Lithium Anode Composite Structure Suppressing Dendrite Growth
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Solution Overview
Problem
Lithium secondary battery anodes face limitations due to the high reactivity of lithium metal, leading to side reactions with the liquid electrolyte and the risk of internal short circuits caused by lithium dendrite growth, which can result in battery fires and explosions.
Innovation Solution
An anode composite structure is developed by agglomerating particles such as carbon spheres and graphene, with a lithium metal or alloy filling the space between them, facilitating uniform lithium plating and stripping while suppressing dendrite growth through functional groups and capillary phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as anode material to achieve high energy density, then capacity increases, but side reactions with liquid electrolyte occur and lithium dendrite growth risk increases
Solution Approach 1:
The patent applies local quality by creating a composite anode structure where lithium metal is distributed in specific locations within a particle matrix. The particles have different properties (conductive carbon, polymer binder) arranged in specific spatial configurations, with lithium filling interstitial spaces. This localized distribution enables high capacity while controlling dendrite formation through uniform lithium placement throughout the particle structure rather than concentrated deposits.
Solution Approach 2:
The patent employs composite materials by combining lithium metal with a matrix of particles comprising conductive carbon materials (graphene, carbon nanotubes, carbon spheres) and polymer binders. This composite structure provides multiple benefits: the carbon particles maintain electrical conductivity, the polymer provides mechanical stability and controls lithium distribution, and the composite architecture prevents direct lithium contact with electrolyte while maintaining high capacity through the lithium component.
2Stability of the object's composition
If lithium foil is used to maintain structure, then structural stability improves, but internal short circuit risk increases due to dendrite growth
Solution Approach 1:
The patent applies porous materials by using a particle matrix with controlled porosity where lithium metal fills the interstitial spaces. The porous particle structure provides pathways for lithium ion transport while the particle walls act as physical barriers that constrain dendrite growth. The porosity is optimized to allow sufficient electrolyte access for lithium plating while preventing continuous dendrite penetration through the anode structure.
Solution Approach 2:
The patent uses the particle composite material as an intermediary between the lithium metal and the external environment. The particles act as a mediator that distributes lithium uniformly, provides mechanical support to prevent structural collapse, and blocks the propagation of dendrites. The polymer binder and carbon particles serve as intermediate layers that decouple the lithium metal from direct contact with electrolyte while maintaining electrical functionality.
3Reliability
If graphite material is used for anode, then safety improves, but energy density is limited due to low theoretical capacity
Solution Approach 1:
The patent applies the nested doll principle by embedding lithium metal within the particle composite structure. The lithium is nested within the interstitial spaces of the particle matrix, which itself is nested within the anode architecture. This nested configuration allows the high-capacity lithium to be protected by the surrounding particle structure, providing safety through the encapsulating particle layers while maintaining high energy density through the high-capacity lithium core.
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
This approach enhances the lifespan and safety of lithium secondary batteries by maintaining anode structure integrity during charging and discharging, preventing dendrite growth and ensuring uniform lithium distribution, thereby improving energy density and reducing the risk of thermal runaway.
Implementation Method 1
facilitating uniform lithium plating and stripping while suppressing dendrite growth through functional groups and capillary phenomenon
Implementation Method 2
suppressing dendrite growth through functional groups
Data Source
AI summary
Disclosed is an anode for a lithium secondary battery including a composite including a structure and a lithium metal or lithium alloy with which the structure is filled.