Solid-state lithium battery cathodes operating at low pressures
Solid-state lithium battery cathodes operating at low pressures
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DOI：
10.1016/j.joule.2022.02.008
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发表时间：
2022-03-16
期刊：
影响因子：
39.8
通讯作者：
Bruce, Peter G.
中科院分区：
文献类型：
--
作者：
Gao, Xiangwen;Liu, Boyang;Bruce, Peter G.
许多固态电池阴极研究都采用高堆压和低电流密度。在实践中，电池需要在几MPa的电堆压力下在mA cm(-2)范围内的电流密度下运行。在这里，我们展示了复合阴极成分 LiNi0.83Mn0.06Co0.11O2、Li3InCl6 和碳纳米纤维的影响，在 2-MPa 堆压下运行，并发现整体复合阴极容量主要由固体电解质的电导率决定。较高的电导率减少了从活性材料获得高容量（高利用率）所需的固体电解质的质量，从而实现了更高的活性材料负载和更高的总体容量。在 2.6 和 4.2 V（而不是 4.4 V）之间循环可将 LiNi0.83Mn0.06Co0.11O2 体积变化从 6% 降低至 2.5%，在 50 个循环后实现 94% 而不是 65% 的容量保持，容量仅减少 14%。
Many studies of solid-state battery cathodes employ high stack pressures and low current densities. In practice, cells operating at current densities in the mA cm(-2) range at stack pressures of a few MPa are required. Here, we show the influence of the composite cathode components LiNi0.83Mn0.06Co0.11O2, Li3InCl6, and carbon nanofibers, operating at 2-MPa stack pressure and find that the overall composite cathode capacity is determined primarily by the conductivity of the solid electrolyte. Higher conductivities reduce the mass of the solid electrolyte required to access a high capacity from the active material (high utilization), enabling higher active material loadings and higher overall capacities. Cycling between 2.6 and 4.2 V rather than 4.4 V reduces the LiNi0.83Mn0.06Co0.11O2 volume change from 6% to 2.5%, achieving 94% rather than 65% capacity retention after 50 cycles for a reduction in capacity of only 14%.