Excellent performance of a modified graphite anode for lithium-ion battery application
- PDF / 1,151,618 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 57 Downloads / 184 Views
ORIGINAL PAPER
Excellent performance of a modified graphite anode for lithium-ion battery application Xingqun Liao 1 & Zhiying Ding 1 & Zhoulan Yin 1 Received: 29 December 2019 / Revised: 28 March 2020 / Accepted: 13 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Electrochemical performance of a potential fast-charging graphite material in lithium-ion batteries prepared by the modification of natural flake graphite (FG-1) is investigated. FG-1 displays excellent electrochemical performance than most of the modified NFG materials. Galvanostatic cycling tests performed in half cells give the initial capacity of 382.7/361.1 mAh g−1, delivering a small irreversible capacity (21.6 mAh g−1) and high coulombic efficiency (94.4%). The carbon-coated graphite displays superior rate performance at 2 C and 3 C currents in pouch cells. FG1 can cycle at ambient temperature for 500 times under 2 C/1 C and 3 C/1 C regimes with capacity retention of 90.24% and 86.83%, respectively. Moreover, 86.93% and 86.65% of capacity are retained after 800 cycles at 45 °C under the same currents. Storage at elevated temperature (60 °C) after 21 days leads to only 2.98% of voltage drop, as well as 75.72% and 86.43% of capacity retention and recovery. Keywords Modified graphite . Anode . Lithium-ion batteries . Carbon-coated . Electrochemical performance
Introduction Since the commercialization of rechargeable lithium-ion battery, graphite materials have been playing a dominant role in anode research and related products [1–3]. Due to the abundant source in nature, natural flake graphite (NFG) is the most widely studied anode, benefiting to the advantages of low cost and high capacity [4–6]. However, the intrinsic structural instability prohibits the commercial process because of the requirement of long cycling stability, high coulombic efficiency, excellent rate capability, and good compatibility with electrolyte in lithium-ion batteries [7]. Then great efforts have been made to synthesize the modified [8–11] or Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03577-7) contains supplementary material, which is available to authorized users. * Zhiying Ding [email protected] * Zhoulan Yin [email protected] 1
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, People’s Republic of China
artificial graphite [12–15] by using natural graphite, petroleum cokes, coal pitch, etc. as precursors. Among them, the two latter raw materials are systematically explored in large-scale production, while the former primarily focus on the laboratory synthesis. Therefore, it is urgent to extend the use of natural graphite for the manufacturer to reduce the cost. As mentioned previously, NFG possesses poor rate performance and cycling stability, which originates from the relatively low intrinsic conductivity of graphite and the long Li+ migration distance. It is a common sense that NFG is highly anisotropic with high OI value (OI
Data Loading...
