Micron-sized single-crystal cathodes for sodium-ion batteries.
Micron-sized single-crystal cathodes for sodium-ion batteries.
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DOI：
10.1016/j.isci.2022.104205
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发表时间：
2022-05-20
期刊：
影响因子：
5.8
通讯作者：
Reddy, M. Anji
中科院分区：
文献类型：
--
作者：
Pamidi, Venkat;Trivedi, Shivam;Behara, Santosh;Fichtner, Maximilian;Reddy, M. Anji
将颗粒-电解质相互作用限制在电极材料中的颗粒表面对于开发可持续和安全的电池至关重要。纳米尺寸的单晶颗粒提供了这样的机会。由于减小的表面积和晶粒边界自由的核心，微米尺寸的单晶颗粒中的颗粒-电解质相互作用将被限制在颗粒表面。在这里，我们揭示了这种材料在钠离子电池中的潜力。我们合成并研究了钠离子电池正极材料Na0.7Mn0.9Mg0.1O2的化学、电化学和热性能。单晶Na_（0.7）Mn_（0.9）Mg_（0.1）O_2平均粒径为8.1 μm，具有较高的循环稳定性和电压稳定性。此外，由充电的单晶Na0.7Mn0.9Mg0.1O2阴极释放的放热比相应的多晶Na0.7Mn0.9Mg0.1O2低四倍。这显著增强了电极材料的热稳定性，并可能减轻电池中的热失控。令人惊讶的是，Na0.7Mn0.9Mg0.1O2的单晶在水和环境气氛中相对稳定。研究了P2-Na0.7Mn0.9Mg0.1O2的微米级单晶（MSSC）用于SIBs，与多晶样品相比，它们表现出高循环和电压稳定性，放热比多晶样品低四倍MSSC阴极在空气和水中表现出更高的稳定性电化学;能源系统;材料科学
Confining the particle-electrolyte interactions to the particle surface in electrode materials is vital to develop sustainable and safe batteries. Micron-sized single-crystal particles offer such opportunities. Owing to the reduced surface area and grain boundary-free core, particle-electrolyte interactions in micron-sized single-crystal particles will be confined to the particle surface. Here, we reveal the potential of such materials in sodium-ion batteries. We synthesized and investigated the chemical, electrochemical, and thermal properties of single-crystalline P2-type Na0.7Mn0.9Mg0.1O2 as a cathode material for sodium-ion batteries. Single-crystalline Na0.7Mn0.9Mg0.1O2 with a mean particle size of 8.1 μm exhibited high cycling and voltage stability. In addition, the exothermic heat released by the charged single-crystal Na0.7Mn0.9Mg0.1O2 cathodes was four times lower than that of the corresponding polycrystalline Na0.7Mn0.9Mg0.1O2. This significantly enhances the thermal stability of electrode materials and possibly mitigates thermal runaways in batteries. Surprisingly, single crystals of Na0.7Mn0.9Mg0.1O2 were relatively stable in water and ambient atmosphere. Micron-sized single crystals (MSSC) of P2-Na0.7Mn0.9Mg0.1O2 were investigated for SIBs They showed high cycling and voltage stability compared to the polycrystalline sample Exhibited four times lower exothermic heat evolution than the polycrystalline sample MSSC cathode showed higher stability in air and water Electrochemistry; Energy systems; Materials science
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