Alternate heterogeneous superlattice control of lattice strain to stabilize Li-rich cathode,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 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.)

Alternate heterogeneous superlattice control of lattice strain to stabilize Li-rich cathode
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2023-09-22 , DOI: 10.1039/d3ee01318a
Ying Zhang _{1,

2} , Xiaoyu Shi _{1,

3} , Shuanghao Zheng _{1,

3} , Yuguo Ouyang _{1,

4} , Mingrun Li _{1,

3} , Caixia Meng _{1,

3,

5} , Yan Yu ₆ , Zhong-Shuai Wu _{1,

3}

Affiliation

Li-rich oxides (LROs) working on a synergy of cation and anion redox can deliver greater energy density than that of commercial cathode materials. However, the lattice strain and structural collapse caused by lithium-ion (de)intercalation that accumulate ceaselessly during cycling (especially in a high-voltage region) generate fast decay in performance. We constructed a layered-spinel alternate heterostructure to alleviate the structural evolution of LROs caused by lattice strain. This strategy was achieved with the aid of an anchoring effect from the spinel phase and combination with an Al₂O₃ surface coating to prevent transition-metal dissolution of LROs. These optimized Li-rich materials achieved an initial Coulombic efficiency of ∼100%, high first-cycle specific discharge capacity of 307 mA h g⁻¹, and significantly improved cycle stability with 84% capacity retention after 200 cycles, thereby outperforming most LROs reported previously. Therefore, this synergistic strategy of an alternate heterostructure and surface coating could help to solve the electrochemical decay caused by lattice strain for the commercial application of LROs.

中文翻译：

晶格应变的交替异质超晶格控制以稳定富锂阴极

富锂氧化物（LRO）通过阳离子和阴离子氧化还原的协同作用，可以提供比商业正极材料更高的能量密度。然而，在循环过程中（特别是在高电压区域）不断积累的锂离子（脱）嵌引起的晶格应变和结构崩溃会导致性能快速衰减。我们构建了层状尖晶石交替异质结构，以减轻由晶格应变引起的 LRO 结构演化。该策略是借助尖晶石相的锚定效应以及与 Al ₂ O _{3的结合来实现的。}表面涂层可防止 LRO 的过渡金属溶解。这些优化的富锂材料实现了~100%的初始库仑效率、307 mA hg ^-1的高首次循环比放电容量，并显着提高了循环稳定性，200次循环后容量保持率为84%，从而优于之前报道的大多数LRO 。因此，这种交替异质结构和表面涂层的协同策略有助于解决LRO商业应用中晶格应变引起的电化学衰减问题。

更新日期：2023-09-22

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南