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Nickel base trinary positive electrode material and preparation method thereof

A kind of positive electrode material, nickel-based technology, applied in the field of nickel-based ternary positive electrode materials and its preparation, can solve the problems of easy to be corroded cycle life, limit large-scale commercial application, high residual alkali content on the surface, etc. Sensitive, improve electrochemical performance, reduce the effect of residual lithium content

Active Publication Date: 2016-05-11
四川浩普瑞新能源材料股份有限公司
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Problems solved by technology

[0004] However, nickel-based ternary cathode materials also have defects. They are easily corroded during the cycle, which reduces the cycle life and affects the electrochemical performance such as cycle performance and rate performance, thus limiting the large-scale commercial application of this type of material. and due to the high nickel content of the nickel-based material, when the material is exposed to the air, it is very easy to have a side reaction with the moisture in the air, resulting in a high residual alkali content on the surface, and its main component is Li 2 CO 3 , in addition there is a part based on Li 2 SO 4 LiOH exists in the form of nickel-based ternary cathode materials, so the moisture content in the environment is strictly controlled during the production and packaging process, which seriously affects the processing performance of the material, thus becoming a shackle for the further development of nickel-based ternary cathode materials

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  • Nickel base trinary positive electrode material and preparation method thereof
  • Nickel base trinary positive electrode material and preparation method thereof
  • Nickel base trinary positive electrode material and preparation method thereof

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[0045] The invention provides a method for preparing a nickel-based ternary positive electrode material, comprising the following steps:

[0046] 1) After mixing and calcining the nickel-based material precursor and lithium salt, the nickel-based material is obtained;

[0047] The chemical formula of the nickel-based material is as shown in formula (I),

[0048] LiNi 1-x-y co x mn y o 2 (I); Wherein, (1-x-y)≥0.5, x>0, y>0;

[0049] 2) Reacting the nickel-based material obtained in the above steps with a coupling agent in an organic solvent, and then roasting to obtain a nickel-based ternary positive electrode material.

[0050] The preferred principles of the present invention, such as the selection and proportion of the raw materials, are consistent with those of the aforementioned nickel-based ternary cathode materials, and will not be repeated here.

[0051] In the invention, firstly, the nickel-based material precursor is mixed and calcined with lithium salt to obtai...

Embodiment 1

[0070] Nickel-based Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide were uniformly mixed according to the molar ratio of Li:(Ni+Co+Mn)=1.03:1, then calcined at 800°C for 10 hours at a high temperature, cooled, pulverized, and sieved to obtain an uncoated nickel-based positive electrode material, This is the uncoated material.

[0071] Add the uncoated nickel-based positive electrode material obtained above into absolute ethanol, the mass ratio of nickel-based ternary positive electrode material to absolute ethanol is 1:2. Add the titanate coupling agent at a mass ratio of 0.01:1, control the reaction temperature of the system at 55°C, and the stirring speed at 400 rpm. After reacting for 1 hour, filter while it is hot, and roast at a constant temperature of 300°C 2h, the nickel-based ternary positive electrode material coated with the decomposed oxide of the titanate coupling agent was prepared, which was the coated material.

[0072] see figure 1 , figu...

Embodiment 2

[0080] Nickel-based Ni 0.5 co 0.2 mn 0.3 (OH) 2 The precursor and lithium carbonate were uniformly mixed according to the molar ratio of Li:(Ni+Co+Mn)=1.04:1, then calcined at 900°C for 12 hours at high temperature, cooled, pulverized, and sieved to obtain nickel-based materials.

[0081] Add the nickel-based material obtained above into isopropanol, the mass ratio of the nickel-based ternary positive electrode material to isopropanol is 1:3, after stirring at a high speed and dispersing, the mass ratio with the nickel-based ternary positive electrode material is Aluminate coupling agent was added in an amount of 0.02:1, the reaction temperature of the control system was 60°C, and the stirring speed was 500 rpm. After reacting for 1.5 hours, it was filtered while it was hot, and roasted at a constant temperature of 400°C for 3 hours. Aluminate coupling agent decomposes oxide-coated nickel-based ternary cathode materials.

[0082] The coated nickel-based ternary positive el...

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Abstract

The invention provides a nickel base trinary positive electrode material, which is obtained through compounding coupling agents onto the surface of nickel base materials and then performing heat treatment. The hydrophilic surface property of the nickel base trinary positive electrode material is improved by a compound modification method; the problem that the nickel base trinary positive electrode material is sensitive to the moisture in the environment is effectively solved; the residue lithium content on the surface of the particles is reduced; in addition, the discharging specific capacity loss of the nickel base trinary positive electrode material cannot be caused; the dissolution of transition metal ions on the surfaces of the particles in the long-time circulation process can be inhibited; the corrosion of HF generated in the charging and discharging process on the surface of the materials can be reduced; the electrochemical performance of the materials is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a nickel-based ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main selection object of the power supply. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. Cathode material is one of the key materials of lithium-ion batteries, which determines the performance of lithium-ion batteries. At present, the biggest bottleneck that limits the energy density, power density, cycle life and safety of lithium-ion power batteries lies in the cathode material technolo...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 贺天江王飞唐世国周少江石迪辉周宏祥
Owner 四川浩普瑞新能源材料股份有限公司
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