Separator, electrochemical apparatus, and electronic apparatus
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Solution Overview
Problem
Existing electrochemical apparatus separators fail to adequately enhance low-temperature performance and cycle performance, which are critical for applications in consumer electronics, energy storage, and new energy vehicles.
Innovation Solution
A separator design featuring a substrate layer, an inorganic coating, and a bonding layer with bonded particles having protrusions of 20-100 nm diameter, increasing contact sites and bonding forces with electrode plates, and incorporating inorganic particles like aluminum oxide to improve mechanical strength and electrolyte transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional separator structure is used, then the manufacturing process is simple, but the low-temperature performance and cycle performance are insufficient
Solution Approach 1:
The separator employs a composite structure consisting of a substrate layer, an inorganic coating layer, and a bonding layer containing bonded particles with protrusions. This multi-layer composite design enhances cycle performance and low-temperature performance while maintaining manufacturing feasibility through established coating and bonding techniques.
Solution Approach 2:
The bonding layer contains bonded particles with surface protrusions that create localized high-bonding-force regions at the interface with electrode plates. The inorganic coating provides localized thermal stability and mechanical strength enhancement. This local quality approach improves overall separator performance without requiring complete structural redesign.
2Reliability
If the bonding layer has high bonding force with electrode plates, then cycle performance improves, but the complexity of the separator structure increases
Solution Approach 1:
The bonded particles in the bonding layer feature spherical surfaces with protrusions, creating multiple contact points with the electrode plates. This spherical geometry with surface features maximizes bonding force through increased contact area and mechanical interlocking, while the particulate nature simplifies the overall layer structure compared to continuous bonding materials.
3Reliability
If the separator retains more electrolyte solution, then ion conduction improves, but the volume of the separator increases
Solution Approach 1:
The separator utilizes porous structures in the substrate layer and bonding layer that can absorb and retain electrolyte solution within the pore spaces. This porous architecture increases ion conduction pathways and electrolyte retention without significantly increasing the overall separator volume, as the pores are void spaces within the existing structure rather than additional material.
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
Enhances cycle performance, low-temperature performance, and energy density by improving electrolyte retention and ion conduction, thereby extending the service life of electrochemical apparatuses.
Implementation Method 1
the formation of the protrusions increases contact sites between the bonding layer and a positive electrode plate or a negative electrode plate, which is conducive to increasing interface bonding forces between the bonding layer and electrode plates
Implementation Method 2
the protrusions can further be embedded in a positive active material layer or a negative active material layer to further increase the bonding forces between the bonding layer and the electrode plates
Implementation Method 3
The protrusions increase the volume of the bonded particle, which is conducive to improving the capacity of the separator to retain an electrolyte solution
Implementation Method 4
conductive to improving conduction of lithium ions as well as improving the cycle performance and low-temperature performance of the electrochemical apparatus
Implementation Method 5
improving transmission of the electrolyte solution between the bonding layer and the active material layers in the electrode plates, and in turn, conducive to improving conduction of active ions
Data Source
AI summary
A separator includes a substrate layer, an inorganic coating, and a bonding layer, where the inorganic coating is disposed between the substrate layer and the bonding layer, and the bonding layer contains a plurality of bonded particles, a surface of each bonded particle containing a plurality of protrusions, an average diameter of the protrusions ranges from 20 nm to 100 nm. The separator provided by this application is conducive to improving the cycle performance, low-temperature performance and rate performance of the electrochemical apparatus.