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Preparation method of monodisperse nanometer olivine type manganese-based phosphate positive-pole material and lithium-ion secondary battery thereof

An olivine-type manganese-based phosphate, cathode material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as preparing monodispersion, and achieve controllable morphology, good dispersibility, and good application prospects. Effect

Active Publication Date: 2012-12-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the existing published results, it is still a challenge for the hydrothermal method to prepare monodisperse, uniform and controllable shape, size and manganese-based phosphate nano-cathode materials.

Method used

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  • Preparation method of monodisperse nanometer olivine type manganese-based phosphate positive-pole material and lithium-ion secondary battery thereof
  • Preparation method of monodisperse nanometer olivine type manganese-based phosphate positive-pole material and lithium-ion secondary battery thereof
  • Preparation method of monodisperse nanometer olivine type manganese-based phosphate positive-pole material and lithium-ion secondary battery thereof

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preparation example Construction

[0037] A method for preparing a monodisperse nanometer olivine-type manganese-based phosphate positive electrode material, the steps are: dispersing a lithium source compound, a manganese source compound, a phosphorus source compound and a compound doped with elements in the case of doping in water and an organic solvent In the mixed solvent, the volume ratio of the organic solvent and water in the mixed solvent is controlled at 0-5:1, and the mixed solvothermal reaction is carried out in the reactor, the reaction temperature is 120-230°C, the reaction pressure is 0.2-30Mpa, and the reaction time is From 1 minute to 24 hours, the positive electrode material of monodisperse nano-olivine manganese-based phosphate particles is finally obtained, and its chemical formula is Li x mn y m 1-y PO 4 , 0.8≤x≤1.2, 0.5≤y≤1.0, preferably 0.85≤x≤1.15, 0.6≤y≤1.0, more preferably 0.9≤x≤1.1, 0.8≤y≤1.0; M is Fe, Co, Ni, At least one metal element of Zn, Cu, Al, Mg, Ti, Zr, Sn, V, Nb, W, La, C...

Embodiment 1

[0054] Measure 150ml of 1M phosphoric acid aqueous solution, add it to 600ml polyethylene glycol 400, and mix well. Then add 300ml, 0.5M MnSO 4 aqueous solution, and stir well. Then, 450 ml of 1M LiOH aqueous solution was added to the above solution. After mixing evenly, the above solution was transferred into a closed stainless steel reactor lined with polytetrafluoroethylene, heated to 180°C and kept for 12 hours. After cooling to room temperature, washing with deionized water and drying to obtain lithium manganese phosphate nanomaterials. Elemental analysis results show that the product has LiMnPO 4 chemical formula. The X-ray diffraction pattern of the product is as figure 1As shown, the product is shown to be a pure lithium manganese phosphate phase. The shape of the product is as figure 2 As shown, they are all in the shape of nanorods, and the size distribution is uniform. The length of the nanorods is 100-500nm, and the width is about 50-100nm.

Embodiment 2

[0056] Measure 150ml of 1M phosphoric acid solution, add it to 600ml polyethylene glycol 400, and mix well. Then add 450ml, 1M LiOH solution, and stir well. Then add 300ml, 0.5M MnSO to the above solution 4 solution. After mixing evenly, the above solution was transferred into a closed stainless steel reactor lined with polytetrafluoroethylene, heated to 140°C and kept for 10 hours. After cooling to room temperature, washing with deionized water and drying to obtain lithium manganese phosphate nanomaterials. Elemental analysis results show that the product has LiMnPO 4 chemical formula. The shape of the product is as image 3 As shown, it is a monodisperse nanosheet with a diameter of about 100 nm and a thickness of less than 30 nm.

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Abstract

The invention relates to a preparation method of a monodisperse nanometer olivine type manganese-based phosphate positive-pole material and a lithium-ion secondary battery thereof. The preparation method of the monodisperse nanometer olivine type manganese-based phosphate positive-pole material comprises the following steps of: dispersing a lithium source compound, a manganese source compound, a phosphorus source compound and a doped element compound into a mixed solvent containing water and an organic solvent; controlling the volume ratio of the organic solvent to the water which are contained in the mixed solvent at (0-5):1; and carrying out mixed solvent thermal reaction in a reactor at the temperature of 120-230 DEG C under the reaction pressure of 0.2-30 MPa for 1 minute-24 hours so as to finally obtain the monodisperse nanometer olivine type manganese-based phosphate granule positive-pole material. The invention also discloses the relevant lithium-ion secondary battery. The monodisperse lithium iron phosphate nanometer material with rod-shaped and sheet-shaped appearance, which is prepared by adopting the mixed solvent thermal method, has the advantages of good crystallinity, uniform dimension, controllable shape and good dispersity; and when the monodisperse lithium iron phosphate nanometer material is used as a positive-pole active material of the lithium-ion secondary battery, the lithium-ion secondary battery has high discharge voltage platform and large specific capacity.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a preparation method of a monodisperse olivine-type manganese-based phosphate nanometer cathode material and related lithium-ion secondary batteries. Background technique [0002] Compared with traditional lead-acid, nickel-cadmium, nickel-metal hydride and other batteries, lithium-ion secondary batteries have many advantages such as high energy density, high power density, good cycle performance, long service life, no memory effect, and less environmental pollution. Lithium-ion secondary batteries have been widely used in the power supply of small portable electronic devices, and its development prospects in high-power, large-capacity power and energy storage batteries are even more exciting. [0003] Electrode active materials are the key factors affecting the performance of lithium-ion batteries. LiCoO 2 It is the earliest positive electrode acti...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘兆平周旭峰秦志鸿
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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