Alkali Metal-Vanadium Oxide Graphene Composite Electrode
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Solution Overview
Problem
Research on zinc secondary batteries has been limited by reduced capacities and manganese elution during electrochemical reactions in MnO2-based materials, and there is a need for a stable, eco-friendly, and cost-effective alternative to lithium secondary batteries.
Innovation Solution
A zinc ion secondary battery using an alkali metal-vanadium oxide/graphene oxide composite with a layered structure, where zinc ions are intercalated and deintercalated, is developed, utilizing solvothermal synthesis to create a stable and efficient electrode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MnO2-based materials are used as electrode active material for zinc secondary batteries, then the battery can operate with stable and eco-friendly zinc, but the capacities are reduced and Mn is eluted during continuous electrochemical reaction
Solution Approach 1:
The patent uses a composite material consisting of vanadium oxide particles (MxV3O8) dispersed on a reduced graphene oxide sheet. This composite structure combines the high capacity of vanadium oxide with the structural stability and conductivity of reduced graphene oxide, preventing Mn elution while maintaining high capacity during continuous electrochemical reactions.
Solution Approach 2:
The reduced graphene oxide sheet provides a porous, two-dimensional structure that allows efficient ion transport and accommodates vanadium oxide particles. This porous structure maintains electrode integrity during cycling, preventing material collapse and capacity loss while allowing zinc ions to access active sites effectively.
2Quantity of substance
If lithium secondary batteries are used to meet increasing demand, then high performance can be achieved, but rare metal elements such as lithium may not be sufficiently supplied
Solution Approach 1:
The patent changes the chemical composition parameter by replacing lithium with zinc and vanadium oxide with alkali metal-vanadium oxide (MxV3O8). This substitution maintains the electrochemical performance while using abundant, non-rare earth elements. The layered structure of MxV3O8 with alternating alkali metal and vanadium oxide layers provides pathways for ion intercalation similar to lithium-based materials.
3Reliability
If zinc secondary batteries are developed as stable and eco-friendly alternative, then high stability and eco-friendliness can be achieved, but research on electrode active material has not been sufficiently conducted
Solution Approach 1:
The reduced graphene oxide sheet acts as an intermediary between the vanadium oxide particles and the zinc ions. It provides a conductive framework that facilitates electron transport while the vanadium oxide particles provide the active sites for ion intercalation. This intermediary structure enables efficient charge transfer and maintains structural stability during cycling.
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 alkali metal-vanadium oxide/graphene oxide composite exhibits improved rechargeability, cycle stability, and high-capacity retention, maintaining performance even at high current densities, addressing the limitations of existing zinc secondary battery materials.
Implementation Method 1
Zinc ions may be intercalated into or deintercalated from empty spaces between layers in the layered structure
Implementation Method 2
utilizing solvothermal synthesis to create a stable and efficient electrode active material
Data Source
AI summary
Disclosed is a zinc ion secondary battery. More particularly, the zinc ion secondary battery includes a first electrode; a second electrode; and an electrolyte disposed between the first electrode and the second electrode, wherein an active material included in the first electrode is an alkali metal-vanadium oxide/graphene oxide composite, wherein the alkali metal-vanadium oxide has a layered structure in which alkali metal layers and vanadium oxide layers are alternately stacked. Accordingly, a zinc ion battery system including the K2V3O8/a graphene oxide composite as an electrode active material can exhibit excellent rechargeability and have a high discharge capacity and an excellent capacity retention rate.