Engineering Ultrathin Carbon Layer on Porous Hard Carbon Boosts Sodium Storage with High Initial Coulombic Efficiency

Cheng, Dejian1,2,3; Li, Zhenghui3; Zhang, Minglu3; Duan, Zhihua3; Wang, Jun4; Wang, Chaoyang1,2

2023-09-01

10.1021/acsnano.3c04984

ACS NANO   Impact Factor & Quartile

1936-0851

1936-086X

Hard carbon (HC) has been widely adopted as the anode material for sodium ion batteries (NIBs). However, it is troubled by a low initial Coulombic efficiency (ICE) due to its porous structure. Herein, a graphitized and ultrathin carbon layer coating on HC is proposed to solve this challenge. The as-prepared porous carbon material coated with an ultrathin carbon layer composite (PCS@V@C) exhibits a cavity structure, which is prepared by using bis(cyclopentadienyl) nickel (CP-Ni) as the carbon source for outer coating, glucose carbon spheres as porous carbon, and introducing a silica layer to facilitate the coating process. When utilized as the anode for NIBs, the material shows an ICE increase from 47.1% to 85.3%, and specific capacity enhancement at 0.1 A g(-1) from 155.3 to 216.7 mA h g(-1). Moreover, its rate capability and cycling performance are outstanding, demonstrating a capacity of 140.3 mA h g(-1) at 10 A g(-1), and a retaining capacity of 225.6 mA h g(-1) after 300 cycles at 0.1 A g(-1) with the Coulombic efficiency of 100% at the second cycle. The excellent electrochemical performance of the PCS@V@C is attributed to the ultrathin carbon layer, which is beneficial for the formation of a stable solid electrolyte interphase (SEI) film. Therefore, this study provides a feasible surface modification method for the preparation of anode materials for NIBs with high specific capacity and ICE.

sodium ion batteries hard carbon initialCoulombic efficiency ultrathin carbon layer surfacemodification

SCI

English

NI Journal Papers

Corresponding

National Natural Science Foundation of China["22275059","52371225"] ; Science and Technology Planning Project of Guangdong Province[2021A0505110001]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001071388900001

AMER CHEMICAL SOC

Web of Science

1.South China Univ Technol, Res Inst Mat Sci, Guangzhou 510640, Peoples R China
2.South China Univ Technol, Key Lab Polymer Proc Engn, Minist Educ, Guangzhou 510640, Peoples R China
3.Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Peoples R China
4.Southern Univ Sci & Technol, Sch Innovat & Entrepreneurship, Shenzhen 518055, Peoples R China

Cheng, Dejian,Li, Zhenghui,Zhang, Minglu,et al. Engineering Ultrathin Carbon Layer on Porous Hard Carbon Boosts Sodium Storage with High Initial Coulombic Efficiency[J]. ACS NANO,2023.

Cheng, Dejian,Li, Zhenghui,Zhang, Minglu,Duan, Zhihua,Wang, Jun,&Wang, Chaoyang.(2023).Engineering Ultrathin Carbon Layer on Porous Hard Carbon Boosts Sodium Storage with High Initial Coulombic Efficiency.ACS NANO.

Cheng, Dejian,et al."Engineering Ultrathin Carbon Layer on Porous Hard Carbon Boosts Sodium Storage with High Initial Coulombic Efficiency".ACS NANO (2023).