Battery Separator Coating and Electrolyte for Better Li-Ion Infiltration
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Solution Overview
Problem
Existing lithium-ion batteries face challenges in balancing kinetic performance and storage performance, leading to poor overall efficiency and reliability.
Innovation Solution
The electrochemical apparatus includes a separator with a substrate and a first coating containing polymer particles, and an electrolyte with substituted or unsubstituted C3-C8 linear carboxylate, which together enhance adhesivity, wettability, and infiltration performance, thereby improving lithium ion transport and balancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator uses conventional coating materials and electrolyte compositions, then the manufacturing process is simple, but the interface contact between separator and electrode plates is poor and lithium ion transport rate is low
Solution Approach 1:
The separator employs a composite coating structure consisting of a first coating layer containing polymer particles and a second coating layer containing inorganic particles on the first coating layer. This multi-layer composite structure improves interface contact quality and lithium ion transport rate while maintaining manufacturing feasibility through established coating processes.
Solution Approach 2:
The separator utilizes porous substrate material with controlled porosity to facilitate lithium ion transport. The porous structure of the substrate combined with the coating layers creates optimized ion circulation channels, improving transport rate without significantly complicating the manufacturing process.
2Reliability
If the electrolyte uses conventional compositions, then the electrolyte formulation is simple, but the infiltration performance on separator and electrode plates is insufficient
Solution Approach 1:
The electrolyte composition is optimized by adjusting the proportions of cyclic carbonate and chain carbonate solvents, along with adding specific additives. This parameter optimization improves infiltration performance on the separator and electrode plates while maintaining a relatively simple electrolyte formulation that uses conventional components.
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 described configuration enhances the interface contact and infiltration performance of the electrochemical apparatus, leading to improved kinetic and storage performance, ensuring efficient lithium ion transport and maintaining battery health.
Implementation Method 1
the separator has high adhesivity, allowing for good interface contact between the separator and the positive electrode plate as well as between the separator and the negative electrode plate
Implementation Method 2
the separator has good wettability and the electrolyte has good infiltration performance, increasing a quantity of lithium ion circulation channels
Data Source
Figure 1~2
Figure 3
AI summary
An electrochemical apparatus includes an electrolyte, a positive electrode plate, a negative electrode plate, and a separator. The separator is disposed between the positive electrode plate and the negative electrode plate. The separator includes a substrate and a first coating provided on both surfaces of the substrate. The first coating includes polymer particles. In an 11.5 µm × 7.5 µm region of a surface of the first coating, a quantity Q of the polymer particles is 10 to 90. The electrolyte includes substituted or unsubstituted C3-C8 linear carboxylate, and in a case of substitution, a substituent group is selected from halogen atoms. A mass percentage B of the linear carboxylate is 5% to 50% based on a mass of the electrolyte.