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类石墨烯石墨用作锂离子电池的可快速充电且高容量负极材料

Graphene-Like-Graphite as Fast-Chargeable and High-Capacity Anode Materials for Lithium Ion Batteries.

作者信息

Cheng Qian, Okamoto Yasuharu, Tamura Noriyuki, Tsuji Masayoshi, Maruyama Shunya, Matsuo Yoshiaki

机构信息

IoT Devices Laboratories, NEC Corporation, Tsukuba, Ibaraki, 305-8501, Japan.

Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Himeji, Hyogo, 671-2280, Japan.

出版信息

Sci Rep. 2017 Nov 1;7(1):14782. doi: 10.1038/s41598-017-14504-8.

DOI:10.1038/s41598-017-14504-8
PMID:29093496
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5665891/
Abstract

Here we propose the use of a carbon material called graphene-like-graphite (GLG) as anode material of lithium ion batteries that delivers a high capacity of 608 mAh/g and provides superior rate capability. The morphology and crystal structure of GLG are quite similar to those of graphite, which is currently used as the anode material of lithium ion batteries. Therefore, it is expected to be used in the same manner of conventional graphite materials to fabricate the cells. Based on the data obtained from various spectroscopic techniques, we propose a structural GLG model in which nanopores and pairs of C-O-C units are introduced within the carbon layers stacked with three-dimensional regularity. Three types of highly ionic lithium ions are found in fully charged GLG and stored between its layers. The oxygen atoms introduced within the carbon layers seem to play an important role in accommodating a large amount of lithium ions in GLG. Moreover, the large increase in the interlayer spacing observed for fully charged GLG is ascribed to the migration of oxygen atoms within the carbon layer introduced in the state of C-O-C to the interlayer space maintaining one of the C-O bonds.

摘要

在此，我们提出使用一种名为类石墨烯石墨（GLG）的碳材料作为锂离子电池的负极材料，该材料具有608 mAh/g的高容量，并具备卓越的倍率性能。GLG的形态和晶体结构与目前用作锂离子电池负极材料的石墨非常相似。因此，预计它可以以与传统石墨材料相同的方式用于制造电池。基于从各种光谱技术获得的数据，我们提出了一个GLG结构模型，其中在以三维规则堆叠的碳层内引入了纳米孔和C-O-C单元对。在完全充电的GLG中发现了三种高度离子化的锂离子，并存储在其层间。碳层中引入的氧原子似乎在GLG容纳大量锂离子方面发挥着重要作用。此外，完全充电的GLG中层间距的大幅增加归因于以C-O-C状态引入的碳层内的氧原子迁移到保持其中一个C-O键的层间空间。

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