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Mg/Ti co-doped Li3PO4 coated high-nickel ternary positive electrode material and preparation method thereof

A positive electrode material and co-doping technology, applied in chemical instruments and methods, nickel compounds, electrical components, etc., can solve safety problems, hinder practical applications, poor thermal stability and chemical stability and other problems

Active Publication Date: 2021-05-18
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel ternary cathode materials have poor thermal and chemical stability, which can easily lead to serious safety problems especially in the deep charge and discharge state, hindering their wide practical application.

Method used

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  • Mg/Ti co-doped Li3PO4 coated high-nickel ternary positive electrode material and preparation method thereof
  • Mg/Ti co-doped Li3PO4 coated high-nickel ternary positive electrode material and preparation method thereof
  • Mg/Ti co-doped Li3PO4 coated high-nickel ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1), weigh a certain amount of Ni 0.88 co 0.08 mn 0.04 (OH) 2 High-nickel ternary precursor, lithium hydroxide, magnesium carbonate and titanium oxide, wherein the input amount of lithium hydroxide is 1.04:1 according to the molar ratio of lithium and nickel-cobalt-manganese system, and the doping amount of magnesium carbonate and titanium oxide is 0.02% respectively and 0.05%. Add the premixed mixture into the high-speed mixer and mix well to obtain the mixture;

[0037] (2) The obtained mixture is sintered at a low temperature in an oxygen atmosphere, the sintering temperature is 500°C, and the sintering time in the main temperature zone is 8h; then the temperature is raised to 800°C, kept for 10h, and the Mg / Ti doping is obtained after natural cooling Matrix material.

[0038] (3) Fully premix the primary sintered material with a mass ratio of 3% lithium phosphate, add it into the mixer, use a mixing speed of 600rpm, and mix for 3h; secondly sinter at 650°C for ...

Embodiment 2

[0040] (1), weigh a certain amount of Ni 0.83 co 0.10 mn 0.07 (OH) 2 The ternary precursor, lithium hydroxide, 0.04% doped magnesium carbonate and titanium oxide, wherein the input amount of lithium hydroxide is 1.04:1 according to the molar ratio of lithium and nickel-cobalt-manganese system, are added to the high-speed mixer and mixed thoroughly Homogeneously, a mixture is obtained;

[0041] (2) The obtained mixture was first sintered at low temperature, and sintered at 500° C. for 8 hours in an oxygen atmosphere; then the temperature was raised to 850° C., kept for 10 hours, and the Mg / Ti doped matrix material was obtained after natural cooling.

[0042] (3), fully premix the primary sintered product obtained in step (2) with lithium phosphate, wherein the mass ratio of lithium phosphate is 2%, the mixing speed is 600rpm, and the mixing time is 3h; the secondary sintering is 6h at 650°C under an oxygen atmosphere, Mg / Ti double-doped Li obtained after natural cooling 3 PO...

Embodiment 3

[0044] (1), weigh a certain amount of Ni 0.83 co 0.10 mn 0.07 (OH) 2 High-nickel ternary precursor, lithium hydroxide, wherein the input amount of lithium hydroxide is 1.06:1 according to the molar ratio of lithium and nickel-cobalt-manganese system, and magnesium carbonate and titanium oxide with 0.05% doping amount are added to the high-speed mixer to fully Mix well to get a mixture;

[0045] (2) The obtained mixture was sintered at 500° C. for 8 hours in an oxygen atmosphere; then the temperature was raised to 870° C., kept for 10 hours, and the Mg / Ti doped matrix material was obtained after natural cooling.

[0046] (3) Fully mix the obtained primary sintered product with 3% mass ratio lithium phosphate, the mixing speed is 600rpm, and the mixing time is 3h; the secondary sintering is at 650°C for 6h under an oxygen atmosphere, and the Mg / Ti double-doped Li 3 PO 4 coated cathode material.

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Abstract

The invention provides a preparation method of an Mg / Ti co-doped Li3PO4 coated high-nickel ternary positive electrode material in order to improve the electrochemical stability of the high-nickel ternary positive electrode material and improve the rate capability and cycle performance of a battery. The preparation method comprises the following steps: by taking a high-nickel precursor as a raw material, adding a nickel-cobalt-manganese precursor, a lithium source, a magnesium compound and a titanium compound into a high-speed mixer according to a certain proportion, fully conducting mixing, conducting pre-sintering at a low temperature in an oxygen atmosphere, and then conducting calcining at a high temperature to obtain a doped matrix material; and fully mixing the obtained doped matrix material and a lithium phosphate compound in a mixing machine according to a certain proportion, and carrying out secondary sintering under an oxygen atmosphere condition to obtain the lithium phosphate coated positive electrode material. The preparation method is simple in process, the Mg / Ti double-dopant layered distribution can enhance the surface stability and the crystal structure stability at the same time, and the Li3PO4 coating layer is beneficial to reduction of electrochemical impedance and electrolyte side reaction, so that the thermal stability of the high-nickel ternary positive electrode material is improved, and the cycle performance of the high-nickel ternary positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, in particular to a Mg / Ti co-doped Li 3 PO 4 A coated high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for high-energy batteries in applications such as electric vehicles, lithium-ion batteries will undoubtedly have a greater impact on our lives in the coming years. The cathode material is the most critical part of the lithium-ion battery, and its cost accounts for one-third of the entire battery. In recent years, layered cathode materials have received extensive research attention. High-nickel ternary cathode materials (LiNi x co y mn 1-x-y o 2 , NMC) are the most promising candidates due to their high energy density and potential low cost. However, the poor thermal and chemical stability of high-nickel ternary cathode materials, especially in the deep charge and discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01G53/00H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01B25/30C01G53/66H01M4/628H01M4/624H01M4/505H01M4/525H01M10/0525C01P2004/03Y02E60/10
Inventor 陈金丽张新龙赵云虎秦锦
Owner NANTONG RESHINE NEW MATERIAL
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