Electrode Material Moisture Window for Crack-Resistant Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The electrode material containing niobium titanium oxide or titanium dioxide tends to harden and crack when the moisture content is low, leading to defects during processing and reduced energy density, while high moisture content causes binding strength degradation and self-discharge.
Innovation Solution
Maintaining a moisture content of 2000 ppm to 10,000 ppm, as measured by the Karl Fischer method, and using a slurry with carboxymethyl cellulose as a binder to improve flexural strength and prevent cracking, chipping, and peeling, while storing the electrode in an atmosphere with a dew point of 30°C to 50°C to control moisture levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode density is increased to improve energy density, then the energy density is improved, but the mixture layer hardens and cracking occurs
Solution Approach 1:
The patent applies parameter changes by controlling the moisture content of the electrode material within a specific range (2000-10000 ppm) to optimize both density and flexibility. This parameter control allows the electrode to achieve high energy density while preventing the mixture layer from hardening and cracking, directly resolving the technical contradiction between energy density and flexural strength.
2Reliability
If the moisture content is reduced to prevent self-discharge, then self-discharge is minimized, but the electrode material hardens and cracking occurs
Solution Approach 1:
The patent implements parameter changes by establishing an optimal moisture content range (2000-10000 ppm) that simultaneously achieves reliable self-discharge control and maintains adequate flexural strength. This controlled parameter approach prevents the electrode material from hardening and cracking while still minimizing self-discharge, resolving the contradiction between reliability and strength.
3Quantity of substance
If the binder content is reduced to improve density, then the energy density is improved, but the binding property degrades and defects occur
Solution Approach 1:
The patent applies parameter changes by optimizing the moisture content parameter (2000-10000 ppm) to enhance the binding properties of the binder material. This allows the electrode to achieve high energy density with reduced binder content while preventing defects such as powder falling and binding property degradation during processing.
4Quantity of substance
If the electrode material is processed at high density, then the energy density is improved, but cracking and chipping occur during handling
Solution Approach 1:
The patent implements parameter changes by controlling the moisture content within the range of 2000-10000 ppm to maintain optimal flexibility and mechanical integrity. This allows the electrode material to be processed and handled at high density without experiencing cracking, chipping, or peeling defects, thereby resolving the contradiction between energy density and handling integrity.
Data Source
AI summary
In general, according to one embodiment, an electrode material is provided. The electrode material includes at least one of niobium titanium oxide or titanium dioxide. A moisture content measured by a Karl Fischer method is in a range of 2000 ppm or more and 10,000 ppm or less.