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A self-complementing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and preparation method thereof

A positive electrode material, nickel-cobalt-manganese technology, applied in the field of self-replenishing lithium-type single-crystal nickel-cobalt-manganese composite ternary positive electrode materials and its preparation, can solve the problem of poor bonding between lithium-replenishing materials and positive electrode materials, high preparation costs and high mixing costs , limited effect of lithium supplementation, etc., to achieve the effects of stable cycle performance, reduced production cost, and high discharge specific capacity

Active Publication Date: 2022-03-22
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a separate preparation of Li 2 NiO 2 The lithium supplement material is mixed with the positive electrode material, the preparation cost and mixing cost are high, and the lithium supplement material is poorly combined with the positive electrode material, the positive electrode material itself will still consume a certain amount of active lithium ions, and the lithium supplement effect is limited

Method used

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  • A self-complementing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and preparation method thereof
  • A self-complementing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and preparation method thereof
  • A self-complementing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and preparation method thereof

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Embodiment 1

[0044] A method for preparing a self-replenishing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material, characterized in that it comprises the following steps:

[0045] S1. Weigh NiSO according to the molar ratio Ni:Co:Mn=8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use 100mL deionized water to make the total concentration of transition metal ions is 2mol L -1 mixed metal salt solution, and then use 200mL deionized water to prepare NaOH and ammonia water at a molar ratio of 1:2 to make the NaOH concentration 2mol L -1 mixed alkali solution;

[0046] S2. Add 50mL deionized water to the continuous stirred tank reactor as the reaction base liquid, add ammonia water dropwise to adjust the pH of the reaction base liquid to about 11, feed argon as the protective gas, set the stirring speed to 600r / min, and react The temperature is set to 55°C, and the metal salt solution and alkali solution are injected at the same time. Afte...

Embodiment 2

[0055] A method for preparing a self-replenishing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material, characterized in that it comprises the following steps:

[0056] S1. Weigh NiSO according to the molar ratio Ni:Co:Mn=83:10:7 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use 100mL deionized water to make the total concentration of transition metal ions is 2mol L -1 mixed metal salt solution, and then use 200mL deionized water to prepare NaOH and ammonia water at a molar ratio of 1:2 to make the NaOH concentration 2mol L -1 mixed alkali solution;

[0057] S2. Add 50mL deionized water into the continuous stirred tank reactor as the reaction base liquid, add ammonia water dropwise to adjust the pH of the reaction base liquid to about 11, feed argon as the protective gas, set the stirring speed to 650r / min, and react The temperature is set to 55°C, and the metal salt solution and alkali solution are injected at the same time. ...

Embodiment 3

[0065] A method for preparing a self-replenishing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material, characterized in that it comprises the following steps:

[0066] S1. Weigh NiSO according to the molar ratio Ni:Co:Mn=90:6:4 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use 100mL deionized water to make the total concentration of transition metal ions is 2mol L -1 mixed metal salt solution, and then use 200mL deionized water to prepare NaOH and ammonia water at a molar ratio of 1:2 to make the NaOH concentration 2mol L -1 mixed alkali solution;

[0067] S2. Add 50mL deionized water to the continuous stirred tank reactor as the reaction base liquid, add ammonia water dropwise to adjust the pH of the reaction base liquid to about 11, feed argon as the protective gas, set the stirring speed to 700r / min, and react The temperature is set to 55°C, and the metal salt solution and alkali solution are injected at the same time. Aft...

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Abstract

The invention discloses a self-replenishing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and a preparation method thereof, comprising the following steps: S1, preparing a nickel-cobalt-manganese ternary positive electrode material precursor by using a co-precipitation method; S2, preparing Lithium salt is pulverized and fully mixed with the nickel-cobalt-manganese ternary positive electrode material precursor according to the ratio of Li: (Ni+Co+Mn)=1.3-2.2 to obtain a mixture; S3, the mixture is calcined in stages , first calcined at 450-550°C, then calcined at 730-780°C, and then obtained after cooling in the furnace. In the present invention, by adopting an excessive amount of lithium salt and an improved lithiation sintering process, the interior of the obtained final product is LiNi x co y mn z o 2 , the exterior is Li 2 NiO 2 Composite materials with higher discharge specific capacity than conventionally used Li 2 NiO 2 The lithium-replenishing material has stable cycle performance, and can be directly used as a positive electrode material with lithium-replenishing effect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a self-complementing lithium-type single crystal nickel-cobalt-manganese composite ternary positive electrode material and a preparation method thereof. Background technique [0002] As a new type of secondary energy device, lithium-ion batteries have been widely used to power 3C electronic products. In recent years, they have been used in electric vehicles because of their high discharge specific capacity, high energy density, and long cycle life. field. In order to further meet the requirements of long cruising range of electric vehicles and achieve the goal of driving more than 300km on a single charge, lithium-ion batteries are required to achieve an energy density of more than 350Wh / kg. Therefore, compared with graphite anodes with higher maturity, high energy density High-nickel-type nickel-cobalt-manganese ternary cathode material LiNi x co y mn z o 2 (0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 陈来陈刚苏岳锋卢赟李宁曹端云包丽颖陈实吴锋
Owner 北京理工大学重庆创新中心