Composite Negative Electrode for Volume-Stable Lithium Batteries
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Solution Overview
Problem
Lithium batteries with metal-based negative electrode active materials face challenges due to high volume change during charging and discharging, leading to poor lifespan characteristics and energy density.
Innovation Solution
A negative electrode with a composite conductive material comprising a carbon-based core and an ion-conductive polymer coating layer, which provides improved lithium ion conduction paths and suppresses volume change, enhancing the battery's energy density and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal-based negative electrode active material is used, then energy density is improved, but volume change during charging and discharging increases leading to poor lifespan characteristics
Solution Approach 1:
The patent applies composite materials by combining metal-based negative electrode active material particles with carbon-based conductive material particles to form a composite structure. This composite material integrates the high energy density advantage of metal-based materials with the structural stability and conductivity of carbon-based materials, thereby improving both energy density and lifespan characteristics simultaneously
Solution Approach 2:
The patent applies local quality by creating a composite structure where carbon-based conductive material is distributed among metal-based active material particles. This local integration provides enhanced conductivity and structural support at specific locations within the electrode, addressing the volume change issue locally while maintaining the overall high energy density of the metal-based material
2Reliability
If carbon-based negative electrode active material is used, then electrochemical stability and volume stability are improved, but unit energy density decreases due to porous structure
Solution Approach 1:
The patent uses composite materials to combine the electrochemical stability of carbon-based materials with the high energy density of metal-based materials. The composite structure allows the carbon component to provide stability while the metal component contributes to energy density, achieving both properties simultaneously
Solution Approach 2:
The patent merges carbon-based conductive material and metal-based active material into a single composite electrode structure. This merging allows the beneficial properties of both materials to work together, with carbon providing stability and conductivity while metal provides high capacity, thereby overcoming the energy density limitation of pure carbon-based electrodes
3Quantity of substance
If metal-based negative electrode active material is used, then energy density is improved, but volume change during charging and discharging causes deterioration
Solution Approach 1:
The patent applies composite materials by integrating metal-based active material with carbon-based conductive material in a composite structure. This composite design allows the carbon component to buffer and accommodate the volume changes of the metal-based material during charging and discharging, thereby maintaining structural integrity while preserving the high energy density advantage
Solution Approach 2:
The patent applies beforehand cushioning by incorporating carbon-based conductive material that acts as a cushioning matrix around metal-based active material particles. This carbon matrix is positioned in advance to accommodate and buffer the volume expansion and contraction of the metal-based material during electrochemical cycling, preventing structural deterioration before it occurs
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 composite conductive material effectively improves lithium ion conductivity and dispersibility, resulting in enhanced energy density and prolonged lifespan of the lithium battery by stabilizing the metal-based negative electrode active material.
Implementation Method 1
the coating layer includes an ion-conductive polymer... effectively provides a conduction path for lithium ions
Implementation Method 2
suppresses a volume change during charging and discharging of a metal-based negative electrode active material
Data Source
AI summary
Provided are a negative electrode and a lithium battery including the same, the negative electrode including: a negative electrode current collector; and a negative electrode active material layer arranged on the negative electrode current collector. The negative electrode active material layer comprises a negative electrode active material and a composite conductive material, wherein the composite conductive material comprises a core and a coating layer, the core comprises a carbon-based conductive material, and the coating layer comprises an ion-conductive polymer.