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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >High-voltage spinel cathodes for lithium-ion batteries: controlling the growth of preferred crystallographic planes through cation doping
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High-voltage spinel cathodes for lithium-ion batteries: controlling the growth of preferred crystallographic planes through cation doping

机译：锂离子电池的高压尖晶石阴极：通过阳离子掺杂控制优选晶体平面的生长

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摘要

The high-voltage LiMn_(1.5)Ni_(0.5)O4 spinel cathode has become appealing for lithium-ion batteries as it offers fast, 3-dimesional Li-ion diffusion and high power. However, its commercialization is hampered by capacity fade during cycling due to the aggressive reaction between the cathode surface and the electrolyte and dissolution of the active material under the high-voltage operating conditions. We present here an. investigation of the nucleation and growth of doped co-precipitated mixed-metal hydroxide precursor particles, and the resulting stabilization of preferred crystallographic surface planes in the final spinel samples. The samples are synthesized by a coprecipitation reaction of the mixed-metal hydroxide precursors with a scalable continuously stirred tank reactor (CSTR), followed by firing with lithium hydroxide. The synthesized samples are characterized by X-ray diffraction, electron microscopy, time-of-fight - secondary ion mass spectroscopy (TOF-SIMS), and electrochemical charge-discharge measurements. It is found that doping with certain cations stabilizes the growth of low-energy (111) surface planes, facilitating a long cycle life and fast high-rate performance.
机译：高压LiMn_（1.5）Ni_（0.5）O4尖晶石阴极因其提供快速的3维Li离子扩散和高功率而吸引了锂离子电池。然而，由于在高压操作条件下阴极表面和电解质之间的剧烈反应以及活性材料的溶解，循环期间的容量衰减阻碍了其商业化。我们现在在这里。研究掺杂共沉淀的混合金属氢氧化物前体颗粒的形核和生长，以及最终尖晶石样品中优选的晶体学表面平面的稳定性。通过混合金属氢氧化物前体与可扩展的连续搅拌釜反应器（CSTR）的共沉淀反应，然后用氢氧化锂进行焙烧来合成样品。合成样品的特征在于X射线衍射，电子显微镜，飞行时间-二次离子质谱（TOF-SIMS）和电化学充放电测量。发现使用某些阳离子进行掺杂可稳定低能（111）表面的生长，从而促进长循环寿命和快速高倍率性能。

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