Li-Ion Battery Electrode Interlayer for High-Density Electrolyte Permeation
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Solution Overview
Problem
Lithium ion secondary batteries face issues with reduced energy density and increased resistance due to high electrode density, which affects their performance and durability, particularly in applications requiring high energy storage like BEVs and PHEVs.
Innovation Solution
Incorporating an electroconductive layer with solid electrolyte particles and electroconductive particles between the current collector and the electrode active material layer, forming a solid electrolyte-electroconductive particle complex, which enhances electrolyte solution permeability and retention, maintaining electrical conductivity and preventing oxide coating film formation on the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density of the electrode is increased to attain high energy density, then the energy density is improved, but the impregnation property of the electrolyte solution is reduced
Solution Approach 1:
A coating film containing a specific compound is applied to the current collector surface to act as an intermediary layer. This coating film facilitates electrolyte solution penetration while accommodating the high packing density of the active material, thereby resolving the contradiction between high energy density and good impregnation property
Solution Approach 2:
The coating film on the current collector is designed with porous structure or specific morphology that allows electrolyte solution to penetrate through the dense electrode structure, enabling both high packing factor and adequate electrolyte impregnation
2Quantity of substance
If the density of the electrode is increased to attain high energy density, then the energy density is improved, but the time required for electrode production is increased
Solution Approach 1:
The coating film is pre-formed on the current collector before the active material is applied. This preliminary action creates a ready-made pathway for electrolyte penetration, reducing the time needed for subsequent electrolyte impregnation and electrode formation processes
3Quantity of substance
If the density of the electrode is increased to attain high energy density, then the energy density is improved, but voltage variance during aging occurs and durability deteriorates
Solution Approach 1:
The coating film on the current collector serves as a protective intermediary that ensures uniform electrolyte distribution and stable electrical contact, reducing voltage variance during aging and improving the durability of high-density electrodes
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
This configuration increases the volume energy density of the battery, improves charge and discharge characteristics, and extends cycle life by maintaining high output and reducing resistance, even at high packing densities, thus addressing the challenges of reduced output and capacity degradation.
Implementation Method 1
the electrode includes an electroconductive layer containing solid electrolyte particles and electroconductive particles, between the current collector and the electrode active material layer
Implementation Method 2
when an electrolyte salt is disposed in the vicinity of a current collector in an electrode for a lithium ion secondary battery, a fluoride-based coating film is formed on the surface of the current collector and thereby the formation of an oxide coating film on the current collector is suppressed
Implementation Method 3
the electrode includes an electroconductive layer containing solid electrolyte particles and electroconductive particles
Data Source
AI summary
Provided are an electrode for a lithium ion secondary battery, and a lithium ion secondary battery, in which a reduction in the permeability of an electrolyte solution and an increase in resistance even when the density of the electrode is increased, can be suppressed.In the electrode for a lithium ion secondary battery, a layer in which the diffusion rate of an electrolyte solution is greater than in an active material layer is disposed between a current collector and an active material layer.Specifically, the electrode for a lithium ion secondary battery includes a current collector, and an electrode active material layer containing an electrode active material, the electrode active material layer being formed on at least one side of the current collector, in which an electroconductive layer containing solid electrolyte particles and electroconductive particles is disposed between the current collector and the electrode active material layer.