Silver-Carbon Anode Composite for Uniform Current Distribution
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Solution Overview
Problem
Existing anode materials for all-solid secondary batteries face challenges in achieving uniform distribution of metal particles, leading to aggregation and non-uniform current distribution, which affects the performance and safety of the batteries, especially in automotive applications where safety is critical.
Innovation Solution
The development of a metal-carbon composite anode material, specifically a silver-carbon composite, where silver particles are uniformly dispersed and complexed within carbon material, achieved through a preparation process involving polyvinylpyrrolidone in glycerol, heating, and subsequent drying, ensuring uniform dispersion and preventing particle aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal particles are added to carbon material for anode, then electrical conductivity and catalytic activity are improved, but particle aggregation occurs leading to non-uniform current distribution
Solution Approach 1:
The patent uses polyvinylpyrrolidone (PVP) as a dispersant intermediary between metal particles and carbon material. The PVP adsorbs onto metal particle surfaces through its carbonyl groups, providing steric stabilization and preventing aggregation. This intermediary agent enables uniform distribution of metal particles within the carbon matrix, resolving the contradiction between improving electrical conductivity and maintaining compositional stability.
Solution Approach 2:
The patent creates a composite anode material consisting of metal particles, carbon material, and polymer dispersant. This multi-component composite structure combines the electrical conductivity of metal, the structural stability of carbon, and the dispersing capability of polymer, achieving both improved conductivity and uniform particle distribution simultaneously.
2Reliability
If metal particles are uniformly dispersed in carbon material, then current distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary dispersion of metal particles in the polymer solution before adding the carbon material. This preliminary action ensures that metal particles are already uniformly distributed and stabilized by the polymer when the carbon matrix is introduced, simplifying the overall manufacturing process while achieving uniform current distribution.
Solution Approach 2:
The patent employs a dynamic preparation process involving heating, stirring, and controlled drying. The heating step activates the polymer for better adsorption, while controlled drying prevents premature aggregation. These dynamic process parameters enable uniform dispersion without requiring overly complex manufacturing equipment or procedures.
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 silver-carbon composite ensures uniform current distribution in the anode layer, enhancing the performance and safety of all-solid secondary batteries by stabilizing the thermal decomposition process and improving the uniformity of Li ion flux, thereby addressing the aggregation issues of metal particles, enhancing the effectiveness and reliability of the battery.
Implementation Method 1
the metal particles are dispersed and complexed in the carbon material
Implementation Method 2
Heating the reaction mixture at 80 °C to 120 °C for 8 h to 16 h to obtain silver particles uniformly dispersed in the carbon material
Implementation Method 3
drying the filtrate in a vacuum oven at 80 °C to 100 °C for 4 h to 12 h to obtain the silver-carbon composite without glycerol
Data Source
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AI summary
The present invention relates to an anode material, an anode layer including the same, an all-solid secondary battery including the anode layer, and a method of preparing the anode material. The metal-carbon composite includes a carbon material and metal particles. The metal particles are uniformly dispersed and complexed in the carbon material.