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首页> 外文会议>8th Asian Conference on Solid State Ionics: Trends in the New Millennium; Dec 15-19, 2002; Langkawi, Malaysia >Layered Li-Mn-M-oxides as cathodes for Li-ion batteries: Recent trends
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Layered Li-Mn-M-oxides as cathodes for Li-ion batteries: Recent trends

机译：层状Li-Mn-M-氧化物作为锂离子电池的阴极：近期趋势

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摘要

There is an increasing demand for manganese (Mn) based mixed oxides which can effectively replace the presently used LiCoO_2 as cathode in Li-ion batteries (LIB). The well-studied spinel, LiMn_2O_4 and its doped derivatives give a capacity of 100-120 mAh/g, but show capacity-fading on cycling especially above 55℃. The layered LiMnO_2, isostructural to LiCoO_2 (so called O3-structure) can be a viable cathode. However, studies have shown that it undergoes conversion to spinel structure on cycling and thus gives capacity-fading. Other alternative systems recently studied are: O2-structured layered Li-M-Mn-oxides with the general formula Li_((2/3)+x)(M_yMn_(1-y))O_2, M=Li, Ni, Co; x≤0.33 and y=0.1-0.67, 03-Li(Ni_(1/2)Mn_(1/2))O_2, Li(Ni_xCo_(1-2x)Mn_x)O_2, and M'-substituted Li_2MnO_3 (M'=Ni, Co, Cr). Some of them are shown to have stable cycling performance, good rate-capability and structural stability over charge-discharge cycling in the 2.5-4.6 V region. Further, the electrochemical processes in the above mixed oxides have been shown to involve Ni~(2+/4+) or Cr~(3+/6+) redox couple, thus invoking novel ideas to develop new cathode materials. A brief review of the work done on the above O2- and 03-layered Li-Mn-M-oxides (M=metal) as cathodes for LIB is presented.
机译：可以有效替代目前使用的LiCoO_2作为锂离子电池（LIB）阴极的锰（Mn）基混合氧化物的需求不断增长。经过充分研究的尖晶石LiMn_2O_4及其掺杂的衍生物的容量为100-120 mAh / g，但在循环中表现出衰减，尤其是在55℃以上时。与LiCoO_2同构的层状LiMnO_2（所谓的O3-结构）可以是可行的阴极。但是，研究表明，它在循环过程中会转变为尖晶石结构，从而导致容量衰减。最近研究的其他替代系统是：具有通式Li _（（2/3）+ x）（M_yMn_（1-y））O_2，M = Li，Ni，Co的O2结构的层状Li-M-Mn-氧化物； x≤0.33且y = 0.1-0.67、03-Li（Ni_（1/2）Mn_（1/2））O_2，Li（Ni_xCo_（1-2x）Mn_x）O_2和M'-取代的Li_2MnO_3（M' = Ni，Co，Cr）。它们中的一些在2.5-4.6 V区域内的充放电循环中显示出稳定的循环性能，良好的倍率能力和结构稳定性。此外，上述混合氧化物中的电化学过程已显示涉及Ni〜（2 + / 4 +）或Cr〜（3 + / 6 +）氧化还原对，从而激发了开发新阴极材料的新思路。简要回顾了上述O2和03层Li-Mn-M-氧化物（M =金属）作为LIB阴极所做的工作。

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