Halide Solid Electrolyte Battery with Aluminum Oxide Coating
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Solution Overview
Problem
Existing batteries face challenges in reducing internal resistance, which affects their charge/discharge efficiency and overall performance.
Innovation Solution
A battery configuration featuring a positive electrode, a negative electrode, and an electrolyte layer with a first solid electrolyte material composed of Li, M, and X, where M is a metalloid or metal element and X is Cl, Br, or I, and the negative electrode includes a sulfide solid electrolyte to reduce interface resistance and enhance lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a halide solid electrolyte is used in the battery, then lithium ion conductivity is improved, but the electrolyte is reduced at electric potential with regard to Li of not more than 1.5 V, causing instability
Solution Approach 1:
An aluminum oxide coating layer is applied to the surface of the halide solid electrolyte particles. This coating layer acts as an intermediary barrier that prevents direct contact and reduction reactions between the halide electrolyte and electrode materials, while still permitting lithium ion transport. The coating resolves the contradiction by maintaining electrolyte stability without compromising lithium ion conductivity.
2Quantity of substance
If the battery uses solid electrolyte materials, then energy density is improved, but internal resistance increases, reducing charge/discharge efficiency
Solution Approach 1:
The battery employs a dual-electrolyte system combining halide solid electrolyte (Li2.5Y0.5Zr0.5Cl6) with oxide coating (Al2O3), optimizing the chemical composition and physical structure to achieve high lithium ion conductivity while maintaining low internal resistance. The specific stoichiometry and coating thickness are controlled to balance energy density and resistance characteristics.
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 decreases internal resistance, improves charge/discharge efficiency, and stabilizes the halide solid electrolyte, leading to better battery performance and energy storage capabilities.
Implementation Method 1
the first solid electrolyte material includes Li, M, and X... improves charge/discharge efficiency
Implementation Method 2
the negative electrode includes a negative electrode active material and a sulfide solid electrolyte... to reduce interface resistance
Data Source
AI summary
Provided is a battery in which the internal resistance is further decreased. The present disclosure provides a battery, comprising a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. The electrolyte layer includes a first solid electrolyte material. The first solid electrolyte material includes Li, M, and X, and does not include sulfur. M is at least one selected from the group consisting of metalloid elements and metal elements other than Li. X is at least one selected from the group consisting of Cl, Br, and I. The negative electrode includes a negative electrode active material and a sulfide solid electrolyte.