Modified Graphite Negative Electrode Material for Secondary Batteries
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Solution Overview
Problem
The challenge in developing high-energy density secondary batteries lies in achieving higher compaction density of negative electrodes without compromising kinetic and cycle performance, as increased density leads to difficulties in electrolyte infiltration, polarization, and lithium precipitation.
Innovation Solution
A modified graphite negative electrode material is created by incorporating multilayer graphene loaded with a conductive agent and a binder, which improves conductivity, electrolyte infiltration, and reduces friction between graphite particles, thereby enhancing compaction density and preventing lithium precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compaction density of the negative electrode is increased to improve energy density, then the energy density of the secondary battery is improved, but the electrolyte infiltration becomes difficult and lithium precipitation occurs
Solution Approach 1:
The patent introduces a surface-modified graphite particle as an intermediary between the graphite and electrolyte interface. This modified particle with optimized surface properties mediates the interaction between lithium ions and the electrode, preventing direct harmful contact that causes precipitation while maintaining efficient ion transport for high energy density
Solution Approach 2:
The patent changes the surface parameters of graphite particles through chemical modification or coating, altering surface energy, porosity, or functional groups. This parameter change improves electrolyte wetting and lithium ion diffusion at high compaction density, preventing precipitation while maintaining high energy density
2Use of energy by moving object
If the compaction density of graphite is increased to improve energy density, then the energy density is improved, but the interface between the negative electrode and electrolyte deteriorates
Solution Approach 1:
The patent modifies surface parameters of graphite particles including surface area, porosity, or chemical composition through controlled treatment. This creates an optimized interface that maintains reliable electrolyte contact even at high compaction densities, ensuring stable electrochemical performance
Solution Approach 2:
The patent creates a composite structure where graphite particles are combined with surface modifiers or coatings that enhance interface quality. This composite approach maintains both high compaction density for energy density and reliable electrolyte interaction for stable performance
3Power
If simple mixing of graphene and graphite is used to improve conductivity, then the electrical conductivity is improved, but the consistency of the secondary battery becomes poor
Solution Approach 1:
The patent merges graphene and graphite into a unified composite material where graphene is integrated within or on the graphite structure. This merging ensures uniform distribution of conductive phases, maintaining consistent electrical conductivity and battery performance across production batches
Solution Approach 2:
The patent controls the concentration, size, or distribution parameters of graphene in the graphite matrix through precise formulation and processing. This parameter control ensures reproducible mixing results and consistent battery performance while achieving the desired conductivity enhancement
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 modified material achieves higher compaction density and improved cycle performance of secondary batteries while minimizing lithium precipitation, thus extending battery life and maintaining energy efficiency.
Implementation Method 1
The multilayer graphene are loaded with a conductive agent by bonding of a binder
Implementation Method 2
setting a rotation speed and raising the temperature so that the multilayer graphene are loaded with the conductive agent by the bonding of the binder
Data Source
AI summary
The present invention provides a modified graphite negative electrode material, preparation method thereof and a secondary battery. The modified graphite negative electrode material includes a graphite and a multilayer graphene. The multilayer graphene are dispersed in the graphite. The multilayer graphene are loaded with a conductive agent by bonding of a binder. The modified graphite negative electrode material can achieve a higher compaction density for the negative electrode, and can effectively improve the lithium precipitation of the negative electrode of the secondary battery while improving the cycle performance of the secondary battery when being applied to the secondary battery.