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Synthesis method of high-voltage phosphate lithium ion battery positive electrode material

A lithium phosphate and ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult processing, short cycle life, high specific surface area of ​​materials, etc., and achieve stable lattice structure, stable cycle performance, The effect of uniform composition

Inactive Publication Date: 2020-06-05
河北九丛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently manufactured high-voltage lithium iron phosphate (or lithium manganese iron phosphate) still has problems such as short cycle life, large self-discharge, and difficult processing of materials due to high specific surface area.
Many domestic companies are developing related cathode materials and battery products, but none of them have succeeded due to technical difficulties. For example, BYD proposed to apply this system to the field of electric vehicles in 2014, but it has not been realized so far.
[0007] The traditional synthesis of this material system generally uses manganese carbonate, ferrous oxalate, lithium carbonate, etc. as raw materials. The processing of the above materials is relatively difficult, especially during the grinding process, which is easily deteriorated, resulting in a substantial increase in slurry viscosity and a decrease in grinding efficiency. , resulting in uneven microscopic composition of the material, resulting in poor electrochemical performance of the material

Method used

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  • Synthesis method of high-voltage phosphate lithium ion battery positive electrode material
  • Synthesis method of high-voltage phosphate lithium ion battery positive electrode material
  • Synthesis method of high-voltage phosphate lithium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] to prepare LiMn 0.6 Fe 0.38 Mg 0.02 PO 4 / C material as an example, perform the following operations:

[0037] 32.2g of analytically pure lithium carbonate, 26.4g of ferric oxide, 45.4g of manganese dioxide, 100g of ammonium dihydrogen phosphate, 22.1g of glucose monohydrate and 0.7g of magnesium oxide were mixed with a V-type mixer for 2h, and then The mixed material is calcined at 600° C. for 2 hours in an air atmosphere to form a calcined material.

[0038] With calcined material, add 22.7g carbon source again, and add 205.7g water as grinding medium, put into high-speed ball mill and grind for 8 hours, obtain particle size D 50 It is a 0.85um abrasive slurry.

[0039] The grinding slurry is entered into a rake vacuum dryer, and dried under a vacuum of 0.01MPa at 100°C for 12 hours to obtain a reaction powder.

[0040] Put the above reaction powder into an electric furnace protected by a nitrogen atmosphere for sintering, the sintering temperature is 600°C, the...

Embodiment 2

[0059] 20.9g of analytically pure lithium hydroxide, 20.9g of ferric oxide, 46.5g of trimanganese tetroxide, 100g of ammonium dihydrogen phosphate and 9.5g of sucrose, were added with 0.5g of titanium oxide, mixed for 2h with a V-type mixer, and then The mixed material was calcined at 400° C. for 2 hours in an air atmosphere to form a calcined material.

[0060] With calcined material, add 16.7g carbon source again, and add 184g water as grinding medium, drop into high-speed ball mill and grind for 6 hours, obtain particle size D 50 It is a 0.65um abrasive slurry.

[0061] The grinding slurry is entered into a rake vacuum dryer, and dried under a vacuum of 0.01MPa at 150°C for 10 hours to obtain a reaction powder.

[0062] Put the above-mentioned reaction powder into an electric furnace protected by a nitrogen atmosphere for sintering at a temperature of 700°C for 24 hours, and then leave the furnace after cooling down to room temperature. By further pulverizing and sieving,...

Embodiment 3

[0064] to prepare LiMn 0.48 Fe 0.48 Mg 0.02 Al 0.02 PO 4 / C material as an example, perform the following operations:

[0065] 20.9g of analytically pure lithium hydroxide, 64.1g of ferrous oxalate, 36.3g of manganese dioxide, 100g of ammonium dihydrogen phosphate, 37.7g of polyethylene glycol, 0.8g of aluminum oxide and 0.4g of magnesium oxide were mixed with V-type Machine mixing for 2 hours, and then the mixed material was calcined at 500°C for 4 hours in an air atmosphere to form a calcined material.

[0066] With calcined material, add 26g carbon source again, and add 285g water as grinding medium, drop into high-speed ball mill and grind for 10 hours, obtain particle size D 50 It is a 0.45um abrasive slurry.

[0067] Put the grinding slurry into a rake vacuum dryer, and dry it under 0.01 MPa vacuum at 120° C. for 8 hours to obtain a dry reaction powder.

[0068] Put the above reaction powder into an electric furnace protected by a nitrogen atmosphere for sintering...

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Abstract

The invention discloses a synthesis method of a high-voltage phosphate lithium ion battery positive electrode material. The invention belongs to the technical field of lithium ion batteries. A lithiumsource, an iron source, a manganese source, a phosphorus source and a carbon source are used as raw materials; and a metal oxide is further added into the raw materials, the metal oxide is selected from one or any combination of titanium oxide, aluminum oxide, magnesium oxide and niobium pentoxide. The synthesis method comprises the following steps that A, the lithium source, the iron source, themanganese source, the phosphorus source, the carbon source and the metal oxide are calcined in the air atmosphere; B, taking the calcined material, adding the carbon source and a grinding medium, andcarrying out grinding; C, drying the grinding slurry in vacuum; and D, sintering the reaction powder in a protective atmosphere, cooling to room temperature, crushing and sieving to obtain the high-voltage phosphate lithium ion battery positive electrode material. The lithium ion battery manufactured by the synthesis method disclosed by the invention not only has the high-voltage characteristic of a ternary positive electrode battery, but also has the characteristics of high safety and low cost of a lithium iron phosphate battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, relates to a positive electrode material, in particular to a synthesis method of a high voltage phosphate lithium ion battery positive electrode material. The lithium ion battery manufactured by the synthesis method of the present invention has both the high voltage characteristics of the ternary positive electrode battery and the high safety and low cost characteristics of the lithium iron phosphate battery. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries. They have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in phones, laptops, and power tools. It also has good application prospects in electric vehicles, and is considered to be an important high-energy technology product in the 21st century...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 张克强
Owner 河北九丛科技有限公司
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