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Safety requirements stimulate Na-based batteries to evolve from high-temperature Na–S batteries to room-temperature Na-ion batteries(NIBs).Even so,NIBs may still cause thermal runaway due to the external unexpected accidents and internal high activity of electrodes or electrolytes,which has not been comprehensively summarized yet.In this review,we summarize the significant advances about the failure mechanisms and related strategies to build safer NIBs from the selection of electrodes,electrolytes and the construction of electrode/electrolyte interfaces.Considering the safety risk,the thermal behaviors are emphasized which will deepen the understanding of thermal stability of different NIBs and accelerate the exploitation of safe NIBs. 相似文献
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Yuejun Ding 《中国物理 B》2022,31(6):68201-068201
Na-ion batteries (NIBs) are regarding as the optimum complement for Li-ion batteries along with the rapid development of stationary energy storage systems. In order to meet the commercial demands of cathodes for NIBs, O3-type Cu containing layered oxide Na0.90Cu0.22Fe0.30Mn0.48O2 with good comprehensive performance and low-cost element components is very promising for the practical use. However, only part of the Cu3+/Cu2+ redox couple participated in the redox reaction, thus impairing the specific capacity of the cathode materials. Herein, Mg2+-doped O3-Na0.90Mg0.08Cu0.22Fe0.30Mn0.40O2 layered oxide without Mn3+ was synthesized successfully, which exhibited improved reversible specific capacity of 118 mAh/g in the voltage range of 2.4-4.0 V at 0.2 C, corresponding to the intercalation/deintercalation of 0.47 Na+ (0.1 more than that of Na0.90Cu0.22Fe0.30Mn0.48O2). This work demonstrates an important strategy to obtain advanced layered oxide cathodes for NIBs. 相似文献
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Spinel lithium titanate (Li4Ti5O12) as novel anode material for room-temperature sodium-ion battery 下载免费PDF全文
This is the first time that a novel anode material, spinel Li4Ti5O12 which is well known as a “zero-strain” anode material for lithium storage, has been introduced for sodium-ion battery. The Li4Ti5O12 shows an average Na storage voltage of about 1.0 V and a reversible capacity of about 145 mAh/g, thereby making it a promising anode for sodium-ion battery. Ex-situ X-ray diffraction (XRD) is used to investigate the structure change in the Na insertion/deinsertion process. Based on this, a possible Na storage mechanism is proposed. 相似文献
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A novel transparent and soft quasi-solid-state electrolyte(QSSE) was proposed and fabricated, which consists of ionic liquid(PYR_(14)TFSI) and nano-fumed silica. The QSSE demonstrates high ionic conductivity of 4.6×10~(-4) S/cm at room temperature and wide electrochemical stability window of over 5 V. The Li–O_2 battery using such quasi-solidstate electrolyte exhibits a low charge-discharge overpotential at the first cycle and excellent long-term cyclability over 500 cycles. 相似文献
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Layered oxides of P2-type Nao.68Cuo.34Mno.6602, P2-type Nao.68Cuo.34Mno.50Tio.1602, and O'3-type NaCuo.67Sbo.3302 were synthesized and evaluated as cathode materials for room-temperature sodium-ion batteries. The first two materials can deliver a capacity of around 70 mAh/g. The Cu2+ is oxidized to Cu3+ during charging, and the Cu3+ goes back to Cu2+ upon discharging. This is the first demonstration of the highly reversible change of the redox couple of Cu2+/Cu3+ with high storage potential in secondary batteries. 相似文献
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Highly Emcient Dye-Sensitized Solar Cells Using a Composite ElectrolyteConsisting of LiI(CH3OH)4-I2, SiO2 Nano-Particles and an Ionic Liquid 下载免费PDF全文
Solid-state electrolyte LiI(CH3OH)4-I2 is used in dye-sensitized solar cells (DSSCs). The DSSCs using only the LiI(CH3OH)4-I2 electrolyte show very poor performance due to the quick crystal growth of LiI(CH3OH)4. In order to improve the performance of DSSCs, we prepare a composite electrolyte by adding Si02 nano-particles and an ionic liquid, 1-methyl-3-ethylimidazolium iodide, into the original solid-state electrolyte. High efficiency of 4.3% is achieved by applying this composite electrolyte to DSSCs. 相似文献
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水系碱金属离子电池因具有高安全性、低成本和环境友好等优势而成为前沿研究的热点之一,在大规模储能领域具有良好的应用前景.然而,许多水系碱金属离子电池在低温条件下出现运行故障或展现出极低的放电比容量,严重限制了其在恶劣的严寒气候条件下的广泛应用.本综述首先梳理了近年来低温水系碱金属离子电池的研究进展.随后从电解液、电极和界面三个方面分别探讨了水系碱金属离子电池在低温下运行所面对的挑战和相应的失效机制,同时系统地介绍了提高电池低温性能的改性策略并加以评述,以期为水系碱金属离子电池低温性能的进一步提升及其实际应用提供参考并指明方向. 相似文献
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The high-temperature β-phase NaMnO_2 is a promising material for Na-ion batteries(NIBs) due to its high capacity and abundant resources. However, the synthesis of phase-pure -NaMnO_2 is burdensome and costineffective because it needs to be sintered under oxygen atmosphere at high temperature and followed by a quenching procedure. Here we first report that the pure β phase can be stabilized by Cu-doping and easily synthesized by replacing a proportion of Mn with Cu via a simplified process including sintering in air and cooling to room temperature naturally. Based on the first-principle calculations, the band gap decreases from 0.7 eV to 0.3 eV, which indicates that the electronic conductivity can be improved by Cu-doping. The designed -NaCu_(0.1)Mn_(0.9)O_2 is applied as cathode in NIBs, exhibiting an energy density of 419 Wh/kg and better performance in terms of rate capability and cycling stability than those in the undoped case. 相似文献
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钠离子电池近年来在大规模储能领域展现出优异的发展和应用前景.由于钠离子层状过渡金属氧化物正极材料(NaxTMO2)具有比容量高、容易制备、电压可调和成本低的优势,在学术界和产业界得到了广泛的关注与研究.但较大的Na~+半径和较强的Na~+-Na~+静电排斥作用,导致NaxTMO2具有多种结构类型和复杂的结构转变,以及由此形成了多重结构-性能关系.本文详细介绍了NaxTMO2的结构类型,综述了在Na~+脱出/嵌入过程中引发的结构演变,旨在揭示钠离子层状过渡金属氧化物正极材料结构转变机理及其对电化学性能的影响,最后讨论了现存的挑战并提出了改进策略. 相似文献