Solid-State Lithium Battery Anode Layer for Fast Charging
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Solution Overview
Problem
Existing lithium-deposition-type lithium secondary batteries face challenges in achieving sufficient fast charge characteristics despite advancements in electrode design.
Innovation Solution
Incorporating a carbon particle layer with a specific intensity ratio (IG/ID) on the negative electrode current collector, enhancing lithium ion diffusion and contact properties, and using additional layers to manage lithium deposition and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional conductive layer is used on the negative electrode current collector, then basic electrical conductivity is achieved, but fast charge characteristics are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the carbon particles by specifying an intensity ratio R(IG/ID) of 7 or more from Raman scattering spectroscopy. This parameter change transforms ordinary carbon particles into highly crystalline graphite-like structures that enable superior lithium ion diffusion and achieve fast charge characteristics while maintaining reliability
Solution Approach 2:
The patent creates a composite conductive layer combining carbon particles with specific crystalline structure (R≥7) with the negative electrode current collector. This composite structure provides both the electrical conductivity needed for basic operation and the enhanced lithium ion diffusion pathways required for fast charging, resolving the contradiction between basic functionality and advanced performance
2Quantity of substance
If high-potential and large-capacity electrode materials are used, then energy density is improved, but safety issues arise due to combustible organic electrolyte
Solution Approach 1:
The patent fundamentally changes the physical state of the electrolyte from liquid to solid. By using oxide-based or sulfide-based solid electrolytes with high ionic conductivity, the system eliminates the combustibility issue while maintaining high energy density through compatibility with high-potential cathode materials and lithium metal anodes
3Ease of manufacture
If carbon particles with low crystallinity are used in the conductive layer, then manufacturing is easier, but lithium ion diffusion is insufficient
Solution Approach 1:
The patent establishes a specific parameter threshold for carbon particles (intensity ratio R(IG/ID) ≥ 7) that corresponds to high crystallinity. This parameter specification ensures rapid lithium ion diffusion along the ordered graphite layers while providing clear manufacturing guidance for selecting or producing appropriate carbon materials
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 solution enables fast charge capabilities while maintaining battery performance and preventing short circuits, improving charge-discharge efficiency and safety.
Implementation Method 1
The solid electrolyte is a material mainly made of an ion conductor that enables ion conduction in a solid
Implementation Method 2
carbon particles having an intensity ratio R (IG/ID) of G-band peak intensity (IG) and D-band peak intensity (ID) measured by Raman scattering spectroscopy
Implementation Method 3
In the charging process of such a lithium-deposition-type all-solid-state lithium secondary battery, lithium metal is deposited between the solid electrolyte layer and the negative electrode current collector
Data Source
AI summary
A lithium secondary battery has a positive electrode including a positive electrode current collector and a positive electrode active material layer containing a positive electrode active material disposed on the positive electrode current collector; a negative electrode including a negative electrode current collector, in which lithium metal is deposited on the negative electrode current collector when charging; and a solid electrolyte layer between the positive electrode and the negative electrode. The lithium secondary battery is characterized that a carbon particle layer containing carbon particles having a intensity ratio R (IG/ID) of G-band peak intensity (IG) and D-band peak intensity (ID) measured by raman scattering spectroscopy of 7 or greater, is arranged on at least a part of a region, where the positive electrode active material layer faces the negative electrode current collector, of a main surface of the negative electrode current collector facing the solid electrolyte layer.