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Nanometer manganese lithium phosphate/carbon positive electrode material and preparation method thereof

A technology of lithium manganese phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of complex preparation process, high synthesis cost, unfavorable practical application, etc., and achieve simple and controllable preparation process, low cost low effect

Inactive Publication Date: 2018-05-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is complicated, the synthesis cost is high, and the bonding force between carbon materials and lithium manganese phosphate materials is not good, which is not conducive to practical application

Method used

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  • Nanometer manganese lithium phosphate/carbon positive electrode material and preparation method thereof
  • Nanometer manganese lithium phosphate/carbon positive electrode material and preparation method thereof
  • Nanometer manganese lithium phosphate/carbon positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Preparation of high specific energy LiMnPO by a two-step method 4 / C nanoparticles:

[0031] Step (1), add 0.2451g manganese acetate, 0.1153g phosphoric acid (≥85wt.%) to the aqueous solution that contains citric acid (0.4202g), slowly evaporate to dryness at 70 DEG C of solvent, and in 700 DEG C of N 2 Atmosphere heat treatment for 1h, the heating rate is 10°C / min, to obtain Mn 2 P 2 o 7 / C precursor;

[0032] Step (2), Mn 2 P 2 o 7 / C precursor and lithium hydroxide were mixed uniformly according to the ratio of Mn:Li molar ratio of 1:1, and the heating rate was 10°C / min, 700°CN 2 Heat treatment under atmosphere for 10h to obtain LiMnPO 4 / C nanoparticles.

[0033] from figure 2 It can be seen that the obtained precursor Mn 2 P 2 o 7 / C has a nanoparticle structure. from image 3 It can be seen that the material obtained after lithiation is pure phase LiMnPO 4 , the crystallinity is high, and the sample is nano-morphological ( Figure 4 ).

[0034] ...

Embodiment 2

[0036] Preparation of high specific energy LiMnPO by a two-step method 4 / C nanoparticles:

[0037] Step (1), add 0.2451g of manganese acetate and 0.1151g of ammonium dihydrogen phosphate into an aqueous solution containing citric acid (0.4202g), slowly evaporate the solvent to dryness at 60°C, and heat-treat in an Ar atmosphere at 750°C for 0.5h, with a heating rate of 10°C / min, get Mn 2 P 2 o 7 / C precursor;

[0038] Step (2) Mn 2 P 2 o 7 / C precursor and lithium hydroxide were mixed evenly according to the ratio of Mn:Li molar ratio of 1:1, the heating rate was 10°C / min, and heat treatment was carried out at 800°C for 8h in Ar atmosphere to obtain LiMnPO 4 / C nanoparticles.

[0039] It can be seen from the attached figure that the precursor has a nanostructure, and the sample obtained after lithiation still maintains a nanomorphology. Prepared LiMnPO 4 The / C material exhibits excellent electrochemical performance with a carbon content of 12 wt.%. At 0.2C, the d...

Embodiment 3

[0041] Preparation of high specific energy LiMnPO by a two-step method 4 / C nanoparticles:

[0042] Step (1) Add 0.3579g of manganese nitrate (50wt.%) and 0.1151g of ammonium dihydrogen phosphate to an aqueous solution containing citric acid (0.4202g), slowly evaporate the solvent to dryness at 80°C, and heat-treat at 600°C for 2h in an Ar atmosphere. at 10°C / min to get Mn 2 P 2 o 7 / C precursor;

[0043] Step (2) Mn 2 P 2 o 7 / C precursor and lithium hydroxide were mixed evenly according to the Mn:Li molar ratio of 1:1, the heating rate was 10°C / min, and the heat treatment was carried out at 600°C for 12h in an Ar atmosphere to obtain LiMnPO 4 / C nanoparticles.

[0044] Precursor Mn 2 P 2 o 7 and lithiated LiMnPO 4 All are in the shape of nanoparticles, and the carbon content is 15wt.%. LiMnPO 4 / C material exhibits excellent electrochemical performance: at 0.1C, the discharge specific capacity is 132.6mAh g -1 ; After 50 cycles at a current density of 0.2C, th...

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Abstract

The invention discloses a nanometer manganese lithium phosphate / carbon positive electrode material and a preparation method thereof, wherein the surface of manganese lithium phosphate particles is coated with carbon, and the carbon content is 8-15 wt%. The preparation method comprises: using a manganese-containing compound and a phosphate as raw materials, using citric acid as a chelating agent, and carrying out heat treatment for 0.5-2 h at a temperature of 600-750 DEG C in an inert gas atmosphere by using a gel method to obtain a Mn2P2O7 / C precursor; and mixing the Mn2P2O7 / C precursor and alithium-containing compound, and carrying out heat treatment for 6-12 h at a temperature of 550-850 DEG C in an inert gas atmosphere to obtain the LiMnPO4 / C nanoparticles, wherein the product has highpurity and perfect crystal, and exhibits excellent electrochemical performance. According to the present invention, through the pre-coating of carbon on the surface of Mn2P2O7 particles, the growth of LiMnPO4 particles during lithiation can be effectively inhibited, and the electronic conductivity of the material can be improved; and the method has characteristics of simpleness, easy performing,low cost and environment protection, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a nanometer lithium manganese phosphate / carbon cathode material and a preparation method thereof. Background technique [0002] Due to the advantages of high working voltage, wide working range, high energy density, environmental friendliness, and no memory effect, lithium-ion batteries are widely used in many fields of production and life, including smartphones, tablet computers, notebook computers, wearable Smart devices (Google glasses, smart watches, etc.) and large-scale energy storage fields such as electric vehicles, communication base stations, and smart grids. Generally, a lithium-ion battery is composed of a positive electrode material, a separator, a negative electrode material and an electrolyte. Using a lithium-ion battery as a single energy source requires it to be able to store and release higher energy, which puts f...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 张校刚聂平窦辉邓海福蒋江民丁兵吴宇婷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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