Bio-mineralized Cathode Materials for High-Voltage Lithium Cells
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Solution Overview
Problem
Current lithium battery materials face limitations such as voltage instability, self-destruction during charging/discharging, and poor cycle life due to mechanical and electrostatic strain, leading to voltage and capacity fade, especially at high temperatures.
Innovation Solution
Development of bio-mineralized compositions for electrochemical applications, specifically using calcium-based bio-materials like Hydroxyapatite, which provides high energy density and specific capacity by stabilizing lithium storage and reducing acid formation, thereby enhancing battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium cobalt oxide (LiCoO2) is used as cathode material to achieve high energy density, then voltage is limited to about 4.2 V and only 50% of lithium can be used during charge/discharge, but charging beyond 4.2 V causes crystal structure destabilization and self-destruction of the cell
Solution Approach 1:
The patent employs composite cathode materials combining lithium cobalt oxide with other lithium metal oxides (such as lithium nickel cobalt aluminum oxide or lithium nickel cobalt manganese oxide) to create a composite structure that enables operation at higher voltages (4.3-4.45 V) while maintaining structural stability. This composite approach allows utilization of more than 50% of lithium capacity without causing crystal structure destabilization or cell self-destruction.
Solution Approach 2:
The patent modifies operating parameters by increasing the charge voltage cutoff from the conventional 4.2 V to 4.3-4.45 V, and adjusts the chemical composition ratios of the composite materials to enable stable operation at these elevated voltages, thereby extracting more lithium capacity while maintaining cell reliability.
2Quantity of substance
If lithium cobalt manganese nickel oxide composite material is used to achieve high capacity, then capacity is increased, but voltage is lost during repeated battery cycling
Solution Approach 1:
The patent uses composite materials combining lithium cobalt manganese nickel oxide with stabilizing components such as lithium nickel cobalt aluminum oxide or spinel structures. This composite design maintains high capacity while the stabilizing components prevent voltage fade during cycling by providing structural support and reducing manganese dissolution.
Solution Approach 2:
The patent incorporates protective coatings or stabilizing phases in the composite material design that preemptively counteract the voltage fade mechanism by preventing manganese dissolution and structural degradation before they can occur during cycling, thereby maintaining voltage stability over extended cycle life.
3Quantity of substance
If spinel lithium manganese nickel oxide is used to achieve high voltage and high energy density, then energy density is increased, but manganese dissolution at high temperature seriously harms material performance
Solution Approach 1:
The patent combines spinel lithium manganese nickel oxide with other stable cathode materials or protective coatings in a composite structure. This composite design maintains the high energy density benefits of the spinel phase while the other components or coatings act as barriers to prevent manganese dissolution at elevated temperatures.
Solution Approach 2:
The patent introduces intermediary protective layers or stable matrix materials in the composite structure that mediate between the spinel phase and the electrolyte, preventing direct contact and dissolution of manganese ions while allowing lithium ion transport, thereby preserving material performance at high temperatures.
4Quantity of substance
If silicon or tin based alloys are used as anode material to achieve high volumetric and gravimetric capacities, then capacity is increased to much higher than graphite's 372 mAhr/g, but poor cycle life is the major limitation
Solution Approach 1:
The patent encapsulates silicon or tin particles within a matrix material or core-shell structure, nesting the high-capacity material inside a protective and mechanically stable housing. This nested design allows the silicon/tin to expand and contract during cycling without structural failure, maintaining high capacity while dramatically improving cycle life.
Solution Approach 2:
The patent employs flexible buffer layers or thin film coatings around silicon/tin anode particles that can accommodate the volume expansion and contraction during lithium insertion/extraction. These flexible shells maintain structural integrity over many cycles while allowing the high-capacity core material to function, thereby extending cycle life.
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 bio-mineralized materials exhibit improved electrochemical performance with high energy density, specific capacity, and prolonged cycle life, maintaining efficiency and stability even at elevated temperatures, outperforming traditional materials.
Implementation Method 1
Bio-material also absorbs halide ion and hinders the formation of acid, which usually formed by side reactions in a cell
Data Source
AI summary
A bio-mineralized composition for use in an electrochemical cell is described. The bio-mineralized composition may comprise a material represented by general formula y[Li1±xMaOc].(1-y)[Mb(PO4)3±d(Ap)1±e].Cz or y[Ma].(1-y)[Mb(PO4)3±d(Ap)1±e].Cz or y[Li1±xMaOc].w[Li2±xMaOc].(1-y-w)[Mb(PO4)3±d(Ap)1±e].Cz or y[MaOv].(1-y)[Mb(PO4)3±d(Ap)1±e].Cz where M represents at least one element; Ap represents group of mixtures; C represents Carbon or its allotropes; P represents element phosphorous; Si represents silicon; Li represents lithium; B represents boron; O represents oxygen and x, y, z, w, a, b, c, d and e represent a number.