LNMO Battery Electrolyte Layer for Oxidation Resistance
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Solution Overview
Problem
Lithium nickel manganese oxide batteries face reduced charge and discharge capacity due to oxidative decomposition of halide solid electrolytes, leading to increased internal resistance.
Innovation Solution
Incorporating a solid electrolyte layer with Li, Ti, and F, where Ti is selected from Ca, Mg, Al, Y, or Zr, to enhance oxidation resistance and suppress decomposition, thereby maintaining low internal resistance and improving battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If halide solid electrolyte is used in lithium nickel manganese oxide batteries, then the battery can operate at high voltage, but the electrolyte undergoes oxidative decomposition leading to increased internal resistance and reduced charge-discharge capacity
Solution Approach 1:
An oxide coating layer is introduced as an intermediary between the halide solid electrolyte and the lithium nickel manganese oxide positive electrode. This coating layer acts as a protective barrier that prevents direct contact and oxidative decomposition reactions, while still allowing lithium ion transport. The coating material is specifically selected to be chemically stable against oxidation at high potentials, thus mediating the interaction between the electrolyte and electrode to maintain both high voltage operation and long-term capacity.
Solution Approach 2:
The battery system employs a composite structure combining halide solid electrolyte with oxide coating materials on the positive electrode. This composite approach leverages the high ionic conductivity and wide electrochemical stability window of halide electrolytes for high voltage operation, while the oxide coating provides chemical stability and resistance to oxidative decomposition. The synergistic combination of these materials resolves the contradiction between achieving high power and maintaining reliability.
2Power
If halide solid electrolyte is used to achieve high operating voltage, then power is improved, but oxidative decomposition increases internal resistance
Solution Approach 1:
The oxide coating layer serves as a mediator that physically separates the halide solid electrolyte from the positive electrode, preventing the oxidative decomposition that would otherwise increase internal resistance. This intermediary layer is designed to be ionically conductive while providing chemical stability, thus blocking the harmful oxidation reaction without impeding the useful lithium ion transport, thereby maintaining low internal resistance during high voltage operation.
Solution Approach 2:
The oxide coating is applied in advance to the positive electrode before assembly with the halide solid electrolyte. This preliminary protective action prevents the oxidative decomposition from occurring in the first place, rather than attempting to address the resistance increase after it happens. The coating is specifically engineered to be stable at the high operating potentials, providing preemptive protection against the harmful oxidation reactions that would increase internal resistance.
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 Li, Ti, and F in the electrolyte layer significantly enhances the charge and discharge capacity of lithium nickel manganese oxide batteries by preventing oxidative decomposition and maintaining low internal resistance.
Implementation Method 1
the electrolyte layer includes Li, Ti, M1, and F... significantly enhances the charge and discharge capacity of lithium nickel manganese oxide batteries by preventing oxidative decomposition and maintaining low internal resistance
Data Source
AI summary
The present disclosure includes: a positive electrode; a negative electrode; and an electrolyte layer disposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode active material. The positive electrode active material includes an oxide consisting of Li, Ni, Mn, and O. The electrolyte layer includes Li, Ti, M1, and F. The M1 is at least one selected from the group consisting of Ca, Mg, Al, Y, and Zr.