Positive electrode active material and preparation method thereof, and lithium secondary battery

A technology of positive electrode active materials and secondary particles, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of uneven lithium deintercalation state and battery capacity attenuation, so as to improve cycle stability and improve secondary particles. Crushing, easy-to-control effects

Active Publication Date: 2020-08-28
HUAWEI TECH CO LTD
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Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a positive electrode active material. By forming a closed-pore structure inside the primary particle, the closed-pore structure can effectively release the anisotropic volume change of the layered positive electrode active material during the charging and discharging process of the battery. The internal stress maintains the integrity of the primary particle structure, thereby ensuring th...

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

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[0048] Correspondingly, an embodiment of the present invention also provides a method for preparing the above positive electrode active material, including the following steps:

[0049] S101. Mix the metal salt and hydrophilic nanoparticles to prepare a mixed solution, so that the hydrophilic nanoparticles are uniformly dispersed in the mixed solution, and the metal ions in the metal salt are in the hydrophilic nanoparticles surface adsorption;

[0050] S102. Add an alkaline material to the mixed solution, make the metal ions use the hydrophilic nanoparticles as nucleation points, and co-precipitate to obtain a positive electrode active material precursor, and the hydrophilic nanoparticles are evenly distributed in the Inside the positive electrode active material precursor;

[0051] S103. Uniformly mix the precursor of the positive electrode active material with the lithium salt, and perform heat treatment in an oxidative atmosphere to obtain the positive electrode active ma...

Embodiment 1

[0067] A kind of nickel cobalt lithium manganese oxide LiNi 0.6 co 0.2 m 0.2 o 2 (NCM622) The preparation method of ternary cathode active material, comprises the steps:

[0068] S101. Add acetylene black with an average particle size of 30nm-45nm into concentrated nitric acid, heat under reflux to 80°C for oxidation treatment for 12 hours, modify the surface of the inert acetylene black with hydrophilic oxygen-containing functional groups, and redisperse in the In water, obtain acetylene black aqueous dispersion liquid, wherein, the concentration of acetylene black nanoparticles is 0.1g / L; Nickel sulfate (NiSO 4 ), cobalt sulfate (CoSO 4 ), manganese sulfate (MnSO 4 ) according to the ratio of molar ratio Ni:Co:Mn=6:2:2 is added in the described acetylene black water dispersion liquid, is configured into the metal salt solution that metal ion total concentration is 2mol / L; And the ammonia of configuration 5mol / L aqueous solution and 10mol / L sodium hydroxide solution;

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Abstract

The embodiment of the invention provides a positive electrode active material, which comprises a secondary particle formed by tightly stacking a plurality of primary particles, wherein closed pores are formed in the primary particles, the sizes of the closed pores are within the range of 1 to 300 nm, the primary particle comprises a compound LicNiaCobM1-a-bO2-dXd, M is selected from one or more ofMn, Al, Na, Mg, Ca, Zr, Sr, Ti, Cr, V, W, Si, Ga, Sn, lanthanide series elements and actinide series elements, X is selected from one or more of B, F, Cl and S, a is greater than or equal to 0 and less than or equal to 1, b is greater than or equal to 0 and less than or equal to 1, c is greater than or equal to 0.8 and less than or equal to 1.5, and d is greater than or equal to 0 and less than or equal to 0.5. According to the invention, the closed pores in the primary particles of the positive electrode active material can effectively release internal stress caused by volume change of the material in the lithium intercalation and deintercalation process, so that the cycling stability of the positive electrode active material is improved. The embodiment of the invention also provides a preparation method of the positive electrode active material, and a lithium secondary battery.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium secondary batteries, in particular to a positive electrode active material, a preparation method thereof, and a lithium secondary battery. Background technique [0002] With the development of mobile terminals, especially electric vehicles, the development of lithium-ion batteries with high energy density to meet consumers' demands for long battery life has become a current priority. Based on this, researchers use positive and negative active materials with high specific capacity and increase discharge voltage to achieve the purpose of increasing energy density. [0003] Among them, nickel-cobalt lithium manganate (NCM) ternary cathode material is currently a practical high-capacity cathode material, such as figure 1 Shown is a schematic structural diagram of a conventional nickel-cobalt-manganese-manganese oxide (NCM) ternary positive electrode material. From a macrosco...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M10/0525
CPCH01M4/525H01M4/505H01M4/485H01M10/0525Y02E60/10
Inventor 夏威李阳兴王平华
Owner HUAWEI TECH CO LTD
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