Study on Improving Storage Life of Lithium Ion Batteries Based on Construction of Polymer Functional Protective Film on the Surface of Graphite Anode †

doi:10.7503/cjcu20190387

Abstract

Abstract:

Graphite anode uniformly coated with polyvinyl alcohol(PVA) was prepared by solution impregnation method. The morphology and electrochemical properties of graphite coated with PVA were stu-died. LiNi_0.8Co_0.15Al_0.05O₂(NCA) was used as cathode material and graphite coated with PVA was used as negative material to assemble soft-packed batteries. The effects of PVA coating on the electrical performance and storage life of full-scale batteries were studied. The results show that PVA coating can effectively inhibit the reaction between electrolyte and graphite-embedded lithium and prolong the storage life of the battery.

Key words: Polyvinyl alcohol, Surface coating, Graphite anode, Storage life, Lithium battery, Functional protective film

CLC Number:

O646

TrendMD:

Yujie LI,Yong LIU,Qizhi ZHAO,Chunman ZHENG. Study on Improving Storage Life of Lithium Ion Batteries Based on Construction of Polymer Functional Protective Film on the Surface of Graphite Anode ^†[J]. Chem. J. Chinese Universities, 2019, 40(12): 2542.

Figures/Tables 7

Fig.1 TEM image(A) of PVA@graphite and element disctribution of C(B) and O(C) of selected area framed in (A)

Fig.2 SEM images of graphite(A), 0.5%PVA@graphite(B), 1%PVA@graphite(C) and 4%PVA@graphite(D) after activation

Fig.3 Nyquist plot of PVA-Li and corresponding equivalent circuit(inset)(A) and CA results of PVA-Li(B)

Fig.4 Cyclic voltammogram curves of graphite(A) and 1%PVA@graphite(B) anodes Scan rate: 5 mV/s; electrlyte: 1 mmol/L LiPF6/EC+EMC(volume ratio 3:7).

Fig.5 The 1st and 5th charge-discharge curves of graphite(A) and 1%PVA@graphite(B)

Fig.6 Discharge curves of NCA/graphite(A) NCA/0.5PVA@graphite(B), NCA/1%PVA@graphite(C) and NCA/4%PVA@graphite(D) batteries

Fig.7 SEM images of graphite(A), 0.5%PVA@graphite(B), 1%PVA@graphite(C) and 4%PVA@graphite(D) after storage at 55 ℃ for 90 d

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