Investigating Dopants to Improve Sintered LiMn2O4 Spinel Electrode Electrochemical Cycling Limitations
Investigating Dopants to Improve Sintered LiMn2O4 Spinel Electrode Electrochemical Cycling Limitations
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DOI：
10.1016/j.electacta.2021.139484
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发表时间：
2021-10
影响因子：
6.6
通讯作者：
C. Cai;Gary M. Koenig
中科院分区：
文献类型：
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作者：
C. Cai;Gary M. Koenig
锂离子电池已经成为便携式储能的主流。为了继续提高电池的能量密度，设计电极结构可以提供关于能量和功率密度的改进。不含钝化添加剂的烧结电极可获得高达150 mg以上的电活性物质Cm−2，但随着电极负载和厚度的增加，它们具有电子和/或离子传输阻力限制。本文对LiMn2O4作为烧结型电极正极材料进行了研究。LiMn2O4是一种相对低成本和无钴的阴极选择，但其相对较低的电子传导性和由于Jahn-Teller扭曲和/或锰溶解而导致的衰退构成了挑战，相对于复合材料，烧结电极的挑战加剧了这一点。因此，我们研究了掺杂剂LiMn2-xMxO4的掺入，其中Me=Cu2或Al(单独或组合)，x从0到0.15，以了解材料的电子传导性和结构稳定性的改变对由这些材料组成的烧结电极的影响。这两种掺杂剂的加入改善了烧结电极的电化学结果。
Lithium-ion batteries have become prevalent for portable energy storage. Towards continuing to increase the energy density of batteries, engineering the electrode structure can provide improvements with regards to energy and power density. Sintered electrodes, which have no inactive additives, can achieve high areal loadings of over 150 mg electroactive material cm−2, however, they have electronic and/or ionic transport resistance limitations as the electrode loadings and thicknesses increase. Herein, LiMn2O4was investigated as a sintered electrode cathode material. LiMn2O4is attractive as a relatively low cost and Co-free cathode option, but its relatively low electronic conductivity and fading due to Jahn-Teller distortion and/or manganese dissolution pose challenges that are exacerbated in sintered electrodes relative to composites. Thus the incorporation of dopants LiMn2-xMxO4, where M = Cu or Al (in isolation or combination) and x ranged from 0 to 0.15, were investigated to understand how modifications to the material electronic conductivity and structural stability would impact sintered electrodes comprised of these materials. Improvement in sintered electrode electrochemical outcomes was observed for incorporation of both dopants.