Coated Electrode Material for Halide Solid-State Battery Interfaces
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Solution Overview
Problem
Batteries using halide solid electrolytes face reduced charge/discharge efficiency due to side reactions and the formation of oxidized or reduced layers, which impede lithium ion conductivity and increase interface resistance.
Innovation Solution
Incorporating a coating material on the surface of electrode active materials to prevent electron extraction or insertion by the halide solid electrolyte, thereby suppressing side reactions and enhancing ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halide solid electrolyte is used in battery, then battery can be constructed with solid electrolyte, but charge/discharge efficiency is reduced due to side reactions and formation of oxidized or reduced layers
Solution Approach 1:
A coating layer is introduced as an intermediary between the halide solid electrolyte and the electrode active material. This coating layer prevents direct contact and harmful side reactions while allowing lithium ion transport, thus resolving the contradiction between enabling battery construction and maintaining charge/discharge efficiency.
Solution Approach 2:
The coating layer is applied in advance to the electrode active material surface before assembling the battery. This preliminary protective action prevents the formation of oxidized or reduced layers that would otherwise occur during battery operation, thereby preserving charge/discharge efficiency from the outset.
2Loss of energy
If coating material is added on electrode active material surface, then charge/discharge efficiency is improved by suppressing side reactions, but device structure becomes more complex
Solution Approach 1:
A thin film coating layer is applied on the electrode active material surface. This thin film structure provides the necessary protective function to suppress side reactions and improve charge/discharge efficiency while minimizing the increase in device complexity and maintaining structural simplicity.
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 coating material improves charge/discharge efficiency by reducing side reactions and enhancing lithium ion conductivity, leading to better battery performance and energy density.
Implementation Method 1
the coating material is located on the surface of the electrode active material... to prevent electron extraction or insertion by the halide solid electrolyte
Implementation Method 2
the first solid electrolyte material includes Li, M, and X... enhancing ion conductivity
Data Source
AI summary
An electrode material includes an electrode active material, a first solid electrolyte material, and a coating material. The first solid electrolyte material includes Li, M, and X and does not include sulfur, where M includes at least one selected from the group consisting of metal elements other than Li and metalloid elements, and X is at least one selected from the group consisting of Cl, Br, and I. The coating material is located on the surface of the electrode active material.