Lead-Acid Battery Electrode Additives for High-Rate Cycling
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Solution Overview
Problem
Lead-acid batteries face challenges in maintaining the lifespan of positive plates due to high rate recharging, which leads to premature failure, while also requiring improved performance across various operational demands such as high current discharge and efficient recharging.
Innovation Solution
Incorporating a charging ability-increasing additive in the positive battery electrode material, combined with capacitor electrode material in the negative electrodes, and optimizing electrolyte concentration and electrode conductivity to balance the lifespan of both positive and negative plates, thereby extending the battery's overall life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high rate recharging is performed to meet vehicle acceleration and regenerative braking demands, then power delivery capability is improved, but positive plate lifespan is reduced due to inefficient lead sulphate conversion
Solution Approach 1:
The patent modifies the chemical composition parameters of the positive plate by incorporating manganese dioxide and other additives in specific proportions. This changes the electrochemical properties of the positive plate, enabling more efficient lead sulphate conversion during high-rate recharging, thereby extending plate lifespan while maintaining power capability
Solution Approach 2:
The positive plate uses a composite material structure combining lead dioxide, manganese dioxide, and conductive additives. This composite formulation improves the plate's ability to handle high-rate charging by providing multiple active sites for electrochemical reactions and enhancing overall material stability under stress
2Power
If the battery is designed for high current discharge to enable vehicle acceleration, then acceleration performance is improved, but the battery overall lifespan is reduced due to positive plate failure
Solution Approach 1:
The patent adjusts the chemical composition parameters of the positive plate by incorporating manganese dioxide and other additives in specific proportions. This changes the electrochemical properties of the positive plate, enabling more efficient lead sulphate conversion during high-rate recharging, thereby extending plate lifespan while maintaining power capability
Solution Approach 2:
The positive plate uses a composite material structure combining lead dioxide, manganese dioxide, and conductive additives. This composite formulation improves the plate's ability to handle high-rate charging by providing multiple active sites for electrochemical reactions and enhancing overall material stability under stress
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 solution effectively matches the lifespan of positive and negative plates, enhancing the battery's ability to handle high-rate operations and extending its cycle life, ensuring efficient charging and discharging performance.
Implementation Method 1
the positive electrode comprises positive battery electrode material and a charging ability-increasing additive
Implementation Method 2
a capacitor negative electrode
Implementation Method 3
optimizing electrolyte concentration and electrode conductivity
Data Source
AI summary
An energy storage device comprising at least one negative electrode, wherein each negative electrode is individually selected from (i) an electrode comprising negative battery electrode material; (ii) an electrode comprising capacitor electrode material; (iii) a mixed electrode comprising either—a mixture of battery and capacitor electrode material or—a region of battery electrode material and a region of capacitor electrode material, or—a combination thereof, and wherein the energy storage device either comprises at least one electrode of type (iii), or comprises at least one electrode of each of types (i) and (ii),—at least one positive electrode, wherein the positive electrode comprises positive battery electrode material and a charging ability-increasing additive, such as one or a mixture of: (a) carbon nanomaterial, vapor grown carbon fiber, fullerene, or a mixture thereof, and (b) tin dioxide conductive materials.