Lu Lei-Lei, Lu Yu-Yang, Zhu Zheng-Xin, Shao Jia-Xin, Yao Hong-Bin, Wang Shaogang, Zhang Tian-Wen, Ni Yong, Wang Xiu-Xia, Yu Shu-Hong
Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Department of Chemistry, Department of Applied Chemistry, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, China.
Sci Adv. 2022 Apr 29;8(17):eabm6624. doi: 10.1126/sciadv.abm6624. Epub 2022 Apr 27.
Extremely fast-charging lithium-ion batteries are highly desirable to shorten the recharging time for electric vehicles, but it is hampered by the poor rate capability of graphite anodes. Here, we present a previously unreported particle size and electrode porosity dual-gradient structure design in the graphite anode for achieving extremely fast-charging lithium ion battery under strict electrode conditions. We develop a polymer binder-free slurry route to construct this previously unreported type particle size-porosity dual-gradient structure in the practical graphite anode showing the extremely fast-charging capability with 60% of recharge in 10 min. On the basis of dual-gradient graphite anode, we demonstrate extremely fast-charging lithium ion battery realizing 60% recharge in 6 min and high volumetric energy density of 701 Wh liter at the high charging rate of 6 C.
极快充电的锂离子电池对于缩短电动汽车的充电时间非常有必要，但它受到石墨负极倍率性能差的阻碍。在此，我们提出了一种先前未报道的石墨负极粒径和电极孔隙率双梯度结构设计，以在严格的电极条件下实现极快充电的锂离子电池。我们开发了一种无聚合物粘结剂的浆料路线，以在实际的石墨负极中构建这种先前未报道的粒径-孔隙率双梯度结构，该结构在10分钟内可实现60%的充电，展现出极快充电能力。基于双梯度石墨负极，我们展示了极快充电的锂离子电池，在6C的高充电速率下，6分钟内可实现60%的充电，且具有701瓦时/升的高体积能量密度。
