Surface-modification of graphite with N-heterocyclic conducting polymers as high performance anodes for Li-ion batteries

doi:10.19799/j.cnki.2095-4239.2024.0152

Abstract

Abstract:

Graphite is an important anode material for lithium-ion batteries (LIBs), but its shortcomings in conductivity, theoretical capacity, and rate performance limit its application in these systems. Surface coating is an effective strategy for optimizing the electrochemical properties of graphite in LIBs. Currently, surface coating is widely used for the modification of graphite by using pitch-based materials as coating precursors, which can reduce the specific surface area and polarization capacity loss. However, the strategy underlying anode modification must be optimized considering the applications of next-generation batteries. In this study, the in-situ surface coating modification of graphite is carried out by using an N-heterocyclic conductive polymer as a coating agent for a gradient coating. Upon investigating the coated graphite, it was found that the coating using the N-heterocyclic conductive polymer on the surface of graphite can effectively improve its specific capacity as the coating amount is increased (Gr: 352.3 mAh/g; N-heterocyclic-coated graphite: 359.7 mAh/g). Moreover, the fast charging performance of graphite was significantly enhanced after coating with the N-heterocyclic conductive polymer and optimizing the coating quantity (at 1.2 C/0.05 C, Gr: 39.22%; N-heterocyclic-coated graphite: 50.97%), achieving a significant breakthrough as commercial anodes considering the electrochemical performance of LIBs. The characterization and mechanism analyses indicate that the coating modification by the N-heterocyclic conductive polymer provides surface conductive network and additional lithium-ion adsorption sites for graphite. This greatly contributes to enhancing the specific capacity and fast charging performance of graphite, and it can be used as an effective method for the surface modification of next-generation anodes.

Key words: conductive polymer, surface modification, graphite, lithium ion battery, anode

CLC Number:

TM 911

Zhiyong WANG, Junyao CAI, Yingqi SHE, Shulin ZHONG, Kanghua PAN. Surface-modification of graphite with N-heterocyclic conducting polymers as high performance anodes for Li-ion batteries[J]. Energy Storage Science and Technology, 2024, 13(8): 2511-2518.

Figures/Tables 10

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样品	粒径/μm
样品	D₀₀	D₀₁	D₁₀	D₅₀	D₉₀	D₉₇	D₉₉	D₁₀₀
Gr	3.14	4.25	6.31	11.28	19.9	24.91	28.75	35.29
Gr@PD	4.04	5.15	7.42	12.92	22.17	27.24	31.01	40.08
Gr@PAN-1	4.04	5.28	7.54	12.97	22.28	27.39	31.3	40.06
Gr@PAN-2	4.04	5.28	7.53	12.93	22.1	27.18	30.97	40.07
Gr@PAN-3	4.05	5.32	7.63	13.07	22.29	27.31	31.05	40.08

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