Polymer Electrolyte Electrode Coating for Low-Resistance Solid Batteries
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Solution Overview
Problem
Lithium secondary batteries using polymer electrolytes exhibit lower ion conductivity and interfacial resistance, leading to degraded output and capacity characteristics compared to liquid electrolyte-based batteries, particularly at low temperatures and with limited contact between the solid electrolyte and active material.
Innovation Solution
The electrode is manufactured with a first polymer electrolyte coating layer containing conductive material on electrode active material particles, followed by a second polymer electrolyte covering the first layer, forming an integrated structure through an electrospraying process, which enhances lithium ion conductivity and electron conductivity, allowing for improved capacity and output characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid polymer electrolyte is used to ensure safety and prevent leakage, then reliability is improved, but ion conductivity deteriorates compared to liquid electrolyte
Solution Approach 1:
The patent uses a composite structure combining solid polymer electrolyte with conductive material particles (such as carbon black, graphite, or metal particles) to create an electrode where the solid electrolyte provides safety and reliability while the conductive material network maintains ion conductivity. This composite approach allows the system to achieve both safety and conductivity that would be difficult to obtain with pure solid electrolyte alone.
2Ease of manufacture
If solid electrolyte is used to facilitate thin battery manufacture, then ease of manufacture is improved, but adhesion to active material surface deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different properties: the solid electrolyte provides structural integrity and thin-film capability, while conductive material is locally distributed at the active material surface to enhance adhesion and interfacial contact. This localized distribution of conductive material compensates for the poor adhesion of solid electrolyte without compromising the thin-film advantage.
3Weight of moving object
If solid electrolyte is used to improve energy density, then weight is reduced, but interfacial resistance increases due to lower contact with active material
Solution Approach 1:
The conductive material acts as an intermediary between the solid electrolyte and the active material. It improves interfacial contact and reduces interfacial resistance by providing conductive pathways at the interface, while the solid electrolyte maintains its low-weight advantage for high energy density. The intermediary conductive material bridges the gap between solid electrolyte and active material surfaces.
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 approach effectively increases the reactive sites between the active material and electrolyte, reduces the need for high-pressure pressing, and enhances lithium ion transportability, resulting in improved capacity and energy density while minimizing the amount of conductive material required.
Implementation Method 1
coating the surface of a current collector with the slurry; and (S30) impregnating the product of (S20) with a second polymer electrolyte, wherein step (S20) is carried out by an electrospraying process
Data Source
Figure 1a~1b
Figure 2a~2b
AI summary
The present disclosure relates to a method for manufacturing an electrode for a solid state battery and an electrode obtained thereby. In the electrode, the electrode active material particles are at least partially surface-coated with a first coating layer including a mixture of a first polymer electrolyte and a conductive material. In addition, the first coating layer in the electrode is formed by an electrospraying and/or electrospinning process.