Anode Material Coating for Battery Stability
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Solution Overview
Problem
Conventional anode materials for secondary batteries face issues such as electrolyte dissolution, deteriorated battery characteristics, and instability due to segregation of lithium alloys and reactivity with the electrolyte, which affect charging/discharging efficiency and cycle characteristics.
Innovation Solution
A method involving coating a high-crystallinity core carbonaceous material, preferably natural graphite, with a coating carbonaceous material and subsequent calcination to achieve a specific pore structure and density, resulting in an anode material with improved stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon-based materials are used as anode material, then electrolyte dissolution is prevented due to low reactivity, but potential changes are increased due to lithium ion emission
Solution Approach 1:
The patent uses a composite structure combining crystalline core carbonaceous material (providing low reactivity and electrolyte stability) with amorphous coating carbonaceous material (providing stable potential characteristics). This composite approach allows both materials to contribute their advantageous properties to the overall anode performance.
Solution Approach 2:
Different regions of the anode material have different properties: the core region uses crystalline carbon for structural stability and low reactivity, while the coating layer uses amorphous carbon for smooth lithium ion insertion and stable potential. This local differentiation optimizes both electrolyte stability and potential characteristics.
2Temperature
If graphite-based materials are used as anode material, then potential changes are small due to lithium ion emission, but electrolyte dissolution occurs which destroys electrode materials
Solution Approach 1:
The patent creates a composite anode material where crystalline core carbonaceous material provides electrolyte stability and resistance to dissolution, while amorphous coating carbonaceous material provides smooth lithium ion insertion characteristics and stable potential. This composite structure resolves the contradiction between potential stability and electrode stability.
Solution Approach 2:
The amorphous coating carbonaceous material acts as an intermediary layer between the electrolyte and the crystalline core, facilitating smooth lithium ion insertion while the crystalline core provides the stable structural foundation. This intermediary structure prevents direct harmful interactions while maintaining beneficial properties.
3Productivity
If lithium alloys are used as anode material, then charging/discharging efficiency is improved, but stable electrical property is not ensured due to alloy segregation during extended charge/discharge cycles
Solution Approach 1:
The patent replaces the unstable lithium alloy anode with a stable carbonaceous material anode that, while having slightly lower theoretical capacity, provides superior long-term stability and cycle life. The carbonaceous material effectively serves as a more reliable, long-lasting alternative to short-lived lithium alloys.
4Productivity
If metal lithium is used as anode material, then charging/discharging efficiency is high, but internal short circuit is caused due to dendrite formation during lithium ion deposition
Solution Approach 1:
The patent replaces metal lithium anode with carbonaceous material anode to eliminate dendrite formation and internal short circuit risks. Although metal lithium offers higher theoretical capacity, the carbonaceous material provides safer, more reliable operation by preventing harmful dendrite growth during charging cycles.
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 anode material exhibits enhanced discharging capacity and charging/discharging efficiency, with a specific pore structure that inhibits electrolyte dissolution and maintains battery stability, achieving a discharging capacity of 340 mAh/g and charging/discharging efficiency of 90% or more.
Implementation Method 1
coating a high-crystallinity core carbonaceous material with a coating carbonaceous material
Implementation Method 2
calcinating the high-crystallinity core carbonaceous material
Implementation Method 3
a lithium ion secondary battery using a metal lithium as an anode material
Data Source
AI summary
Disclosed are an anode material for a secondary battery, a method for producing the same and a secondary battery using the same. The present invention provides the anode material for a secondary battery produced by coating a high-crystallinity core carbonaceous material with a coating carbonaceous material and calcinating the high-crystallinity core carbonaceous material, wherein the anode material has a specific volume of 0.002 cc/g or less. The anode material for a secondary battery of the present invention may be produced by coating a high-crystallinity core carbonaceous material with a coating carbonaceous material and undergoing a predetermined calcination process, and the anode material can have an increased volume ratio of the micropores. Accordingly, the secondary battery of the present invention may be useful to improve charging/discharging capacity and efficiency since sorption of lithium ion in the anode material is improved.