DLH Composite Electrodes for Fast-Charging High-Power Energy Storage
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Solution Overview
Problem
Existing rechargeable lithium-ion batteries face environmental unfriendliness, high cost due to lithium rarity, long charging times, and limitations in discharge velocity, especially in lithium iron phosphate batteries, which also suffer from decreased discharge velocity beyond 80% capacity.
Innovation Solution
A double layered hydroxide (DLH)-type compound, such as NiII8(1-x)NiIII8xO16H2(9-4x)CO3, is used as the second electrode in energy storage devices, paired with a FeII-FeIII DLH-type compound, utilizing a CO32−/HCO3− buffer electrolyte at pH 8-12, and combined with graphite and resin to form composite electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If lithium-ion batteries are used, then energy storage capacity is achieved, but charging time is long and discharge velocity is limited
Solution Approach 1:
The patent changes the chemical parameters of the electrode materials by using DLH-type compounds with specific cation compositions (divalent and trivalent metals in defined ratios) and intercalated anions, which fundamentally alters the charge-discharge mechanism to enable faster kinetics compared to conventional lithium-ion materials
Solution Approach 2:
The patent employs composite electrode structures combining DLH-type compounds with conductive materials and binders, creating a composite material system that enhances both charging speed and discharge velocity while maintaining structural integrity during rapid charge-discharge cycles
2Reliability
If lithium iron phosphate is used, then battery stability is improved, but discharge velocity decreases beyond 80% capacity
Solution Approach 1:
The patent modifies the electrochemical parameters by using DLH-type compounds that operate at different voltage plateaus and utilize proton insertion/extraction mechanisms instead of lithium ion diffusion, enabling maintained discharge velocity across the full capacity range without the 80% limitation observed in lithium iron phosphate systems
Solution Approach 2:
The patent extracts the lithium component from the electrode materials and replaces it with DLH-type compounds containing divalent and trivalent metal cations, thereby eliminating the discharge velocity limitation inherent to lithium iron phosphate while retaining structural stability
3Ease of manufacture
If conventional electrode materials are used, then manufacturing is established, but environmental impact is high and cost is high due to lithium rarity
Solution Approach 1:
The patent replaces expensive and environmentally concerning lithium-based materials with abundant, cheaper DLH-type compound materials that can be synthesized from common metal salts, reducing both material cost and environmental footprint while maintaining functional performance
Solution Approach 2:
The patent changes the material composition parameters from lithium-based to DLH-type compounds with divalent and trivalent metals, which can be produced through more environmentally friendly synthesis routes using aqueous precipitation methods, thereby reducing environmental impact while maintaining ease of manufacture
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 provides a stable, high-power energy storage device with improved discharge velocity and reduced environmental impact, avoiding lithium-related drawbacks and enabling faster charging, while maintaining mechanical strength and suitability for various applications.
Implementation Method 1
all water molecules present in these materials do not play any role in the deprotonation-protonation process (described below), and the number of water molecules present is therefore not relevant to the functioning of the materials in their use as electrodes
Data Source
AI summary
The present disclosure relates to double layered hydroxide-type compounds comprising both di- and tri-valent nickel ions, and the use of such compounds in electrodes for energy storage device in addition to a previously developed electrode using Fe2+ and Fe3+“green rusts related compounds”.