Single-crystal nickel cobalt lithium manganate positive electrode material and preparation method and application thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., and can solve problems such as damage, poor cycle life, and increased battery polarization and internal resistance

Active Publication Date: 2021-11-09
JIANGSU XIANGYING NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, with the continuous improvement of lithium-ion battery capacity requirements for pure electric vehicles, hybrid vehicles and portable energy storage devices, people expect to develop lithium-ion batteries with higher energy density and power density to achieve long-term battery life and energy storage. Increasing the working voltage of the battery is one of the effective ways to increase the energy density of the lithium-ion battery. However, increasing the working voltage will cause a series of problems such as the degradation of the cycle performance of the lithium-ion battery, such as the increase of side reactions at the electrode / electrolyte interface and the increase of oxygen The precipitation increases the polarization and internal resistance of the battery, leading to the problem of poor cycle life
In order to improve the thermal stability and cycle performance of ternary materials under high voltage, common methods include coating and modifying ternary cathode materials. However, although the current ternary materials have been coated and modified, they still cannot perform well Coated on the surface of the positive electrode material, and cannot effectively reduce the reaction of the electrolyte / material interface under high voltage, the cycle stability is poor, and it is difficult to meet the actual needs
At the same time, the traditional secondary spherical particle structure is poor in firmness, and its skeleton structure is easily damaged under higher voltage, which leads to aggravated electrode / solution interface reaction, resulting in a decrease in battery performance.

Method used

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  • Single-crystal nickel cobalt lithium manganate positive electrode material and preparation method and application thereof
  • Single-crystal nickel cobalt lithium manganate positive electrode material and preparation method and application thereof
  • Single-crystal nickel cobalt lithium manganate positive electrode material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0038] This example provides a method for preparing a single crystal nickel cobalt lithium manganese oxide positive electrode material and the prepared single crystal nickel cobalt lithium manganese oxide positive electrode material.

[0039] The preparation method includes: (1) according to the mass ratio of alumina and aluminum metaphosphate of 1:2, adding the solid mixture to ultrapure water to form slurry A, so that the solid matter accounts for 30% of the slurry , the slurry was stirred at 600rpm for 2h. Then the obtained slurry A was mixed with single crystal Ni 0.5 co 0.2 mn 0.3 (OH) 2 The precursor was added into the grinder at a mass ratio of 5:6, and the dispersed slurry was ground by grinding spheres with a particle size of 0.1 mm in the sand mill at a speed of 3000 rpm. Stir the slurry with a dispersing disc at 600 rpm for 2 h. The dispersed slurry was pumped into a spray dryer, and spray-dried at 300 rpm. The obtained spray-dried material was subjected to je...

Embodiment 2

[0044] This example provides a method for preparing a single crystal nickel cobalt lithium manganese oxide positive electrode material and the prepared single crystal nickel cobalt lithium manganese oxide positive electrode material.

[0045] The preparation method includes: (1) The method of step (1) in Example 1 is the same to obtain the composite material B.

[0046] (2) The same method as in step (2) of Example 1 to obtain shell material C.

[0047] (3) Prepare the nuclear layer: take the lithium source and the ternary single crystal material precursor Ni according to the molar ratio of Li:ternary material precursor=1.05:1 0.7 co 0.1 mn 0.2 (OH) 2 , after mixing the above materials in a 600r / min high-speed mixer for 45 minutes, put them into the atmosphere furnace, sintering temperature 930±10°C, sintering time 12h, sintering atmosphere is oxygen atmosphere, and the core layer material E is obtained.

[0048] (4) The shell material C is used as the coating layer, and t...

Embodiment 3

[0050] This example provides a method for preparing a single crystal nickel cobalt lithium manganese oxide positive electrode material and the prepared single crystal nickel cobalt lithium manganese oxide positive electrode material.

[0051] The preparation method includes: (1) The method of step (1) in Example 1 is the same to obtain the composite material B.

[0052] (2) The same method as in step (2) of Example 1 to obtain shell material C.

[0053] (3) Prepare the nuclear layer: take the lithium source and the ternary single crystal material precursor Ni according to the molar ratio of Li:ternary material precursor=1.05:1 0.83 co 0.11 mn 0.06 (OH) 2 , after mixing the above materials in a 600r / min high-speed mixer for 45 minutes, put them into the atmosphere furnace, sintering temperature 890±10°C, sintering time 12h, sintering atmosphere is oxygen atmosphere, and the core layer material F is obtained.

[0054] (4) The shell layer material C is used as the cladding la...

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Abstract

The invention discloses a single-crystal nickel cobalt lithium manganate positive electrode material and a preparation method and application thereof. The positive electrode material is of a core-shell structure, and the material of a core layer is a high-nickel nickel cobalt manganese ternary single-crystal positive electrode material; the material of the shell layer comprises Lir(NisCotMn1-s-t)O2 (II), metal oxide and metal metaphosphate, in the formula (II), 0.9< / =r< / =1.05, 0.3< / =s< / =0.5, 0<t<0.4, and 1-s-t>0; in terms of mass percentage, in the material of the shell layer, the formula (II) accounts for more than 50% by mass, and the feeding mass ratio of the metal oxide to the metal metaphosphate is 1: (0.1-10). The preparation method comprises the following steps of mixing, dispersing and grinding a precursor of a formula (II), a metal oxide and metal metaphosphate, mixing and sintering with a lithium source to obtain a shell layer material, mixing with a core layer material, and sintering to obtain the positive electrode material. The positive electrode material can be suitable for working under 4.5 V high voltage and has ideal cycle stability.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrode materials, in particular to a positive electrode material, in particular to a single crystal nickel-cobalt lithium manganese oxide positive electrode material and a preparation method and application thereof. Background technique [0002] Nowadays, with the continuous improvement of lithium-ion battery capacity requirements for pure electric vehicles, hybrid vehicles and portable energy storage devices, people expect to develop lithium-ion batteries with higher energy density and power density to achieve long-term battery life and energy storage. Increasing the working voltage of the battery is one of the effective ways to increase the energy density of the lithium-ion battery. However, increasing the working voltage will cause a series of problems such as the degradation of the cycle performance of the lithium-ion battery, such as the increase of side reactions at the electrode / electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/525H01M4/505H01M4/5825H01M10/0525H01M2004/028H01M4/366H01M4/483Y02E60/10
Inventor 钟欢龚黎明夏晟任浩华
Owner JIANGSU XIANGYING NEW ENERGY TECH CO LTD
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