Conductive Resin Current Collector with Ion Barrier Layer
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Solution Overview
Problem
Conventional current collectors for bipolar lithium ion secondary batteries have a low barrier property for lithium ions, leading to ion adsorption and capacity degradation due to the penetration of lithium ions into the current collector.
Innovation Solution
A current collector with a resin layer having electrical conductivity and an ion barrier layer containing ion trapping particles, where metal compounds are provided on the surfaces of metal containing particles to prevent lithium ion penetration and ensure reversible adsorption and release, maintaining discharge capacity and preventing internal short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a resin layer having electrical conductivity is used as a current collector, then weight is reduced and electrical conductivity is improved, but barrier property for lithium ions deteriorates leading to ion adsorption
Solution Approach 1:
The current collector uses a composite structure combining a resin layer with electrical conductivity and an ion barrier layer containing metal compounds. This composite material approach allows the resin layer to provide lightweight properties and electrical conductivity, while the ion barrier layer provides lithium ion barrier properties, thus resolving the contradiction between weight reduction and barrier property maintenance.
2Reliability
If metal compounds are added to prevent lithium ion penetration, then barrier property is improved, but device complexity increases
Solution Approach 1:
The current collector is segmented into two functional layers: a resin layer providing electrical conductivity and a separate ion barrier layer containing metal compounds. This segmentation allows each layer to perform its specific function independently, simplifying the design and manufacturing process while achieving the desired barrier property without excessive complexity.
3Power
If lithium ions penetrate into the current collector, then electrical conductivity is maintained, but capacity decreases due to adsorption
Solution Approach 1:
The ion barrier layer acts as an intermediary between the resin layer and the lithium ions. It selectively blocks lithium ions from penetrating into the resin layer while allowing electrical conductivity to be maintained through the resin layer, thus preventing capacity loss due to ion adsorption while preserving electrical conductivity.
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 solution effectively suppresses lithium ion adsorption in the current collector, maintaining battery capacity and preventing heat generation and temperature increases during internal short-circuits, while ensuring electrical conductivity and safety.
Implementation Method 1
The ion barrier layer contains ion trapping particles in which metal compounds are provided on surfaces of metal containing particles
Implementation Method 2
a resin layer having electrical conductivity
Data Source
AI summary
A current collector for a secondary battery (1) of the present invention includes a resin layer (2) having electrical conductivity, and an ion barrier layer (3) provided on the surface of the resin layer (2). The ion barrier layer (3) contains ion trapping particles (6) in which metal compounds (5) are provided on the surfaces of metal containing particles (4). The ion trapping particles (6) are continuously provided from an interface (7) between the resin layer (2) and the ion barrier layer (3) toward a surface (3a) of the ion barrier layer (3). Thus, the ion barrier layer (3) prevents from the entry of ions, so that the ion adsorption in the current collector (1) can be decreased.