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

A positive electrode material, high nickel ternary material technology, applied in the field of lithium ion battery, ternary positive electrode material and its preparation, can solve the problems of high cost, complex liquid phase method and the like

Pending Publication Date: 2021-05-28
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid-phase process of this scheme is relatively complicated, requiring repeated washing, and the cost is high
[0005] "Enhanced high-temperature cycling of Li 2 O-2B 2 o 3 -coated spine-structured LiNi 0.5 mn 0.1.5 o 4 cathode material for application to lithium-ion batteries》(Chae J S, Yoon S B, Yoon W S, et al.Enhanced high-temperature cycling of Li 2 O–2B 2 o 3 -coated spine-structured LiNi 0.5 mn 1.5 o 4 cathode material for application to lithium-ion batteries[J].Journal of Alloys and Compounds,2014,601:217-222.) reported Li 2 O-2B 2 o 3 coated spinel cathode material, revealing the Li 2 O-2B 2 o 3 It has the function of ion conductor and can improve the electrochemical behavior of positive electrode materials, but the effect of boric acid on reducing residual alkali has not been studied

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

[0057] According to the total mass of boron atom and phosphorus atom and Li 1.01 Ni 0.8 co 0.1 mn 0.1 o 2 According to the mass ratio of 0.001:1, the mixture of orthoboric acid and ammonium dihydrogen phosphate (the molar ratio of B:P is 1.5:1) is put into the high-speed coating machine (referred to as the coating machine), and its volume occupies 10% of the volume of the high-speed mixer. 1 / 3 (that is, the filling amount is 1 / 3), 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 300°C at 5°C / min, and keep it warm for 10h. Introduce oxygen. After the sintering is completed, sieve through a 325-mesh sieving machine to obtain a high-nickel ternary material coated with boron-containing compounds and phosphorus-containing compounds.

[0058] figure 1 The scanning electron microscope (SEM) picture of the boron-containing compound and phosphorus-containing compound composite coating ternary cathode material prepa...

Embodiment 2

[0062] According to the total mass of boron atom and phosphorus atom and Li 1.03 Ni 0.8 co 0.1 mn 0.1 o 2 According to the mass ratio of 0.005:1, the mixture of metaboric acid and ammonium dihydrogen phosphate (the molar ratio of B:P is 2.5:1) is put into the high-speed coating machine (referred to as the coating machine), and its volume occupies 10% of the volume of the high-speed mixer. 1 / 3 (that is, the filling amount is 1 / 3), and mixed at a speed of 50rpm for 2 hours, filled in a sagger, and then placed in a kiln to raise the temperature to 300°C at 3°C / min, keep it warm for 10h, and put it in the kiln Introduce oxygen. After the sintering is completed, sieve through a 325-mesh sieving machine to obtain a high-nickel ternary material compositely coated with a boron-containing compound and a phosphorus-containing compound.

[0063] The test results of the ternary cathode material prepared in this example are shown in Table 1.

[0064] The ternary positive electrode ma...

Embodiment 3

[0066] According to the total mass of boron atom and phosphorus atom and Li 1.05 Ni 0.9 co 0.05 mn 0.05 o 2 According to the mass ratio of 0.003:1, the mixture of tetraboric acid and ammonium monohydrogen phosphate (the molar ratio of B:P is 2.5:1) is put into the high-speed coating machine (referred to as the coating machine), and its volume occupies 10% of the volume of the high-speed mixer. 2 / 3 (that is, the filling amount is 2 / 3), and mixed at a speed of 80rpm for 2 hours, filled in a sagger, and then placed in a kiln to raise the temperature to 400°C at 5°C / min, keep it warm for 8h, and put it in the kiln Introduce oxygen. After the sintering is completed, sieve through a 325-mesh sieving machine to obtain a high-nickel ternary material compositely coated with a boron-containing compound and a phosphorus-containing compound.

[0067] The test results of the ternary cathode material prepared in this example are shown in Table 1.

[0068] The ternary positive electrod...

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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 comprises a core and a composite coating layer coating the core, the core is a high-nickel ternary material, and the composite coating layer comprises a boron-containing compound and a phosphorus-containing compound. The method comprises the following steps: mixing a boron source, a phosphorus source and a high-nickel ternary material, and sintering in an oxidizing atmosphere to obtain the ternary positive electrode material. According to the ternary positive electrode material provided by the invention, through the high-nickel ternary material core and the composite coating layer including the boron-containing compound and the phosphorus-containing compound, the residual alkali amount is low, and the rate discharge capacity and the cycle performance are good.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a positive electrode material, a preparation method thereof, and a battery, 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≤1.05, 0≤x≤0.20, 0≤y≤0.20, M is one or more of Mn, Al, Mg, Ti, Nb) has a high dischar...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 严武渭郑玉杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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