A sandwich‑like CMC‑based/graphene/CMC‑based conductive agent prepared from needle coke for high‑performance LiFePO4 batteries
(주)코리아스칼라
- 최초 등록일
- 2023.12.18
- 최종 저작일
- 2023.12
- 15페이지/ 어도비 PDF
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 33권 / 7호
ㆍ저자명 : Jin Zou, Xi‑Xi Long, Jia‑Le He, Shi‑Peng Yu, Sheng‑Wen Zhong
목차
A sandwich-like CMC-basedgrapheneCMC-based conductive agent prepared from needle coke for high-performance LiFePO4 batteries
Abstract
1 Introduction
2 Experimental section
2.1 Materials
2.2 Preparation of GNCNs
2.3 Characterization
2.4 Electrochemical measurements
3 Results and discussion
4 Conclusions
Anchor 11
Acknowledgements
References
영어 초록
Liquid phase exfoliation of natural graphite is an industrially effective solution for graphene preparation. However, many countries have identified natural graphite as a strategic resource and restricted its mining. In this report, we used abundant and readily available needle coke (NC) as a graphene exfoliation precursor and sodium carboxymethyl cellulose (CMC) as a dispersant to prepare a sandwich structured conductive graphitized NC nanosheets (GNCNs) by liquid phase exfoliation, freeze-drying and high-temperature graphitization, in which a graphene layer is sandwiched between two thin CMC layers. CMC could increase the liquid absorption and retention ability of the conductive agent and improve the migration rate of lithium ions. The highly ordered graphene layer could accelerate the transmission of electrons. The GNCNs with 0.4 wt% CMC addition showed good rate performance (144.6 mAh g− 1 at 5 C) and high cycle stability (96.2% after 200 cycles at 1 C) for LiFePO4 (LFP) battery. The traditional Super-P (SP) conductive agent exhibited low-rate performance (113.9 mAh g− 1 at 5 C) and cycle performance (89.9% after 200 cycles at 1 C). This study offers a novel approach to selecting graphene precursors and has promising applications for conductive additives in high-performance LFP batteries.
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