Lithium manganese oxyfluoride as a new cathode material exhibiting oxygen redox†,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Lithium manganese oxyfluoride as a new cathode material exhibiting oxygen redox†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-02-20 00:00:00 , DOI: 10.1039/c7ee03195e
Robert A. House _{1,

2,

3,

4} , Liyu Jin _{1,

2,

3,

4} , Urmimala Maitra _{1,

2,

3,

4} , Kazuki Tsuruta _{5,

6,

7} , James W. Somerville _{1,

2,

3,

4} , Dominic P. Förstermann _{1,

2,

3,

4} , Felix Massel _{8,

9,

10,

11,

12} , Laurent Duda _{8,

9,

10,

11,

12} , Matthew R. Roberts _{1,

2,

3,

4} , Peter G. Bruce _{1,

2,

3,

4}

Affiliation

The quantity of charge stored in transition metal oxide intercalation cathodes for Li or Na batteries is not limited by transition metal redox reactions but can also access redox reactions on O; examples include Li_1.2Ni_0.13Mn_0.54Co_0.13O₂, Li₂Ru_0.75Sn_0.25O₃, Li_1.2Nb_0.3Mn_0.4O₂, Na₂RuO₃ and Na_2/3Mg_0.28Mn_0.72O₂. Here we show that oxyfluorides can also exhibit charge storage by O-redox. We report the discovery of lithium manganese oxyfluoride, specifically the composition, Li_1.9Mn_0.95O_2.05F_0.95, with a high capacity to store charge of 280 mA h g⁻¹ (corresponding to 960 W h kg⁻¹) of which almost half, 130 mA h g⁻¹, arises from O-redox. This material has a disordered cubic rocksalt structure and the voltage–composition curve is significantly more reversible compared with ordered Li-rich layered cathodes. Unlike lithium manganese oxides such as the ordered layered rocksalt Li₂MnO₃, Li_1.9Mn_0.95O_2.05F_0.95 does not exhibit O loss from the lattice. The material is synthesised using a simple, one-pot mechanochemical procedure.

中文翻译：

氟氧化锂锰作为一种新型阴极材料，具有氧氧化还原作用†

Li或Na电池的过渡金属氧化物插层阴极中存储的电荷量不受过渡金属氧化还原反应的限制，但也可以访问O上的氧化还原反应。例子包括Li _1.2 Ni _0.13 Mn _0.54 Co _0.13 O ₂，Li ₂ Ru _0.75 Sn _0.25 O ₃，Li _1.2 Nb _0.3 Mn _0.4 O ₂，Na ₂ RuO ₃和Na _2/3 Mg _0.28 Mn _0.72 O ₂。在这里，我们证明了氟氧化物也可以通过O-redox表现出电荷存储。我们报告发现了氟氧化锂锰，特别是Li _1.9 Mn _0.95 O _2.05 F _0.95组成，其高存储容量为280 mA hg ^-1（相当于960 W h kg ^-1），其中近一半， 130 mA hg ^-1源自O-氧化还原。这种材料具有无序的立方岩盐结构，并且与有序的富锂层状阴极相比，电压-组成曲线具有更强的可逆性。与锂锰氧化物（例如有序层状岩盐Li ₂ MnO _3）不同，Li _1.9 Mn_0.95 O_2.05 F_0.95不会从晶格中表现出O损耗。该材料是使用简单的一锅机械化学方法合成的。

更新日期：2018-02-20

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11