Enzymatic preparation of rice-starch-based surface-modified disordered carbon as an anode for lithium-ion batteries

Luo, Jianmin; Wang, Lei; Lai, Shidi; Sun, Zhipeng; Guo, Haipeng; Lai, Yinlong; Zhu, Lejie; Liu, Ping

doi:10.1007/s11581-020-03802-3

Cited by 2 publications

(1 citation statement)

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“…Figure 1b describes the structural evolution of starch during the hydrolyzation process by glucoamylase. It is well known that glucoamylase can promote the conversion of more amylose to amylopectin by cutting α,1−4 and α,1−6 glycosidic linkages 38 and release CO 2 to produce more holes. 39,40 To verify this claim, we conducted gel permeation chromatography (GPC) and UV−vis tests on corn starch (CS) and corn starch treated with glucoamylase (GCS), respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sustainable Fabrication of a Practical Hard Carbon Anode for a Sodium-Ion Battery with Unprecedented Long Cycle Life

Song,

Li,

Mao

et al. 2023

ACS Sustainable Chem. Eng.

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Boosting the application of sodium-ion batteries (SIBs) requires the development of economical and high-performance anode materials. Here, we report a low-cost, environmentally friendly, and scalable preparation method to prepare hard carbon (HC) from a corn starch precursor by bioenzymatic action. This strategy can effectively inhibit the serious foaming of starch during pretreatment and make the internal microstructure of HC have a larger interlayer distance, a more disordered structure, and higher CO content. As an anode for SIB, the enzymatic-assisted synthesis of HC has a high reversible capacity of 346 mAh·g–1, an initial Coulombic efficiency (ICE) of up to 91%, and a remarkably enhanced sodium-ion transport kinetics of 271 mAh·g–1 at 5C. Moreover, it displays extremely high retention of 92% after 2500 cycles at 1C and 93% after 6500 cycles at 3C. Such HC reaches all of the performance indicators for anode materials as well as a low surface area, demonstrating the advancement of this synthetic strategy in fabricating practical HC. In addition, the full-cell, by coupling with a Na3V2(PO4)3 (NVP) cathode, delivers a high capacity of 323 mAh·g–1 at 1C from the anode side, an outstanding rate capability of 313 mAh·g–1 at 5C, and good cycling performance. These satisfactory electrochemical properties, combined with renewable resources and scalable synthesis routes, enable the present HC to become a practical SIB anode.

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Section: ■ Results and Discussionmentioning

confidence: 99%