Growing vertical graphene sheets on natural graphite for fast charging lithium-ion batteries
Growing vertical graphene sheets on natural graphite for fast charging lithium-ion batteries
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DOI：
10.1016/j.carbon.2020.11.027
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发表时间：
2021-03-01
期刊：
影响因子：
10.9
通讯作者：
Yu, Jie
中科院分区：
文献类型：
--
作者：
Mu, Yongbiao;Han, Meisheng;Yu, Jie
为了满足电动汽车用锂离子电池的快速充电和高能量密度需求，人们一直在追求在保持高能量密度的同时，极快充电时间在15分钟以内的目标，这仍然是一个挑战。为了实现这一目标，采用热化学气相沉积的方法在石墨表面生长垂直石墨烯薄膜。垂直石墨烯薄膜不仅由于其固有的高导电性而大大提高了锂离子的传输速率，而且由于其高度优先的锂离子插入路径而显著地降低了锂离子传输的曲折程度。在半电池中，垂直的石墨烯片/石墨可以在每个循环3分钟的充电时间下耐受3000次循环。更值得注意的是，垂直石墨烯/石墨片/石墨负极和LiFePO4正极的全电池在4℃下每循环10分钟充电10min的超高能量密度为312.1 Wh kg(-1)，表明垂直石墨烯/石墨片/石墨负极在保持高能量密度的同时具有极快充电的能力。(C)2020爱思唯尔有限公司。保留所有权利。
A goal of extreme fast charging less than 15 min recharge time while maintaining high energy density has been pursued to meet fast-charging and high-energy-density demand on lithium ion batteries used in electric vehicles, which is still a challenge. Here, in order to realize the goal vertical graphene sheets are grown on surface of graphite by thermal chemical vapor deposition. The vertical graphene sheets not only can greatly boost lithium-ion transport rate due to its intrinsically high electrical conductivity but also can significantly reduce tortuosity of lithium ion transport due to its highly preferential lithium-ion insertion paths. In half cells, the vertical graphene sheets/graphite can endure 3000 cycles in 3 min of charge time per cycle. More remarkably, a full cell with vertical graphene sheets/graphite anode and LiFePO4 cathode exhibits an ultrahigh energy density of 312.1 Wh kg(-1) in 10 min of charge time per cycle at 4 C, indicating that the vertical graphene sheets/graphite anode possesses ability of extreme fast charging while maintaining high energy density. (C) 2020 Elsevier Ltd. All rights reserved.