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首页> 外文期刊>RSC Advances >Fabrication of high power LiNi0.5Mn1.5O4 battery cathodes by nanostructuring of electrode materials
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Fabrication of high power LiNi0.5Mn1.5O4 battery cathodes by nanostructuring of electrode materials

机译：通过电极材料的纳米结构制造高功率LINI0.5MN1.5O4电池阴极

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摘要

Using nanoparticles, instead of microparticles, as active electrode materials in lithium ion batteries could provide a solution to slow charging rates due to long ion diffusion pathways in conventional bulk materials. In this work, we present a new strategy for the synthesis of high purity lithium nickel manganese oxide (LiNi0.5Mn1.5O4) nanoparticles as a high-voltage cathode. A sonochemical reaction is used to synthesize nickel hydroxide and manganese dioxide nanoparticles followed by a solid-state reaction with lithium hydroxide. The product shows a single spinel phase and uniform spherical nano-particles under the appropriate calcination conditions. The LiNi0.5Mn1.5O4 exhibits a high voltage plateau at about 4.7-4.9 V in the charge/discharge process and delivers a discharge capacity of more than 140 mA h g(-1) and excellent cycling performance with 99% capacity retention after 70 cycles. The synthesized nano-particles show improved electrochemical performance at high rates. This electrode delivers a power density as high as 26.1 kW kg(-1) at a discharge rate of 40 C. This power performance is about one order ofmagnitude higher than traditional lithium ion batteries. These findings may lead to a new generation of high power lithiumion batteries that can be recharged in minutes instead of hours.
机译：利用纳米粒子，而不是微粒，作为活性电极材料在锂离子电池可能由于在常规散装材料长离子扩散路径提供一种解决慢速充电速率。在这项工作中，我们提出了高纯度的锂镍锰氧化物（LiNi0.5Mn1.5O4的）纳米颗粒的合成中作为高电压阴极的新策略。声化学反应来合成的氢氧化镍和二氧化锰纳米颗粒，随后用氢氧化锂的固态反应。该产品显示适当的煅烧条件下的单一的尖晶石相和均匀的球状纳米颗粒。所述LiNi0.5Mn1.5O4的在约4.7-4.9伏在充电/放电过程显示出高的电压平台，并提供70个循环后超过140毫安汞柱（-1）的放电容量和优异的循环性能以99％的容量保持。将合成的纳米颗粒显示出在高速率下改进的电化学性能。该电极提供的功率密度高达在40℃的放电速率这个功率性能是大约一个数量ofmagnitude比传统的锂离子电池高26.1千瓦公斤（-1）。这些发现可能导致新一代高功率锂离子电池，可以在几分钟内，而不是小时内完成充电。

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