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Monocrystal-like lithium battery ternary cathode material and preparation method thereof

A positive electrode material, lithium battery technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of new material interface exposure, failure to achieve coating effect, secondary ball rupture, etc., to reduce sintering time, reduce The effect of sintering times and accelerated diffusion

Inactive Publication Date: 2016-11-23
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ternary cathode materials also have some disadvantages, such as high cycle performance of the material and high voltage LiCoO 2 Poor, the capacity decays faster under high voltage, so it is necessary to do doping modification or surface coating modification on the material, and the surface coating modification is one of the effective ways to improve the cycle performance of the material
The morphology of the ternary cathode materials currently on the market is mostly a secondary spherical morphology formed by the agglomeration of many primary particles. The secondary ball is broken, and the new material interface is exposed, so that the expected coating effect cannot be achieved

Method used

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  • Monocrystal-like lithium battery ternary cathode material and preparation method thereof
  • Monocrystal-like lithium battery ternary cathode material and preparation method thereof
  • Monocrystal-like lithium battery ternary cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Nickel sulfate, cobalt sulfate and manganese sulfate are made into mixed solution according to Ni:Co:Mn molar ratio is 0.5:0.2:0.3 and mixes evenly, the total number of moles of Ni, Co, Mn three kinds of transition metal ions is 2mol / L, then Add 4mol / L NaOH solution, transition metal ion solution and 4mol / L ammonia water to the reaction vessel at the same time, control the pH value of the reaction system to 11.5, and the reaction temperature to 60°C, and control the reaction time so that the generated Ni 0.5 co 0.2 mn 0.3 (OH) 2 Particle size D 50 It is 3.5 μm, and the particle size distribution conforms to the normal distribution. Then, the obtained precipitate was filtered, washed, and dried at 120° C. for 12 hours. Lithium carbonate and Ni 0.5 co 0.2 mn 0.3 (OH) 2 According to Li / X=1.12 (X=Ni 0.5 co 0.2 mn 0.3 (OH) 2 ) ratio for mixing, while adding lithium carbonate and Ni 0.5 co 0.2 mn 0.3 (OH) 21% KCl in total mass. After mixing evenly, calcinate ...

Embodiment 2

[0027] Lithium carbonate and Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix according to the ratio of Li / X=1.12, add lithium carbonate and Ni at the same time 0.5 co 0.2 mn 0.3 (OH) 2 3% KCl in total mass. Other steps are the same as in Example 1. The XRD pattern and SEM pattern of the material are as follows figure 1 , figure 2 shown. The results show that the obtained cathode material is a pure phase with good crystallinity. SEM images show that the material has an obvious single-crystal morphology, and the particle size is 2-5 μm. The battery made of this positive electrode material is charged and discharged at a rate of 0.1C (1C capacity 180mAh / g) in the voltage range of 2.9 to 4.45V. The charge and discharge curve is as follows image 3 As shown, the first discharge capacity of the material reaches 182mAh / g.

Embodiment 3

[0029] Lithium nitrate and Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix according to the ratio of Li / X=1.12, add lithium nitrate and Ni at the same time 0.5 co 0.2 mn 0.3 (OH) 2 5% KCl in total mass. Other steps are the same as in Example 1.

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Abstract

The invention relates to a monocrystal-like lithium battery ternary cathode material and a preparation method thereof. The chemical formula of the cathode material is LiNi(1-x-y-z)CoxMnyMzO2, wherein x is larger than 0 and smaller than or equal to 0.65, y is larger than 0 and smaller than or equal to 0.3, z is larger than or equal to 0 and smaller than or equal to 0.05, and M is one or more of Mg, Ca, Ti, Zn, Cr, Fe, Zr, Co, Cu and Ru. The preparation method of the cathode material comprises the following steps of 1 precursor synthesizing; 2 material mixing, wherein a fluxing agent is added in the material mixing process; 3 sintering and the like. According to the method, the melting point of the material is lowered by adding the fluxing agent, therefore, precursors and lithium salts are in a molten environment, dispersion of metal ions is accelerated, and crystal grains start to grow and development at low temperature, break limitation of precursor aggregates after growing to a certain degree to be dispersed into monocrystal grains and finally grow into the cathode material with the monocrystal morphology; the sintering frequency and the sintering time in the existing monocrystal material synthesizing process are decreased, and then the production cost is reduced.

Description

technical field [0001] The invention relates to a ternary cathode material for a single-crystal lithium battery and a preparation method thereof, belonging to the field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, and low self-discharge rate, and their application range is constantly expanding. Lithium-ion battery cathode material is one of the core materials of lithium-ion batteries, which accounts for about 30% of the total battery cost and directly affects the cost of the battery. In addition, the development of positive electrode materials lags behind that of negative electrode materials, and positive electrode materials become the key materials that limit battery capacity. Therefore, safe, inexpensive, high-performance and high-capacity positive electrode materials have always been one of the priorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 吴保明田新勇徐云军尹正中程迪李小红
Owner HENAN KELONG NEW ENERGY CO LTD
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