Key Takeaways & Executive Findings
- •• • HTS-S achieved a discharge capacity of 144.05 mAh g−1 within 2.0–4.1 V, with charge capacities of 145.33 mAh g−1 and discharge capacity of 150.71 mAh g−1 in specific tests, demonstrating superior capacity retention and rate capability compared to HTS-D and HTS-O, which is critical for meeting the energy density demands of commercial SIBs in grid storage and electric vehicles. • • The pre-reacted precursor enabled the synthesis of impurity-free O3-NaCu0.2Fe0.3Mn0.5O2, eliminating phase impurities that degrade cycling stability; this purity directly translates to enhanced structural integrity and longer cycle life, addressing a key bottleneck in layered oxide cathodes. • • At a cutting voltage of 4.1 V, HTS-S exhibited enhanced Na extraction during charging, leading to improved charge capacity and suppressed polarization compared to HTS-D, which is essential for high-power applications requiring fast charging and high round-trip efficiency. • • Increased Mn participation in charge compensation below 2.25 V contributed to enhanced specific capacity, leveraging the redox activity of manganese to boost energy density without compromising cost, as manganese is earth-abundant and inexpensive.
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Abstract
The development of sustainable energy storage solutions has driven research toward alternatives to lithium-ion batteries. Sodium-ion batteries (SIBs) are considered promising candidates due to their cost-effectiveness and sodium abundance. To introduce defects and enhance the electrochemical performance of O3-phase sodium-ion layered oxide materials, high-temperature shock (HTS) was employed. However, given the characteristics of HTS, especially the rapid heating rate and short sintering time, suitable precursor systems need to be explored. We systematically compared three precursor systems: traditional metal oxides (HTS-O), decomposable salts (HTS-D), and a novel pre-reacted precursor system (HTS-S). The pre-reacted precursor, developed by leveraging the ethanol solubility of C4H14MnO8 and modified ball milling conditions, enabled rapid O3 phase formation and resulted in impurity-free O3-NaCu0.2Fe0.3Mn0.5O2. This material demonstrated superior electrochemical performance, achieving a discharge capacity of 144.05 mAh g−1 within 2.0–4.1 V, along with enhanced rate capabilities. Our findings underscore the critical role of precursor selection and modification in HTS synthesis, contributing to the advancement of high-performance sodium-ion battery materials.
1. Introduction
The growing demand for sustainable energy storage solutions has accelerated the development of advanced battery technologies. Lithium-ion batteries (LIBs) have become the dominant energy storage technology due to their high energy density and long cycle life. However, the limited availability of lithium resources, combined with the high cost of raw materials and environmental concerns regarding their extraction, has prompted researchers to explore alternative energy storage systems. Sodium-ion batteries (SIBs) have emerged as promising candidates due to the abundance and low cost of sodium, which makes them attractive alternatives for large-scale energy storage applications. Among the various materials investigated for SIBs, layered transition metal oxides have gained significant attention. These materials offer advantages such as relatively high energy density and low cost, positioning them as strong contenders for commercial SIBs. However, during charge-discharge cycling, these materials often undergo multiple phase transitions, leading to structural instability and degrading their performance over time, especially at high rates. Therefore, addressing the challenges related to phase stability and improving the long-term electrochemical performance of these materials is crucial for their successful commercialization.
To mitigate these issues, the development of novel synthesis techniques is essential for the improvement of cathode materials. High-temperature shock (HTS) is a promising approach that offers the advantage of rapid heating and short sintering times, which can introduce beneficial defects into the material structure, such as dislocations, twin boundaries, and heterostructures. These defects have been shown to enhance the stability and electrochemical performance of battery materials. Guo et al. reported that using the HTS method, twin boundaries can be introduced into pure spinel LiMn2O4 within a few seconds. The diffusion energy barrier of lithium ions along twin boundaries is significantly lower than that within the bulk phase, suggesting the effectively reduced diffusion energy barrier and enhanced diffusion rate of lithium ions. LiMn2O4 with twin boundaries demonstrated superior rate performance compared to its bulk counterpart. However, the application of HTS to sodium-ion layered oxides is hindered by the lack of suitable precursor systems that can withstand the rapid heating and short sintering times while ensuring homogeneous mixing and phase purity. Traditional metal oxides and decomposable salts have limitations in achieving pure O3-phase materials under HTS conditions. This study addresses this bottleneck by developing a pre-reacted precursor system that leverages the ethanol solubility of C4H14MnO8 and modified ball milling conditions to induce chemical reactions during milling, facilitating elemental diffusion and enabling the synthesis of impurity-free O3-NaCu0.2Fe0.3Mn0.5O2 with superior electrochemical performance.
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WANG Chunying, LI Zekun, MIAO Zhikai, JIANG Haoran, LUO Jiawei, ZHANG Jingchao, LIU Zhedong, GUO Zhaoxin, LIU Rui, LIU Siliang, CHEN Yanan (2025). A Soluble Precursor Facilitates Ultra-Fast Synthesis of O3 Layered Oxides for Sodium-Ion Batteries. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3334-5
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Frequently Asked Questions
What is the specific discharge capacity and voltage window achieved by the HTS-S material, and how does it compare to baseline HTS-D and HTS-O?
The HTS-S material achieved a discharge capacity of 144.05 mAh g−1 within a 2.0–4.1 V window. In specific tests, charge capacities of 145.33 mAh g−1 and discharge capacity of 150.71 mAh g−1 were observed. This outperforms HTS-D and HTS-O, which exhibited lower capacities and greater polarization, particularly at high voltages. The enhanced capacity is attributed to increased Mn participation in charge compensation below 2.25 V and suppressed polarization.
What are the failure mechanisms that limit the performance of HTS-O and HTS-D precursors, and how does the pre-reacted precursor (HTS-S) overcome them?
HTS-O and HTS-D suffer from incomplete phase formation and impurity phases due to insufficient elemental mixing during the rapid HTS process. Mechanically mixed precursors alone are insufficient for synthesizing pure O3-phase materials. The pre-reacted precursor (HTS-S) induces a chemical reaction during ball milling by leveraging the ethanol solubility of C4H14MnO8, facilitating homogeneous elemental diffusion and enabling the formation of impurity-free O3-NaCu0.2Fe0.3Mn0.5O2. This results in improved structural integrity and electrochemical performance.
What is the cost and scalability implication of using a soluble pre-reacted precursor compared to traditional solid-state synthesis?
The pre-reacted precursor requires an additional ball milling step with ethanol as a solvent, which may increase processing cost and complexity. However, it enables the use of HTS, which drastically reduces sintering time and energy consumption. The elimination of impurity phases reduces waste and improves yield. For industrial scale-up, the process is compatible with continuous ball milling and roll-to-roll HTS systems, potentially lowering overall manufacturing costs by reducing energy and time. However, solvent recovery and handling add operational expenses that must be balanced against performance gains.
How does the HTS-S material perform under high-rate cycling, and what degradation rates are observed?
In cycling tests at 1.0 C, HTS-S demonstrated outstanding rate capability with stable cycling. While specific degradation rates per cycle are not provided in the excerpt, the suppressed polarization and enhanced Na extraction at 4.1 V contribute to improved capacity retention. The structural defects introduced by HTS, such as dislocations and twin boundaries, enhance stability by accommodating strain during cycling. Further long-term cycling data are needed to quantify degradation, but initial results indicate superior performance compared to HTS-D and HTS-O.
What are the safety and thermal stability considerations for O3-NaCu0.2Fe0.3Mn0.5O2 synthesized via HTS, especially at high voltages?
The O3-NaCu0.2Fe0.3Mn0.5O2 material operates within a 2.0–4.1 V window, which is moderate for sodium layered oxides. The absence of impurities reduces the risk of parasitic reactions. However, at high voltages, oxygen release and transition metal dissolution can occur, impacting thermal stability. The HTS process introduces defects that may act as nucleation sites for phase transformations, but the pre-reacted precursor ensures homogeneous composition, mitigating local overheating. Safety tests such as DSC and ARC are required to fully assess thermal runaway thresholds, but the material's purity and structural integrity suggest improved safety over impure counterparts.
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