Study on Electrochemical Performances of N-doped P/C Composite as Anode Material of Lithium Ion Batteries †

doi:10.7503/cjcu20190296

Abstract

Abstract:

Using commercial activated carbon as the carbon source and tripolycyanamide as nitrgon source, N doped P/C anode materials were directly synthesized by the deposition method. The results show that nano-red phosphorus uniformly distributes in pores of conductive carbon substrate when the amount of tripolycyannmide is 10%(mass fraction), which effectively increases the contact area with electrolyte. Typically, benefiting from that P—C bond could endow anode material with cycling and structure stability. The charge capacity of the CPN2 material is 2282.2 mA·h·g ^-1 at 0.1C and 25 ℃, and the reversible capacity is 92.5% after 100 cycles. At a rate of 0.1C, the specific capacity of CPN2 reaches 1128.2 mA·h·g ^-1 at -10 ℃ and 2060.5 mA·h·g ^-1 at 55 ℃, respectively.

Key words: Red phosphorus, Activated carbon, Nitrogen-doping, Deposition method, Lithium ion battery

CLC Number:

O646

TrendMD:

LI Xiangnan,YU Mingming,FAN Yong,WANG Qiuxian,ZHANG Huishuang,YANG Shuting. Study on Electrochemical Performances of N-doped P/C Composite as Anode Material of Lithium Ion Batteries ^†[J]. Chem. J. Chinese Universities, 2019, 40(11): 2360.

Figures/Tables 7

Fig.1 XRD patterns of pure P(a) and CPN0(b), CPN1(c), CPN2(d), CPN3(e)(A) and TGA curve of CPN2(B)

Fig.2 SEM images of CPN0(A, A'), CPN1(B, B'), CPN2(C, C') and CPN3(D, D')

Fig.3 SEM images(A, D, H) and EDS element mappings images(B, C, E—G, I—L) of AC(A—C), CN2(D—G) and CPN2(H—L) (B, E, I) C mapping; (C, F, J) O mapping; (G, K) N mapping; (L) P mapping.

Fig.4 XPS spectra and fitting results (A) XPS survey spectra of CPN0(a) and CPN2(b); (B) P2p spectra of CPN0(a) and CPN2(b); (C) N1s spectra of CPN2.

Fig.5 Cycling performances(A) and the first cycle charge-discharge curves(B) of CPN0, CPN1, CPN2 and CPN3 assembled cells at 0.1C(B)

Fig.6 Cycling performance of CPN2-assembled cell at high(A) and low(B) temperature and at different rates(C) and AC impedance spectra and the equivalent circuit diagram(inset) for CPN0 and CPN2 assembled cells at different temperature after 10 cycles(D)

Fig.7 CV profiles of CPN2-assembled cell at various scan rates from 0.4—0.8 mV/s(A) and capacitive charge storage contributions at a scan rate of 0.4 mV/s(B)

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