当前位置: X-MOL 学术Adv. Energy Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Ni‐Rich Layered Cathode Materials with Electrochemo‐Mechanically Compliant Microstructures for All‐Solid‐State Li Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-19 , DOI: 10.1002/aenm.201903360
Sung Hoo Jung 1 , Un‐Hyuck Kim 1 , Jae‐Hyung Kim 1 , Seunggoo Jun 1 , Chong S. Yoon 2 , Yoon Seok Jung 1 , Yang‐Kook Sun 1
Affiliation  

While Ni‐rich cathode materials combined with highly conductive and mechanically sinterable sulfide solid electrolytes are imperative for practical all‐solid‐state Li batteries (ASLBs), they suffer from poor performance. Moreover, the prevailing wisdom regarding the use of Li[Ni,Co,Mn]O2 in conventional liquid electrolyte cells, that is, increased capacity upon increased Ni content, at the expense of degraded cycling stability, has not been applied in ASLBs. In this work, the effect of overlooked but dominant electrochemo‐mechanical on the performance of Ni‐rich cathodes in ASLBs are elucidated by complementary analysis. While conventional Li[Ni0.80Co0.16Al0.04]O2 (NCA80) with randomly oriented grains is prone to severe particle disintegration even at the initial cycle, the radially oriented rod‐shaped grains in full‐concentration gradient Li[Ni0.75Co0.10Mn0.15]O2 (FCG75) accommodate volume changes, maintaining mechanical integrity. This accounts for their different performance in terms of reversible capacity (156 vs 196 mA h g−1), initial Coulombic efficiency (71.2 vs 84.9%), and capacity retention (46.9 vs 79.1% after 200 cycles) at 30 °C. The superior interfacial stability for FCG75/Li6PS5Cl to for NCA80/Li6PS5Cl is also probed. Finally, the reversible operation of FCG75/Li ASLBs is demonstrated. The excellent performance of FCG75 ranks at the highest level in the ASLB field.

中文翻译:

全固态锂电池具有电化学机械兼容微结构的富镍分层阴极材料

虽然富镍正极材料与高导电性和机械可烧结的硫化物固体电解质相结合对于实用的全固态锂电池(ASLB)来说是必不可少的,但它们的性能却很差。此外,关于在传统的液体电解质电池中使用Li [Ni,Co,Mn] O 2的普遍观点,即在Ni含量增加时增加容量,但以降低循环稳定性为代价,尚未在ASLB中应用。在这项工作中,通过互补分析阐明了被忽视但占主导地位的电化学机制对ASLBs中富Ni阴极性能的影响。而传统的Li [Ni 0.80 Co 0.16 Al 0.04 ] O 2(NCA80)具有随机取向的晶粒,甚至在初始循环时也容易发生严重的崩解,全浓度梯度的Li [Ni 0.75 Co 0.10 Mn 0.15 ] O 2(FCG75)径向取向的棒状晶粒可适应体积变化,保持机械完整性。这解释了它们在30°C下的可逆容量(156 vs 196 mA hg -1),初始库仑效率(71.2 vs 84.9%)和容量保持率(200个循环后46.9 vs 79.1%)方面的不同性能。对于FCG75 /锂上级界面稳定6 PS 5氯为NCA80 /锂6 PS 5还探测了Cl。最后,展示了FCG75 / Li ASLB的可逆操作。FCG75的出色性能在ASLB领域中排名最高。
更新日期:2020-02-11
down
wechat
bug