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Positive electrode active material, preparation method thereof and battery

A technology for positive electrode active materials and positive electrode sheets, which is applied in the field of positive electrode active materials and their preparation, and can solve problems such as poor conductivity of lithium iron phosphate, suppression of the gram capacity of positive electrode materials, and impact on battery rate performance

Inactive Publication Date: 2021-09-07
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0003] Traditional cladding materials are usually highly stable inorganic materials, such as Al 2 o 3 and solid electrolyte to improve the stability of the positive electrode material, but the disadvantage is that the gram capacity of the positive electrode material will be inhibited after coating
In addition, there is also a positive electrode material coated with lithium iron phosphate. Although its stability has been improved, the conductivity of lithium iron phosphate itself is poor, which affects the performance of the battery rate performance.

Method used

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  • Positive electrode active material, preparation method thereof and battery
  • Positive electrode active material, preparation method thereof and battery
  • Positive electrode active material, preparation method thereof and battery

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preparation example Construction

[0055] One embodiment of the present invention also provides a method for preparing the above positive electrode active material, comprising the following steps:

[0056] S110: preparing a lithium nickel manganese oxide colloid by using a sol-gel method, and sintering the lithium nickel manganese oxide colloid to obtain a shell material precursor.

[0057] In some embodiments, in step S110, the sintering temperature is 450°C-550°C.

[0058] In some embodiments, step S110 includes the following steps:

[0059] S111: Dissolve lithium acetate, manganese acetate and nickel acetate in water to obtain a mixed solution, add the mixed solution dropwise to an aqueous solution of citric acid, and control the pH of the solution to 6.2-6.8 at a temperature of 60°C-70°C Stir to obtain lithium nickel manganese oxide jelly.

[0060] In some embodiments, in step S111, the molar ratio of lithium acetate, manganese acetate and nickel acetate is 1.2:1.5:0.5.

[0061] In some embodiments, in s...

Embodiment 1

[0098] (1) Preparation of positive electrode active material

[0099] Dissolve lithium acetate, manganese acetate, and nickel acetate in deionized water at a molar ratio of 1.2:1.5:0.5, gradually add dropwise to 1M citric acid aqueous solution, control the pH to 6.5, and keep stirring at 65°C until viscous Colloidal lithium nickel manganese oxide colloid. The lithium nickel manganese oxide gel was heated to 110°C, dried for 12 hours, and sintered at 500°C for 6 hours to obtain the LNM precursor. Disperse 5 g of LNM precursor in 0.25 g of Co(NO 3 ) 2 ·6H 2 O aqueous solution, fully stirred and mixed, dried, and sintered at 600 °C for 6 hours to obtain Co-doped LNM materials.

[0100] The Co-doped LNM material was mixed with NCM precursor (the molar ratio of Ni, Co, Mn is shown in Table 1), and tantalum oxide was ball-milled in proportion for 12 hours (wherein, the total molar amount of nickel and manganese in tantalum oxide and LNM precursor The ratio is 1:19), then dried ...

Embodiment 2-8

[0107] (1) Preparation of positive electrode active material

[0108] Dissolve lithium acetate, manganese acetate, and nickel acetate in deionized water in proportion, gradually add dropwise to 1M citric acid aqueous solution, control the pH to 6.5, and keep stirring at 65°C until viscous gel-like nickel manganese acid Lithium gum. The lithium nickel manganese oxide gel was heated to 110°C, dried for 12 hours, and sintered at 500°C for 6 hours to obtain the LNM precursor. Disperse 5 g of LNM precursor in 0.25 g of Co(NO 3 ) 2 ·6H 2 O aqueous solution, fully stirred and mixed, dried, and sintered at 600 °C for 6 hours to obtain Co-doped LNM materials.

[0109] The LNM material was mixed with the NCM precursor (see Table 1 for the molar ratio of Ni, Co, and Mn) and tantalum oxide in proportion to ball milling for 12 hours (wherein the total molar ratio of nickel and manganese in tantalum oxide and LNM was 1:19) , and then dried and sintered at 750-900°C for 30 minutes to ob...

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Abstract

The invention relates to a positive electrode active material and a preparation method thereof, and a battery. The positive electrode active material comprises a core layer and a shell layer coating the core layer; the core layer material forming the core layer is a ternary positive electrode material, and the shell layer material forming the shell layer has the following chemical formula: LibNinMnpM<2-n-p>O4, wherein b is greater than or equal to 1 and less than or equal to 1.3, n is greater than or equal to 0.4 and less than or equal to 0.6, 2-n-p is greater than or equal to 0.005 and less than or equal to 0.2, and M is selected from one or more of Co, Mg, Ta, W, Nb, Zr, Ca, V, Mo, Cr, La, Sc, Lu, Y and B. According to the invention, the doped lithium nickel manganese oxide material is used for coating the ternary positive electrode material as the positive electrode active material, so the conductivity of the positive electrode active material and the stability under high-temperature and high-voltage conditions can be effectively improved, and on the premise of not influencing the capacity exertion of the ternary positive electrode material, the side reaction of the ternary positive electrode material and the electrolyte is inhibited, and the purposes of prolonging the service life and improving the rate capability of the battery are achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode active material, a preparation method thereof, and a battery. Background technique [0002] With the development of society, people have higher and higher requirements for battery energy density. Increasing the platform voltage and nickel content of NCM materials is an important method to increase the energy density of NCM system batteries. However, with the increase of charging voltage and nickel content, the unstable structure of the material and the increase of side reactions with the electrolyte lead to a continuous decline in the service life of the battery. Suppressing the side reaction between the electrolyte and the cathode material by coating is the main method to improve the stability of the high-voltage cathode material. [0003] Traditional cladding materials are usually highly stable inorganic materials, such as Al 2 o 3 And solid electroly...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/525H01M4/505H01M4/485H01M4/628H01M4/364H01M4/366H01M10/0525H01M2004/028Y02E60/10
Inventor 高一琳梁世硕李冰
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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