Anode Active Material Polymer Coating Conductive Particles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries face challenges in maintaining stability and power capacity due to side reactions and mechanical damages to anode active material particles during repeated charging and discharging, leading to degraded conductivity and reduced lifespan.
Innovation Solution
An anode active material is developed with a core particle coated with a polymer layer and conductive particles, where the conductive particles have an average diameter greater than the polymer coating thickness, enhancing electron/ion pathways and preventing surface damage, thereby improving stability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a composition and structure of the anode active material are changed to improve stability of the active material particles, then stability is improved, but conductivity is degraded and power is deteriorated
Solution Approach 1:
The patent applies composite materials by combining the core anode active material particles with a polymer coating layer and conductive particles. The polymer coating provides stability and protection, while the conductive particles (such as carbon black, graphene, or metal nanoparticles) embedded in or on the coating restore and enhance electrical conductivity. This composite structure resolves the contradiction by integrating materials with complementary properties: the polymer matrix ensures structural stability during cycling, while the conductive network maintains efficient electron transport pathways.
2Reliability
If a polymer coating is formed on the core particle to prevent side reactions and mechanical damages, then stability is improved, but conductivity is degraded
Solution Approach 1:
The patent uses conductive particles as an intermediary between the polymer coating and the external circuit. These conductive particles are dispersed within the polymer coating layer, creating conductive pathways that bridge the insulating polymer matrix and the active material core. This intermediary approach allows the polymer coating to maintain its protective function while the conductive particles compensate for the insulation effect, ensuring both stability and conductivity are achieved simultaneously.
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 effectively prevents side reactions and mechanical damages, maintaining anode activity and power capacity over the battery's lifespan by forming electron/ion channels and buffering resistance increases.
Implementation Method 1
a polymer coating formed on a surface of the core particle
Implementation Method 2
conductive particles formed on the polymer coating... forming electron/ion channels
Implementation Method 3
at least some of the conductive particles may be inserted into the polymer coating and may protrude to an outside from a surface of the polymer coating... at least some of the conductive particles may penetrate the polymer coating to contact the core particle
Data Source
AI summary
An anode active material for a secondary battery according to an embodiment of the present invention includes a core particle, a polymer coating formed on a surface of the core particle, and conductive particles formed on the polymer coating. The conductive particles have an average particle diameter greater than a thickness of the polymer coating. The anode active material and a secondary battery having improved stability and reduced resistance are provided using the polymer coating and the conductive particles.