Oxidized Carbon Electrode Coating for Longer Cycle Life
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Solution Overview
Problem
Existing storage devices, such as secondary batteries and capacitors, face challenges in achieving satisfactory cycle lifetime due to difficulties in effectively covering active material surfaces with conductive carbon, leading to inadequate performance.
Innovation Solution
The use of oxidized carbon to cover the active material surfaces, with a specific Raman spectrum peak intensity ratio of 0.25 or more, enhances the cycle lifetime by improving the coverage and conductivity of the electrode material, and a production method involving mixing oxidized carbon with active materials and applying pressure to form a dense layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general conductive carbon is used to cover active material surfaces, then the electrode structure is simple, but the cycle lifetime is insufficient due to inadequate surface coverage
Solution Approach 1:
The patent changes the chemical state parameter of the conductive carbon by using oxidized carbon instead of general conductive carbon. This parameter change enables the carbon to better adhere to and cover the active material surfaces, achieving sufficient coverage (peak intensity ratio b/a ≥ 0.25) and thereby improving cycle lifetime
Solution Approach 2:
The patent creates a composite structure where oxidized carbon particles are integrated with active material particles. This composite approach allows the conductive carbon to effectively cover the active material surfaces while maintaining electrical conductivity, resolving the contradiction between coverage quality and cycle performance
2Reliability
If oxidized carbon is used to cover active material surfaces, then the cycle lifetime and surface coverage are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-oxidizing the conductive carbon particles before mixing them with the active material. This preliminary oxidation treatment modifies the carbon surface properties to enhance adhesion and coverage, so that when the slurry is applied and molded, the carbon automatically achieves uniform distribution and sufficient coverage without requiring complex additional processing steps
3Manufacturing precision
If the peak intensity ratio (b)/(a) is increased to 0.25 or more, then the coverage of active material surfaces is improved, but the amount of conductive carbon required increases
Solution Approach 1:
The patent changes the quality parameter of the conductive carbon (oxidation state) rather than simply increasing the quantity. By using oxidized carbon with enhanced adhesion properties, the patent achieves the required surface coverage (ratio b/a ≥ 0.25) with optimized carbon content, avoiding the need to excessively increase the amount of conductive carbon while still achieving sufficient coverage
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
This approach results in an electrode with improved cycle lifetime, energy density, and reduced internal resistance, as the oxidized carbon effectively suppresses side reactions and enhances the coverage of active material surfaces, leading to better performance in storage devices.
Implementation Method 1
a surface of the active material is covered by the conductive carbon including the oxidized carbon
Implementation Method 2
the conductive carbon including oxidized carbon, in which a surface of the active material is covered by the conductive carbon
Data Source
AI summary
A storage device having excellent cycle lifetime, an electrode used in this storage device, and a production method of the electrode are provided. An electrode comprising an active material and a conductive carbon including oxidized carbon. A surface of the active material is covered by the conductive carbon. A Raman spectrum of the active material covered by the conductive carbon includes a peak intensity (a) derived from the active material and a peak intensity (b) of D-band derived from the conductive carbon. A peak intensity ratio (b)/(a) between the peak intensity (a) and the peak intensity (b) is 0.25 or more.