Sintered Lithium Battery Plate With Metal Oxide Delamination Barrier
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Solution Overview
Problem
Lithium secondary batteries using integrated sintered plates for positive and negative electrodes suffer from delamination during assembly and capacity deterioration due to metal diffusion when stored in a charged state, limiting their high capacity and charge/discharge efficiency.
Innovation Solution
A lithium secondary battery design where a positive electrode layer, ceramic separator, and negative electrode layer form an integrated sintered plate, coated with a metal oxide layer to enhance bond strength and prevent delamination and capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integrated sintered plate design is used to minimize layer displacement and improve battery performance, then discharge capacity and charge/discharge cycle performance are improved, but the layers are prone to delamination during assembly due to weak bond strength
Solution Approach 1:
A metal oxide layer is introduced as an intermediary coating between the positive electrode layer, ceramic separator, and negative electrode layer. This metal oxide layer serves as a bonding mediator that enhances the bond strength between the different layers, preventing delamination during assembly while maintaining the integrated sintered plate structure's high discharge capacity and charge/discharge cycle performance.
Solution Approach 2:
The patent creates a composite structure by coating the integrated sintered plate with a metal oxide layer. This composite approach combines the advantages of the integrated sintered plate design (high discharge capacity, excellent charge/discharge cycle performance) with the bonding benefits of the metal oxide coating, resulting in a multi-layer structure that resists delamination while maintaining high performance.
2Ease of manufacture
If the positive electrode layer and negative electrode layer are directly bonded without additional coating, then the structure is simpler and manufacturing is easier, but metal diffusion occurs during charged state storage causing capacity deterioration
Solution Approach 1:
The metal oxide layer acts as a diffusion barrier and intermediary protective coating between the positive electrode layer and negative electrode layer. This coating prevents direct contact between the electrodes during charged state storage, blocking metal diffusion pathways and preventing capacity deterioration while adding minimal manufacturing complexity to the integrated sintered plate structure.
Data Source
AI summary
Provided is a lithium secondary battery including a positive electrode layer composed of a lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed between the positive electrode layer and the negative electrode layer, an electrolyte with which at least the ceramic separator is impregnated, and an exterior body including a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolyte. The positive electrode layer, the ceramic separator, and the negative electrode layer form one integrated sintered plate as a whole, and the entirety of the integrated sintered plate is coated with a metal oxide layer.