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Bulk phase-doped modified lithium ion battery positive electrode material and its preparation method

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of reducing specific energy density, reducing material bulk density, etc., and achieves lower synthesis temperature, simple preparation process, and environmental friendliness. Effect

Inactive Publication Date: 2006-06-28
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of inert particle carbon will reduce the bulk density of the material and thereby reduce its specific energy density [Journal of the Electrochemical Society, 2002, 149(9) A1184-A1189]

Method used

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  • Bulk phase-doped modified lithium ion battery positive electrode material and its preparation method
  • Bulk phase-doped modified lithium ion battery positive electrode material and its preparation method
  • Bulk phase-doped modified lithium ion battery positive electrode material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Put 0.25 moles of lithium carbonate, 0.475 moles of ferrous oxalate dihydrate, 0.025 moles of titanium dioxide and 0.5 moles of ammonium dihydrogen phosphate in an agate mortar and mix evenly, add an appropriate amount of distilled water, and grind it until the rheological phase, at 100 ℃ for 12 hours to obtain a precursor; move the precursor into a high-temperature furnace, and under the protection of nitrogen, raise the temperature to 400°C at a rate of 2°C / min, keep the temperature for 5 hours, and then lower it to room temperature to obtain a pyrolysis precursor Put the obtained pyrolysis precursor in an agate mortar, add ethanol and grind until rheological state, raise the temperature to 750°C at a rate of 2°C / min, keep the temperature for 20 hours, and then lower it to room temperature to obtain LiFe 0.95 Ti 0.05 PO 4 Material. The first discharge capacity of the assembled battery is 143mAhg -1 , The discharge platform voltage is 3.40V, and the capacity retenti...

Embodiment 2

[0018] Put 0.5 mole of lithium hydroxide monohydrate, 0.475 mole of ferrous oxalate dihydrate, 0.025 mole of magnesium oxide and 0.5 mole of ammonium dihydrogen phosphate in an agate mortar and mix evenly, add an appropriate amount of ethanol, and grind it until it flows Change the phase and keep the temperature at 60°C for 1 hour to obtain the precursor; move the precursor into a high-temperature furnace, and under the protection of nitrogen, raise the temperature to 400°C at a rate of 2°C / min, keep the temperature for 5 hours, and then lower it to room temperature to prepare Obtain the pyrolysis precursor; put the obtained pyrolysis precursor in an agate mortar, add ethanol and grind until rheological state, raise the temperature to 700°C at a rate of 2°C / min, keep the temperature for 20 hours, and then lower it to room temperature to obtain LiFe 0.95 Mg 0.05 PO 4 Material. The first discharge capacity of the assembled battery is 141mAhg -1 , the discharge platform voltag...

Embodiment 3

[0020] Put 0.5 mole of lithium acetate dihydrate, 0.485 mole of ferrous oxalate dihydrate, 0.015 mole of zinc oxide and 0.5 mole of diammonium hydrogen phosphate in an agate mortar and mix evenly, add an appropriate amount of ethanol, and grind it until the rheological phase , at 60°C for 1 hour to obtain a precursor; move the precursor into a high-temperature furnace, under the protection of nitrogen, raise the temperature to 400°C at a rate of 2°C / min, keep the temperature for 5 hours, and then lower it to room temperature to obtain Pyrolysis precursor; put the obtained pyrolysis precursor in an agate mortar, add ethanol and grind until rheological state, raise the temperature to 700°C at a rate of 2°C / min, keep the temperature for 20 hours, and then lower it to room temperature to obtain LiFe 0.97 Zn 0.03 PO 4 Material. The first discharge capacity of the assembled battery is 138mAhg -1 , the discharge platform voltage is 3.39V, and the capacity retention rate of the bat...

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Abstract

This invention relates to a Li ionic battery positive material lithium ferrous orthophosphate after doping and modifying the bulk phase and a preparation method for the applied rheo-phase reaction, in which, the positive material of the Li ionic battery is composed of: LixFeyMzPO4, in which, M is selected from the following elements: Mg, Al, Ca, Ni, Zn, Cu, Ti, Mn and Zr and a compound with Fe, a doped element compound and a compound with P are mixed in proportion to be added with ethanol, water or their mixture to be milled to form a rheo-phase to be kept at the constant temperature of 60-100deg.C for 0.5-20 hours to be moved to a high temperature furnace and pre-processed for 2-20 hours under 200-500deg.C and baked processed for 5-48 hours under 550-900deg.C in inert gas and the temperature is reduced to room temperature to get the product.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion storage battery and a preparation method thereof, in particular to a lithium iron phosphate lithium ion storage battery positive electrode material modified by bulk phase doping and a rheological phase reaction preparation method thereof. Background technique [0002] As a cathode material for lithium-ion batteries, layered LiCoO 2 It has been commercialized for a long time, but the raw materials are expensive and pollute the environment. Layered LiNiO 2 Although it has the advantages of easy-to-obtain raw materials and less environmental pollution, its commercialization process is limited by its poor cycle performance, poor high-temperature stability, poor safety, and harsh synthesis process conditions. Spinel LiMnO 4 Although the price is low, it is environmentally friendly, and it can be charged and discharged with a large current, but its structure is prone to change during ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M4/62
CPCY02E60/10
Inventor 刘兴泉孙玉恒
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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