3D Battery Elastic Member Anode Expansion
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Solution Overview
Problem
Three-dimensional (3D) secondary batteries face rapid degradation due to deformation caused by the expansion of the anode active material layer during charging and discharging cycles, which reduces their charge capacity and lifespan.
Innovation Solution
Incorporating elastic members, such as styrene-butadiene rubber or silicone rubber, into the battery structure to absorb the expansion of the anode active material layer, thereby mitigating deformation and enhancing the battery's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon, silicon doped with phosphorus, or lithium is used as the anode active material to increase charge capacity, then the charge capacity is increased, but a large volume change occurs during charging and discharging cycles causing battery degradation
Solution Approach 1:
The patent applies this principle by introducing an elastic member that functions as a flexible structural element to accommodate the volume expansion of the anode active material during charging. The elastic member deforms elastically to absorb the expansion stress, preventing structural damage to the battery while allowing the use of high-capacity materials like silicon or lithium.
Solution Approach 2:
The patent implements this principle by pre-installing the elastic member within the battery structure before charging begins. The elastic member is positioned to anticipate and cushion the expansion of the anode active material during subsequent charging cycles, preventing harmful stresses before they occur.
2Quantity of substance
If the anode active material layer expands during charging, then charge capacity is improved, but deformation of the battery structure occurs leading to rapid degradation
Solution Approach 1:
The elastic member acts as a flexible structural component that deforms with the expanding anode material, accommodating volume changes without causing permanent deformation or damage to the battery structure. This allows the battery to maintain its shape while supporting high-capacity anode materials.
Solution Approach 2:
The patent applies this principle by utilizing the elastic properties of the elastic member, which changes its physical state (deforms elastically) in response to the expansion of the anode active material. This parameter change allows the structure to adapt to volume changes without permanent deformation.
3Reliability
If elastic members are added to absorb anode expansion, then battery stability is improved, but device complexity increases
Solution Approach 1:
The elastic member serves multiple functions simultaneously: it absorbs expansion stress, maintains structural integrity, prevents deformation, and enables the use of high-capacity anode materials. This multi-functionality justifies the addition of the component by delivering multiple benefits from a single structural element.
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 use of elastic members effectively prevents deformation and degradation of the 3D secondary battery, leading to increased lifespan and improved charge capacity by accommodating the volume changes of the anode active material during charging and discharging.
Implementation Method 1
a 3D secondary battery having elastic members that mitigate the expansion of an anode active material layer
Data Source
AI summary
A three dimensional (“3D”) secondary battery includes an electrolyte layer and an anode active material layer that are sequentially stacked on a plurality of first trenches that are provided in a cathode active material layer where, in the anode active material layer, a plurality of second trenches having similar shape to that of the first trenches is provided and the plurality of second trenches are filled with an elastic member and where the elastic member absorbs expansion of the anode active material layer during charging and discharging the 3D secondary battery, and thus, the degradation of the 3-dimensional secondary battery is prevented.