Lithium Composite Metal Oxide Cathode Additive for Safe Ion Capacitor Doping
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Solution Overview
Problem
Conventional lithium ion capacitors face challenges in controlling lithium doping amounts and ensuring safety during the doping process, particularly when using metal lithium, which limits their scalability and efficiency.
Innovation Solution
A cathode active material is developed using lithium composite metal oxide as a cathode additive, which allows for electrochemical doping of the anode without metal lithium, improving doping efficiency and safety by incorporating lithium composite metal oxides like Li2MoO3 with carbon-based materials, facilitating effective lithium ion transport and intercalation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal lithium is used for lithium doping in conventional lithium ion capacitors, then lithium doping can be achieved, but controlling doping amounts becomes difficult and safety issues arise
Solution Approach 1:
The patent introduces lithium composite metal oxide as an intermediary substance between metal lithium and the carbon-based anode material. This intermediary enables controlled lithium ion release through electrochemical reactions, avoiding the uncontrolled direct contact between metal lithium and the anode, thus achieving precise doping amount control while maintaining safety.
Solution Approach 2:
The patent changes the physical and chemical parameters of the lithium source by using lithium composite metal oxide instead of pure metal lithium. The composite oxide has specific electrochemical properties that allow controlled lithium ion release at predetermined rates, transforming the uncontrolled metal lithium doping process into a controllable electrochemical reaction process.
2Quantity of substance
If metal lithium is used for lithium doping, then lithium supply is available, but the process becomes unsafe and difficult to scale up
Solution Approach 1:
Lithium composite metal oxide serves as a safe intermediary that provides lithium ions through controlled electrochemical reactions. This mediator eliminates the safety hazards associated with handling and processing metal lithium, enabling scalable manufacturing processes while maintaining adequate lithium supply for doping the anode material.
Solution Approach 2:
The patent replaces the mechanical process of metal lithium lamination and short-circuiting with an electrochemical process using lithium composite metal oxide. This substitution eliminates the need for complex mechanical handling and safety precautions, simplifying the manufacturing process and enabling easy scaling to industrial production.
3Quantity of substance
If conventional carbon-based materials are used as cathode active material, then basic capacitor function is achieved, but energy density and output power are limited
Solution Approach 1:
The patent uses composite materials for the cathode, combining carbon-based materials with lithium composite metal oxide. This composite structure leverages the high surface area and conductivity of carbon materials for capacitor function while the lithium composite metal oxide provides additional energy storage capacity and enhances output power through controlled lithium ion release, achieving both high energy density and high power output.
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 use of lithium composite metal oxide as a cathode additive enhances the lithium ion capacitor's energy density, output power, and lifespan while ensuring safe and controlled lithium doping, making it suitable for large-scale use.
Implementation Method 1
a carbon-based material capable of intercalating and extracting lithium ions is used as an anode active material
Implementation Method 2
electrochemical lithium doping is performed by adding a cathode additive having a large initial irreversible capacitance to a carbon-based material
Implementation Method 3
lithium ions having high ionization tendency is pre-doped on the anode to greatly reduce the electrical potential of the anode
Implementation Method 4
electrons are transported to the carbon-based material of the anode and thus the carbon-based material is negatively charged, leading to intercalation of lithium ions into the carbon-based material of the anode
Implementation Method 5
the lithium ion capacitor requires electrochemical adsorption/desorption as well as a lithium doping process for lithium intercalation and extraction
Data Source
AI summary
The present invention relates to a lithium ion capacitor having excellent capacitance characteristics and high energy density. More particularly, the present invention relates to a cathode active material for a lithium ion capacitor, which utilizes a lithium composite metal oxide having a large initial irreversible capacitance as a specific cathode additive in addition to a carbon-based material applied as a cathode active material, and a production method thereof, and a lithium ion capacitor including the same.According to the present invention, lithium can be electrochemically doped on an anode without using metal lithium, and the capacitance characteristics of a lithium ion capacitor and the safety of a lithium-doping process can be significantly improved.