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Modified high-nickel ternary positive electrode material as well as preparation method and application thereof

A cathode material, high nickel technology, applied in electrical components, battery electrodes, structural parts, etc., can solve the problems of poor thermal stability and cycle stability, and achieve the effects of good cycle performance, high specific capacity, and uniform particle size

Inactive Publication Date: 2022-08-05
江阴普朗克科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned technical deficiencies, the present invention provides a modified high-nickel ternary positive electrode material and its preparation method and application. x co (1-x) / 2 mn (1-x) / 2 o 2 (0.6≤x≤0.9) modified to contain vanadium-doped LiNi x co (1-x) / 2 mn (1-x) / 2 o 2 (0.6≤x≤0.9) as the matrix, then use nickel hydroxide for gel coating, and finally undergo calcination treatment to obtain a modified high-nickel ternary positive electrode material to overcome the existing high-nickel ternary positive electrode materials. Technical defects of poor thermal stability and cycle stability

Method used

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  • Modified high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Modified high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Modified high-nickel ternary positive electrode material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0041] A method for preparing a modified high-nickel ternary positive electrode material, comprising the following steps:

[0042] (1) Vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 (0.6≤x≤0.9) Matrix preparation:

[0043] S1, the Ni (NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 and ammonium vanadate were dissolved in deionized water and stirred for 6 hours, and then citric acid was added dropwise to obtain a mixed solution. The mixed solution was first stirred at 90 °C for 14 hours for gelation, and then dried in an oven until the water completely evaporated. , to obtain the pretreatment;

[0044] Among them, Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 The molar ratio is 6:2:2;

[0045] S2. Mix the pretreatment of step S1 with lithium nitrate uniformly, first sinter at 450°C for 3h, then keep at 750°C for 12h, and cool down naturally to obtain vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 matrix;

[0046] Among them, Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 ...

Embodiment 2

[0050] A method for preparing a modified high-nickel ternary positive electrode material, comprising the following steps:

[0051] (1) Vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 (0.6≤x≤0.9) Matrix preparation:

[0052] S1, the NiSO 4 , CoSO 4 , MnSO 4 and ammonium vanadate were dissolved in deionized water and stirred for 4 hours, and then citric acid was added dropwise to obtain a mixed solution. The mixed solution was first stirred at 80 °C for 13 hours for gelation, and then dried in an oven until the water completely evaporated. , to obtain the pretreatment;

[0053] Among them, NiSO 4 , CoSO 4 , MnSO 4 The molar ratio is 8:1:1;

[0054] S2. Mix the pretreatment of step S1 with lithium carbonate uniformly, sinter at 400 °C for 3 hours, then keep at 800 °C for 10 hours, and cool down naturally to obtain vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 matrix;

[0055] Among them, NiSO 4 , CoSO 4 , MnSO 4 The molar ratio of the total substance to lithi...

Embodiment 3

[0059] A method for preparing a modified high-nickel ternary positive electrode material, comprising the following steps:

[0060] (1) Vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 (0.6≤x≤0.9) Matrix preparation:

[0061] S1, the Ni (CH 3 COO) 2 , Co(CH 3 COO) 2 , Mn(CH 3 COO) 2 and ammonium vanadate were dissolved in deionized water and stirred for 8 hours, and then citric acid was added dropwise to obtain a mixed solution. The mixed solution was first stirred at 100 ° C for 12 hours, and then dried in an oven until the water completely evaporated to obtain a pretreatment product. ;

[0062] Among them, Ni(CH 3 COO) 2 , Co(CH 3 COO) 2 , Mn(CH 3 COO) 2 The molar ratio is 9:0.5:0.5;

[0063] S2. Mix the pretreatment of step S1 with lithium nitrate uniformly, first sinter at 500°C for 3h, then keep at 700°C for 14h, and cool down naturally to obtain vanadium-doped LiNi x Co (1-x) / 2 Mn (1-x) / 2 O 2 matrix;

[0064] Among them, Ni(CH 3 COO) 2 , Co(CH 3 CO...

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Abstract

The invention relates to the technical field of preparation of lithium ion battery positive electrode materials, in particular to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. According to the modified high-nickel ternary positive electrode material, vanadium-doped LiNixCo (1-x) / 2Mn (1-x) / 2O2 (x is greater than or equal to 0.6 and less than or equal to 0.9) is taken as a matrix, nickel hydroxide gel is firstly coated outside the matrix, and then high-temperature treatment is carried out, so that the modified high-nickel ternary positive electrode material is obtained. The preparation method comprises the following steps: modifying a high-nickel ternary positive electrode material LiNixCo (1-x) / 2Mn (1-x) / 2O2 (x is more than or equal to 0.6 and less than or equal to 0.9), taking vanadium-containing doped LiNixCo (1-x) / 2Mn (1-x) / 2O2 (x is more than or equal to 0.6 and less than or equal to 0.9) as a matrix, then carrying out gel coating by adopting nickel hydroxide, and finally carrying out calcination treatment to obtain the modified high-nickel ternary positive electrode material. The technical defects of poor thermal stability and cycling stability of a high-nickel ternary positive electrode material in the prior art are overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] Energy is the key to economic development and social progress, and building a society supported by sustainable energy is a topic of worldwide concern. As the market's requirements for electric cruising range increase, lithium-ion batteries are required to have higher energy density, and the cathode material is a key factor affecting the energy density of lithium-ion batteries. High-nickel ternary cathode materials have the advantages of high specific capacity, good rate performance, and relatively low cost, and are considered to be one of the most promising cathode materials for power lithium-ion batteries. [0003] Ternary materials on the market mainly refer to oxides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M4/131
CPCH01M4/366H01M4/628H01M4/505H01M4/525H01M10/0525H01M4/131H01M2004/028Y02E60/10
Inventor 龚建平
Owner 江阴普朗克科技有限公司
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