Boron-doped nickel-cobalt-manganese positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-manganese technology, used in battery electrodes, structural parts, electrical components, etc., to improve high-temperature cycle stability, reduce cation mixing, and reduce residual lithium content.

Pending Publication Date: 2022-08-05
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, boron is coated on the surface of the material, which cannot avoid the generation of microcracks and particle breakage during high temperature storage and circulation.

Method used

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  • Boron-doped nickel-cobalt-manganese positive electrode material and preparation method thereof
  • Boron-doped nickel-cobalt-manganese positive electrode material and preparation method thereof
  • Boron-doped nickel-cobalt-manganese positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is ​​Li 1.00 Ni 0.845 Co 0.07 Mn 0.05 Mg 0.01 Sn 0.005 B 0.0 2 O 2.00 , the secondary particle size is D10=9.15 μm, D50=13.04 μm, D90=15.40 μm, and the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. According to the Scherrer formula: D=Kγ / Bcosθ (K is the Scherrer constant, take K=0.89, γ is the X-ray wavelength=0.15418nm, B is the width of the half-peak width of the crystallite size, θ is the Bragg angle), using XRD The boron-doped positive electrode material was analyzed, and the crystallite size D=52.4 nm was calculated using the Scherrer formula according to the analysis result (the peak of the 104 crystal plane).

[0036] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0037] (1) The high nickel cathode material precursor Ni 0.88 Co 0.07 Mn 0...

Embodiment 2

[0041] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is ​​Li 1.00 Ni 0.867 Co 0.05 Mn 0.05 Al 0.01 Sn 0.003 B 0.0 2 O 2.00 , the secondary particle size D10=10.32 μm, D50=13.56 μm, D90=16.41 μm, the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. Its crystallite size is calculated by the Scherrer formula to obtain D=54.6nm.

[0042] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0043] (1) The high nickel cathode material precursor Ni 0.90 Co 0.05 Mn 0.05 (OH) 2 , LiOH·H 2 O, AlB 2 , SnO 2 Put into a high-speed mixer for mixing at a molar ratio of 1:1.03:0.01:0.003, the rotation speed is 1500rpm / min, and after high-speed mixing for 30min, a mixed material is obtained, and the mixed material is placed in a sintering furnace. The temperature was raised to 500°C at a heating rate of 1 / min, kept si...

Embodiment 3

[0047] A boron-doped nickel-cobalt-manganese cathode material, the general formula of the matrix is ​​Li 1.00 Ni 0.848 Co 0.06 Mn 0.06 Mg 0.01 Mo 0.002 B 0.0 2 O 2.00 , the secondary particle size D10=9.92 μm, D50=13.32 μm, D90=15.22 μm, the value of the secondary particle size is obtained by the Malvern 3000 laser particle size analyzer. Its crystallite size is calculated by the Scherrer formula to obtain D=62.6nm.

[0048] The method for preparing boron-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0049] (1) The high nickel cathode material precursor Ni 0.88 Co 0.06 Mn 0.06 (OH) 2 , LiOH·H 2 O, MgB 2 , MoO 3 Put into a high-speed mixer for mixing at a molar ratio of 1:1.06:0.01:0.002, the speed is 1500rpm / min, and after high-speed mixing for 30min, a mixed material is obtained, and the mixed material is placed in a sintering furnace. The temperature was raised to 500°C at a heating rate of 1 / min, kept sintered for...

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Abstract

The invention provides a boron-doped nickel-cobalt-manganese positive electrode material and a preparation method thereof. A matrix general formula of the boron-doped nickel-cobalt-manganese positive electrode material is LiaNibCocMndMeM'fBzO2, M is one or more of Mg, Al, Zr or Ti, M 'Sn, Y, Mo, W, Nb and Ta, and values of a, b, c, d, e, f and z meet the following requirements: a is greater than or equal to 0.95 and less than or equal to 1.2, b is greater than or equal to 0.7 and less than 1, c is greater than 0 and less than or equal to 0.2, d is greater than 0 and less than or equal to 0.2, e is greater than 0 and less than or equal to 0.02, f is greater than 0 and less than or equal to 0.01, and z is greater than 0 and less than or equal to 0.02. The preparation method comprises the following steps: mixing a lithium source, a nickel-cobalt-manganese ternary precursor and compounds of MB2 and M'according to a stoichiometric ratio, sintering at a high temperature, washing with deionized water, drying, and sintering with a coating agent at a low temperature to obtain the boron-doped nickel-cobalt-manganese positive electrode material. The metal element and the boron element are doped in the matrix at the same time, the boron element can enter crystal lattices more easily and can replace transition metal atoms in the crystal lattices, B-O bonds with larger bond energy are formed, the crystal structure is stabilized, the high-temperature storage performance is improved, and gas production of the battery is reduced.

Description

technical field [0001] The invention belongs to a ternary positive electrode material, in particular to a boron-doped nickel-cobalt-manganese positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries can be used in 3C products, power tools, new energy vehicles and other fields. Recently, with the rapid development of new energy vehicles, the demand for lithium-ion batteries has also increased sharply. In order to solve the market demand for high energy density, low cost, and cost-effective batteries, high-nickel ternary cathode materials have been pushed to the forefront of research. [0003] The researchers found that in addition to the commonly used cationic metal modification, the use of boron compounds such as boron oxide or boric acid, or the use of boron-doped compounds as a coating layer can play a role in isolating the electrolyte, which is beneficial to improve the cycle performance of the cathode material. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 佘嘉欣周惠王梦杨鹏段辉谭欣欣
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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