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A high-nickel cathode material, a preparation method thereof, and a lithium ion battery

A positive electrode material, high nickel technology, applied in the field of high nickel positive electrode material and its preparation, can solve the problems such as the discharge capacity and cycle characteristics are not exerted, and achieve accelerated electrochemical insertion-extraction rate, stable lattice structure, and improved discharge. The effect of capacity and cycle life

Inactive Publication Date: 2019-01-18
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Application Information

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Problems solved by technology

However, the high-nickel positive electrode ternary material with the above-mentioned main content ratio has the problem that the discharge capacity and cycle characteristics have not exerted the level they should have.

Method used

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  • A high-nickel cathode material, a preparation method thereof, and a lithium ion battery
  • A high-nickel cathode material, a preparation method thereof, and a lithium ion battery
  • A high-nickel cathode material, a preparation method thereof, and a lithium ion battery

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preparation example Construction

[0055] The present invention also provides a method for preparing the above-mentioned high-nickel positive electrode material, comprising the following steps:

[0056] A) calcining after mixing the nickel-cobalt-manganese hydroxide, the lithium-containing compound and the compound containing the element M, to obtain the substrate;

[0057] Described nickel cobalt manganese hydroxide is the compound shown in formula II:

[0058] Ni 1-x-y co x mn y (OH) 2 Formula II,

[0059] In formula II, 2y≤x≤0.40, 0.00

[0060] The element M is one of Al, Mg, Ti, Zr, Mn, Ni, Sn, Co, Zn, W, Mo, Ru, Ca, Sr, Ba, B, Y, V, Nb and lanthanide elements or more;

[0061] The ratio of the total moles of Ni, Co and Mn in the nickel-cobalt-manganese hydroxide to the moles of lithium in the lithium-containing compound is 1:(0.95-1.15);

[0062] B) wash and dry the base material, mix it with a coating agent, and sinter it to obtain a high-nickel positive electrode material. The coating ag...

Embodiment 1

[0106] According to the molar ratio of Ni:Co:Mn being 0.83:0.12:0.05, mix uniformly to obtain a mixed solution; the concentration of metal ions in the mixed solution is 2.0mol / L;

[0107] Use a peristaltic pump to add 5mol / L ammonia solution and 3mol / L NaOH solution and the mixed solution into the reaction kettle, heat and stir at 50°C for precipitation reaction, wash the obtained reaction product and dry it at 100°C, get Ni 0.83 co 0.12 mn 0.05 (OH) 2 compound;

[0108] The nickel cobalt manganese hydroxide obtained above is uniformly mixed with lithium hydroxide and magnesium oxide for 2 hours, and the amount of nickel cobalt manganese hydroxide and lithium hydroxide is such that the ratio of the total moles of Ni, Co and Mn to the moles of Li The ratio is 1:1.04, the amount of magnesium oxide added is 0.5% of the mass of the above-mentioned nickel-cobalt-manganese hydroxide, the mixture obtained above is calcined at 800°C for 15 hours in an oxygen atmosphere, and then c...

Embodiment 2

[0119] According to the molar ratio of Ni:Co:Mn being 0.88:0.09:0.03, mix uniformly to obtain a mixed solution; the concentration of metal ions in the mixed solution is 2.5mol / L;

[0120] Use a peristaltic pump to add 8mol / L ammonia solution and 3mol / L NaOH solution and the mixed solution into the reaction kettle, heat and stir at 50°C for precipitation reaction, wash the obtained reaction product and dry it at 100°C, get Ni 0.88 co 0.09 mn 0.03 (OH) 2 compound;

[0121] The nickel cobalt manganese hydroxide obtained above is uniformly mixed with lithium hydroxide and lanthanum nitrate for 2 hours, and the nickel cobalt manganese hydroxide and lithium hydroxide are used so that the ratio of the total moles of Ni, Co and Mn to the moles of Li The ratio is 1:1.06, the amount of lanthanum nitrate added is 1% of the mass of the above-mentioned nickel-cobalt-manganese hydroxide, the mixture obtained above is calcined at 730°C for 15 hours in an oxygen atmosphere, and then crush...

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Abstract

The invention provides a high-nickel cathode material. The high nickel cathode material Co / Mn >= 2 provided by the invention increases the proportion of the layered structure in the material and accelerates the electrochemical intercalation-stripping rate of lithium ions in the cathode material. The discharge capacity and cycle characteristics can be effectively improved. In addition, the residualLi on the surface of the material is removed by detergent, thus effectively reducing the residual alkali content and pH value of the finished product; At the same time, the doping element can effectively stabilize the internal lattice structure of the material, improve the electrochemical stability and safety of the cathode material. The coating can not only increase the discharge capacity of thematerial by accelerating the Li + desembedding speed, but also alleviate the damage of the electrolyte to the surface structure of the material, and improve the discharge capacity and cycle life of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-nickel positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage systems. Due to the increasingly prominent global energy and environmental issues, lithium-ion batteries are gradually moving towards the field of electric vehicles. Therefore, higher requirements are placed on the energy density, cycle life and safety performance of lithium-ion batteries. [0003] In the field of research and application of cathode materials for lithium-ion batteries, layered transition metal oxides have been widely concerned, among which LiCoO 2 It has achieved great success in the application of small lithium-ion batteries, but the safety and thermal stability of this battery...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘志远佘圣贤袁徐俊于建马娇胡常青谢恒斌孟祥鹤王碧军黄连友
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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