Secondary Battery Formation for TNO Anodes Without Dendrite Risk
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Solution Overview
Problem
Secondary batteries using carbon-based negative electrodes face issues with dendrite precipitation during rapid charge and discharge, leading to safety concerns and reduced cycle life due to volume changes in niobium-titanium oxide electrodes.
Innovation Solution
A production method for secondary batteries involves preparing a precursor with a positive electrode, a negative electrode made of niobium-titanium oxide, and an electrolyte, adjusting the negative electrode potential to a range of 0.6 V to 1.5 V, and holding this potential adjusted state at a temperature between 60°C and 82°C to eliminate water-derived gas generation and enhance battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If niobium-titanium oxide is used in the negative electrode to increase charge-discharge capacity and input performance, then the energy density and charge performance are improved, but the output performance decreases and cycle life is reduced due to volume change during Li insertion and extraction
Solution Approach 1:
The patent applies potential adjustment (changing the electrochemical potential parameter) and temperature control (changing the thermal parameter) to modify the behavior of niobium-titanium oxide during charge-discharge cycles. By holding the negative electrode potential within 0.6-1.5 V vs. Li/Li+ and controlling temperature at 60-82°C, the volume change of TNO is suppressed, preventing particle cracking and maintaining cycle life while preserving high charge-discharge capacity.
Solution Approach 2:
The patent performs preliminary potential adjustment and temperature treatment during the battery formation process before normal operation. This preliminary action establishes optimal conditions that prevent subsequent volume-induced cracking during cycling, thereby extending cycle life while maintaining the high capacity benefits of TNO.
2Power
If rapid charge and discharge is performed to improve power output and charging time, then the power performance is enhanced, but dendrite precipitation occurs on carbon-based negative electrodes causing safety issues and reduced reliability
Solution Approach 1:
The patent replaces the conventional carbon-based negative electrode with niobium-titanium oxide, which inherently prevents dendrite formation during rapid charge-discharge. Although TNO has lower theoretical capacity than carbon, the potential adjustment and temperature control methods enable it to deliver high power output without the safety risks of dendrite precipitation, effectively substituting a material with safety issues for one without.
Solution Approach 2:
By adjusting the negative electrode potential to 0.6-1.5 V vs. Li/Li+ and controlling temperature at 60-82°C, the patent modifies the electrochemical and thermal parameters to prevent lithium deposition on the negative electrode during rapid charge-discharge, thereby eliminating dendrite formation and associated safety hazards while maintaining high power output.
3Quantity of substance
If carbon-based negative electrode is used to achieve high energy density, then the energy storage capacity is improved, but dendrite precipitation and internal short circuits occur during rapid charge and discharge
Solution Approach 1:
The patent substitutes carbon-based negative electrode material with niobium-titanium oxide, which does not suffer from dendrite precipitation issues. Although TNO has different energy density characteristics, the potential adjustment and temperature control methods enable it to provide safe rapid charge-discharge performance without the harmful dendrite formation that plagues carbon-based electrodes.
Solution Approach 2:
The patent changes the electrochemical potential parameter (holding negative electrode potential at 0.6-1.5 V vs. Li/Li+) and thermal parameter (controlling temperature at 60-82°C) to fundamentally alter the charge-discharge behavior, preventing lithium deposition and dendrite formation on the negative electrode while maintaining high energy density through optimized TNO composition and structure.
4Use of energy by moving object
If volume change in niobium-titanium oxide is allowed during charge and discharge to maintain high capacity, then the charge-discharge capacity is improved, but particle cracking occurs breaking electron conduction paths and increasing internal resistance
Solution Approach 1:
The patent applies potential adjustment (holding negative electrode potential at 0.6-1.5 V vs. Li/Li+) and temperature control (maintaining temperature at 60-82°C) to suppress the volume change of niobium-titanium oxide during charge-discharge cycles. This parameter control prevents particle cracking and maintains structural integrity of the electrode material, preserving electron conduction paths and keeping internal resistance low while maintaining high charge-discharge capacity.
Solution Approach 2:
The patent performs preliminary potential adjustment and temperature treatment during battery formation to establish conditions that suppress volume change before normal operation begins. This preliminary action prevents structural degradation and particle cracking from occurring during subsequent cycling, maintaining long-term structural integrity and high 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 method produces secondary batteries with high output performance and durability, reducing gas generation and internal resistance, and minimizing performance degradation even after repeated charge and discharge cycles.
Implementation Method 1
adjusting a negative electrode potential of the negative electrode to a range of 0.6 V or more and less than 1.5 V based on oxidation-reduction potential of lithium
Implementation Method 2
holding the potential adjusted state at a temperature in a range of greater than 60°C and 82°C or less
Data Source
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AI summary
According to one approach, a production method of a secondary battery is provided. The method includes preparing a secondary battery precursor (100) including a positive electrode (5), a negative electrode (3), and an electrolyte, adjusting a negative electrode potential of the negative electrode (3) to a range of 0.6 V or more and less than 1.5 V based on oxidation-reduction potential of lithium, thereby providing a potential adjusted state, and holding the potential adjusted state at a temperature in a range of greater than 60°C and 82°C or less.