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Spherical cathode material for lithium-ion secondary battery and preparation method of spherical cathode material

A secondary battery and positive electrode material technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve problems such as difficult to obtain, achieve the effects of inhibiting rapid growth, improving rapid charge and discharge performance, and shortening the diffusion distance

Active Publication Date: 2016-05-04
SUZHOU SUN SOURCE NANO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing preparation of LiFe x mn 1-x PO 4 There are many methods for positive electrode materials, such as solid phase ball milling, co-precipitation, Sol-Gel method, etc., but these methods are difficult to obtain special spherical LiFe x mn 1-x PO 4 Cathode material

Method used

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  • Spherical cathode material for lithium-ion secondary battery and preparation method of spherical cathode material
  • Spherical cathode material for lithium-ion secondary battery and preparation method of spherical cathode material
  • Spherical cathode material for lithium-ion secondary battery and preparation method of spherical cathode material

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Experimental program
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Effect test

Embodiment 1

[0031] 1. Weighing of raw materials: Weigh 2.4g of lithium hydroxide, 8.6g of iron phosphate, 3.2g of glucose and 19.2g of oxalic acid, and measure 500mL of deionized water.

[0032] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0033] 3. Atomization: Pour the above solution into an atomizer, atomize to form droplets, and then introduce the droplets into the low-temperature zone (-196°C) of the freeze dryer to obtain solid powder.

[0034] 4. Drying: The solid powder is dried by a freeze dryer, and the obtained powder is rapidly pyrolyzed in a high-temperature furnace. The pyrolysis temperature is 750°C, and the pyrolysis time is 5 minutes. The obtained [LiFe x mn 1-x PO 4 , (x=1)] the powder is collected for later use. Its XRD diffraction pattern is shown in figure 1 , SEM photo see figure 2 shown.

Embodiment 2

[0036] 1. Weighing of raw materials: Weigh 3.9g of lithium nitrate, 8.6g of iron phosphate, 3.2g of glucose and 19.2g of oxalic acid, and measure 1000mL of deionized water.

[0037] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0038] 3. Atomization: Pour the above solution into an atomizer, atomize to form droplets, and then introduce the droplets into the low-temperature zone (-196°C) of the freeze dryer to obtain solid powder.

[0039] 4. Drying: The solid powder is dried by a freeze dryer, and the obtained powder is rapidly pyrolyzed in a high-temperature furnace. The pyrolysis temperature is 750°C, and the pyrolysis time is 5 minutes. The obtained [LiFe x mn 1-x PO 4 , (x=1)] the powder is collected for later use. Its SEM photo see image 3 shown.

Embodiment 3

[0041] 1. Weighing of raw materials: Weigh 4.2g of lithium carbonate, 8.6g of iron phosphate, 3.2g of glucose and 19.2g of oxalic acid, and measure 1000ml of deionized water.

[0042] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0043] 3. Atomization: Pour the above solution into the atomizer and atomize to form mist.

[0044] 4. Drying: Then the mist is introduced into a hot air furnace (350°C) to dry to obtain a solid powder, and then the obtained solid powder is rapidly pyrolyzed in a high-temperature furnace with a pyrolysis temperature of 750°C and a pyrolysis time of 5 minutes , the resulting [LiFe x mn 1-x PO 4 , (x=1)] the powder is collected for later use. Its TEM picture is shown in Figure 4 As shown, the discharge capacity measured at different rates is shown in Figure 5 As shown, the discharge capacity and cycle life performance at different rates are shown in Figure 6 shown.

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Abstract

The invention relates to a spherical cathode material for a lithium-ion secondary battery and a preparation method of the spherical cathode material. The chemical composition of the spherical cathode material for the lithium-ion secondary battery is LiFe<x>Mn<1-x>PO<4>, x=0-1; the spherical structure is one of a solid sphere, a hollow sphere or a porous sphere; and the diameter is 5nm to 50 microns. The cathode material with a controllable spherical structure for the lithium-ion secondary battery is prepared by carrying out atomizing freeze-drying or atomizing heat-drying on a solution prepared from a lithium compound, an iron compound, a manganese compound, a phosphorus compound, a complexing agent and a carbon source and then carrying out high-temperature pyrolysis reaction. The preparation method provided by the invention can greatly shorten the sintering time of the cathode material for the lithium-ion secondary battery and avoids rapid growth of cathode material crystal for the lithium-ion secondary battery, so that the rapid charge-discharge performance of the cathode material for the lithium-ion secondary battery is improved. The cathode material for the lithium-ion secondary battery with the spherical structure is beneficial to subsequent preparation of a lithium-ion secondary all-battery, is also beneficial to full contact of the cathode material for the lithium-ion secondary battery and an electrolyte, shortens a diffusion path of lithium ions, and can improve the electrochemical properties of the cathode material for the lithium-ion secondary battery.

Description

technical field [0001] The present invention relates to spherical (solid sphere, hollow sphere, porous sphere) lithium ion secondary battery cathode material [LiFe x mn 1-x PO 4 , (x=1)] is the manufacturing technology field of the lithium ion secondary battery of cathode material, particularly relate to a kind of spherical lithium ion secondary battery cathode material [LiFe x mn 1-x PO 4 , (x=1)] and preparation method thereof. Background technique [0002] LiFe x mn 1-x PO 4 It is one of the preferred positive electrode materials for power lithium-ion secondary batteries. It has been vigorously promoted and used by various countries in recent years. Pollution, high energy density, no memory effect. But affect LiFe x mn 1-x PO 4 The disadvantage of going to practical use is that it has poor conductivity and is not suitable for high-current charging and discharging. There are two current improvement methods: one is to improve its electronic conductivity; the ot...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCH01M4/1397H01M4/5825H01M10/0525Y02E60/10
Inventor 唐月锋
Owner SUZHOU SUN SOURCE NANO TECH CO LTD
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