Non-Aqueous Battery Cathode Composition for Pulse Discharge Stability
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Solution Overview
Problem
Flat non-aqueous electrolyte solution batteries struggle to provide sufficient pulse discharge characteristics for LPWA communication devices due to insufficient lithium ion pathways and high diffusion resistance, leading to voltage drops during pulse discharge.
Innovation Solution
A non-aqueous electrolyte solution battery design featuring a positive electrode with a carbon material having a specific Raman spectroscopic analysis-defined peak intensity ratio (0.5≤ID/IG≤1.3) and a mass ratio of manganese dioxide to carbon material (90:10 to 97:3), along with an optimized non-aqueous electrolyte solution and container configuration to enhance lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If carbon materials with high graphitization degree (0.6≤ID/IG≤0.8) are used to improve electron conductivity, then electron conductivity is improved, but lithium ion pathways become insufficient and diffusion resistance increases
Solution Approach 1:
The patent changes the key parameter of carbon material crystallinity by controlling the ID/IG ratio to fall within 0.3-0.5, which is lower than conventional values. This parameter change transforms the carbon structure to provide better lithium ion pathways while maintaining adequate electron conductivity, thereby improving pulse discharge characteristics without excessive diffusion resistance
Solution Approach 2:
The patent uses composite carbon materials comprising both amorphous carbon and crystalline carbon phases. The amorphous carbon provides abundant lithium ion pathways, while the crystalline carbon maintains electron conductivity. This composite structure resolves the contradiction between electron conductivity and lithium ion transport
2Power
If the proportion of graphite in carbon material is excessively large to improve electron conductivity, then electron conductivity is improved, but the passing route for lithium ion becomes insufficient
Solution Approach 1:
The patent applies local quality by creating regions with different carbon structures within the positive electrode. Areas with amorphous carbon (ID/IG=0.3-0.5) provide lithium ion pathways, while localized crystalline regions maintain electron conductivity. This spatial differentiation of carbon properties resolves the contradiction between electron conductivity and lithium ion passage
3Reliability
If conventional carbon materials are used to maintain stable characteristics, then reliability is improved, but voltage drop occurs during pulse discharge
Solution Approach 1:
The patent changes the Raman spectral parameters (ID/IG ratio) to define a new class of carbon materials with optimized properties. By setting ID/IG within 0.3-0.5, the carbon material achieves both stability and low voltage drop during pulse discharge, resolving the contradiction between reliability and power delivery
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 battery achieves improved pulse discharge characteristics in the order of several tens of mA, addressing the voltage drop issue and enhancing reliability for LPWA communication devices.
Implementation Method 1
in a spectrum that is measured by performing Raman spectroscopic analysis with respect to the positive electrode by using argon laser at a wavelength of 514.5 nm, an average value of peak intensity ratios ID/IG of an intensity ID of a peak appearing in the vicinity of 1330 cm−1 to an intensity IG of a peak appearing in the vicinity of 1580 cm−1 satisfies a relationship of 0.5≤ID/IG≤1.3
Implementation Method 2
a non-aqueous electrolyte solution; and a container configured to accommodate the positive electrode, the negative electrode, and the non-aqueous electrolyte solution
Implementation Method 3
a positive electrode including manganese dioxide and a carbon material
Data Source
AI summary
A non-aqueous electrolyte solution battery includes a positive electrode containing manganese dioxide and a carbon material; a negative electrode including one of lithium and a lithium alloy; a non-aqueous electrolyte solution; and a container configured to accommodate the positive electrode, the negative electrode, and the non-aqueous electrolyte solution. In a spectrum that is measured by performing Raman spectroscopic analysis with respect to the positive electrode by using argon laser at a wavelength of 514.5 nm, an average value of peak intensity ratios ID/IG of an intensity ID of a peak appearing in the vicinity of 1330 cm−1 to an intensity IG of a peak appearing in the vicinity of 1580 cm−1 satisfies a relationship of 0.5≤ID/IG≤1.3.