Amorphous Ni-Rich Li(Ni1-x-yMnxCoy)O2-Li2SO4 Positive Electrode Materials for Bulk-Type All-Oxide Solid-State Batteries
Amorphous Ni-Rich Li(Ni1-x-yMnxCoy)O2-Li2SO4 Positive Electrode Materials for Bulk-Type All-Oxide Solid-State Batteries
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DOI：
10.1002/admi.201802016
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发表时间：
2019-04-01
影响因子：
5.4
通讯作者：
Tatsumisago, Masahiro
中科院分区：
文献类型：
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作者：
Nagao, Kenji;Sakuda, Atsushi;Tatsumisago, Masahiro
全固态电池因其具有实现高安全性和高能量密度的储能系统的潜力而备受关注。本文报道了一种适用于氧化型全固态电池的新型非晶态正极材料LiNi1-x-yMnxCoyO2(NMC)-Li2SO4的机械力化学合成。通过Li2SO4的机械力化学处理，电极材料获得了与延性固体电解质相同的良好成形性。由于活性材料的可变形性，只需在室温下压制即可提供良好的电极/电解液界面。在采用80NMCs中心点20Li(2)SO(4)(摩尔%)正极材料的全氧化物固态电池中，电池容量随着NMC中镍含量的增加而增加。采用80NMC811中心点20Li(2)SO(4)正极活性物质制成的全固态电池在1.6-4.8V的电压范围内比100℃下的Li容量大于250mAhg(-1)。此外，块状全氧化物固体电池(Li4Ti5O12/80NMC532中心点20Li(2)SO(4)(摩尔%))成功地用作二次电池，具有良好的循环性能。
All-solid-state batteries attract significant attention owing to their potential to realize an energy storage system with high safety and energy density. In this paper, a mechanochemical synthesis of novel amorphous positive electrode materials of the Ni-rich LiNi1-x-yMnxCoyO2 (NMC)-Li2SO4 system suitable for oxide-type all-solid-state batteries is reported. Through the mechanochemical treatment with Li2SO4, excellent formabilities of the electrode materials as those of ductile solid electrolytes are obtained. Owing to the deformability of the active material, a good electrode/electrolyte interface is provided simply by pressing at room temperature. In all-oxide solid-state cells using 80NMCs center dot 20Li(2)SO(4) (mol%) positive electrode materials, the cell capacity increases with the Ni content in the NMC. The all-solid-state cell using the 80NMC811 center dot 20Li(2)SO(4) positive electrode active material exhibits a high capacity larger than 250 mAh g(-1) in a voltage range of 1.6-4.8 V versus Li at 100 degrees C. Furthermore, bulk-type all-oxide solid-state batteries (Li4Ti5O12/80NMC532 center dot 20Li(2)SO(4) (mol%)) successfully function as secondary batteries with excellent cycle performances.