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Preparation method of nickelic ternary lithium battery cathode material with low mixing

A technology for ternary lithium batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high temperature instability, capacity attenuation, and poor practical effects, and achieve the solution of nickel-lithium mixed discharge Severe, inhibit mixed discharge, improve the effect of the first charge and discharge capacity and cycle performance

Inactive Publication Date: 2018-09-07
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the content of nickel ions increases, the disadvantages of nickel-lithium mixed discharge, high-temperature instability and flatulence problems become more prominent.
Among them, the mixed discharge of nickel and lithium has the greatest impact on the battery. The mixed discharge of nickel and lithium caused by the immature manufacturing process leads to a significant attenuation of the first charge and discharge capacity, and at the same time causes structural changes during the lithium ion desorption process.
At present, most of the solutions for nickel-lithium mixed row are doping and coating modification, but the actual effect is not good. Therefore, it has very important practical significance for the improvement and optimization of high-nickel ternary cathode materials for lithium-ion batteries.

Method used

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  • Preparation method of nickelic ternary lithium battery cathode material with low mixing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S01: Nickel chloride, cobalt chloride, and manganese chloride are weighed according to the molar ratio of nickel, cobalt, and manganese 8:1:1, and prepared into salt solution respectively;

[0027] S02: Slowly add nickel chloride solution to the mixed solution prepared by strong oxidizing hydrogen peroxide and sodium hydroxide solution, adjust the pH to 9 to form nickel oxyhydroxide; then add cobalt chloride and manganese chloride, and add precipitate at the same time Sodium hydroxide;

[0028] S03: Heating in a water bath at 40-50°C while using ultrasonic dispersion to react cobalt and manganese metal ions into the nickel oxyhydroxide interlayer by intercalation to obtain a gel-like precipitate;

[0029] S04: Filter the gel obtained in step S03 through a reverse osmosis membrane, the pore size only allows water molecules to pass through, and then mix nickel with lithium chloride and magnesium chloride in a molar ratio of 3:1:1, when the oxygen content is 50% The sinte...

Embodiment 2

[0031] S01: Nickel chloride, cobalt chloride, and manganese chloride are weighed according to the molar ratio of nickel, cobalt, and manganese 8:1:1, and prepared into salt solution respectively;

[0032] S02: Slowly add nickel chloride solution to the mixed solution prepared by strong oxidizing potassium permanganate and sodium hydroxide solution, adjust the pH to 10 to form nickel oxyhydroxide; then add cobalt chloride and manganese chloride, and add Precipitating agent sodium hydroxide;

[0033]S03: Heating in a water bath at 40-50°C while using ultrasonic dispersion to react cobalt and manganese metal ions into the nickel oxyhydroxide interlayer by intercalation to obtain a gel-like precipitate;

[0034] S04: Filter the gel obtained in step S03 through a reverse osmosis membrane, the pore size only allows water molecules to pass through, and then mix nickel with lithium chloride and magnesium chloride in a molar ratio of 3:1:1, when the oxygen content is 65% The sintering...

Embodiment 3

[0036] S01: Nickel chloride, cobalt chloride, and manganese chloride are weighed according to the molar ratio of nickel, cobalt, and manganese 8:1:1, and prepared into salt solution respectively;

[0037] S02: Slowly add nickel chloride solution to the mixed solution prepared by strong oxidizing hydrogen peroxide and sodium hydroxide solution, adjust the pH to 12 to form nickel oxyhydroxide; then add cobalt chloride and manganese chloride, and add precipitate at the same time Sodium hydroxide;

[0038] S03: Heating in a water bath at 40-50°C while using ultrasonic dispersion to react cobalt and manganese metal ions into the nickel oxyhydroxide interlayer by intercalation to obtain a gel-like precipitate;

[0039] S04: Filter the gel obtained in step S03 through a reverse osmosis membrane, the pore size only allows water molecules to pass through, and then mix nickel with lithium chloride and magnesium chloride in a molar ratio of 3:1:1, when the oxygen content is 65% The sint...

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Abstract

The invention belongs to the technical field, and provides a preparation method of a nickelic ternary lithium battery cathode material with low mixing. The preparation method is characterized in thatnickel ions are oxidized into +3 valences to form nickel oxide hydroxide by an alkaline solution with strong oxidizing property, the cobalt and manganese metal ions enter an nickel oxide hydroxide interlayer in an intercalation way through ultrasonic intercalation reaction, and then a +3 valence nickelic ternary material precursor is formed; a small amount of magnesium ions enter the lithium sitesthrough alternative doping, and a small amount of self-reductive bivalent nickel ions is inhibited while the structure is stabilized, so as to inhibit the mixing of nickel ions and lithium ions, andimprove the first-time charge and discharge capacity and cycle property. The preparation method solves the problem of serious mixing of nickel and lithium in the traditional nickelic ternary lithium battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for preparing a low-mixing and high-nickel ternary lithium battery cathode material. Background technique [0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It is different from a rechargeable battery. Lithium-ion batteries are different from lithium-ion polymer batteries. The inventor of the lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements for power supply. Lithium batteries have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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