A mg/ti co -doped li 3 PO 4 Covering high -nickel ternary positive poles and preparation methods

A positive electrode material and co-doping technology, applied in chemical instruments and methods, nickel compounds, electrical components, etc., can solve problems that hinder practical applications, safety issues, poor thermal stability and chemical stability, and achieve a reduction in electrochemical Impedance and electrolyte side reactions, reducing H2→H3 phase transition, and suppressing the effect of surface oxygen loss

Active Publication Date: 2022-08-05
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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  • A mg/ti co -doped li <sub>3</sub> PO <sub>4</sub> Covering high -nickel ternary positive poles and preparation methods
  • A mg/ti co -doped li <sub>3</sub> PO <sub>4</sub> Covering high -nickel ternary positive poles and preparation methods
  • A mg/ti co -doped li <sub>3</sub> PO <sub>4</sub> Covering high -nickel ternary positive poles and preparation methods

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 a high-speed mixer and mix well to obtain a mixture;

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

[0038] (3), fully premix the primary sintered material with a mass ratio of 3% lithium phosphate, add it to the mixer, use a mixing speed of 600 rpm and a mi...

Embodiment 2

[0040] (1), weigh a certain amount of Ni 0.83 Co 0.10 Mn 0.07 (OH) 2 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, and they are added together in a high-speed mixer and fully mixed Homogeneous to obtain a mixture;

[0041] (2) The obtained mixture was first sintered at low temperature, then sintered at 500°C for 8h in an oxygen atmosphere; then the temperature was raised to 850°C, kept for 10h, and the Mg / Ti doped matrix material was obtained after natural cooling and 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 at 650°C for 6h in an oxygen atmosphere, After natural cooling, Mg / Ti double-doped Li was obtained ...

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, in which 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 and fully Mix evenly to obtain a mixture;

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

[0046] (3) Fully mixing the obtained primary sintered product with 3% lithium phosphate by mass, using a mixing speed of 600 rpm and a mixing time of 3 hours; secondary sintering at 650°C for 6 hours in an oxygen atmosphere, and Mg / Ti double-doped after natural cooling and cooling Li 3 PO 4 Coated cathode material.

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Abstract

In order to improve the electrochemical stability of the high-nickel ternary positive electrode material and improve the rate performance and cycle performance of the battery, the present invention provides a Mg / Ti co-doped Li 3 PO 4 A method for preparing a coated high-nickel ternary positive electrode material. Using high-nickel precursors as raw materials, nickel-cobalt-manganese precursors, lithium sources, magnesium compounds and titanium compounds are added together in a high-speed mixer in a certain proportion to be fully mixed, and pre-fired at low temperature and then high-temperature calcined in an oxygen atmosphere to obtain doped Matrix material; the obtained doped matrix material and the lithium phosphate compound are fully mixed in a mixer according to a certain proportion, and are sintered for secondary sintering in an oxygen atmosphere to obtain a lithium phosphate-coated cathode material. The process of the invention is simple, the layered distribution of the Mg / Ti double dopant can enhance the surface stability and the crystal structure stability at the same time, and the Li 3 PO 4 The coating layer helps to reduce the electrochemical impedance and electrolyte side reactions, thereby improving the thermal stability and cycle performance of the high-nickel ternary cathode material.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, 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 applications such as electric vehicles, the demand for high-energy batteries continues to increase, and 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 a 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, and 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, high-nickel ternary cathode materials have poor thermal and chemical stability, which can ea...

Claims

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Application Information

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Patent Type & Authority Patents(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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