Amorphous LiFePO4 All-Solid Battery Eliminates Annealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional all-solid lithium rechargeable batteries require a crystallization step for the positive electrode, which restricts the order of film formation and can lead to internal short-circuiting due to the low melting point of the negative electrode, limiting the integration of a tandem structure and circuit design in electronic devices.
Innovation Solution
The use of LiFePO4 in an amorphous state as the positive electrode, formed at room temperature without heat treatment, allows for flexible film formation order and eliminates the risk of negative electrode melting, enabling the fabrication of tandem structures and various electronic apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is applied to crystallize the positive electrode, then lithium ion mobility is improved, but the negative electrode may melt due to its low melting point
Solution Approach 1:
The positive electrode is formed in a crystalline state before the negative electrode is deposited, eliminating the need for subsequent heat treatment that would expose the negative electrode to melting temperatures. The crystallization step is performed preliminarily on the positive electrode only, avoiding harmful thermal exposure to the negative electrode.
Solution Approach 2:
The manufacturing process is segmented into distinct stages: first forming the crystalline positive electrode, then depositing the negative electrode at room temperature. This segmentation allows the positive electrode to receive heat treatment without affecting the negative electrode, which is sensitive to high temperatures.
2Reliability
If the positive electrode is crystallized before negative electrode formation, then lithium ion mobility is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The positive electrode is crystallized preliminarily before negative electrode deposition, ensuring lithium ion mobility is established early in the process. This preliminary crystallization step is integrated into the manufacturing sequence without requiring additional complex equipment or processes beyond standard thin film deposition and heat treatment capabilities.
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 approach allows for the formation of all-solid rechargeable batteries without the need for annealing, providing sufficient performance and flexibility in circuit design, enabling the integration of batteries with various electronic devices and reducing the risk of internal short-circuiting.
Implementation Method 1
it is considered that these films need to have a crystal structure in order to make it possible for lithium ions to move at the time of charging and discharging
Data Source
AI summary
The present invention relates to an all-solid rechargeable battery, a method for manufacturing the same, and an electronic apparatus, makes the annealing step for crystallization unnecessary in the all-solid rechargeable battery. The present invention includes a substrate, a negative electrode, a solid electrolyte, and a positive electrode, wherein LiFePO4 in an amorphous state is used as the positive electrode.