Preparation method for synthesizing LiNi1/3Co1/3Mn1/3O2 nanometer fiber by using electro-spinning technique

Abstract

The invention discloses a preparation method for synthesizing a LiNi1 / 3Co1 / 3Mn1 / 3O2 nanometer fiber by using an electro-spinning technique, and belongs to the technical field of lithium ion battery electrode materials and preparation of the materials. The preparation method comprises the steps: preparing a precursor solution by using raw materials of lithium nitrate, nickel nitrate, cobalt nitrate, manganese acetate, deionized water, polyacrylic acid and polyvinylpyrrolidone (PVP) as raw materials, preparing a PVP / LiNi1 / 3Co1 / 3Mn1 / 3O2 composite fiber through using an electro-spinning technique, insulating, sintering, and cooling to a room temperature to obtain the LiNi1 / 3Co1 / 3Mn1 / 3O2 nanometer fiber. The preparation method is simple in process, convenient to operate, low in cost and slight in pollution. An anode material of the LiNi1 / 3Co1 / 3Mn1 / 3O2 nanometer fiber prepared by using the preparation method provided by the invention has a good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials and preparation thereof, and in particular provides an electrospinning technology to synthesize lithium-ion battery cathode materials and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, high working voltage, long cycle life, good safety performance, no memory effect, and no pollution. It is currently the most advanced green secondary battery. A lithium-ion battery generally includes a positive electrode, a negative electrode, a separator, and an electrolyte. Its working principle is that lithium ions are extracted and intercalated between the positive and negative electrode materials through the electrolyte, so the structure and performance of the electrolyte and electrode materials are key factors affecting battery performance and its price. At present, the common cat...

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Problems solved by technology

However, the above cathode materials have their own disadvantages: LiCoO 2 The structure is unstable at high potential, and the actual capacity is only half of the theoretical capacity; LiNiO 2 The crystal stability is poor and the cycle performance is seriously insufficient; LiMn 2 o 4 Medium Mn 2+ It is easy to dissolve in the electrolyte and cause rapid capacity decay; LiFePO 4 The poor conductivity of the lithium ion makes it difficult to intercalate lithium ions, while the layered structure of the ternary LiNi x co y mn 1-x-y o 2 Lithium-ion battery cathode material, integrated LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three layered materials are that their performance is significantly better than any of the above single-component positive electrode materials, and there is an obvious synergistic complementary effect: the introduction of Co can reduce the occurrence of mixed cations and effectively stabilize the layered structure of the material ; The introduction of Ni can increase the capacity of the material; the introduction of Mn can reduce the material cost and improve the safety and stability of the material

At present, the use of electrospinning technology to synthesize LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 There are few reports on lithium-ion cathode materials

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