Composite Modified Layer for Solid-State Battery Interphase
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Solution Overview
Problem
Conventional solid-state lithium-ion batteries face high interphase resistance and reduced cycle performance due to cracks between inorganic ceramic conductors and lithium-containing oxides, limiting their high-rate discharge ability and lifespan.
Innovation Solution
A positive electrode material with a modified layer composed of an organic/inorganic composite material, formed by combining an ionic conductive ceramic compound and an organic conductive compound via a coupling agent, which encapsulates the active particle and reduces crack propagation, enhancing ion and electron conductivity and forming a stable solid electrolyte interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic ceramic conductor is used to improve ionic conductivity, then ionic conductivity is improved, but cracks occur between inorganic ceramic conductor and lithium-containing oxide, reducing cycle performance and high-rate discharge ability
Solution Approach 1:
The patent applies composite materials by combining inorganic ceramic conductor particles with organic conductive polymer matrix to form a composite coating layer. This composite structure allows the inorganic ceramic to provide ionic conductivity while the organic polymer provides flexibility and adhesion, preventing crack formation at interfaces and resolving the contradiction between improving ionic conductivity and maintaining structural integrity.
2Object-affected harmful factors
If solid-state electrolyte is used to improve safety, then safety is improved, but high interphase resistance occurs between electrode and solid-state electrolyte, limiting performance
Solution Approach 1:
The patent uses a composite coating layer comprising inorganic ceramic conductor and organic conductive polymer as an intermediary between the electrode and solid-state electrolyte. This intermediate layer reduces interphase resistance by providing compatible interfaces for both ionic and electronic conduction, while maintaining the safety benefits of solid-state electrolyte, thus resolving the contradiction between safety and performance.
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 solution reduces interphase resistance, improves high-rate discharge ability, and extends the battery's lifespan by preventing crack formation and enhancing the safety of lithium-ion batteries with high nickel content.
Implementation Method 1
a modified layer which is a reaction product of a composition, wherein the composition may include an inorganic ceramic compound, an organic conductive compound, and a coupling agent
Implementation Method 2
the inorganic ceramic compound may be an ionic conductive ceramic compound
Implementation Method 3
the organic conductive compound may be an organic conductive compound
Data Source
AI summary
A positive electrode material, a positive electrode, and a battery employing the same are provided. The positive electrode material includes an active particle and a modified layer covering the surface of the active particle. The modified layer is a reaction product of a composition. The composition includes an ionic conductive ceramic compound, an organic conductive compound, and a coupling agent. In the disclosure, the ionic conductive ceramic compound is 50-84 parts by weight, the organic conductive compound is 16-50 parts by weight, and the total weight of the ionic conductive ceramic compound and the organic conductive compound is 100 parts by weight. In the disclosure, the weight percentage of the coupling agent is from 0.05 wt % to 10 wt %, based on the total weight of the ionic conductive ceramic compound and the organic conductive compound.