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Ternary positive electrode material, preparation method thereof and lithium ion battery

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of rate performance and cycle performance that need to be improved

Active Publication Date: 2020-05-26
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the free lithium and pH value on the surface of high-nickel ternary materials to a certain extent, its rate performance and cycle performance still need to be improved.

Method used

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  • Ternary positive electrode material, preparation method thereof and lithium ion battery
  • Ternary positive electrode material, preparation method thereof and lithium ion battery
  • Ternary positive electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In this embodiment, the ternary positive electrode material is prepared according to the following method:

[0072] (1) Put the mixture of orthoboric acid and cobalt nitrate into the high-speed mixer (referred to as the high-speed mixer) at a molar ratio of B:Co of 1:1, and its volume occupies 1 / 5 of the volume of the high-mixer (that is, the filling capacity is 1 / 5), and mixed at a speed of 100rpm for 0.5h, filled in a sagger, and then placed in a kiln to raise the temperature to 400°C at 5°C / min, keep warm for 5h, and feed 1L / h nitrogen into the kiln. After the sintering is completed, crush and sieve through a 325-mesh sieving machine to obtain Co 2 B 2 o 5 .

[0073] (2) will Co 2 B 2 o 5 With the high nickel ternary material Li with an average particle size of 3 μm 1.01 Ni 0.8 co 0.1 mn 0.1 o 2 According to the mass ratio of 0.001:1 and the filling amount of 1 / 5, mix it on a high-speed mixer at a speed of 50rpm for 1 hour, fill it in a sagger, and then p...

Embodiment 2

[0078] In this embodiment, the ternary positive electrode material is prepared according to the following method:

[0079] (1) The mixture of boron oxide and cobalt hydroxide is mixed in a high-speed mixer at a speed of 50 rpm for 2 hours at a molar ratio of B:Co of 1:1 and a filling amount of 3 / 4, then filled in a sagger, and placed Raise the temperature to 600°C at a rate of 5°C / min in the kiln, keep the temperature for 3h, and pass 5L / h argon into the kiln. After the sintering is completed, crush and sieve through a 325-mesh sieving machine to obtain Co 2 B 2 o 5 .

[0080] (2) will Co 2 B 2 o 5 With the high-nickel ternary material Li with an average particle size of 15 μm 0.95 Ni 0.6 co 0.2 mn 0.2 o 2 According to the mass ratio of 0.005:1 and the filling amount of 3 / 4, mix it on a high-speed mixer at a speed of 100rpm for 1 hour, fill it in a sagger, and then place it in a kiln to raise the temperature to 500°C at 5°C / min and keep it warm for 10h , Air is int...

Embodiment 3

[0084] In this embodiment, the ternary positive electrode material is prepared according to the following method:

[0085] (1) The mixture of tetraboric acid and cobalt carbonate is mixed in a high-speed mixer at a speed of 60rpm for 1h at a molar ratio of B:Co of 1:1 and a filling amount of 3 / 5, then filled in a sagger, and placed in a The temperature in the kiln is raised to 500°C at 3°C / min, and the temperature is kept for 4h, and 10L / h of carbon dioxide is introduced into the kiln. After the sintering is completed, crush and sieve through a 325-mesh sieving machine to obtain Co 2 B 2 o 5 .

[0086] (2) will Co 2 B 2 o 5 With the high-nickel ternary material Li with an average particle size of 10 μm 1.0 Ni 0.65 co 0.15 mn 0.20 o 2 According to the mass ratio of 0.003:1 and the filling amount of 3 / 4, mix it on a high-speed mixer at a speed of 70rpm for 1.5h, fill it in a sagger, and then place it in a kiln to raise the temperature to 300°C at 3°C / min and keep it w...

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Abstract

The invention provides a ternary positive electrode material, a preparation method thereof and a lithium ion battery. The ternary positive electrode material is mainly composed of a high-nickel ternary material core and a cobalt borate coating layer. The preparation method comprises the steps of 1) mixing a boron source and a cobalt source, and sintering in a protective atmosphere to obtain cobaltborate; and 2) mixing cobalt borate with the high-nickel ternary material, and heating in an oxidizing atmosphere to obtain the ternary positive electrode material. According to the ternary positiveelectrode material provided by the invention, the high-nickel ternary material core, the cobalt borate coating layer and the lithium cobalt borate positioned between the high-nickel ternary material core and the cobalt borate coating layer are matched with one another, so that the ternary positive electrode material is low in residual alkali content and good in rate discharge capacity and cycle performance. The preparation method provided by the invention is short in process, simple to operate and easy for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a ternary positive electrode material, in particular to a ternary positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in other applications such as consumer electronics, energy storage and electric vehicles, especially the current increase in the mileage of electric vehicles has led to an increasing demand for high energy density, compared with the higher capacity of the graphite anode system (≥350mAh / g), the capacity of cathode materials restricts the energy density of lithium-ion batteries, so it is necessary to develop cathode materials with higher energy densities. High nickel ternary cathode material Li z Ni 1-x-y co x m y o 2 (0.95≤z≤1.10, 0≤x≤0.20, 0≤y≤0.20, M is one or more of Mn, Al, Mg, Ti, Nb) has a high discharge capacity (≥180mAh / g) And voltage p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 严武渭温伟城杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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