用于锂储存的金属有机骨架衍生的LiFePO4/C复合材料：原位构建、有效开发和定向修复,EcoMat

当前位置： X-MOL 学术 › EcoMat › 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.)

用于锂储存的金属有机骨架衍生的LiFePO4/C复合材料：原位构建、有效开发和定向修复
EcoMat ( IF 10.7 ) Pub Date : 2023-09-29 , DOI: 10.1002/eom2.12415
Yilin Li ₁ , Ziqiang Fan ₁ , Zhijian Peng ₁ , Zhaohui Xu ₂ , Xinyu Zhang ₁ , Jian‐En Zhou ₁ , Xiaoming Lin ₁ , Zhenyu Wu ₁ , Enyue Zhao ₃ , Ronghua Zeng ₁

Affiliation

迄今为止，LiFePO ₄ (LFP)的瓶颈在于较差的电子电导率和缓慢的Li ⁺扩散，这可以通过阳离子掺杂、形态工程、碳涂层等来解决。在这些方法中，形态优化和碳改性可以保证稳定的工作电压并延长循环寿命，这可以通过利用金属有机框架作为自我牺牲模板来实现。在此，我们构思了一种策略，以普鲁士蓝类似物为模板，原位构建氮掺杂碳涂层LFP，之后电化学测试广泛利用了在0.5 C下循环500次后锂存储容量为153.2 mAh g -1 ^{。，与不可避免的Li}⁺损失和碳层破坏相关的容量失效为长期循环后LFP的恢复提供了足够的空间。受此启发，研究了使用 3,4-二羟基苯甲腈二锂盐进行靶向修复后 LFP/C 的电池性能，结果表明，由于恢复性 LFP 晶体和具有均匀氮分布的均匀碳层，具有相当大的恢复容量。计算研究还支持氮掺杂碳层在 LFP 改性中的可行性。这项研究设想了一种从定向制造到定向回收的 LFP 性能改进方法，为 LIB 阴极的制造和再利用提供了见解。

"点击查看英文标题和摘要"

Metal–organic framework-derived LiFePO4/C composites for lithium storage: In situ construction, effective exploitation, and targeted restoration

Hitherto, LiFePO₄ (LFP) is bottlenecked by inferior electronic conductivity and sluggish Li⁺ diffusion, which can be resolved by cation doping, morphological engineering, carbon coating, and so forth. Among these methodologies, morphological optimization and carbon modification can warrant a stable operating voltage and prolong the cycling lifespan, which can be accessible by utilizing metal–organic frameworks as self-sacrificing templates. Herein, we conceptualize a strategy to in-situ construct N-doped carbon-coated LFP with Prussian blue analogues as the template, after which electrochemical tests extensively exploit the lithium storage capacity with 153.2 mAh g⁻¹ after 500 cycles at 0.5 C. However, the capacity failure associated with the inevitable Li⁺ loss and destructed carbon layer provides sufficient room for the restoration of LFP after long-term cycling. Motivated by this, the cell performance of LFP/C after targeted restoration using the 3,4-dihydroxybenzonitrile dilithium salt is investigated, revealing a considerable recovered capacity due to the recuperative LFP crystal and uniform carbon layer with homogeneous N-distribution. The computational study also supports the feasibility of N-doped carbon layer in LFP modification. This study envisages a methodology for the performance improvement of LFP from directional fabrication to targeted recovery, providing insights into the manufacturing and reuse of LIB cathodes.

更新日期：2023-09-29

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文