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High nickel anode material, preparation method thereof and lithium ion battery

A cathode material, high nickel technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery safety and thermal stability, reduced battery electrochemical performance, damage to the crystal structure of the material surface, etc. Effects of chemical stability and safety, good electrochemical stability and safety, good capacity and cycle performance

Active Publication Date: 2015-11-18
湖北容百锂电材料有限公司
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AI Technical Summary

Problems solved by technology

[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 are poor, which limits its wide application; LiNiO 2 The structural features of LiCoO 2 Basically the same, but pure phase LiNiO 2 The material is not easy to prepare, and lithium and nickel ions in its crystal structure will be mixed, which will cause a decrease in the electrochemical performance of the battery. Therefore, LiNiO 2 The application as a positive electrode material has been greatly limited; in order to overcome the above problems, researchers have improved its electrochemical stability by doping other metal ions (Co, Mn, Al, Mg, etc.) in the nickel ion layer; after doping The high nickel cathode material LiNi 1-x m x o 2 (M is Co, Mn, Al, Ti, etc.) not only has high capacity and excellent cycle performance, but also has improved safety performance; 2 High, and with the increase of Ni content, the amount of residual alkali on the surface increases, and the residual alkali is mainly Li 2 O. Li 2 CO 3 , LiOH and other forms, alkaline substances are very easy to absorb moisture in the air, so that the surface of the high-nickel positive electrode material reacts with water, causing the positive electrode material to become viscous and even gelatinous during slurry mixing, bringing excess water into the battery In the process, the amount of lithium salt in the battery will increase, causing side reactions in the battery to increase the internal resistance of the battery, resulting in a decrease in the capacity and cycle performance of the battery, and may also cause the battery to appear flatulence
[0004] The easiest way to reduce the residual alkali on the surface of the above-mentioned high-nickel cathode material is to increase the water washing step in the preparation process; however, during the washing process of the preparation of the high-nickel cathode material, the surface of the material is very sensitive to moisture, and chemical delithiation reaction is very easy to occur , leading to the destruction of the surface crystal structure of the material, so that the capacity and cycle performance of the lithium-ion battery prepared by the positive electrode material are poor

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  • High nickel anode material, preparation method thereof and lithium ion battery
  • High nickel anode material, preparation method thereof and lithium ion battery
  • High nickel anode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0062] The present invention provides a method for preparing the high-nickel positive electrode material described in the above technical solution, comprising:

[0063] The compound of nickel-cobalt, lithium compound and doping element compound are mixed and then calcined to obtain the matrix, and the compound of nickel-cobalt is the compound shown in formula I or the oxide obtained by oxidation of the compound shown in formula I:

[0064] Ni 1-x-y co x m y (OH) 2 Formula I,

[0065] In formula I, 0.05≤x≤0.30, 0.01≤y≤0.20,

[0066] M is one or more of Mn, Al, Ti, Mg, Zr, Ca, Zn, Sr, La and B;

[0067] The doping elements in the doping element compound are Al, Ti, Mg, Zr, Ca, Zn, B, F, V, Sr, Ba, Y, Nd, Cs, W, Mo, Ru, Rd and lanthanide one or more of the elements;

[0068] The amount of the nickel-cobalt compound and the lithium compound makes the ratio of the total moles of Ni, Co and M to the moles of Li be 1:(0.9~1.15);

[0069] mixing the substrate and the coating a...

Embodiment 1

[0116] Prepare nickel-cobalt-aluminum compound according to the method described in Comparative Example 1 of the present invention;

[0117] The nickel-cobalt-aluminum compound obtained above is uniformly mixed with lithium hydroxide and lanthanum nitrate for 1.5 h, and the amount of the nickel-cobalt-aluminum compound and lithium hydroxide is such that the ratio of the total moles of Ni, Co and Al to the moles of Li is 1 : 1.06, the addition of lanthanum nitrate is 0.5% of the mass of the above-mentioned nickel-cobalt-aluminum compound, the mixture obtained above is calcined at 800° C. for 15 hours in an oxygen atmosphere, and then crushed and sieved to obtain a doped product;

[0118] After stirring the above-mentioned doped product in deionized water at 60° C. for 0.5 h, an aluminum nitrate solution with a mass concentration of 130 g / L was added dropwise thereto, and the quality of the deionized water was 1.5 times the mass of the above-mentioned doped product. The quality ...

Embodiment 2

[0124] Nickel sulfate solution, cobalt sulfate solution and manganese chloride solution are mixed homogeneously, obtain mixed solution, the consumption of described nickel sulfate solution, cobalt sulfate solution and manganese chloride solution makes the mol ratio of nickel, cobalt and manganese be 0.8:0.1: 0.1, the total metal ion concentration in the mixed solution is 3mol / L;

[0125] The ammonia solution that is 15% by mass percentage content, the NaOH solution that concentration is 3mol / L and described mixed solution flow into the reaction kettle concurrently, the addition speed of described mixed solution is 15mL / min, the addition speed of ammonia solution is 2mL / min, the addition rate of NaOH solution is 4mL / min, heating and stirring at 50°C for precipitation reaction, washing the obtained reaction product and drying at 100°C to obtain Ni 0.8 co 0.1 mn 0.1 (OH) 2 Nickel-cobalt-manganese compounds;

[0126] The nickel-cobalt-manganese compound obtained above is unifo...

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Abstract

The invention provides a high nickel anode material, which comprises a base body and a coating layer, wherein aluminum (Al), titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), zinc (Zn), boron (B), fluorine (F), vanadium (V), strontium (Sr), barium (Ba), yttrium (Y), neodymium (Nd), caesium (Cs), tungsten (W), molybdenum (Mo), ruthenium (Ru), rubidium (Rb) or lanthanides are mingled on the surface of the base body, the coating layer is coated on the surface of the base body, and comprises one or more of the magnesium, the titanium, the zirconium, the fluorine, the boron, the aluminum and phosphate. The elements are mingled on the surface of the base body of the high nickel anode material, the mingled elements can stabilize a surface crystal structure of the base body, remit damage of washing liquid to a material surface structure of the base body, and enable capacity and cycle performance of a lithium ion battery which is prepared through the high nickel anode material to be better. Furthermore, the high nickel anode material is provided with the coating layer, and the coating layer enables the high nickel anode material to separate from an electrolyte part, and improves electrochemical stability and safety of the high nickel anode material. The invention further provides a method for preparing the high nickel anode material and a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a high-nickel positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Today, the increasing importance of energy storage technology has made rechargeable lithium-ion batteries (LIBs) gradually occupy a dominant position in the field of electronic consumer power supplies. Lithium-ion batteries have the advantages of high energy storage density, good safety, high charge-discharge rate, low maintenance costs and long service life. Lithium-ion batteries are widely used in daily life. [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 are poor, whi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525H01M4/62
CPCH01M4/1391H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 于建佘圣贤袁徐俊陈涨宗温美盛罗江鲲应皆荣
Owner 湖北容百锂电材料有限公司
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