[Chemical Engineering Journal] 我室董全峰教授发表论文:A Highly Reversible Glass-Fiber-Based Flexible Lithium Anode via Embedding Lithophilic Cobalt Quantum Dots

发布日期:2021年12月08日   浏览次数:

我室董全峰教授在 Chemical Engineering Journal 上发表论文:A Highly Reversible Glass-Fiber-Based Flexible Lithium Anode via Embedding Lithophilic Cobalt Quantum Dots

摘要:Nonconducting textile materials will be the skeleton of electrode for flexible battery in growing widespread applications in portable and wearable electronics, a fiber-based lithium anode is facing more challenges and has more important sense. Herein, a glass fiber was employed as supporting skeleton on which the nitrogen-doped carbon nanoflake array has been modified first to form a conductive layer, then the cobalt quantum dots were embedded in the layer to establish lithophilic sites, finally, a unique glass-fiber-based lithium anode (GFLA) has been achieved. Furthermore, the cross-linked fiber framework not only dramatically lessen the local current density, but the richer cavity also greatly alleviates the volume expansion problem. Thus, the GFLA electrode demonstrated a highly reversible and stable long-term cycling behavior with nondendritic. As expected, the GFLA electrode exhibits a high CE (∼98.64%) at 0.5 mA cm−2 upon 1480 h in half-cell and a durable cycling with a small voltage hysteresis (20 mV) for 470 h at 4 mA cm−2/4 mAh cm−2 in symmetrical-cell. Moreover, the GFLA@Li||LiFePO4 full-cell displays a capacity retention rate of up to 90.3% after 400 cycles, while the carbon fiber@Li||LiFePO4 is only 36.4%.

文章链接:https://www.sciencedirect.com/science/article/pii/S1385894721054796