Preparation method of graphene/nickel bicarbonate nanometer cubic three-dimensional composite material and application of composite material to energy storage

Abstract

The invention provides a preparation method of a graphene / nickel bicarbonate nanometer cubic three-dimensional composite material. The preparation method comprises the following steps: preparation ofgraphene oxide hydrosol: preparing graphene oxide with a Hummer' s method, and preparing the graphene oxide hydrosol from the prepared graphene oxide; adding urea into the prepared graphene oxide hydrosol, stirring uniformly, and slowly adding nickel acetate to obtain a precursor solution; transferring the precursor solution into a reaction kettle, placing the reaction kettle into a drying oven, and reacting at a constant temperature for a certain period of time to obtain graphene / nickel bicarbonate aerogel; performing vacuum freeze drying on the obtained graphene / nickel bicarbonate aerogel toobtain the graphene / nickel bicarbonate nanometer cubic three-dimensional composite material. The prepared graphene / nickel bicarbonate nanometer cubic three-dimensional composite material is applied to power lithium batteries and super batteries as an electrode material, and has excellent electric performance. The preparation method provided by the invention has the advantages of simple reaction process, easiness in operation, low cost, energy saving and environmental friendliness, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of nanocomposite material preparation, in particular to a method for preparing a graphene / nickel bicarbonate nanocube three-dimensional composite material and its application to a power lithium ion battery anode and a supercapacitor. Background technique [0002] The growing popularity of everything from mobile electronic devices to electric vehicles has created an ever-increasing demand for high-performance lithium-ion batteries. A large number of studies have focused on the research of new electrode materials, such as some transition metals, oxides and carbonates with high theoretical capacity have become research hotspots. The research results show that nickel bicarbonate has a higher specific capacity than nickel carbonate and other carbonates (iron, cobalt, manganese) as a lithium battery anode. Chinese patent document CN 103880093 B discloses a nickel bicarbonate hollow sphere aggregate. The patent utilizes sol...

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Problems solved by technology

Chinese patent document CN 103880093 B discloses a nickel bicarbonate hollow sphere aggregate. The patent utilizes soluble nickel salt to dissolve in water, and adds carbonate precipitating agent, metal complexing agent and surfactant to its structural regulation to synthesize carbonic acid Agglomerates of Ni-MH hollow connected spheres were tested in ACS Energy Lett, 2017, 2(1):111−116 (Shiqiang Zhao, Zewei Wang, Yanjie He et al.Interconnected Ni(HCO 3 ) 2 Hollow Spheres Enabled by Self-Sacrificial Templating with Enhanced Lithium Storage Properties. ACS Energy Letters, 2017, 2(1):111-116), the results show that the hollow sphere aggregates of nickel bicarbonate greatly improve the capacity and rate performance of lithium-ion batteries , however, the structural damage of the material affects its cycle performance as an electrode material, resulting in poor cycle performance

The preparation process of the above two documents is cumbersome, with many types of raw materials and uneven product structure and morphology, which will have a serious impact on product performance and application. The production process will be time-consuming, labor-intensive and costly.

In view of the fact that the self-assembled three-dimensional homogeneous composite material of pure phase graphene / nickel bicarbonate nanocubes has a wide range of applications and research value as a new type of functional material, there is no related report, so it is of great significance to its development and research and application value

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