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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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 main

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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

Examples

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Example Embodiment

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

[0063] The nickel-cobalt compound, the lithium compound and the doping element compound are mixed and then calcined to obtain a matrix. The nickel-cobalt compound is the compound represented by formula I or the oxide obtained by oxidation of the compound represented by 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 lanthanides One or more of the elements;

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

[0069] The substrate and the coating ag...

Example Embodiment

[0115] Example 1

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

[0117] The nickel-cobalt-aluminum compound obtained above was uniformly mixed with lithium hydroxide and lanthanum nitrate for 1.5 hours, and the amount of the nickel-cobalt-aluminum compound and lithium hydroxide was such that the ratio of the total number of moles of Ni, Co and Al to the number of moles of Li was 1. : 1.06, the added amount of lanthanum nitrate is 0.5% of the mass of the above-mentioned nickel, cobalt and aluminum compound, and the mixture obtained above is calcined in an oxygen atmosphere at 800°C for 15 hours 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 0.5h, an aluminum nitrate solution with a mass concentration of 130g / L was added dropwise to it. The mass of the deionized water was 1.5 times the mass of th...

Example Embodiment

[0123] Example 2

[0124] The nickel sulfate solution, the cobalt sulfate solution and the manganese chloride solution are mixed uniformly to obtain a mixed solution, and the amount of the nickel sulfate solution, the cobalt sulfate solution and the manganese chloride solution is such that the molar ratio of nickel, cobalt and manganese is 0.8:0.1: 0.1, the total metal ion concentration in the mixed solution is 3mol / L;

[0125] The 15% by mass aqueous ammonia solution, the NaOH solution with a concentration of 3 mol / L, and the mixed solution are co-flowed into the reactor. The adding rate of the mixed solution is 15 mL / min, and the adding rate of the ammonia solution is 2mL / min, the NaOH solution was added at a rate of 4mL / min, heated and stirred at 50°C for precipitation reaction, the resulting reaction product was washed and dried at 100°C to obtain Ni 0.8 Co 0.1 Mn 0.1 (OH) 2 Nickel cobalt manganese compound;

[0126] The nickel-cobalt-manganese compound obtained above was unifor...

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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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