Doped Conversion Cathode Materials for Battery Energy Density
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Solution Overview
Problem
Current lithium-ion secondary batteries face limitations in electrical and ionic conductivity, life-cycle stability, and power delivery due to certain conversion materials used in their positive electrodes.
Innovation Solution
Development of doped conversion material compositions for secondary battery cathodes, specifically using dopants like oxygen, carbon, and certain metals to enhance electrical and ionic conductivity, energy density, and power delivery, suitable for use with solid state electrolytes such as sulfide-based and lithium-stuffed-garnet-based electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conversion materials are used in secondary battery cathodes, then energy density is improved, but electrical and ionic conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the dopant composition, concentration, and type in conversion materials. By adjusting these parameters, the material achieves optimized electrical and ionic conductivity while preserving high energy density characteristics.
Solution Approach 2:
The patent employs composite materials by combining conversion materials with dopants to create doped conversion materials. This composite structure integrates the high energy density of conversion materials with the enhanced conductivity properties of dopants, resolving the contradiction between energy density and conductivity.
2Use of energy by moving object
If conversion materials are used in secondary battery cathodes, then energy density is improved, but life-cycle stability deteriorates
Solution Approach 1:
The patent utilizes parameter changes by optimizing dopant concentration and composition to enhance the structural stability and electrochemical performance of conversion materials over extended cycling, thereby improving life-cycle stability while maintaining energy density.
Solution Approach 2:
The patent applies composite materials by integrating dopants into conversion material structures, creating doped conversion materials that exhibit improved structural integrity and electrochemical stability over multiple charge-discharge cycles, thus enhancing life-cycle stability.
3Use of energy by moving object
If conversion materials are used in secondary battery cathodes, then energy density is improved, but power delivery deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting dopant composition and concentration to optimize the electrical conductivity of conversion materials, enabling faster charge transfer and improved power delivery while preserving high energy density characteristics.
Solution Approach 2:
The patent employs composite materials by combining conversion materials with conductive dopants, creating doped conversion materials that exhibit enhanced electrical conductivity and power delivery capability while maintaining the high energy density of the original conversion materials.
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 doped conversion materials significantly improve the electrical and ionic conductivity, energy density, and power delivery of secondary batteries, maintaining high performance over multiple charge-discharge cycles, thereby addressing the limitations of existing materials.
Implementation Method 1
a conversion chemistry material having a dopant, wherein the dopant is present in the conversion chemistry material in an amount from about 0.01% to 25% (atomic %)
Implementation Method 2
rechargeable lithium ion batteries, i.e., Li-secondary batteries, in which lithium ions move from a negative electrode to the positive electrode during discharge of the battery
Data Source
AI summary
Battery systems using doped conversion materials as the active material in battery cathodes are provided herein. Doped conversion material may include a defect-rich structure or an amorphous or glassy structure, including at least one or more of a metal material, one or more oxidizing species, a reducing cation species, and a dopant. Methods for fabricating batteries and battery systems with doped conversion material are also provided herein.