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Quaternary positive electrode material and preparation method and application thereof

A technology of positive electrode materials and positive electrode sheets, which is applied in the field of quaternary positive electrode materials and its preparation, can solve the problems of unspecified electrochemical properties of positive electrode materials, poor cycle performance of high-nickel quaternary positive electrode materials, and high requirements for hydrothermal reaction conditions, etc. problems, to achieve the effect of excellent capacity, short cycle time and easy synthesis

Active Publication Date: 2021-11-02
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not clearly indicate the electrochemical performance of the positive electrode material before coating, and the improvement of the material by adding aluminum cannot be reflected after coating and modification with graphene, and the hydrothermal reaction conditions are relatively high, difficult to control, and the synthesis process is relatively complicated.
[0006] The above method has the problem of complex preparation process or poor cycle performance of the high-nickel quaternary positive electrode material, so it is necessary to develop a high-nickel quaternary positive electrode material with simple preparation method and good cycle performance

Method used

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  • Quaternary positive electrode material and preparation method and application thereof
  • Quaternary positive electrode material and preparation method and application thereof
  • Quaternary positive electrode material and preparation method and application thereof

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Embodiment 1

[0041] This embodiment provides a quaternary positive electrode material, and the preparation method of the quaternary positive electrode material is as follows:

[0042] (1) Mix nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=90:7:2:1) and LiOH according to the transition metal: Li molar ratio of 1:1.025, and then add nickel 0.3% Nb by mass of cobalt manganese aluminum hydroxide 2 o 5 and 0.1% B by mass of nickel cobalt manganese aluminum hydroxide 2 o 3 , dry mixed in a mixer, calcined the dry mixed material in an ordinary box furnace at 700°C in an oxygen atmosphere for 8 hours, cooled, crushed and sieved to obtain a boron / niobium-doped quaternary positive electrode material;

[0043](2) Mix the obtained boron / niobium-doped quaternary positive electrode material with distilled water at a ratio of 1:1, stir at 300rpm for 10min, place it in a vacuum oven at 150°C for 10h, take it out after drying, and add the dried boron / niobium 0.1% boric acid of the...

Embodiment 2

[0046] This embodiment provides a quaternary positive electrode material, and the preparation method of the quaternary positive electrode material is as follows:

[0047] (1) Mix nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=95:2:2:1) and LiOH according to the transition metal: Li molar ratio of 1:1.15, and then add nickel 0.4% Nb by mass of cobalt manganese aluminum hydroxide 2 o 5 and 0.2% B by mass of nickel cobalt manganese aluminum hydroxide 2 o 3 , dry-mixed in a mixer, calcined the dry-mixed material in an ordinary box furnace at 750°C in an oxygen atmosphere for 9 hours, cooled, pulverized and sieved to obtain a boron / niobium-doped quaternary positive electrode material;

[0048] (2) Mix the obtained boron / niobium-doped quaternary cathode material with distilled water at a ratio of 1:1, stir at 350rpm for 12min, place it in a vacuum oven at 180°C for 18h, take it out after drying, and add the dried boron / niobium 0.2% boric acid of the mass of...

Embodiment 3

[0050] The only difference between this embodiment and embodiment 1 is that the Nb described in step (1) 2 o 5 The doping amount is 0.2%, and other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides a quaternary positive electrode material and a preparation method and an application thereof, and the preparation method comprises the following steps: (1) mixing a quaternary precursor, a niobium source, a boron source and a lithium source, and carrying out primary calcination to obtain a boron / niobium doped quaternary positive electrode material; and (2) washing the boron / niobium doped quaternary positive electrode material obtained in the step (1) with water, drying, mixing with boric acid, and carrying out secondary calcination to obtain the quaternary positive electrode material, wherein the chemical formula of the quaternary precursor in the step (1) is LiNixCoyMnzAl(1-x-y-z)O2(x is greater than or equal to 0.9 and less than 1, y is greater than 0 and less than 0.07, and z is greater than 0 and less than 0.03). According to the preparation method disclosed by the invention, the lattice structure is stabilized and the generation of microcracks is limited by adjusting the textured microstructure of the ultrahigh nickel positive electrode material through a niobium / boron co-doping mechanism, so that the cycle life of the ultrahigh nickel positive electrode material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a quaternary positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the most widely used electrochemical power source at present. The most representative of this kind of battery is the lithium secondary battery that generates electric energy due to the change of chemical potential of lithium ions in the positive and negative electrodes when intercalation and deintercalation. (LIBs). Cathode materials have a direct and dominant effect on the performance of LIBs, so many researchers are committed to realizing a cathode material with large capacity, fast charge / discharge speed, and long cycle life that can perform reversible intercalation and deintercalation of lithium ions. Currently, ultra-high nickel materials are considered to be the most promising candidates because they can incr...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01B35/10C01B35/00H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44C01B35/00C01B35/1045C01B35/1027H01M4/505H01M4/525H01M4/485H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王壮张树涛白艳马加力王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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