Carbonaceous Anode Composition for Capacity and Cycling Stability

Solution Overview

Problem

Existing lithium-ion batteries face a trade-off between improving energy density, power density, durability, and safety, with graphite anodes limiting charging speed and cycling stability, especially in automotive and energy storage applications.

Innovation Solution

A composition combining surface-modified carbonaceous particulate materials with high spring-back and lower spring-back graphite enhances cycling performance, durability, and safety while maintaining cell capacity and power density by optimizing electrode properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If graphite anodes are used to improve energy density, then cell capacity increases, but charging speed and cycling stability deteriorate

Engineering Contradiction:

Improvecell capacityVSAvoidcharging speed

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent applies composite materials by combining surface-modified carbonaceous particulate material (with high spring-back ≥20% and BET SSA 4.5-15 m²/g) with unmodified graphite particulate material (with low spring-back <20% and BET SSA ≥5 m²/g) in a composition containing 80-99.9 wt% modified material and 0.1-20 wt% unmodified material. This composite approach allows the electrode to achieve both high capacity and improved charging speed/cycling stability by leveraging the complementary properties of both materials.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If graphite anodes are used to improve energy density, then cell capacity increases, but cycling stability deteriorates

Engineering Contradiction:

Improvecell capacityVSAvoidcycling stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies composite materials by combining surface-modified carbonaceous particulate material (with high spring-back ≥20% and BET SSA 4.5-15 m²/g) with unmodified graphite particulate material (with low spring-back <20% and BET SSA ≥5 m²/g) in a composition containing 80-99.9 wt% modified material and 0.1-20 wt% unmodified material. This composite approach allows the electrode to achieve both high capacity and improved charging speed/cycling stability by leveraging the complementary properties of both materials.

Inventive Principle:

Principle #40Composite materials

3Power

If surface-modified carbonaceous material with high spring-back is used to improve charging speed, then power density increases, but electrode density decreases

Engineering Contradiction:

Improvepower densityVSAvoidelectrode density

Core Design Contradiction:

PowerVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by precisely controlling the BET specific surface area of the surface-modified carbonaceous material within 4.5-15 m²/g and spring-back ≥20%, while also controlling the ratio of modified to unmodified material (80-99.9 wt% modified, 0.1-20 wt% unmodified). This optimization allows achieving high power density while maintaining adequate electrode density.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies composite materials by combining surface-modified carbonaceous particulate material (with high spring-back ≥20% and BET SSA 4.5-15 m²/g) with unmodified graphite particulate material (with low spring-back <20% and BET SSA ≥5 m²/g) in a composition containing 80-99.9 wt% modified material and 0.1-20 wt% unmodified material. This composite approach allows the electrode to achieve both high capacity and improved charging speed/cycling stability by leveraging the complementary properties of both materials.

Inventive Principle:

Principle #40Composite 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 combined carbonaceous materials improve cycling stability, durability, and safety of lithium-ion batteries without sacrificing cell capacity or power density, particularly beneficial for automotive and energy storage applications.

Implementation Method 1

the carbon material is involved in the electrochemical redox process occurring at the electrodes by intercalating and de-intercalating lithium during the charging and discharging process, respectively

Methodology Applied

Scientific EffectIntercalation and de-intercalation of lithium: Absorption (physical)

Data Source

PatentEP3405431B1Carbonaceous materials and methods of use thereof

Publication Date: 2026.02.25 IMERYS GRAPHITE & CARBON SWITZERLAND

AI summary

The present disclosure relates to compositions comprising at least two different carbonaceous components, at least one being a surface-modified carbonaceous particulate material typically having a relatively high spring-back, and at least one other component being a carbonaceous particulate material (such as graphite) generally having a lower spring-back and/or a higher BET specific surface area than the surface-modified carbonaceous material component. Such compositions are particularly useful for making negative electrodes for lithium-ion batteries and the like in view of their beneficial electrochemical properties, particularly in automotive and energy storage applications. The present disclosure also relates to the use of a low-spring-back carbonaceous particulate materials as an additive in carbonaceous compositions, wherein said compositions are used to prepare anodes for Li-ion batteries in order to increase the electrode density, the cell capacity and/or the cycling stability of said battery while maintaining the power density of the cell compared to a cell with an anode absent the carbonaceous additive.