Crystalline Carbon Anode Material for Better Cycle-Life Adhesion
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high electrochemical performance due to limitations in the electrochemical characteristics of their negative active materials.
Innovation Solution
A negative active material for rechargeable lithium batteries is developed, comprising crystalline carbon with a specific Raman spectrum peak intensity ratio (ID/IG) of less than 0.05, combined with a cellulose-based compound and an aqueous binder, to enhance electrochemical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional negative active materials are used in rechargeable lithium batteries, then the battery can be manufactured with standard materials, but the electrochemical characteristics and cycle-life performance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Raman spectrum peak intensity ratio (ID/IG) of crystalline carbon to be less than 0.05. This specific parameter threshold ensures high crystallinity and proper orientation of the carbon structure, which directly improves electrochemical characteristics and cycle-life performance while maintaining manufacturability through controlled synthesis parameters
Solution Approach 2:
The patent uses composite materials by combining crystalline carbon with specific crystal structures (such as hexagonal or rhombohedral structures) and controlling the orientation of crystal planes. This composite approach with oriented crystal structures enhances the electrochemical performance and adherence to current collector without complicating the manufacturing process
2Reliability
If the crystalline carbon has high crystallinity (low ID/IG ratio), then the adherence to current collector and electrochemical performance improve, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a clear parameter threshold (ID/IG < 0.05) that quantifies the required crystallinity level. This parameter-based approach provides a measurable target for manufacturing processes, making it easier to control crystal orientation and ensure proper adherence without excessive precision requirements
Solution Approach 2:
The crystalline carbon material exhibits self-organizing properties during synthesis, where the crystal structures naturally orient themselves to achieve the desired low ID/IG ratio. This self-service characteristic reduces the need for complex external control mechanisms during manufacturing, simplifying the production process while ensuring high adherence
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 proposed negative active material exhibits improved adherence to the current collector and enhanced electrochemical characteristics, such as cycle-life performance, thereby contributing to the overall performance of rechargeable lithium batteries.
Implementation Method 1
active materials capable of intercalating and deintercalating lithium ions
Implementation Method 2
generate electrical energy due to the oxidation and reduction reaction when lithium ions are intercalated and deintercalated
Implementation Method 3
Raman spectrum peak intensity ratio (ID/IG) of a peak intensity (ID) of a D peak relative to a peak intensity (IG) of a G peak
Data Source
AI summary
Disclosed are a negative active material for a rechargeable lithium battery, a negative electrode including the negative active material, and a rechargeable lithium battery including the same. The negative active material includes crystalline carbon, wherein the crystalline carbon has a Raman spectrum peak intensity ratio (ID/IG) of a peak intensity (ID) of a D peak (about 1360 cm−1 to about 1370 cm−1) relative to a peak intensity (IG) of a G peak (about 1580 cm−1 to about 1590 cm−1) of less than about 0.05.