Preparation method and application research of nitrogen-doped carbon/nickel oxide/nickel/sulfur composite lithium-sulfur battery positive electrode
A lithium-sulfur battery and composite cathode material technology, applied in nickel oxide/nickel hydroxide, battery electrodes, preparation/purification of sulfur, etc., can solve the problems of poor conductivity and volume expansion of the cathode, improve cycle performance and promote transfer and the effect of ion transport
Active Publication Date: 2022-04-01
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology
However, lithium-sulfur batteries face challenges such as poor conductivity of the cathode, the shuttle effect of polysulfides, the volume expansion of the cathode, and the growth of lithium dendrites.
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Embodiment 1
[0017] A preparation method using Ni-MOF derived NIONC as a sulfur-fixed material for lithium-sulfur batteries, comprising the following steps:
[0018] (1) Preparation of Ni-MOF flood body: In a typical synthesis, nickel nitrate (0.058g, 0.2mmol) and 4-pyridinecarboxylic acid (0.024g, 0.2mmol) were dissolved in 30ml of DMF, absolute ethanol and deionized In a mixed solvent of water (volume ratio=9:5:1). Then, sonicate the mixed solution for 15 min and transfer it to a 50 mL Teflon-lined steel autoclave. After reacting in an oven at 150 °C for 6 h, the product was collected by suction filtration, washed several times with deionized water and ethanol, and then vacuum-dried at 60 °C for 12 h to obtain the precursor Ni-MOF. As shown in the electron microscope ( figure 1 ); the crystallinity of Ni-MOF is shown in its powder X-ray diffraction pattern ( figure 2 ); the functional groups of Ni-MOF are shown in its infrared spectrum ( image 3 ).
[0019] (2) Preparation of NION...
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The invention discloses a preparation method of a hierarchical mesoporous nitrogen-doped carbon / nickel oxide / nickel microsphere material obtained by deriving a metal organic framework (MOF) compound, a sulfur-containing composite material is prepared by adopting a hot melting method for sulfur fixation, and the performance of the sulfur-containing composite material as a positive electrode of a lithium-sulfur battery is explored. The preparation method comprises the following steps: firstly, preparing Ni-MOF as a precursor by adopting a solvothermal method, and taking nickel nitrate as a metal source; the organic ligand is 4-picolinic acid; the solvent is a mixed solution of DMF, absolute ethyl alcohol and deionized water. In the high-temperature one-step pyrolysis process, the nitrogen-doped carbon / nickel oxide / nickel (named as NIONC) ternary composite material is obtained in one step through programmed temperature control. And filling sulfur into the graded pore channels by taking the graded pore channels as a matrix material and adopting a vacuum melting method. Experiments show that the positive electrode material has excellent cycling stability and relatively high sulfur utilization rate, and the performance of the lithium-sulfur battery is remarkably improved.
Description
technical field [0001] The invention belongs to the technical field of functional nano-composite materials, and more specifically, it uses a metal-organic framework material as a precursor and calcines the precursor in an inert gas atmosphere to prepare a lithium-sulfur battery anode sulfur-fixing matrix material. In particular, through a one-step pyrolysis method, a porous carbon matrix uniformly decorated with metal nanoparticles, oxide particles, and nitrogen atoms was obtained, and the synthesized porous composite material was used as a lithium-sulfur battery cathode after sulfur fixation, improving the Sulfur utilization, improving the volume expansion and shuttling effect of the lithium-sulfur battery cathode. Background technique [0002] The traditional lithium-sulfur battery is an energy storage device with metal lithium as the negative electrode and sulfur as the positive electrode. Lithium-sulfur batteries hold promising applications due to their high energy dens...
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IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M4/58C01G53/04C01B32/05C01B17/02
CPCY02E60/10
Inventor 李彩霞张凯张昱任俊锋李佳绪王磊
Owner QINGDAO UNIV OF SCI & TECH