Super-capacitor Electrode Assembly for High Current Lithium Battery
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Solution Overview
Problem
Conventional lithium secondary batteries fail to meet the high energy and output density requirements for high-performance electronic devices such as GSM phones and hybrid vehicles, particularly in terms of initial discharge properties.
Innovation Solution
An electrode assembly incorporating a super-capacitor with high dielectric constant materials, such as HfO2, ZrO2, or TiO2, is integrated into the lithium secondary battery, allowing for high charge/discharge rates by including a super-capacitor electrode layer on the electrode plates and using materials like carbon-based materials or metal oxides, enabling efficient high current supply during startup operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional lithium secondary battery structure is used, then manufacturing simplicity is maintained, but initial discharge properties and output density are insufficient
Solution Approach 1:
The patent combines a super-capacitor unit and a battery unit into a single integrated electrode assembly. The super-capacitor electrode layers are formed on charge collectors that are wound together with battery electrodes and separators, creating a unified structure that delivers both high power (from super-capacitor) and high energy (from battery) without requiring separate components.
Solution Approach 2:
The electrode assembly serves multiple functions: the super-capacitor portion provides high initial discharge current and power delivery, while the battery portion provides sustained energy supply. The integrated structure eliminates the need for separate power delivery systems, making the single electrode assembly universally capable of both high power and high energy operations.
2Productivity
If super-capacitor is integrated into battery, then high charge/discharge rates are achieved, but manufacturing complexity increases
Solution Approach 1:
The electrode assembly is segmented into distinct functional regions: super-capacitor electrode layers with high dielectric constant materials (HfO2, ZrO2, TiO2) are formed on specific portions of charge collectors, while other portions contain battery activation materials. This segmentation allows each region to be optimized for its specific function while maintaining a unified manufacturing process through winding.
Solution Approach 2:
The patent changes material parameters by incorporating high dielectric constant materials (HfO2: 25-40, ZrO2: 20-25, TiO2: 80-100) into the super-capacitor electrode layers. These parameter changes enable the super-capacitor portion to achieve high charge/discharge rates by enhancing capacitance through the superior dielectric properties of these materials.
3Quantity of substance
If high dielectric constant materials are used in super-capacitor, then energy density is improved, but material selection and processing difficulty increase
Solution Approach 1:
The super-capacitor electrode layers are formed as composite structures combining high dielectric constant materials (HfO2, ZrO2, TiO2) with conductive materials and binders. These composite materials maintain high energy storage capacity while providing the necessary electrical conductivity and structural integrity, simplifying processing compared to using pure ceramic dielectric materials.
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 integration of a super-capacitor within the lithium secondary battery enhances its ability to provide high initial discharge currents, addressing the limitations of conventional batteries and supporting the power demands of high-performance electronic devices.
Implementation Method 1
a super-capacitor electrode layer formed on a bare portion of the first or second electrode plate, between the activation layer and the electrode tap
Implementation Method 2
The super-capacitor may be made by adapting materials with high dielectric constants as a separator or as a part of a separator. The electric materials may be HfO2, ZrO2, TiO2 and the like.
Implementation Method 3
a battery using the liquid electrolyte is referred to as a lithium ion battery, and a battery using the polymer electrolyte is referred to as a lithium polymer battery
Data Source
AI summary
An electrode assembly having a super-capacitor for allowing high current charge/discharge operations and a lithium secondary battery having the same. The electrode assembly includes first and second electrode plates, a separator interposed between the first and second electrode plates; and a super-capacitor. Each plate has an electrode charge collector, an activation material layer formed on at least one surface of the electrode charge collector, and an electrode tap attached to the electrode charge collector.