摘要
Li 富有的阴极材料为高精力的锂离子电池(解放) 被认为候选人同样有希望。在这研究，我们报导Li富有的材料的一个新系列(李[李<潜水艇class=“ a-plus-plus ”> 1/32x/3 </sub > Mn <潜水艇class=“ a-plus-plus ”> 2/3x/3 </sub > Ni <潜水艇class=“ a-plus-plus ”> x </sub>]O<sub class=“ a-plus-plus ”> 2 </sub>( 0.09 x 0.2 ))在解放作为阴极材料与 Ni 的小数量做了，它由于李的连续激活展出了能力增加的不平常的现象直到十个周期<潜水艇class=“ a-plus-plus ”> 2 </sub > MnO <潜水艇class= a-plus-plus > 3 </sub>阶段。试验性、计算的结果显示不同于通常学习的做 Ni 的 Li 富有的阴极材料，做的 Ni 的更小的数量能提拔逐步的李 < 潜水艇 class= “ a-plus-plus ” > 2 </sub > MnO < 潜水艇 class= “ a-plus-plus ” > 获得的 3 </sub> 激活增加了特定的能力和更好骑车的能力。相反，过多的 Ni 愿望在激活上李 < 潜水艇 class= “ a-plus-plus ” > 2 </sub > MnO < 潜水艇 class= “ a-plus-plus ” > 在在第一的大能力损失的 3 </sub> 和结果骑车。李<潜水艇class=“ a-plus-plus ”> 1.25 </sub > Mn <潜水艇class=“ a-plus-plus ”> 0.625 </sub > Ni <潜水艇class=“ a-plus-plus ”> 0.125 </sub > O <潜水艇class=“ a-plus-plus ”>有 Ni 的一个优化内容的 2 </sub>材料高交付了上级能力 280 mAh ?瀠汯??瑳特湥?潣洭污楥??€ ????????????????????楢慬敹?????搠獩潣摩污?慮潮慰瑲捩敬？？
Li-rich cathode materials have been considered as promising candidates for high-energy lithium ion batteries （LIBs）. In this study, we report a new series of Li-rich materials （Li[Li1/B-2x/BMn2/3-x/3Nix]O2 （0.09 ≤x≤ 0.2）） doped with small amounts of Ni as cathode materials in LIBs, which exhibited unusual phenomenon of capacity increase up to tens of cycles due to the continuous activation of the Li2MnO3 phase. Both experimental and computational results indicate that unlike commonly studied Ni-doped Li-rich cathode materials, smaller amounts of Ni doping can promote the stepwise Li2MnO3 activation to obtain increased specific capacity and better cycling capability. In contrast, excessive Ni will over-activate the Li2MnO3 and result in a large capacity loss in the first cycle. The Lil.25Mn0.625Ni0.12sO2 material with an optimized content of Ni delivered a superior high capacity of -280 mAh.g-1 and good cycling stability at room temperature.
