A modified lithium-ion battery precursor, positive electrode material, and preparation method of the precursor and positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, secondary batteries, etc., can solve the problems of precursor trace element doping and coating, design and control, and unfavorable performance of positive electrode materials. Achieve the effect of facilitating insertion and extraction, easy control of the process, and reduction of the content of inert elements

Active Publication Date: 2020-01-10
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Description
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Problems solved by technology

[0005] Although the above-mentioned published patent can produce a spherical positive electrode material precursor with uniform composition, it does not do trace element doping and coating on the precursor, and does not design and control the existence form of trace elements and the structure of the material, so as not to Conducive to the performance of positive electrode materials

Method used

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  • A modified lithium-ion battery precursor, positive electrode material, and preparation method of the precursor and positive electrode material
  • A modified lithium-ion battery precursor, positive electrode material, and preparation method of the precursor and positive electrode material
  • A modified lithium-ion battery precursor, positive electrode material, and preparation method of the precursor and positive electrode material

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Effect test

Embodiment 1

[0037] Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate according to the metal molar ratio of 82:12:6 to obtain a 2mol / L mixed salt solution, dissolve calcium nitrate into a calcium nitrate solution with a concentration of 0.1mol / L, and dissolve aluminum nitrate Aluminum nitrate solution with a concentration of 0.5mol / L; sodium hydroxide dissolved into an alkali solution with a concentration of 6mol / L; ammonia water dissolved into a complexing agent solution with a concentration of 5mol / L.

[0038] 20L of mixed salt solution, calcium nitrate solution, alkali solution, and complexing agent solution are added to the reaction kettle in parallel flow for reaction, the stirring speed is kept constant at 500rpm during the process, and the flow rate of the mixed salt solution is controlled at 400mL / h. The solution inlet flow rate is 16mL / h, the reaction pH is 11.9-12.1, the reaction temperature is 50°C, and the concentration of ammonia in the reaction system is controlle...

Embodiment 2

[0045] Dissolve nickel nitrate and cobalt nitrate according to the metal molar ratio of 88:9 to obtain a 1mol / L mixed salt solution; mix aluminum nitrate and sodium hydroxide according to a molar ratio of 1:5 to obtain an aluminum ion concentration of 0.3mol / L solution; dissolving zirconium nitrate into concentration is the zirconium nitrate solution of 0.05mol / L; dissolving cerium nitrate into concentration is the cerium nitrate solution of 0.05mol / L; dissolving magnesium sulfate into concentration is the magnesium sulfate solution of 0.25mol / L; Dissolve sodium hydroxide into an alkali solution with a concentration of 4mol / L; dissolve ammonia water into a complexing agent solution with a concentration of 3mol / L.

[0046] Add 20L mixed salt solution, aluminum solution, zirconium nitrate solution, cerium nitrate solution, alkali solution, and complexing agent solution into the reactor for reaction, keep the stirring speed constant at 600rpm, and control the flow rate of the mixe...

Embodiment 3

[0050] Dissolve nickel sulfate, cobalt chloride, and manganese chloride according to the metal molar ratio of 60:20:20 to obtain a 2.5mol / L mixed salt solution; dissolve lanthanum nitrate into a lanthanum nitrate solution with a concentration of 0.1mol / L; TiO 2 The nanopowder was formulated into TiO with a concentration of 0.2mol / L 2 Suspension: Dissolve sodium hydroxide into an alkali solution with a concentration of 10mol / L; dissolve ammonia water into a complexing agent solution with a concentration of 12mol / L.

[0051] Add 20L mixed salt solution, lanthanum nitrate solution, alkali solution, and complexing agent solution into the reaction kettle in parallel flow to react, keep the stirring speed constant at 650rpm during the process, and control the mixed salt solution inlet flow rate to 200mL / h at the same time, lanthanum nitrate The solution inlet flow rate is 10mL / h, the reaction pH is 11.2-11.4, the reaction temperature is 60°C, and the concentration of ammonia in the...

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Abstract

The invention provides a modified precursor for a lithium ion battery, a positive electrode material and a preparation method of the precursor and the positive electrode material. The precursor is a spherical metal hydroxide, the molecular formula of the precursor is NixCoyMzM1aM2d(OH)2+e, M is Mn or Al, M1 is an element with the ion radius larger than 0.76 angstrom, M2 is an element with the ionradius smaller than 0.76 angstrom, 0.55<=x<=0.96, 0.02<=y<=0.25, 0.01<=z<=0.25, 0.0005<=a<=0.005, 0.0002<=d<=0.005, x+y+z+a+d=1, 0<=e<=0.06, the M1 element is uniformly distributed on a material bodyphase, and the M2 element is uniformly distributed on the surface of the material. The precursor is novel in structure, and the prepared positive electrode material has better capacity, circulation and safety performances. The preparation method is easy to stably control, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The present invention relates to a modified lithium-ion battery precursor, a positive electrode material and a preparation method thereof, in particular to a doped and coated spherical metal hydroxide precursor, and a positive electrode prepared from the precursor The material and the preparation method of the precursor and positive electrode material belong to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries are currently the most common secondary batteries, with outstanding advantages such as high energy density, good cycle performance, small self-discharge, and no memory effect. They are widely used in various portable electric tools, mobile phones, notebook computers, tablet computers, Camcorders, weaponry, etc. have also been used on a large scale in electric vehicles and various energy storage fields. [0003] In recent years, my country's new energy automobile industry has developed rapidly. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/50C01P2004/61H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 宋顺林张朋立郑长春刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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