Lithium Battery Electrode Material Complex via Hydrophilic Treatment
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Solution Overview
Problem
Lithium batteries face challenges in maintaining high-energy density and high output over many charge and discharge cycles due to nonuniform mixing of raw materials and resistance differences in active materials, leading to property deterioration.
Innovation Solution
The development of an electrode material for lithium batteries involves hydrophilic treatment of carbon-based conductive materials, combining them with lithium iron phosphate and other active materials using a calcining method in the presence of fluororesin, to form a complex that reduces DC resistance and maintains high-energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode materials and mixing methods are used, then initial energy density can be achieved, but the battery properties deteriorate after repeated charge and discharge cycles due to nonuniform mixing and resistance differences
Solution Approach 1:
The patent changes the physical and chemical parameters of the raw materials by subjecting them to hydrophilic treatment and calcination. This treatment modifies surface properties and enables uniform mixing of materials with different resistances, solving the nonuniform mixing problem while maintaining composition stability during cycling
Solution Approach 2:
The patent creates a composite electrode material system where conductive materials with different resistances are combined through hydrophilic treatment and calcination. This composite structure ensures uniform distribution and stable electrical properties during repeated charge-discharge cycles, resolving the contradiction between initial performance and long-term stability
2Use of energy by moving object
If high-capacity active materials are used to increase specific surface area, then energy density improves, but DC resistance increases and safety deteriorates
Solution Approach 1:
The patent applies local quality improvement by selectively treating the surface of active materials with hydrophilic treatment and calcination. This creates a modified surface layer that reduces DC resistance and improves safety without compromising the high-capacity core material, thus maintaining energy density while resolving reliability issues
Solution Approach 2:
The patent introduces hydrophilic treatment and calcination as intermediary processes between raw material preparation and electrode assembly. These intermediary steps modify surface properties to reduce resistance and improve safety, allowing high-capacity materials to function reliably without directly exposing their problematic characteristics
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 approach results in lithium batteries with low DC resistance, enabling them to maintain high-energy density and output over numerous cycles, preventing capacity and output degradation, and extending battery life.
Implementation Method 1
subjecting a conductive material to hydrophilic treatment
Implementation Method 2
combining them with lithium iron phosphate and other active materials using a calcining method
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention provides an electrode material, for a lithium battery, which is capable of achieving a high-energy density and a high output and continuing its properties for many years, a method of producing the electrode material, and the lithium battery. The electrode material for use in positive and negative electrodes of a lithium battery is formed as a complex by combining a carbon-based conductive material and an electrode active material with each other. The carbon-based conductive material of the electrode material is subjected to hydrophilic treatment by using a gas containing fluorine gas. The electrode material is formed as the complex by calcining a mixture of the carbon-based conductive material subjected to the hydrophilic treatment and the electrode active material in the presence of fluororesin.