Composite Solid Electrolyte Layer for Dendrite-Resistant Batteries
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Solution Overview
Problem
Existing all-solid-state secondary batteries face issues with short circuits caused by dendrite formation, particularly in high-temperature environments, which can lead to safety risks.
Innovation Solution
A solid electrolyte-containing layer comprising an inorganic solid electrolyte, a heat-resistant resin, and optionally an ionic liquid, a mixture of an ionic liquid and a lithium salt, or a polymer electrolyte, with a glass-transition temperature above 200°C, is used to prevent dendrite growth and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic solid electrolyte is used in an all-solid-state secondary battery, then ion conductivity is improved, but dendrite formation occurs leading to short circuits between electrodes
Solution Approach 1:
The patent applies composite materials by combining inorganic solid electrolyte particles with organic electrolyte in a specific ratio (inorganic solid electrolyte: organic electrolyte = 3:7 to 7:3 by weight). This composite structure allows the inorganic solid electrolyte to provide high ion conductivity while the organic electrolyte fills gaps and prevents dendrite formation, resolving the contradiction between improved ion conductivity and dendrite prevention
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte system by controlling the particle size distribution of inorganic solid electrolyte (D10: 0.1-10 μm, D50: 1-20 μm, D90: 10-50 μm) and the ratio of inorganic to organic electrolyte components. These parameter optimizations enable the composite electrolyte to achieve both high ion conductivity and effective dendrite suppression
2Productivity
If a solid electrolyte layer is made thinner to reduce battery size, then energy density is improved, but the risk of short circuits increases
Solution Approach 1:
The composite electrolyte structure maintains effective dendrite blocking capability even at reduced thickness because the organic electrolyte fills the interstitial spaces between inorganic solid electrolyte particles, creating a continuous protective matrix that prevents dendrite penetration throughout the entire thickness of the layer
Solution Approach 2:
The patent utilizes the porous structure formed by inorganic solid electrolyte particles with controlled size distribution, where the pores are filled with organic electrolyte. This porous composite structure provides both mechanical integrity for short circuit prevention and sufficient ion conduction pathways, enabling thin-layer design without compromising safety
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 proposed layer enhances ion conductivity and prevents short circuits, ensuring the safety and stability of all-solid-state secondary batteries even in high-temperature conditions.
Implementation Method 1
the heat-resistant resin has a glass-transition temperature of not less than 200° C.
Implementation Method 2
an inorganic solid electrolyte
Data Source
AI summary
Provided is a solid electrolyte-containing layer capable of preventing a short circuit caused by the formation of a dendrite. A solid electrolyte-containing layers (30) in accordance with an aspect of the present invention includes (i) an inorganic solid electrolyte (31), (ii) a heat-resistant resin (32), and (iii) at least one selected from the group consisting of an ionic liquid, a mixture of an ionic liquid and a lithium salt, and a polymer electrolyte.