrode, a negative electrode, and an electrolyte; adjusting a positive electrode potential to a range of 3.4 V to 3.9 V and a negative electrode potential to a range of 1.5 V to 2.0 V based on an oxidation-reduction potential of lithium, thereby providing a potential adjusted state; and holding the battery architecture in the potential adjusted state at a holding temperature of 50° C. to 90° C. The positive electrode includes a lithium-nickel-cobalt-manganese composite oxide. The negative electrode includes a niobium-titanium composite oxide. The electrolyte includes one or more first organic solvent having a viscosity of 1 cP or less.