Porous Carbon-Coated Electrode Material for High-Rate Lithium Batteries
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Solution Overview
Problem
Conventional lithium batteries experience decreased efficiency and shortened lifespan due to rapid consumption of lithium ions during high-rate charging and discharging, leading to adverse effects on their high-rate characteristics and lifespan.
Innovation Solution
A composite electrode active material is developed, featuring a core capable of intercalating and deintercalating lithium, coated with a porous carbonaceous material to form a large interface with the electrolyte, thereby maintaining lithium ion concentration and preventing local electrolyte shortages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-rate charging and discharging is performed, then power output is improved, but lithium ion concentration is rapidly consumed leading to decreased efficiency and shortened lifespan
Solution Approach 1:
The patent applies porous carbon coating material on the electrode active material surface. The porous structure provides high surface area and interconnected pores that facilitate rapid lithium ion transport while maintaining adequate ion concentration during high-rate charging/discharging, thus improving power output without sacrificing lifespan
Solution Approach 2:
The patent creates a composite structure by coating electrode active material particles with porous carbon material. This composite design combines the high capacity of the core active material with the high conductivity and ion transport capability of the porous carbon shell, enabling both high power output and long lifespan
2Power
If high-rate charging and discharging is performed, then power output is improved, but efficiency decreases due to rapid lithium ion consumption
Solution Approach 1:
The porous carbon coating provides a three-dimensional network of pores that enables efficient lithium ion diffusion pathways. This maintains high ion concentration at the electrode surface during high-rate operation, preserving charging/discharging efficiency while delivering high power output
3Ease of manufacture
If conventional electrode active material is used, then manufacturing simplicity is maintained, but local electrolyte shortages occur causing side reactions
Solution Approach 1:
The porous carbon coating creates an expanded interface between the electrode active material and electrolyte. This increased surface area with interconnected pores ensures adequate electrolyte distribution and lithium ion supply, preventing local shortages that would otherwise cause harmful side reactions
Solution Approach 2:
The porous carbon coating acts as an intermediary layer between the electrode active material and the electrolyte. This intermediate porous structure facilitates smooth lithium ion transport and maintains proper ion concentration, preventing direct harmful interactions while preserving manufacturing simplicity
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 electrode active material enhances the high-rate characteristics and extends the lifespan of lithium batteries by maintaining lithium ion concentration and preventing side reactions caused by local electrolyte shortages.
Implementation Method 1
a coating layer formed on at least a part of a surface of the core, wherein the coating layer comprises a porous carbonaceous material
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
In some aspects, a composite electrode active material including a core capable of intercalating and deintercalating lithium and a coating layer formed on at least a part of the surface of the core, wherein the coating layer includes a porous carbonaceous material is provided.