期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 20, 页码 17100-17106出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03329
关键词
Nickel cobalt sulfide; Nickel sulfide; Nanosheet array; Binder-free electrode; Li-ion battery
资金
- Ministry of Science and Technology in Taiwan [MOST 10S-2221-E-006-251-MY3, MOST 106-2221-E-006-202-MY3]
In this work, metal sulfide composite nanosheet arrays are directly grown on Ni foam substrates using chemical bath deposition to construct binder-free electrodes for Li-ion batteries. Structural characterizations indicate that the nanosheets are composed of nickel cobalt sulfide and nickel sulfide nanocrystals with sizes of 2-5 nm embedded in an amorphous matrix. Superior reversible capacity, cycling stability, and rate performance are acquired from the binder-free metal sulfide composite nanosheet electrode compared to the binder-free granular metal sulfide composite film electrode, which is attributed to the unique morphology and structure of the nanosheet array. At a current density of 200 mAg(-1), 10% capacity loss is acquired from the binder-free metal sulfide composite nanosheet electrode after 100 cycles. The nanosheet electrode also exhibits a promising rate performance that the reversible capacities of 1860, 1610, 1350, 1170, and 1050 mAhg(-1) are measured at current densities of 200, 500, 1000, 2000, and 3000 mAg(-1), respectively.
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