Positive electrode for non-aqueous electrolyte rechargeable battery, and non-aqueous electrolyte rechargeable battery
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Solution Overview
Problem
Conventional intermediate layers in non-aqueous electrolyte rechargeable batteries, such as those used in lithium ion batteries, are insufficient in reducing or suppressing short-circuits caused by foreign substances piercing the positive electrode, leading to potential safety hazards due to high temperature rise.
Innovation Solution
Incorporating an intermediate layer with first particles of boron nitride and second particles comprising a metal hydroxide and a flame retardant component, where the first particles have an aspect ratio of 3.0 to 30 and the second particles are endothermic and radical-scavenging, to deform and capture active oxygen, thereby reducing exposure of the positive electrode current collector and suppressing temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate layer is installed between the positive electrode current collector and the positive electrode mixture layer to prevent short-circuit, then short-circuit resistance is improved, but the complexity of the electrode structure increases
Solution Approach 1:
An intermediate layer is installed between the positive electrode current collector and the positive electrode mixture layer. This intermediate layer includes first particles (insulating particles) and second particles (flame retardant particles), serving as a mediator that prevents direct contact between the current collector and mixture layer, thereby resisting short-circuits while maintaining structural organization.
2Reliability
If conventional intermediate layers are used to prevent short-circuit, then short-circuit protection is provided, but the temperature rise suppression effect is insufficient
Solution Approach 1:
The intermediate layer is constructed as a composite material system comprising first particles (insulating particles) and second particles (flame retardant particles). This composite structure provides both short-circuit protection through electrical insulation and temperature rise suppression through the flame retardant properties of the second particles, thereby simultaneously addressing both reliability and temperature control requirements.
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 intermediate layer effectively reduces the risk of short-circuits and temperature rise by deforming to cover the collector and capturing active oxygen, enhancing battery safety.
Implementation Method 1
the intermediate layer including the first particles may be substantially deformed along the surface shape of a positive electrode current collector when pierced by a foreign substance such as, e.g., a nail, and exposure of the positive electrode current collector may be reduced or suppressed
Implementation Method 2
The boron nitride may capture active oxygen, thereby reducing or suppressing decomposition reaction of an electrolyte solution and thus reducing or suppressing temperature rise of the battery
Implementation Method 3
the intermediate layer further includes second particles including at least one of a metal hydroxide and a metal oxide and a flame retardant component, the temperature rise of the battery can be further reduced or suppressed, and safety can be substantially improved by the effect of reducing or suppressing the endothermic reaction of the electrolyte solution by the metal hydroxide or the metal oxide
Implementation Method 4
the temperature rise of the battery can be further reduced or suppressed, and safety can be substantially improved by the effect of reducing or suppressing the endothermic reaction of the electrolyte solution by the metal hydroxide or the metal oxide and decomposition reaction by radical capture by the flame retardant component
Data Source
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AI summary
The present disclosure improves a short-circuit reduction or suppression effect of a non-aqueous electrolyte rechargeable battery more effectively by reducing or suppressing exposure of a positive electrode current collector when pierced by a foreign substance such as a nail. Example embodiments include a positive electrode for a non-aqueous electrolyte rechargeable battery including a positive electrode current collector, a positive electrode mixture layer, an intermediate layer between the positive electrode current collector and the positive electrode mixture layer.