Solid-State Battery Laminate With Oxide-Coated Metal Heat Paths
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Solution Overview
Problem
All-solid-state secondary batteries face challenges in uniformly dissipating heat generated from battery reactions, leading to non-uniform internal temperatures and accelerated lithium ion migration, which affects battery performance and cycle characteristics.
Innovation Solution
Incorporating metal particles with an oxide film into the positive electrode, negative electrode, solid electrolyte, and margin layers of the battery, with specific particle size and thickness ranges, to enhance heat dissipation and uniform temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a laminated-type all-solid-state secondary battery is manufactured with multiple layers, then the battery capacity increases, but the heat dissipation uniformity deteriorates due to low thermal conductivity of battery materials
Solution Approach 1:
The patent applies local quality by incorporating metal particles with oxide films specifically at the battery surface and near-surface regions, rather than uniformly throughout the entire battery structure. This localized approach enhances heat dissipation at the surface where heat generation occurs most intensely, without compromising the overall battery capacity provided by the multi-layer laminated structure. The metal particles create high-heat dissipation pathways precisely where needed to address the temperature non-uniformity problem.
Solution Approach 2:
The patent employs composite materials by combining metal particles (such as copper, aluminum, or nickel) with oxide films (such as CuO, Al2O3, or NiO) to create a hybrid thermal management system. The metal core provides high thermal conductivity for efficient heat transfer, while the oxide film layer offers chemical stability and prevents direct contact between the metal and electrolyte. This composite structure optimizes both heat dissipation performance and chemical compatibility within the laminated battery architecture.
2Temperature
If metal particles are added to enhance heat dissipation, then the temperature uniformity improves, but the electron conductivity may deteriorate
Solution Approach 1:
The oxide film serves as an intermediary layer between the metal particle core and the surrounding battery materials. This thin film barrier prevents direct electrical contact between the metal particles and the electrolyte/active materials, thereby maintaining electron conductivity while allowing thermal energy to be conducted through the metal particles. The oxide film acts as a selective mediator that permits heat transfer while blocking electron transport, thus resolving the contradiction between thermal management and electrical 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 achieves uniform heat dissipation and improved lithium ion migration, resulting in enhanced battery performance and cycle characteristics.
Implementation Method 1
the thermal conductivity of a material that constitutes the all-solid-state secondary battery is low, it is difficult to uniformly dissipate heat generated from a battery reaction
Data Source
AI summary
An all-solid-state lithium secondary battery includes a laminated body which has a positive electrode layer including a positive electrode current collector layer and a positive electrode active material layer, a negative electrode layer including a negative electrode current collector layer and a negative electrode active material layer, a solid electrolyte layer containing a solid electrolyte, and a margin layer that is disposed side by side with each of the positive electrode layer and the negative electrode layer and contains a solid electrolyte, in which the positive electrode layer and the negative electrode layer are alternately laminated with the solid electrolyte layer containing the solid electrolyte interposed therebetween, and the laminated body includes metal particles having an oxide film in the positive electrode active material layer, the negative electrode active material layer, the solid electrolyte layer, and the margin layer.