Porous Cable Battery Anode for Impact Resistance
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Solution Overview
Problem
Cable-type secondary batteries are prone to short circuits due to external physical impact and suffer from performance deterioration due to expansion and shrinkage of electrodes during charging and discharging, especially when Si or Sn is used as an anode active material, limiting their adaptability and reliability.
Innovation Solution
A method for manufacturing a porous anode with a solid electrolyte layer, involving a current collector coated with a porous shell of anode active material and a solid electrolyte layer, which provides stress relief and increased surface area for improved electrochemical reactivity, using materials like Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, Fe, and their oxides, and a solid electrolyte composed of gel, solid, or plastic crystal electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cable-type secondary battery structure is adopted to achieve flexible shapes and high length-to-diameter ratio, then adaptability to mobile device shapes is improved, but the battery becomes more susceptible to external physical impact causing short circuits
Solution Approach 1:
The patent applies beforehand cushioning by introducing a porous structure within the electrode assembly that can absorb and cushion external physical impacts before they reach the internal components. The porous electrolyte and porous electrode materials create a buffer zone that mitigates the effect of external shocks, preventing short circuits while maintaining the flexible cable-type structure.
Solution Approach 2:
The patent utilizes porous materials throughout the electrode assembly, including porous electrolyte and porous electrode materials, which provide both mechanical cushioning against external impacts and maintain ionic conductivity. The porous structure absorbs physical stress while allowing ion transport, thus improving reliability without sacrificing the flexible cable-type geometry.
2Quantity of substance
If Si or Sn is used as anode active material to improve capacity, then energy storage capability is improved, but expansion and shrinkage during charging and discharging causes active material to fall off
Solution Approach 1:
The patent employs porous electrode materials for the anode that can accommodate Si or Sn active materials. The porous structure provides internal space for volume expansion during lithiation while maintaining structural integrity, preventing the active material from falling off. This allows high-capacity materials like Si and Sn to be used without suffering from their expansion-induced degradation.
Solution Approach 2:
The patent uses composite material structures where the anode active material (Si or Sn) is integrated within a porous matrix or composite structure. This composite approach combines the high capacity of Si/Sn with the structural stability of the porous substrate, enabling the active material to expand and contract without detaching from the current collector.
3Productivity
If a porous shell structure is formed on the current collector to increase surface area for electrochemical reactivity, then reaction efficiency is improved, but structural integrity may be compromised
Solution Approach 1:
The patent forms a porous shell structure on the current collector that dramatically increases the surface area available for electrochemical reactions, improving productivity. The porous structure is designed with appropriate pore size and wall thickness to maintain structural integrity while maximizing reactive surface area, thus achieving high electrochemical activity without compromising strength.
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 porous anode structure enhances the battery's resistance to physical impact, stabilizes volume changes during charging, and improves ionic conductivity by increasing the surface area for lithium ion mobility, thereby enhancing the battery's performance and durability.
Implementation Method 1
a porous shell formed by coating the surface of the core with an anode active material
Implementation Method 2
a solid electrolyte layer formed by filling the pores of the porous shell with a solid electrolyte
Implementation Method 3
making an anode by immersing a core as a current collector having a horizontal cross section of a predetermined shape and extending longitudinally in the aqueous solution, then applying an electric current to form a porous shell of the anode active material on the surface of the core
Data Source
AI summary
Provided is a method for manufacturing an anode of a cable-type secondary battery having a solid electrolyte layer, including preparing an aqueous solution of an anode active material, making an anode by immersing a core as a current collector having a horizontal cross section of a predetermined shape and extending longitudinally in the aqueous solution, then applying an electric current to form a porous shell of the anode active material on the surface of the core, and forming a solid electrolyte layer on the surface of the anode by passing the anode through a solid electrolyte solution. The anode has a high contact area to increase the mobility of lithium ions, thereby improving battery performance. Also, the anode is capable of relieving stress and pressure in the battery, such as volume expansion during charging and discharging, thereby preventing battery deformation and ensuring battery stability.