Novel processing of lithium manganese silicate nanomaterials for Li-ion battery applications
Novel processing of lithium manganese silicate nanomaterials for Li-ion battery applications
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DOI：
10.1039/c2ra22409g
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Honma, Itaru
中科院分区：
文献类型：
--
作者：
Devaraju, Murukanahally Kempaiah;Tomai, Takaaki;Honma, Itaru
硅酸锰锂正极材料由于两种锂离子容量而受到极大关注，并且由于它们在锂嵌入和提取时的低体积变化而可以以超细纳米颗粒实现。采用超临界流体法合成了平均粒径为4-5 nm的单分散Li 2 MnSiO 4超细颗粒和分级纳米结构，并成功地显示出高的电化学性能。单分散纳米颗粒和分级纳米结构具有良好的循环性能，可实现对多个锂离子的可逆容量（190-220 mA h g（-1））。增强的循环性被发现是由于单分散纳米颗粒，其提供了一个短的长度为锂离子扩散，并具有低的体积变化。此外，还通过超临界流体工艺合成了不同尺寸的Li 2 MnSiO 4颗粒。该工艺简单、快速、节能，可广泛应用于其它功能材料。
Lithium manganese silicate positive electrode materials have received great attention because of the two lithium ion capacities and can be realized in ultrafine nanoparticles due to their low volumetric changes upon lithium insertion and extraction. A supercritical fluid process has been adopted to synthesize monodisperse Li2MnSiO4 ultrafine particles and hierarchical nanostructures with a mean particle diameter of 4-5 nm and successfully shown to attain a high electrochemical performance. A reversible capacity (190-220 mA h g(-1)) of more than one lithium ion was obtained for the ultrafine monodisperse nanoparticles and hierarchical nanostructures with good cyclability. The enhanced cyclability was found to be due to the monodisperse nanoparticles, which provide a short length for Li-ion diffusion, and possess low volumetric changes. In addition, the varyingly sized Li2MnSiO4 particles were also synthesized via a supercritical fluid process. This process is simple, rapid, energy saving and broadly applicable to other functional materials.