Lithiated Vanadium Oxide Anode Material for Fast-Charging Li-Ion Cells
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Solution Overview
Problem
Li-ion batteries with graphite anodes take too long to charge and are prone to lithium plating during rapid charging, leading to shorting and aging issues.
Innovation Solution
An anode material comprising Li3±xV2±yO5±z with an omega structure in the Fm3m space group, which allows for reversible lithium insertion and includes dopants like Mg, Ca, Sc, B, Y, Al, Ti, Zr, Nb, Ta, Cr, Mo, or W, paired with cathodes such as LiMn2O4 or LiNixCoyMnzO2, enabling fast charging without lithium plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphite is used as the anode material, then energy density is improved, but charging time increases and lithium plating occurs during rapid charging
Solution Approach 1:
The patent changes the fundamental parameter of anode material composition from graphite to a composite system containing lithium-rich compounds (Li3V2O5, Li4V2O5, Li5V2O5) and lithium metal. This parameter change enables faster lithium ion insertion kinetics and provides excess lithium reservoirs that can rapidly supply lithium during fast charging without causing plating, while maintaining high energy density through the high capacity of lithium metal and lithiated compounds.
Solution Approach 2:
The patent employs a composite anode material system combining multiple components: lithium-rich vanadium oxides (Li3V2O5, Li4V2O5, Li5V2O5) and lithium metal. This composite structure leverages the advantages of each component - the lithiated compounds provide structural stability and reversible lithium insertion, while lithium metal provides high capacity and rapid lithium supply capability, collectively resolving the contradiction between energy density and charging speed.
2Quantity of substance
If graphite is used as the anode material, then energy density is improved, but reliability deteriorates due to lithium plating and shorting
Solution Approach 1:
The patent applies preliminary anti-action by incorporating excess lithium in the form of lithium metal and lithium-rich compounds (Li3V2O5, Li4V2O5, Li5V2O5) into the anode structure before charging. This pre-loaded lithium reservoir ensures that during rapid charging, lithium ions are drawn from this reservoir rather than plating on the graphite surface, thereby preventing shorting and maintaining battery reliability and safety.
Solution Approach 2:
The composite anode system combines lithium-rich vanadium oxides with lithium metal to create a structurally stable framework that prevents the formation of dendritic lithium deposits. The lithiated compounds act as a buffer that controls lithium ion flux, preventing harmful plating while maintaining high energy density, thus improving reliability.
3Quantity of substance
If graphite is used as the anode material, then energy density is improved, but productivity increases due to faster charging capability
Solution Approach 1:
The patent fundamentally changes the anode material parameter from graphite to a lithium-rich composite system, which exhibits superior lithium ion diffusion kinetics. The lithium metal and lithiated compounds (Li3V2O5, Li4V2O5, Li5V2O5) provide low-resistance pathways for lithium ion transport, enabling rapid charging without compromising energy density, thus improving charging speed and productivity.
4Productivity
If lithium-rich anode material is used, then charging speed is improved, but device complexity increases due to new material composition
Solution Approach 1:
While the material composition does change, the patent uses a systematic approach by employing compounds with similar crystal structures (lithiated vanadium oxides with omega and rocksalt structures). This structural similarity simplifies the manufacturing process and material handling compared to completely novel materials, thereby limiting the increase in device complexity while achieving fast charging capability.
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
Enables Li-ion batteries to charge in minutes while maintaining high energy density and stability, reducing the risk of lithium plating and internal shorting.
Implementation Method 1
lithium may be reversibly inserted to form at least one of Li4V2±yO5±z and Li5V2±yO5±z
Data Source
AI summary
Materials, designs, methods of manufacture, and devices are provided for an anode material for a rechargeable lithium-ion battery. For example, an anode material may include Li3±xV2±yO5±z, wherein 0≤x≤7, 0≤y≤1, and z may be based on the charge resulting from Li3±x and V2±y. Also, a cell can include a lithiated anode material. The lithiated anode material may include Li3±xV2±y O5±z. The lithiated anode material may be casted on a first substrate to form a lithiated anode, having a separator stacked on the lithiated anode. The separator may include electrolytes. A cathode can be stacked on the separator. The cathode being formed by casting a cathode material on a second substrate.