Through-hole graphite made from waste graphite for high-rate lithium-ion battery anodes,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 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.)

Through-hole graphite made from waste graphite for high-rate lithium-ion battery anodes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-02-02 , DOI: 10.1039/d2ta09965a
ShanLin Gao _{1,

2} , Lv Yan _{1,

2} , Jieming Qin _{1,

2} , Rui Liu ₁ , Benkuan Liang ₁ , Qi Wang ₁ , Mingchen Geng ₁ , Bo Wang ₁

Affiliation

The cost of high-performance artificial graphite has been increasing in recent years, while low-cost natural graphite has also been listed as a supply-risk material. Therefore, finding a new supply chain to alleviate the above problems is urgent. Herein, we designed a simple combined process involving high-temperature oxidation and magnetic separation, where the optimum temperature was 480 °C. The waste graphite (DSG) from diamond production was converted into a through-hole graphite material (denoted as MDSG-480). MDSG-480 exhibited superior rate performance and long-cycle stability compared with natural flaky graphite (NFG). In particular, the reversible capacity could reach 125 mA h g⁻¹ after 1200 cycles at 5C, which is seven times more than that of natural flaky graphite (NFG). The outstanding performance of MDSG-480 was attributed to the through-hole, which served as a container for the electrolyte on the graphite surface and shortened the distance between the lithium ion and graphite layer as well as the diffusion path within the electrode. Moreover, this study proves that through-hole graphite can reduce the initial potential of the electrode under high current density and the feasibility of manufacturing high-performance graphite anode with DSG.

中文翻译：

高倍率锂离子电池负极废石墨制通孔石墨

近年来，高性能人造石墨的成本不断上涨，而低成本的天然石墨也被列为供应风险材料。因此，寻找新的供应链来缓解上述问题迫在眉睫。在此，我们设计了一个简单的高温氧化和磁分离组合工艺，最佳温度为 480 °C。将金刚石生产中的废石墨（DSG）转化为通孔石墨材料（记为MDSG-480）。与天然鳞片石墨 (NFG) 相比，MDSG-480 表现出优异的倍率性能和长循环稳定性。特别是，可逆容量可以达到 125 mA hg ⁻¹在 5C 下循环 1200 次后，比天然鳞片石墨 (NFG) 高 7 倍。MDSG-480的出色性能归功于通孔，它作为石墨表面电解质的容器，缩短了锂离子与石墨层之间的距离以及电极内的扩散路径。此外，该研究证明了通孔石墨可以降低高电流密度下电极的初始电位，以及用DSG制造高性能石墨负极的可行性。

更新日期：2023-02-02

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南