Synthesis of Li-rich Layers/Spinel/Carbon Composite Cathode Materials with Phenol Formaldehyde Resin and Its Electrochemical Performance†

doi:10.7503/cjcu20200033

Abstract

Abstract:

A li-rich layers/spinel/carbon heterostructure cathode material was synthesized by phenol formaldehyde resin coating and subsequent carbon thermal reaction, the structure, monography and electrochemical performance of the material were studied. For this structure, the spinel phase plays a role to provide a three-dimensional lithium-ion transport channel while the carbon coating layer help with the conductivity of the cathode. Those two layers lower the electrochemical impedance of the material and improve the specific capacity. The cathode material deliver an excellent performance of 135.1 mA·h/g at 5C.

Key words: Lithium-ion battery, Lithium-rich cathode material, Spinel layered composite cathode material, Carbon coating

CLC Number:

O646

TrendMD:

LU Di,ZHENG Chunman,CHEN Yufang,LI Yujie,ZHANG Hongmei. Synthesis of Li-rich Layers/Spinel/Carbon Composite Cathode Materials with Phenol Formaldehyde Resin and Its Electrochemical Performance^†[J]. Chem. J. Chinese Universities, 2020, 41(7): 1684.

Figures/Tables 8

Sample	lattice parameter/nm				Ni²⁺ in Li layer, w(%)	w(%)			Reliability factor
	R $3 ˉ$ m		C2/m	Fd $3 ˉ$ m		w(%)			Reliability factor
	a	c	a	a		R $3 ˉ$ m	C2/m	Fd $3 ˉ$ m	R_wp(%)	GOF
LR	0.28489	1.42176	0.49302	—	1.9	61.4	38.6	—	1.85	1.09
LR@S@C	0.28514	1.42238	0.49474	0.81940	1.7	50.3	32.5	17.2	1.75	1.06

Sample	lattice parameter/nm				Ni²⁺ in Li layer, w(%)	w(%)			Reliability factor
	R $3 ˉ$ m		C2/m	Fd $3 ˉ$ m		w(%)			Reliability factor
	a	c	a	a		R $3 ˉ$ m	C2/m	Fd $3 ˉ$ m	R_wp(%)	GOF
LR	0.28489	1.42176	0.49302	—	1.9	61.4	38.6	—	1.85	1.09
LR@S@C	0.28514	1.42238	0.49474	0.81940	1.7	50.3	32.5	17.2	1.75	1.06

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