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Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
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High-Capacity Layered-Spinel Cathodes for Li-Ion Batteries
Prasant Kumar Nayak1, Elena Levi1, Judith Grinblat1
1Department of Chemistry, Bar-Ilan University, Ramat-Gan, 5290002, Israel.
Chemsuschem
|August 18, 2016
Summary
Li and Mn-rich layered oxides offer high capacity for Li-ion batteries but face challenges. New composite cathode materials demonstrate high specific capacity and good cycling stability, paving the way for commercialization.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium and manganese-rich layered oxides are promising Li-ion battery cathode materials due to their high specific capacity (>250 mA h g⁻¹).
- Commercialization is hindered by issues like irreversible capacity loss, capacity fading, poor rate capability, and discharge voltage decay.
- Voltage decay is linked to layered-to-spinel structural transformation during cycling in wide potential ranges (>4.5 V to <3 V vs. Li).
Purpose of the Study:
- To develop high-capacity composite cathode materials for Li-ion batteries.
- To investigate Li and Mn-rich layered-spinel materials with improved electrochemical performance.
- To explore the impact of constituent phases on specific capacity, cycling stability, average discharge voltage, and rate capability.
Main Methods:
- Synthesis of composite cathode materials using four-element systems (Li, Mn, Ni, O) with specific stoichiometry.
- Electrochemical evaluation of LiMn1.5Ni0.5O4 and LixMnyNizO2 components within layered-spinel structures.
- Analysis of cycling performance, capacity retention, and rate capability in a wide potential domain (2.4–4.9 V).
Main Results:
- Achieved high specific capacity (≥200 mA h g⁻¹) in Li and Mn-rich layered-spinel cathode materials.
- Demonstrated good capacity retention upon cycling within a broad electrochemical window.
- Identified promising electrochemical performance, including high specific capacity, high rate capability, and cycle life.
- Highlighted the advantage of cobalt-free compositions.
Conclusions:
- Composite cathode materials based on Li and Mn-rich layered-spinel structures offer a viable solution to overcome limitations of traditional layered oxides.
- These materials exhibit excellent electrochemical properties, including high capacity and stability, making them suitable for advanced Li-ion batteries.
- The development of cobalt-free options presents an environmentally and economically advantageous pathway for next-generation energy storage.
