Lithium-Ion Battery Functional Coatings for Slippage Control
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Solution Overview
Problem
Lithium-ion batteries face challenges with stability and safety due to relative slippage between the lithium-supplementing layer and the separator, electrode plate expansion leading to potential thermal runaway, and insufficient electrolyte infiltration, which affects energy density and cycle performance.
Innovation Solution
A lithium-ion battery design featuring a negative electrode plate with a smooth lithium-supplementing layer and a first functional coating, a separator with a second functional coating, and an inorganic coating between the separator and the second functional coating, utilizing organic porous particulate materials with specific compressibility and surface functional groups to enhance interaction force, mitigate slippage, and improve electrolyte infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth lithium foil is used as the lithium-supplementing layer, then the energy density and cycle performance are enhanced, but relative slippage occurs between the lithium-supplementing layer and the separator, affecting battery stability
Solution Approach 1:
The patent applies composite materials by combining the smooth lithium foil with a functional coating layer containing organic porous particulate materials. This composite structure maintains the high energy density benefits of the smooth lithium surface while adding mechanical interlocking capability through the porous particles, preventing slippage between the lithium layer and separator.
Solution Approach 2:
The patent utilizes porous materials by incorporating organic porous particulate materials into the functional coating layer. These porous particles create mechanical interlocking with both the lithium foil and the separator, preventing relative slippage while maintaining the smooth surface of the lithium layer for high energy density.
2Strength
If the strength of the current collector is increased to solve electrode plate expansion, then the electrode plate expansion problem is addressed, but the elongation of the current collector deteriorates
Solution Approach 1:
The patent applies this principle by using a functional coating layer with porous particulate materials that provides flexibility and compression capability. This coating layer acts as a buffer that can compress during electrode expansion, accommodating the expansion without requiring excessive strength from the current collector, thereby maintaining both strength and elongation.
3Stability of the object's composition
If a functional coating with organic porous particulate material is applied to increase interaction force and suppress slippage, then the stability is enhanced, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the functional coating layer to simultaneously achieve multiple objectives: preventing slippage through mechanical interlocking, accommodating electrode expansion through compression, and enhancing electrolyte infiltration through the porous structure. This single multi-functional layer reduces the need for multiple separate components, thereby limiting the increase in device complexity.
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 design increases stability and safety by reducing slippage, accommodating electrode expansion, and enhancing electrolyte infiltration, leading to improved energy density, cycle performance, and lithium utilization, while preventing thermal risks and ensuring effective heat dissipation.
Implementation Method 1
the organic porous particulate material contained in the first functional coating and the second functional coating can absorb the electrolytic solution, and improve an infiltration effect of the lithium-supplementing layer
Implementation Method 2
The organic porous particulate material contained in the first functional coating and the second functional coating can increase a reserved gap between the lithium-supplementing layer of the electrode plate and the separator
Data Source
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AI summary
This application provides a lithium-ion battery and a device. The lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator located between the positive electrode plate and the negative electrode plate, and an electrolytic solution. A lithium-supplementing layer and a first functional coating are sequentially disposed on a surface of the negative electrode plate, the surface being close to the separator. A second functional coating is disposed on a surface of the separator, the surface being close to the negative electrode plate. Both the first functional coating and the second functional coating contain an organic porous particulate material. In the lithium-ion battery provided in this application, the first functional coating and the second functional coating are added to enhance stability of the lithium-ion battery, improve safety of the lithium-ion battery, and effectively improve cycle performance of the lithium-ion battery.