High-voltage-resistant low-cobalt ternary positive electrode material and preparation method thereof

A cathode material, high-voltage-resistant technology, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of no price advantage and high production cost, and achieve the effect of reducing cost, low internal resistance, and small internal resistance

Inactive Publication Date: 2021-06-18
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently proportional ternary materials, such as NMC532, NMC622, etc. have relatively high production costs, and there is no advantage in price, which has led many battery companies to urgently look for a ternary material with low cost and good performance.

Method used

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  • High-voltage-resistant low-cobalt ternary positive electrode material and preparation method thereof
  • High-voltage-resistant low-cobalt ternary positive electrode material and preparation method thereof
  • High-voltage-resistant low-cobalt ternary positive electrode material and preparation method thereof

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preparation example Construction

[0042] The second aspect of the present invention is to provide a method for preparing the high-pressure resistant low-cobalt ternary positive electrode material described in the first aspect of the present invention, the method comprising the following steps:

[0043] Step 1, pretreating the precursor containing nickel, cobalt and manganese.

[0044] Among the present invention, described precursor containing nickel, cobalt, manganese is preferably the precursor of low cobalt content, more preferably has empirical formula (Ni 0.5 co 0.1 mn 0.4 )(OH) 2 precursors.

[0045] The invention adopts a one-time solid-phase sintering process to prepare a high-pressure-resistant and low-cobalt ternary positive electrode material. The preparation method has simple process, low cost, convenient operation, and is easy to realize large-scale industrial production.

[0046]In the present invention, the pretreatment of the precursor includes crushing and sieving. The precursor is pulver...

Embodiment 1

[0090] First weigh (Ni 0.5 co 0.1 mn 0.4 )(OH) 2 Precursor body 100g, take Lithium Retard 42.30g with excess 6% Li molar weight, then take by weighing neodymium oxide (Nd 2 o 3 ) additive 0.06g, tungsten oxide (WO 3 ) additive 0.038g;

[0091] Add the precursor, lithium carbonate, and neodymium oxide additives to a small high-mixer for mixing to ensure uniform mixing, and no white spots or lines are found in the mixed material;

[0092] The mixture is synthesized once in a muffle furnace, and the synthesis temperature is 500°C / 5h+850°C / 12h+930°C / 12h;

[0093] After the muffle furnace cools down naturally, the material is taken out and passed through a 300 molybdenum sieve to obtain the final product.

[0094] Scanning electron microscope test is carried out to the final product that makes, and the obtained result is as follows: figure 1 shown, from figure 1 It can be seen from the figure that the prepared particles are spherical, and the boundaries of each particle ar...

Embodiment 2

[0096] First weigh (Ni 0.5 co 0.1 mn 0.4 )(OH) 2 Precursor body 100g, take Lithium Retard 42.30g with excess 6% Li molar weight, then take by weighing neodymium oxide (Nd 2 o 3 ) additive 0.06g;

[0097] Add the precursor, lithium carbonate, and neodymium oxide additives to a small high-mixer for mixing to ensure uniform mixing, and no white spots or lines are found in the mixed material;

[0098] The mixture is synthesized once in a muffle furnace, and the synthesis temperature refers to 500°C / 5h+850°C / 12h+930°C / 12h;

[0099] After the muffle furnace is naturally cooled, the material is taken out and passed through a 300 molybdenum sieve to obtain the final product for testing and analysis;

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Abstract

The invention discloses a high-voltage-resistant low-cobalt ternary positive electrode material which is prepared from a precursor containing nickel, cobalt and manganese, a lithium source and a small amount of an additive through the following steps: pretreating the precursor, then mixing the precursor, the lithium source and the additive, sintering, and carrying out post-processing to obtain the high-voltage-resistant low-cobalt ternary positive electrode material. The high-voltage-resistant low-cobalt ternary positive electrode material provided by the invention is relatively high in morphology regularity and uniform in particle size, and a lithium ion battery prepared from the positive electrode material still has relatively low internal resistance and excellent high-temperature cycle performance under high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to an improved method for a nickel-cobalt lithium manganese oxide cathode material. Background technique [0002] Ternary 5 series materials are currently widely used in 3C digital and power fields. However, with the implementation of the national refund policy, many battery companies have taken "cost reduction" as the theme in recent years. The future development direction of ternary materials become difficult. Currently proportional ternary materials, such as NMC532 and NMC622, have relatively high production costs and no price advantage, which has led many battery companies to urgently look for a ternary material with low cost and good performance. Furthermore, the 3C digital high-voltage field has also gradually moved closer to ternary materials from the previous use of pure lithium cobalt oxide materials. 5-series high-voltage materials are their first ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 高智黄佳佳沙金周玉林吴垚震金铭凌仕刚朱卫泉
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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