Battery Electrode Composite Particles for Heat Absorption and Low Resistance
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Solution Overview
Problem
Non-aqueous electrolyte rechargeable batteries face challenges in safely managing internal temperature increases due to abnormalities like internal short circuits, and existing inorganic particles fail to adequately suppress temperature rises while also increasing electrical resistance.
Innovation Solution
Composite particles comprising metal hydroxide and conductive particles with specific properties, including volume resistivity, endothermic amounts, and thermal desorption characteristics, are used in the positive or negative electrodes to effectively manage internal temperature and reduce electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic particles (metal hydroxide particles) are included to suppress internal temperature increase, then thermal safety is improved, but electrical resistance increases
Solution Approach 1:
The patent applies composite materials by combining metal hydroxide particles with conductive particles to create composite particles that simultaneously provide thermal safety through endothermic decomposition and maintain electrical conductivity. The conductive particles compensate for the high resistivity of metal hydroxide particles, resolving the contradiction between thermal protection and electrical performance.
Solution Approach 2:
The patent merges two functional components - metal hydroxide particles for thermal safety and conductive particles for electrical conductivity - into a single composite particle system. This combination allows both functions to work together simultaneously, addressing the trade-off between thermal protection and electrical resistance.
2Temperature
If inorganic particles are included in electrodes to suppress temperature rise, then battery safety is improved, but volume resistivity increases
Solution Approach 1:
The patent creates composite particles combining metal hydroxide with conductive materials, where the conductive component offsets the high resistivity of metal hydroxide. This composite structure enables the particles to suppress internal temperature rise while maintaining acceptable volume resistivity for battery operation.
Solution Approach 2:
The patent changes the electrical parameter (volume resistivity) of the thermal protection particles by incorporating conductive materials. This parameter modification allows the particles to maintain their thermal protection function while improving their electrical properties to reduce overall battery resistance.
3Temperature
If conventional inorganic particles are used for heat absorption, then thermal management is improved, but battery performance deteriorates due to increased resistance
Solution Approach 1:
The patent uses composite particles that combine the heat absorption capability of metal hydroxide with the electrical conductivity of conductive particles. This composite approach maintains effective thermal management while minimizing the negative impact on battery performance and productivity.
Solution Approach 2:
The conductive particles act as an intermediary that bridges the electrical conductivity gap created by incorporating metal hydroxide particles. This intermediary component allows the thermal management system to function effectively without significantly degrading battery performance.
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 composite particles sufficiently suppress internal temperature increases and maintain low electrical resistance, enhancing the safety and cycle life of non-aqueous electrolyte rechargeable batteries.
Implementation Method 1
conductive particles... volume resistivity at the time of about 60 MPa pressurization is greater than or equal to about 0.10 Ωcm and less than or equal to about 4 × 10^4 Ωcm
Implementation Method 2
metal hydroxide particles having heat-absorption properties as endothermic particles... endothermic peak temperature in a differential scanning calorimetry method (DSC) of greater than or equal to about 270 °C and less than or equal to about 360 °C
Data Source
Figure 1
Figure 2
AI summary
The composite particles are composite particles including metal hydroxide particles and conductive particles, wherein a volume resistivity at the time of about 60 MPa pressurization is greater than or equal to about 0.10 Ωcm and less than or equal to about 4 × 104 Ωcm, an endothermic amount between about 50 °C to about 250 °C in differential scanning calorimetry is greater than or equal to about 150 J/g and less than or equal to about 500 J/g, and an amount of desorbed P2 (MS1) from about 80 °C to about 1400 °C by thermal desorption gas mass spectrometry (TOS-MS) is greater than or equal to about 300 × 10-6 mol/g and less than or equal to about 3000 × 10-6 mol/g.