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Unraveling the effects on lithium-ion cathode performance by cation doping M-Li2CuO2 solid solution samples (M = Mn,
M A Martínez-Cruz1, A Yañez-Aulestia2, G Ramos-Sánchez3
1Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, 09340, Ciudad de México, Mexico.
Dalton Transactions (Cambridge, England : 2003)
|March 21, 2020
Summary
Manganese doping significantly enhances lithium-ion battery cathode performance by improving electrochemical stability and lithium diffusion in Li2CuO2. This substitution minimizes impurities and oxygen evolution, boosting material utilization.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Cation doping is key for improving lithium-ion battery cathode materials.
- Metal ion solubility limits doping, often leading to impurities and unknown performance correlations.
- Li2CuO2 is explored as a cathode material, but its doping effects require clarification.
Purpose of the Study:
- To investigate the impact of manganese, iron, and nickel doping on Li2CuO2 cathode material.
- To understand how doping affects the electrochemical performance and structural properties of Li2CuO2.
- To identify the optimal dopant for enhancing lithium-ion battery cathode stability and functionality.
Main Methods:
- Synthesis of doped Li2CuO2 samples with varying transition metals (Mn, Fe, Ni).
- X-ray diffraction (XRD) for phase formation and profile fitting.
- Electron Paramagnetic Resonance (EPR) and 7Li-Nuclear Magnetic Resonance (NMR) for structural analysis.
- Electrochemical charge/discharge cycling, dynamic thermogravimetric analysis (TGA) for CO2 sorption, and conductivity tests.
Main Results:
- Single-phase formation confirmed for all doped Li2CuO2 samples.
- Doping induced structural modifications, altering intra- and inter-chain interactions and magnetic order.
- Manganese doping uniquely improved electrochemical stability above 3.9 V, enhancing lithium diffusivity and electronic conductivity.
- Manganese substitution reduced oxygen evolution during cycling.
Conclusions:
- Partial substitution of copper with manganese in Li2CuO2 significantly enhances electrochemical stability and performance.
- Improved stability is linked to increased superexchange interactions and reduced oxygen evolution.
- Manganese doping offers a promising strategy for advancing copper-based cathode materials for lithium-ion batteries.
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