Solid-State Battery Using Olivine Phosphate Electrodes
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Solution Overview
Problem
Solid-state rechargeable batteries face limitations in discharge capacity and operating potential, which hinder their broader application in various devices.
Innovation Solution
The use of phosphate materials with an olivine crystal structure, containing transition metals like Co, Mn, and Fe, in electrode layers, along with a solid electrolyte layer, enhances discharge capacity and operating potential by forming a solid solution with negative electrode active materials, and ensures robustness against polarity reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional solid-state battery structures are used, then the battery structure is simple, but the discharge capacity and operating potential are limited
Solution Approach 1:
The battery is divided into multiple electrode layers (positive and negative electrodes) with solid electrolyte layers interposed between them. This multilayer segmentation allows for increased discharge capacity while maintaining a manageable structural complexity through systematic arrangement of functional layers.
Solution Approach 2:
The patent employs composite materials including phosphates with olivine crystal structure containing transition metals (Co, Mn, Fe) in the electrode layers, combined with solid electrolyte materials. This composite material approach enhances both discharge capacity and operating potential while providing structural stability.
2Quantity of substance
If phosphate materials with transition metals are used in electrode layers, then discharge capacity and operating potential increase, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes controlled firing processes at specific temperature ranges to synthesize the phosphate materials with olivine crystal structure. By optimizing firing temperature and atmosphere parameters, the manufacturing process achieves the desired material properties while maintaining practical ease of manufacture.
3Quantity of substance
If multilayer structure is employed, then energy density increases, but manufacturing precision requirements increase
Solution Approach 1:
The battery structure is segmented into multiple thin layers of positive electrodes, solid electrolytes, and negative electrodes. This segmentation enables high energy density through increased active material content while the systematic layering approach provides manufacturing tolerances that balance precision requirements with production feasibility.
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 configuration significantly increases discharge capacity and operating potential, ensuring reliable battery performance and practical usability even with unintentional polarity connection, while maintaining cost-effectiveness through controlled firing processes.
Implementation Method 1
The use of phosphate materials with an olivine crystal structure, containing transition metals like Co, Mn, and Fe, in electrode layers, along with a solid electrolyte layer, enhances discharge capacity and operating potential by forming a solid solution with negative electrode active materials
Data Source
AI summary
A solid-state rechargeable battery includes a pair of electrode layers and a solid electrolyte layer interposed between the pair of electrode layers. The pair of electrode layers each includes a phosphate having an olivine crystal structure. The phosphate contains a transition metal and lithium.