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Phosphorus-doped core-shell ternary positive electrode material, preparation method thereof and lithium ion battery

A cathode material, phosphorus doping technology, applied in the direction of positive electrodes, secondary batteries, battery electrodes, etc., can solve the problems of material rate performance decline, failure to form, uneven shell distribution, etc., to achieve good rate performance and safety performance, Strong structural stability, good cycle performance and rate performance

Active Publication Date: 2020-01-21
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the formation of a gradient core-shell structure can effectively inhibit the side reaction of the core structure in contact with the electrolyte, but the preparation of the concentration gradient core-shell structure by the traditional co-precipitation method will have the disadvantage of uneven shell distribution, while the common dry-wet method includes However, it is impossible to form a core-shell structure with a concentration gradient; in addition, there are also problems such as the electrochemical activity of the shell material is not strong, which makes the rate performance of the material decrease.

Method used

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  • Phosphorus-doped core-shell ternary positive electrode material, preparation method thereof and lithium ion battery
  • Phosphorus-doped core-shell ternary positive electrode material, preparation method thereof and lithium ion battery
  • Phosphorus-doped core-shell ternary positive electrode material, preparation method thereof and lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Weigh 1.19g of nickel nitrate, 0.63g of cobalt nitrate hexahydrate and 0.39g of manganese nitrate (the molar ratio of nickel:cobalt:manganese is about 6:2:2), 0.11g of sodium hypophosphite, 0.65g of urea, and 0.42g of sodium citrate g. Dissolved in 80 mL deionized water, stirred for 15 min, then added 100 g of ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Stir well to obtain mixed solution A. Pour the mixed solution A into the reaction kettle, and conduct hydrothermal heating at 200°C for 8 hours to obtain a phosphorus-doped core-shell ternary precursor, in which the shell is phosphorus-doped Ni 0.6 co 0.2 mn 0.2 (OH) 2 .

[0075] The core-shell structure obtained in the above steps was vacuum-dried, then mixed with 50.56 g of lithium hydroxide by ball milling, and sintered at 750° C. for 10 h in an oxygen atmosphere to obtain a phosphorus-doped core-shell ternary positive electrode material.

Embodiment 2

[0086] Weigh 7.02g of nickel nitrate, 2.40g of cobalt nitrate hexahydrate and 3.09g of aluminum nitrate nonahydrate (the molar ratio of nickel:cobalt:aluminum is about 7:1.5:1.5), 0.26g of sodium pyrophosphate decahydrate, 3.30g of urea, hard Sodium fatty acid 0.17g. Dissolved in 80 mL deionized water, stirred for 15 min, then added 100 g of ternary precursor Ni 0.9 co 0.05 Al 0.05 (OH) 2 Stir well to obtain mixed solution A. Pour the mixed solution A into the reaction kettle. A phosphorus-doped core-shell ternary precursor was obtained by hydrothermal heating at a temperature of 180 °C for 12 hours, where the shell was phosphorus-doped Ni 0.75 co 0.15 Al 0.15 (OH) 2 .

[0087] The phosphorus-doped core-shell ternary precursor obtained in the above steps was vacuum-dried and mixed with 53.56 g of lithium hydroxide ball mill, and sintered at 700° C. for 12 hours in an oxygen atmosphere to obtain a phosphorus-doped core-shell ternary positive electrode material.

Embodiment 3

[0098] Weigh 4.73 g of nickel nitrate, 0.940 g of cobalt nitrate hexahydrate and 0.78 g of titanium sulfate (the molar ratio of nickel: cobalt: manganese is about 0.8:0.1:0.1), 1.20 g of sodium phosphite, 2.42 g of ammonia water, dodecylbenzene Sodium sulfonate 1.13 g. Dissolved in 80 mL deionized water, stirred for 15 min, then added 100 g of ternary precursor Ni 0.95 co 0.03 mn 0.02 (OH) 2 Stir well to obtain mixed solution A. Pour the mixed solution A into the reaction kettle. The phosphorus-doped core-shell ternary precursor was obtained by hydrothermal heating at 150°C for 15 hours, where the shell was phosphorus-doped Ni 0.8 co 0.1 Ti 0.1 (OH) 2.2 .

[0099] The phosphorus-doped core-shell ternary precursor obtained in the above steps was vacuum-dried and mixed with 47.34 g of lithium hydroxide ball milled, and sintered at 680°C for 16 hours in an oxygen atmosphere to obtain a phosphorus-doped core-shell ternary positive electrode material.

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Abstract

The invention provides a phosphorus-doped core-shell ternary positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps:adding a nickel source, a cobalt source, a phosphorus source, an alkali source, an R source and a precursor Ni<1-x-y>CoxZy(OH)2 into water to obtain a mixed solution, and performing hydrothermal reaction to obtain a phosphorus-doped core-shell ternary positive electrode precursor; and mixing the phosphorus-doped core-shell ternary positive electrode precursor with a lithium source, and sintering the mixture in an oxygen atmosphere to obtain the phosphorus-doped core-shell ternary positive electrode material. The phosphorus-doped core-shell ternary positive electrode material is prepared by using the preparation method. The lithium ion battery is prepared from the phosphorus-doped core-shell ternary positive electrode material. The phosphorus-doped core-shell ternary positive electrode material provided by the invention is stable in structure and good in cycle performance and rate capability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a phosphorus-doped core-shell ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, household appliances, and power tools, especially the ternary material LiNi 1-x-y co x Z y o 2 (Z=Mn or Al) as the positive electrode of lithium-ion batteries in the field of new energy vehicles, and the application share of digital electronics is increasing day by day. People have higher and higher requirements on the energy density and service life of lithium-ion batteries. Nowadays, it has become a general trend to increase the energy density of lithium ions by increasing the nickel content in the ternary cathode material. However, with the increase in the nickel content of the ternary cathode material, the material is prone to side reactions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/61C01P2004/84H01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张琼邓多罗桂赵德唐泽勋商士波
Owner SOUNDON NEW ENERGY TECH CO LTD
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