Activated Carbon Nanofibers as High Capacity Anodes for Lithium-Ion Batteries

Germanium dioxide is a promising high-capacity anode material for lithium-ion batteries, but it usually exhibits poor cycling stability due to its large volume change during the lithiation/delithiation process.

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Effect of Deep Cryogenic Activated Treatment on Hemp Stem-Derived Carbon Used as Anode for Lithium-Ion Batteries

Nanoscale Research Letters ◽

10.1186/s11671-020-03422-w ◽

2020 ◽

Vol 15 (1) ◽

Author(s):

Zhigang Li ◽

Zhongxiang Guan ◽

Zhiping Guan ◽

Ce Liang ◽

Kaifeng Yu

Keyword(s):

Activated Carbon ◽

Pore Structure ◽

Lithium Ion Batteries ◽

Lithium Ion Battery ◽

Anode Materials ◽

Cryogenic Treatment ◽

High Capacity ◽

Lithium Ion ◽

Reversible Capacity ◽

Cryogenic Process

Abstract The cryogenic process has been widely applied in various fields, but it has rarely been reported in the preparation of anode materials for lithium-ion battery. In this paper, activated carbon derived from hemp stems was prepared by carbonization and activation; then, it was subjected to cryogenic treatment to obtain cryogenic activated carbon. The characterization results show that the cryogenic activated carbon (CAC) has a richer pore structure than the activated carbon (AC) without cryogenic treatment, and its specific surface area is 1727.96 m2/g. The porous carbon had an excellent reversible capacity of 756.8 mAh/g after 100 cycles at 0.2 C as anode of lithium-ion battery, in which the electrochemical performance of CAC was remarkably improved due to its good pore structure. This provides a new idea for the preparation of anode materials for high-capacity lithium-ion batteries.

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Characterization and Preparation of Nano-porous Carbon Derived from Hemp Stems as Anode for Lithium-Ion Batteries

Nanoscale Research Letters ◽

10.1186/s11671-019-3161-1 ◽

2019 ◽

Vol 14 (1) ◽

Cited By ~ 4

Author(s):

Zhongxiang Guan ◽

Zhiping Guan ◽

Zhigang Li ◽

Junhui Liu ◽

Kaifeng Yu

Keyword(s):

Activated Carbon ◽

Lithium Ion Batteries ◽

Porous Carbon ◽

Low Cost ◽

Specific Capacity ◽

High Capacity ◽

Lithium Ion ◽

Reversible Capacity ◽

Biomass Waste ◽

Rapid Preparation

Abstract As a biomass waste, hemp stems have the advantages of low cost and abundance, and it is regarded as a promising anode material with a high specific capacity. In this paper, activated carbon derived from hemp stems is prepared by low-temperature carbonization and high-temperature activation. The results of characterizations show the activated carbon has more pores due to the advantages of natural porous structure of hemp stem. The aperture size is mainly microporous, and there are mesopores and macropores in the porous carbon. The porous carbon has an excellent reversible capacity of 495 mAh/g after 100 cycles at 0.2 °C as the anode of lithium-ion battery. Compared with the graphite electrode, the electrochemical property of activated carbon is significantly improved due to the reasonable distribution of pore size. The preparation of the activated carbon provides a new idea for low cost and rapid preparation of anode materials for high capacity lithium-ion batteries.

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