Battery Electrode Additives for Lower Resistance and Faster Charging
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Solution Overview
Problem
Current battery technologies face limitations in electrical conductivity of cathode and anode films, which restricts discharge and charge rates, and ultimately affects power and energy density.
Innovation Solution
The introduction of metal-coated fibers and conductive filamentary structures as additives in the cathode and anode materials to enhance electrical conductivity, thereby reducing resistivity and improving ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional battery materials are used without conductive additives, then the battery structure is simple and manufacturing is easier, but the electrical conductivity is insufficient which limits discharge and charge rates
Solution Approach 1:
The patent applies composite materials by combining conventional battery active materials with conductive additives (metal-coated fibers and conductive filamentary structures) to create a composite electrode material. This composite structure provides both the electrochemical functionality of the active material and the electrical conductivity of the conductive additives, thereby increasing discharge and charge rates without fundamentally changing the battery architecture.
Solution Approach 2:
The conductive additives serve as intermediary elements that facilitate electron transport between the active materials and the current collector. These additives act as a conductive network or pathway that mediates the electrical connection, allowing electrons to move more efficiently through the electrode structure, thus improving charge and discharge rates.
2Power
If the electrical conductivity of cathode and anode films is increased through conductive additives, then power density and energy density improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the electrical conductivity parameter of the electrode films through the addition of conductive additives. By changing the conductivity parameter of the electrode material, the battery achieves higher power density and energy density. The manufacturing complexity increase is accepted as a trade-off for achieving the desired performance improvement in critical parameters.
3Loss of energy
If conventional electrode materials with higher resistivity are used, then the battery design is simpler, but Joule heating increases which reduces efficiency and safety
Solution Approach 1:
The patent converts the harmful effect of electrical resistance into a benefit by introducing conductive additives that specifically target and reduce the resistive losses in the electrode structure. The conductive additives create preferential pathways for electron flow that bypass high-resistance regions, thereby converting the potential harm of resistance into the benefit of reduced Joule heating and improved efficiency.
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
Significant improvements in both power density and energy density are achieved, with lower resistivity leading to faster charging and discharging, increased capacity, and reduced Joule heating, resulting in a more efficient and safer battery.
Implementation Method 1
The introduction of metal-coated fibers and conductive filamentary structures as additives in the cathode and anode materials to enhance electrical conductivity
Implementation Method 2
lower resistivity leading to faster charging and discharging, increased capacity, and reduced Joule heating
Data Source
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AI summary
The electrical resistance of active cathodic and anodic films may be significantly reduced by the addition of small fractions of conductive additives within a battery system. The decrease in resistance in the cathode and/or anode leads to easier electron transport through the battery, resulting in increases in power, capacity and rates while decreasing joules heating losses.