High-capacity long-cycle single-crystal ternary positive electrode material and preparation method thereof

A technology of cathode materials and elements, which is applied in the field of ternary cathode materials and its preparation, can solve problems such as capacity fading and structural instability of cathode materials

Active Publication Date: 2020-07-03
NINGXIA SINOCHEM LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a high-capacity and long-cycle single-crystal ternary anode material, which can exert good cycle performance and safety performance, so as to solve the problem of severe capacity fadin

Method used

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  • High-capacity long-cycle single-crystal ternary positive electrode material and preparation method thereof
  • High-capacity long-cycle single-crystal ternary positive electrode material and preparation method thereof
  • High-capacity long-cycle single-crystal ternary positive electrode material and preparation method thereof

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preparation example Construction

[0050] The present invention also relates to a preparation method of a ternary positive electrode material, comprising:

[0051] (1) Mix the lithium source, the ternary precursor and the additive A in a molar ratio Li: (Ni+Co+Mn):M=(1.05~1.10):1:(0.0001~0.005), and the mixed The material is sintered, wherein the cationic element in the additive A is denoted as M;

[0052] (2) Pulverize the material after sintering in step (1) to obtain a ternary semi-finished product;

[0053] (3) Add additive B and optional surfactant and / or stabilizer to water, stir evenly to obtain coating mixture solution;

[0054] (4) Add the ternary semi-finished product obtained in step (2) to the coating mixture solution obtained in step (3) and stir evenly, the total mass of additive B and optional surfactant and / or stabilizer is three 0.05% to 5% of the mass of the semi-finished product, filtered, dried, and then sintered and crushed to obtain the final product.

[0055] The mixing in step (1) can...

Embodiment 1

[0072] In this embodiment, the ternary positive electrode material is prepared through the following steps:

[0073] (1) Will Li 2 CO 3 、Ni 0.5 co 0.2 mn 0.3 (OH) 2 and Additive A (TiO 2 ) according to the molar ratio Li: (Ni+Co+Mn):Ti=1.05:1:0.0002; mixed for 30min at a rotating speed of 500r / min, and sintered the mixed material, first heating the material to 500 ℃ for 6 hours, and then heated to 950 ℃ for calcination for 12 hours;

[0074] (2) Pulverize the material after sintering in the step (1), control the particle diameter of the sintered material during pulverization: D min 1μm and D 50 is 5 μm, and the ternary semi-finished product is obtained;

[0075] (3) Additive B (TiO 2 ), surfactant polyacrylic acid (PAA) and stabilizer citric acid were added to water, stirred evenly, and the stirring time was 30min to obtain a coating mixture solution; wherein, the quality of water was 3 times that of additive B. The sum of the mass of surfactant and stabilizer added...

Embodiment 2

[0078] In this embodiment, the ternary positive electrode material is prepared through the following steps:

[0079] (1) LiOH·H 2 O, Ni 0.6 co 0.2 mn 0.2 (OH) 2 and Additive A (TiO 2 ) according to the molar ratio of Li: (Ni+Co+Mn):Ti=1.06:1:0.0015, mixed for 30min at a speed of 500r / min, and sintered the mixed material, first heating the material to 550 ℃ for 6 hours, and then heated to 940 ℃ for calcination for 12 hours;

[0080] (2) Pulverize the material after sintering in the step (1), control the particle diameter of the sintered material during pulverization: D min 1μm and D 50 is 5 μm, and the ternary semi-finished product is obtained;

[0081] (3) Additive B (TiO 2), surfactant polyethylene glycol (PEG) and stabilizer ammonium acetate were added to water, stirred evenly, and the stirring time was 30min to obtain a coating mixture solution; wherein, the quality of water was twice that of additive B, and the added The sum of the mass of surfactant and stabiliz...

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Abstract

The invention provides a high-capacity long-cycle single-crystal ternary positive electrode material and a preparation method thereof. The chemical formula of the single crystal ternary positive electrode material is LiNi < x > Co < y > Mn < 1-x-y > MaO < 2 >, wherein x is more than or equal to 0.5 and less than or equal to 1, y is more than 0 and less than or equal to 0.5, x + y is more than 0 and less than 1, a is more than 0 and less than or equal to 0.005, and M is a cation modified element which comprises a Ti element and can also comprise one or more of Al, Mg, Zr, Nb and Y elements. According to the preparation method of the high-capacity long-cycle single-crystal ternary positive electrode material provided by the invention, the material of which the modified elements have concentration gradients which are progressively increased from the core to the surface can be prepared. Under a high charging cut-off voltage, the modified elements are preferentially oxidized compared with transition metal elements, so that the internal structures of the particles are stabilized, the content of the core modified elements is low, the specific capacity of the material is not reduced, meanwhile, the content of the modified elements on the surface of the material is relatively high, the particle surface of the material is relatively stable, and the cycle performance of the material is integrally improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium batteries, and in particular relates to a ternary positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the reduction of state subsidies for the new energy vehicle industry and the growth of downstream new energy vehicle demand for power batteries, the advantages of ternary materials with high energy density have become more and more obvious. Increasing the energy density is mainly to increase the volumetric energy density, and the approach mainly includes the following three aspects: increasing the capacity of the electrode material, increasing the compaction density of the material, and increasing the working voltage of the battery. However, at high voltage, the Li + The influence of the transport path, the different positions of Li in the ternary cathode material particles + The degree of detachment is differen...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘洪金杜柯
Owner NINGXIA SINOCHEM LITHIUM BATTERY MATERIAL CO LTD
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