Inorganic Particle Layer for Nonaqueous Battery Gas Management
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Solution Overview
Problem
Nonaqueous secondary batteries experience increased internal resistance and gas generation during high-temperature charged storage when using a nitrile group-containing compound, which can lead to reduced capacity and safety concerns.
Innovation Solution
Forming an inorganic particle layer between the positive electrode plate and the separator in a nonaqueous electrolyte secondary battery to trap decomposition products of the nitrile group-containing compound, preventing them from reaching the negative electrode and thus reducing gas generation and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nitrile group-containing compound is added to the nonaqueous electrolyte to improve cycling characteristics and high-temperature charged storage characteristics, then the battery capacity and charge-discharge cycling are improved, but gas generation and internal resistance increase during high-temperature charged storage
Solution Approach 1:
A porous layer containing inorganic particles is introduced as an intermediary between the positive electrode and the electrolyte. This porous layer traps the decomposition products (gas) generated by the nitrile group-containing compound, preventing them from accumulating and causing harmful effects while allowing the nitrile compound to continue improving cycling characteristics.
Solution Approach 2:
The invention employs a porous layer with inorganic particles that has controlled porosity to selectively trap gas decomposition products while maintaining ion transport. The porous structure allows the layer to absorb and retain the harmful gas molecules generated during high-temperature storage without blocking the electrolyte's ionic conductivity.
2Reliability
If a nitrile group-containing compound is added to the nonaqueous electrolyte to improve cycling characteristics, then the battery capacity is improved, but internal resistance increases during high-temperature charged storage
Solution Approach 1:
The porous layer with inorganic particles acts as a mediator that captures decomposition products before they can reach the electrodes and increase internal resistance. This intermediary structure prevents the buildup of resistive layers on the electrode surfaces while preserving the beneficial cycling characteristics provided by the nitrile compound.
3Reliability
If a nitrile group-containing compound is added to the nonaqueous electrolyte to improve high-temperature charged storage characteristics, then the battery capacity is improved, but decomposition products are generated that reach the negative electrode
Solution Approach 1:
The porous layer containing inorganic particles serves as a protective intermediary between the positive electrode (where decomposition occurs) and the negative electrode. It selectively traps the decomposition products in its porous structure, preventing them from migrating to and damaging the negative electrode while allowing the nitrile compound to function.
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 inorganic particle layer effectively minimizes gas generation and internal resistance increase, maintaining high residual capacity and safety during high-temperature charged storage.
Implementation Method 1
A layer of inorganic particles is formed between the positive electrode plate and the separator or between the negative electrode plate and the separator... to trap decomposition products of the nitrile group-containing compound
Data Source
Figure 1A~1C
AI summary
To provide a nonaqueous electrolyte secondary battery with a small increase in internal resistance and less gas generation during high-temperature charged storage, and with a high residual capacity, when using a non-aqueous electrolyte containing a nitrile group-containing compound. The nonaqueous electrolyte secondary battery includes a positive electrode plate containing positive electrode active material, a negative electrode plate containing negative electrode active material, a nonaqueous electrolyte containing a nitrile group-containing compound, and a separator provided between the positive electrode plate and the negative electrode plate, and is also provided with a layer of inorganic particles between the positive electrode plate and the separator or between the negative electrode plate and the separator. It is preferable that the layer of inorganic particles be formed on a surface of the positive electrode plate.