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Nickel-cobalt-manganese composite material prepared from rare earth doped hydroxide precursor, preparation method and application of nickel-cobalt-manganese composite material in battery

A hydroxide and rare earth doping technology, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of restricting the practical application of lithium ion batteries, poor safety of lithium primary batteries, and high production requirements, and achieve improved Capacity and cycling stability, improved electrochemical performance, low cost effect

Pending Publication Date: 2021-06-01
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are still some problems that need to be solved in lithium-ion batteries: for example, (1) lithium primary batteries have poor safety and there is a danger of explosion; (3) All lithium-ion batteries need to protect the circuit to prevent the battery from being overcharged and over-discharged; (4) The production requirements are high and the cost is high; (5) The actual specific capacity of commercial lithium-ion batteries is less than 200mAh / g, The specific energy is less than 300Wh / kg, which seriously restricts the development of electric vehicles, electronic products, smart grid and other industries
The above-mentioned problems limit the practical application of lithium-ion batteries

Method used

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  • Nickel-cobalt-manganese composite material prepared from rare earth doped hydroxide precursor, preparation method and application of nickel-cobalt-manganese composite material in battery
  • Nickel-cobalt-manganese composite material prepared from rare earth doped hydroxide precursor, preparation method and application of nickel-cobalt-manganese composite material in battery
  • Nickel-cobalt-manganese composite material prepared from rare earth doped hydroxide precursor, preparation method and application of nickel-cobalt-manganese composite material in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]A method for preparing a nickel-cobalt-manganese composite material from a rare earth-doped hydroxide precursor, comprising the following steps:

[0047] 1) Weigh 2 / 3mol of NiSO respectively 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O, prepared into 1000mL of NiSO with a total concentration of 2moL / L 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O mixed aqueous solution A;

[0048] 2) Add 0.67mmoL of one of yttrium sulfate octahydrate or scandium nitrate hydrate to solution A and stir to dissolve to form solution B;

[0049] 3) Prepare 3.6moL / L of NH 3 ·H 2 O solution (ammonia), stirred evenly to form solution C;

[0050] 4) Under continuous stirring, slowly add solution C to mixed solution B and check the pH value with a pH meter to maintain the pH value at 11.0 to form mixed solution D;

[0051] 5) Stir the mixed solution D under normal temperature and pressure for 10 hours. During the stirring process, continuously add solution C to adjust the pH value to 1...

Embodiment 2

[0056] A method for preparing a nickel-cobalt-manganese composite material from a rare earth-doped hydroxide precursor, comprising the following steps:

[0057] 1) Weigh 2 / 3mol of NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O, prepared into 1000mL of NiSO with a total concentration of 2moL / L 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O mixed aqueous solution A;

[0058] 2) Add 0.67mmoL of yttrium sulfate octahydrate to solution A and stir to dissolve to form solution B;

[0059] 3) Prepare 500mL3.6moL / L of NH 3 ·H 2 O solution, stirred evenly to form solution C;

[0060] 4) Under continuous stirring, slowly add solution C to mixed solution B and check the pH value with a pH meter to maintain the pH value at 11.0 to form mixed solution D;

[0061] 5) Stir the mixed solution D continuously for 10 hours. During the stirring process, continuously add solution C to adjust the pH value to 11.0. After filtering and rinsing with deionized water for 5 times, dry in an ...

Embodiment 3

[0064] A method for preparing a nickel-cobalt-manganese composite material from a rare earth-doped hydroxide precursor, comprising the following steps:

[0065] 1) Weigh 2 / 3mol of NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O, prepared into 1000mL of NiSO with a total concentration of 2moL / L 4 ·6H 2 O, MnSO 4 ·H 2 O and CoSO 4 ·7H 2 O mixed aqueous solution A;

[0066] 2) Add 0.67mmoL scandium nitrate hydrate into solution A and stir to dissolve to form solution B;

[0067] 3) Prepare 500mL3.6moL / L of NH 3 ·H 2 O solution, stirred evenly to form solution C;

[0068] 4) Under continuous stirring, slowly add solution C to mixed solution B and check the pH value with a pH meter to maintain the pH value at 11.0 to form mixed solution D;

[0069] 5) Stir the mixed solution D continuously for 10 hours. During the stirring process, continuously add solution C to adjust the pH value to 11.0. After filtering and rinsing with deionized water for 5 times, dry in an oven...

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Abstract

The invention provides a nickel-cobalt-manganese composite material prepared from a rare earth doped hydroxide precursor, a preparation method and application of the nickel-cobalt-manganese composite material in a battery. The preparation method for the nickel-cobalt-manganese composite material comprises the following steps: preparing a mixed aqueous solution of a nickel source, a cobalt source and a manganese salt, adding an rare earth element yttrium or scandium, conducting stirring and dissolving, adjusting a pH value by using an NH3. H2O solution, conducting continuous stirring, adding lithium hydroxide monohydrate into a solid obtained by filtering, washing and drying, and performing calcining to form the nickel-cobalt-manganese composite material prepared from the rare earth doped hydroxide precursor. When the composite material is used for preparing a lithium ion battery, good cycling stability is obtained, and battery capacity is still stabilized at 184 mAh / g or above after the composite material doped with the rare earth element yttrium is cycled 1000 times; and the stability of the composite material doped with the rare earth element scandium is also relatively good, and the charge-discharge efficiency is also maintained at about 100% after the composite material is cycled 1000 times.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery composite materials, and in particular relates to a nickel-cobalt-manganese composite material prepared from a rare-earth-doped hydroxide precursor, a preparation method thereof, and a lithium-ion battery positive electrode and a lithium-ion battery prepared by using the same. Background technique [0002] In today's world, the development of human society is accelerating day by day, and the demand and use of energy are also greatly increased at the same time as the development of society. Energy issues have become the focus of attention of people all over the world. After the 1950s, due to the outbreak of the oil crisis, it had a huge impact on the world economy. Since the 21st century, the global energy crisis and environmental problems have become increasingly serious, and human beings need to reduce their dependence on fossil fuels. Therefore, it is imminent to vigorously develop ...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 韩阗俐朱梦菲张子瑜朱莉影王艳朱亚军刘金云
Owner ANHUI NORMAL UNIV