Co-B纳米片作为ZnCo2O4微球/纳米球中的多功能桥，可提供优异的锂存储性能，并具有增强的动力学和稳定性,Advanced Energy Materials

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.)

Co-B纳米片作为ZnCo2O4微球/纳米球中的多功能桥，可提供优异的锂存储性能，并具有增强的动力学和稳定性
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-02-21 , DOI: 10.1002/aenm.201803612
Jiaojiao Deng _{1,

2} , Xiaoliang Yu ₃ , Xianying Qin ₄ , Dong Zhou ₅ , Lihan Zhang ₁ , Huan Duan ₁ , Feiyu Kang ₁ , Baohua Li ₁ , Guoxiu Wang ₅

Affiliation

过渡金属氧化物作为下一代锂离子电池中的高能阳极具有广阔的前景。然而，由于低的电子/离子电导率和充电/放电过程中体积的巨大变化的固有局限性，制造具有令人满意的电化学性能的实用可行的紧凑且厚实的TMO阳极仍然是挑战。在此，以介孔钴硼化物纳米薄片作为ZnCo ₂ O ₄微球/纳米球中的多功能桥，构建了致密的ZnCo ₂ O ₄ / Co-B杂化结构。Co–B纳米片不仅桥接ZnCo ₂ O ₄纳米颗粒，而且还充当ZnCo ₂ O _4的锚点微/纳米球可抑制剧烈的体积波动，它们还可以作为有效的电子传导桥来促进快速的电子传输。更重要的是，它们充当Li ⁺传递桥，可显着提高Li ^+的扩散性，这从实验动力学分析和密度泛函理论计算中都可以看出。Co-B纳米薄片中的中孔有助于克服2D界面上较大的Li ⁺扩散障碍。结果，ZnCo ₂ O ₄ / Co–B电极提供了995 mAh g ^-1 / 1450 mAh cm ^-3 /5.10 mAh cm ^-2的高重量/体积/面积容量分别具有强大的速率能力和长期可循环性。独特的界面设计策略为设计紧凑的转化型阳极提供了新的方向，该阳极具有优异的锂存储动力学和稳定性，可用于实际应用。

"点击查看英文标题和摘要"

Co–B Nanoflakes as Multifunctional Bridges in ZnCo2O4 Micro‐/Nanospheres for Superior Lithium Storage with Boosted Kinetics and Stability

Transition metal oxides hold great promise as high‐energy anodes in next‐generation lithium‐ion batteries. However, owing to the inherent limitations of low electronic/ionic conductivities and dramatic volume change during charge/discharge, it is still challenging to fabricate practically viable compacted and thick TMO anodes with satisfactory electrochemical performance. Herein, with mesoporous cobalt–boride nanoflakes serving as multifunctional bridges in ZnCo₂O₄ micro‐/nanospheres, a compacted ZnCo₂O₄/Co–B hybrid structure is constructed. Co–B nanoflakes not only bridge ZnCo₂O₄ nanoparticles and function as anchors for ZnCo₂O₄ micro‐/nanospheres to suppress the severe volume fluctuation, they also work as effective electron conduction bridges to promote fast electron transportation. More importantly, they serve as Li⁺ transfer bridges to provide significantly boosted Li⁺ diffusivity, evidenced from both experimental kinetics analysis and density functional theory calculations. The mesopores within Co–B nanoflakes help overcome the large Li⁺ diffusion barriers across 2D interfaces. As a result, the ZnCo₂O₄/Co–B electrode delivers high gravimetric/volumetric/areal capacities of 995 mAh g⁻¹/1450 mAh cm⁻³/5.10 mAh cm⁻², respectively, with robust rate capability and long‐term cyclability. The distinct interfacial design strategy provides a new direction for designing compacted conversion‐type anodes with superior lithium storage kinetics and stability for practical applications.

更新日期：2019-02-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>