Composite Battery Particles for Internal Temperature Suppression
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Solution Overview
Problem
Existing non-aqueous electrolyte rechargeable batteries, such as lithium ion batteries, face challenges in safely managing internal temperature rises due to oxidative decomposition reactions, leading to potential short circuits and performance deterioration when using radical scavengers and endothermic particles alone.
Innovation Solution
Composite particles incorporating metal hydroxides with modified surfaces and phosphoric acid compounds are developed, providing both radical trapping and endothermic properties, optimized for particle size and specific surface area to effectively suppress internal temperature increases and maintain battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radical scavengers or endothermic particles are added to suppress internal temperature rise, then battery safety is improved, but cycle characteristics deteriorate
Solution Approach 1:
The patent combines radical scavenging agents (phosphoric acid compounds) and endothermic substances (metal hydroxides) into a single composite particle system. This merging allows both safety functions to be achieved simultaneously while maintaining battery cycle characteristics, as the composite particles work synergistically to suppress internal temperature rise without the detrimental effects of separate additives.
Solution Approach 2:
The invention uses composite particles consisting of metal hydroxide cores coated with phosphoric acid compounds. This composite structure provides both the endothermic properties of metal hydroxides and the radical scavenging ability of phosphoric acid compounds, achieving improved safety while maintaining battery performance and cycle characteristics.
2Temperature
If heat suppressing additives are incorporated into the battery, then internal temperature rise is suppressed, but battery performance declines
Solution Approach 1:
The patent optimizes the particle size parameters of the composite particles, specifying a diameter of 0.1 to 10 micrometers with a preferred range of 0.5 to 5 micrometers. This parameter optimization ensures sufficient surface area for heat suppression while maintaining appropriate dispersion and electrochemical performance, thus suppressing internal temperature rise without declining battery productivity.
Solution Approach 2:
The composite particles are strategically distributed within the battery system to provide localized heat suppression where needed. The metal hydroxide core provides endothermic cooling at specific locations while the phosphoric acid compound coating provides radical scavenging at the same locations, achieving localized temperature control without overall performance loss.
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 successfully prevent internal temperature rises and maintain battery cycle characteristics by combining radical trapping and endothermic effects, enhancing safety and performance in lithium ion batteries.
Implementation Method 1
incorporate endothermic particles made of a metal hydroxide with endothermic properties
Implementation Method 2
incorporate a binder including a radical scavenging agent such as phosphate ester with radical trapping ability
Data Source
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AI summary
Provided are composite particles for a non-aqueous electrolyte rechargeable battery that can sufficiently suppress the rise in the internal temperature of the battery even under environments where the internal temperature is likely to rise.