Hybrid Electrode Combining Intercalation and Conversion Materials
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Solution Overview
Problem
Conventional rechargeable batteries, particularly for automotive applications, fail to meet the demands of high power and energy capacity, wide voltage operation range, and mechanical durability, limiting their adoption in electric and hybrid vehicles due to insufficient energy density and power output capabilities.
Innovation Solution
The development of positive electrode compositions for electrochemical cells that combine conversion chemistry active materials and intercalation chemistry active materials, where the intercalation voltage can be above or below the conversion voltage, providing a voltage ceiling or floor respectively, to enhance energy and power performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional rechargeable batteries are used, then they can store and deliver energy, but they fail to provide both high energy density and high power output simultaneously
Solution Approach 1:
The patent combines two different battery chemistries (intercalation and conversion) into a single hybrid electrode system. The intercalation material (e.g., LiCoO2) provides high power output through fast ion transport, while the conversion material (e.g., FeF3) provides high energy density through reversible phase transitions. This merging allows the battery to simultaneously achieve both high energy density and high power output capabilities.
Solution Approach 2:
The patent uses composite electrode materials consisting of intercalation compounds (such as layered oxides) and conversion compounds (such as metal fluorides). This composite structure enables the electrode to exhibit both the fast kinetics of intercalation materials and the high capacity of conversion materials, resolving the contradiction between power and energy density.
2Duration of action of moving object
If conventional batteries are designed for high energy density, then they achieve long range driving, but they lack high instantaneous power output for acceleration and braking
Solution Approach 1:
The hybrid electrode merges the long-duration energy storage capability of conversion materials with the high-power burst capability of intercalation materials. During normal driving, the conversion material supplies energy for extended range, while during acceleration or regenerative braking, the intercalation material delivers or absorbs instantaneous power.
3Power
If conventional batteries are designed for high power output, then they achieve acceleration capability, but they lack sufficient energy density for long range driving
Solution Approach 1:
The composite electrode structure uses intercalation materials optimized for high power delivery and conversion materials optimized for high energy storage. The intercalation component (e.g., LiCoO2 with layered structure) enables fast electron and ion transport for high power, while the conversion component (e.g., FeF3 with high theoretical capacity) provides the energy density needed for extended operation.
4Stability of the object's composition
If the intercalation voltage is above the conversion voltage, then the intercalation chemistry provides a voltage ceiling during recharge, but this requires careful voltage management
Solution Approach 1:
The patent designs the hybrid electrode such that the intercalation and conversion materials operate at different voltage plateaus. The intercalation material with higher voltage serves as a voltage ceiling, preventing overcharging of the conversion material. This voltage stratification simplifies battery management by providing inherent voltage protection without requiring complex control systems.
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 hybrid approach enables electrochemical cells to maintain a stable voltage during high power demands and extended operations, improving the energy density and power output, thus addressing the limitations of conventional batteries for automotive applications.
Implementation Method 1
the intercalation voltage for the intercalation material may be above the conversion voltage for the conversion chemistry material, in which case the intercalation chemistry is utilized during recharge to provide a voltage ceiling
Implementation Method 2
these electrodes include a conversion chemistry active material and an intercalation chemistry active material
Data Source
AI summary
The disclosure set forth herein is directed to battery devices and methods therefor. More specifically, embodiments of the instant disclosure provide a battery electrode that comprises both intercalation chemistry material and conversion chemistry material, which can be used in automotive applications. There are other embodiments as well.