Polycrystalline ternary positive electrode material as well as preparation method and application thereof

A cathode material and element technology, applied in the field of polycrystalline ternary cathode materials and their preparation, to achieve the effects of improving cycle performance, slowing down cracking, and good structural stability

Pending Publication Date: 2020-09-15
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cracking of the material is due to the anisotropic volume change between the primary particles of the single crystal, and the co

Method used

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  • Polycrystalline ternary positive electrode material as well as preparation method and application thereof
  • Polycrystalline ternary positive electrode material as well as preparation method and application thereof
  • Polycrystalline ternary positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0079] This embodiment provides a method for preparing a polycrystalline ternary cathode material, the method comprising the following steps:

[0080] (1) According to the mass ratio of 0.05:100, the H 3 BO 3 and Ni 0.83 co 0.12 mn 0.05 (OH) 2 Mix and heat up to 150°C at a rate of 1°C / min in nitrogen, and sinter for 48 hours to obtain a polycrystalline ternary cathode material precursor;

[0081] (2) Mix the polycrystalline ternary cathode material precursor obtained in step (1) with lithium hydroxide, raise the temperature to 700° C. at a rate of 1° C. / min, and sinter for 48 hours to obtain the polycrystalline ternary cathode material;

[0082] The molar ratio of the lithium element in the lithium hydroxide to the molar sum of the nickel element, cobalt element and manganese element in the nickel-cobalt-manganese hydroxide is controlled to be 1.01:100.

[0083] In the polycrystalline ternary positive electrode material obtained in this embodiment, the particle size of t...

Embodiment 2

[0085] This embodiment provides a method for preparing a polycrystalline ternary cathode material, the method comprising the following steps:

[0086] (1) According to the mass ratio of 0.3:100, the B 2 o 3 and Ni 0.83 co 0.12 mn 0.05 (OH) 2 Mix and heat up to 380°C at a rate of 5°C / min in argon, and sinter for 30 hours to obtain a polycrystalline ternary cathode material precursor;

[0087] (2) Mix the polycrystalline ternary cathode material precursor obtained in step (1) with lithium hydroxide and alumina, heat up to 800°C at a rate of 5°C / min, and sinter for 26 hours to obtain the polycrystalline ternary cathode material ;

[0088] Controlling the ratio of the mole of lithium element in the lithium hydroxide to the molar sum of nickel element, cobalt element and manganese element in the nickel-cobalt-manganese hydroxide is 1.04:100, and the mass ratio of aluminum element to polycrystalline ternary positive electrode material is 0.25: 100.

[0089]The polycrystallin...

Embodiment 3

[0091] This embodiment provides a method for preparing a polycrystalline ternary cathode material, the method comprising the following steps:

[0092] (1) According to the mass ratio of 0.5:100, the (C 3 h 7 O) 3 B and Ni 0.83 co 0.12 mn 0.05 (OH) 2 Mix and heat up to 500°C at a rate of 10°C / min in argon, and sinter for 12 hours to obtain a polycrystalline ternary cathode material precursor;

[0093] (2) Mix the polycrystalline ternary cathode material precursor obtained in step (1) with lithium nitrate and titanium dioxide, heat up to 900°C at a rate of 10°C / min, and sinter for 4 hours to obtain the polycrystalline ternary cathode material;

[0094] Control the molar ratio of the lithium element in the lithium nitrate to the molar sum of the nickel element, cobalt element and aluminum element in the nickel-cobalt-manganese hydroxide to be 1.08:100, and the mass ratio of the titanium element to the polycrystalline ternary positive electrode material is 0.5:100 .

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Abstract

The invention relates to a polycrystalline ternary positive electrode material as well as a preparation method and application thereof. The polycrystalline ternary positive electrode material comprises secondary particles formed by stacking single crystal primary particles, wherein the single crystal primary particles are in contact with one another to form grain boundaries, and boron elements aredistributed in the grain boundaries. A high-strength B-O-Ni chemical bond is formed between the boron element and the nickel element, so that the acting force between the single crystal primary particles is relatively strong, the contact damage caused by anisotropic volume change between the single crystal primary particles is relieved, and the structural stability is good. The polycrystalline ternary positive electrode material, especially the polycrystalline high-nickel ternary positive electrode material, can slow down the cracking phenomenon in the use process, and has excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a polycrystalline ternary positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and power density, long cycle life and low pollution, and are widely used in electronic equipment and new energy vehicles. As a key component of the lithium-ion battery, the performance of the positive electrode material directly affects the capacity, service life and safety performance of the lithium-ion battery. Therefore, the positive electrode material has received extensive attention. [0003] Compared with other cathode materials, ternary cathode materials have the characteristics of good cycle performance, high capacity, good overcharge resistance, easy synthesis and high cost performance, and have become the preferred cathode materials for lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCH01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 宋鹏元林文佳曾汉民何巍刘金成
Owner EVE ENERGY CO LTD
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