Hybrid Capacitor Positive Electrode with Lithium-Rich Prelithiation

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Solution Overview

Problem

Existing hybrid capacitors face challenges with low energy density, require pre-lithiation of the negative electrode, and are costly, failing to meet the requirements of Internet of Things power supplies in terms of energy density, rate capability, and temperature range.

Innovation Solution

A positive electrode for hybrid capacitors is designed with a bonding layer and a positive electrode material layer on a current collector, incorporating a lithium-rich compound and conductive agents to facilitate lithium intercalation without pre-lithiation, reducing internal resistance and improving energy density and rate capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If pre-lithium intercalation treatment is performed on the negative electrode to improve energy density, then energy density increases, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveenergy densityVSAvoidpre-lithiation process complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent extracts the lithium intercalation function from the negative electrode preparation process and transfers it to the positive electrode material layer by incorporating lithium-rich compounds. This eliminates the need for separate pre-lithiation treatment of the negative electrode, simplifying the overall device structure and manufacturing process while maintaining high energy density.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Lithium-rich compounds are introduced as intermediary materials within the positive electrode material layer. These compounds serve as lithium sources that can provide lithium ions to the negative electrode during initial cycles, effectively performing the pre-lithiation function without requiring external treatment or complex processing steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If activated carbon is used as positive electrode material to simplify manufacturing, then ease of manufacture improves, but energy density deteriorates

Engineering Contradiction:

Improveelectrode preparation simplicityVSAvoidenergy density

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent creates a composite positive electrode material layer that combines activated carbon with lithium-rich compounds. This composite structure maintains the manufacturing simplicity and electrochemical properties of activated carbon while adding the lithium storage capability of lithium-rich compounds, thereby achieving high energy density without complicating the manufacturing process.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent merges the functions of activated carbon (electrochemical energy storage) and lithium-rich compounds (lithium source) into a single positive electrode material layer. This combination allows the electrode to simultaneously provide good electrochemical performance and serve as a lithium source for pre-lithiation, achieving both simplicity and high energy density.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If residual moisture is not removed from activated carbon electrode to reduce processing steps, then ease of manufacture improves, but device performance deteriorates

Engineering Contradiction:

Improvedrying process requirementVSAvoidvoltage and discharge performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent converts the harmful effect of residual moisture (which causes performance degradation) into a beneficial feature by using the moisture as a source of lithium ions. The lithium-rich compounds in the positive electrode material layer can provide lithium ions even in the presence of residual moisture, eliminating the need for extensive drying processes while maintaining or improving device performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 enhances energy density and rate capability, simplifies the production process, and reduces costs, making it suitable for Internet of Things power supplies across a wide temperature range.

Implementation Method 1

incorporating a lithium-rich compound and conductive agents to facilitate lithium intercalation without pre-lithiation

Methodology Applied

Scientific EffectLithium intercalation: Absorption (physical)

Implementation Method 2

incorporating a lithium-rich compound and conductive agents to facilitate lithium intercalation without pre-lithiation, reducing internal resistance

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12417885B2Positive electrode of hybrid capacitor and manufacturing method therefor and use thereof

Publication Date: 2025.09.16 EVE ENERGY CO LTD

AI summary

The present invention relates to a positive electrode of a hybrid capacitor, a manufacturing method therefor and a use thereof. The positive electrode comprises a current collector, and a bonding layer and a positive electrode material layer sequentially located on a surface of the current collector. The bonding layer comprises a first adhesive. The positive electrode material layer comprises a second adhesive, conductive agents, a positive electrode active substance and a lithium-rich compound. The conductive agents comprise a first conductive agent and a second conductive agent. The first conductive agent comprises at least one of graphite powder, conductive carbon black or acetylene black. The second conductive agent comprises at least one of a graphene material and a one-dimensional carbon material.