Preparation of LiNi0.8Co0.2O2 Cathode Material for Lithium Secondary Batteries from Spherical α-Ni0.8Co0.2(OH)2

Abstract

Abstract: LiNi_0.8Co_0.2O₂ cathode material is a very promising candidate to replace LiCoO₂ for lithium secondary batteries.
Spherical α-Ni_0.8Co_0.2(OH)₂ powders were prepared via a “controlled crystallization” method. The LiNi_0.8Co_0.2O₂ powders
were synthesized by sintering the α-Ni_0.8Co_0.2(OH)₂ precursor and LiOH·H2O in oxygen at 700℃ for 4h. XRD results show the powders
are highly crystallized LiNi0.8Co0.2O2 with order α-NaFeO_2 layer structure. SEM photographs show the powders are spherical dispersed particulate with
the particle size of approximately 8μm. The powders have good fluidity and high tap-density. Electrochemical test proves the LiNi_0.8Co_0.2O₂ cathode material has excellent
electrochemical performance. The material shows a high initial charge capacity of 197mAh·g^-1 and discharge capacity of 174mAh·g^-1, and retention of more than 96.6% after 10 cycles.

Key words: lithium secondary batteries, α-Ni_0.8Co_0.2(OH)₂, LiNi_0.8Co_0.2O₂, spherical

CLC Number:

TM912

YING Jie-Rong,WAN Chun-Rong,JIANG Chang-Yin. Preparation of LiNi_0.8Co_0.2O₂ Cathode Material for Lithium Secondary Batteries from Spherical α-Ni_0.8Co_0.2(OH)₂[J]. Journal of Inorganic Materials.

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Preparation of LiNi_0.8Co_0.2O₂ Cathode Material for Lithium Secondary Batteries from Spherical α-Ni_0.8Co_0.2(OH)₂

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