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High-nickel ternary positive electrode material and preparation method thereof

A positive electrode material, high-nickel technology, applied in the field of high-nickel ternary positive electrode material and its preparation, to achieve the effects of improving cycle stability, preventing dissolution, and good first-time discharge efficiency

Inactive Publication Date: 2020-06-05
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few public reports on the preparation of high-nickel ternary cathode materials with high specific capacity, good rate performance and good cycle stability by introducing a variety of cations or co-doping of cations and anions.

Method used

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  • High-nickel ternary positive electrode material and preparation method thereof
  • High-nickel ternary positive electrode material and preparation method thereof
  • High-nickel ternary positive electrode material and preparation method thereof

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preparation example Construction

[0063] Another aspect of the present invention provides a method for preparing a high-nickel ternary positive electrode material, preferably a method for preparing the high-nickel ternary positive electrode material described in the first aspect of the present invention, the method comprising the following steps:

[0064] Step 1, mixing high-nickel ternary precursor, lithium source and dopant;

[0065] According to the present invention, in step 1, the high-nickel ternary precursor is a nickel-cobalt-manganese ternary precursor, preferably one or more selected from hydroxides, oxides and carbonates of nickel-cobalt-manganese.

[0066] According to the present invention, in step 1, the high-nickel ternary precursor is the hydroxide of nickel-cobalt-manganese, preferably by formula Ni x co y mn 1-x-y (OH) 2 The hydroxide represented by, among them, 0.8≤x≤0.95, 00.88 co 0.08 mn 0.04 (OH) 2 .

[0067] In the present invention, the source of the high-nickel ternary precursor...

Embodiment 1

[0116] Weigh 200g of Ni with a particle size of 10-20μm 0.88 co 0.08 mn 0.04 (OH) 2 Precursor, 96.595g LiOH·H 2 O, 0.526gZrO 2 and 0.1703g TiO 2 In a blender, mix the four powders evenly;

[0117] The mixed powder was put into a crucible, and sintered once in a box furnace, and the heating rate was controlled to be 5°C / min, and the calcination was carried out under an oxygen atmosphere of 820°C and kept for 12h. Then cool down to room temperature naturally, crush, sieve, and evenly refine the powder, then mix 100g of the obtained material with 100g of deionized water, stir rapidly for 10min, then filter and dry;

[0118] Take the dried sample 100g and 0.5g B 2 o 3 Coating materials are uniformly mixed,

[0119] Then put it into a box-type furnace for secondary sintering, control the heating rate to 3°C / min, carry out calcination under 300°C oxygen atmosphere and keep it warm for 6h. Then it is naturally lowered to room temperature, crushed and sieved to obtain a high...

Embodiment 2

[0123] Weigh 100g of Ni with a particle size of 10-20μm 0.88 co 0.08 mn 0.04 (OH) 2 , 100g of Ni with a particle size of 3-6μm 0.88 co 0.08 mn 0.04 (OH) 2 Precursor, 47.272g LiOH·H 2 O, 0.263gZrO 2 and 0.086g MgO in a stirrer to mix the four powders evenly;

[0124] Put the mixed powder into a crucible and sinter in a box furnace at a rate of 4°C / min. Calcination is carried out under an oxygen atmosphere of 800°C and kept for 10 hours, then it is naturally lowered to room temperature and crushed. Sieve to make the powder evenly refined, then mix 70g of the obtained material with 70g of deionized water, stir rapidly for 12min, then filter and dry;

[0125] Take the sample 60g after drying and Al 2 o 3 Coating material 0.18g is mixed evenly;

[0126] Then put it into a box-type furnace for secondary sintering, control the heating rate to 4°C / min, and carry out calcination under an oxygen atmosphere of 700°C and keep it for 7h. Then it is naturally lowered to room te...

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Abstract

The invention discloses a high-nickel ternary positive electrode material and a preparation method thereof. The high-nickel ternary positive electrode material is formed by a matrix and a coating layer, wherein the matrix is prepared from a high-nickel ternary precursor, a lithium source and a doping agent, the doping agent is a compound containing M', M' is a doping element, M' is one or more selected from a metal element and / or a non-metal element, the coating layer is formed by a coating material, and the coating material is a metal or non-metal compound. The preparation method comprises the following steps of: mixing a high-nickel ternary precursor, a lithium source and a doping agent, carrying out primary sintering and post-treatment to obtain a doped high-nickel ternary positive electrode material matrix, mixing the doped high-nickel ternary positive electrode material matrix with a coating material, and carrying out secondary sintering and post-treatment to obtain the high-nickel ternary positive electrode material. The high-nickel ternary positive electrode material is subjected to multi-element doping and surface coating co-modification, crystal lattices are stable, and alithium ion battery prepared from the high-nickel ternary positive electrode material has excellent rate capability, cycling stability and safety performance.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of 3C products such as mobile phones and notebooks, higher requirements have been placed on the energy density, power density and service life of lithium-ion batteries. Among them, the positive electrode material occupies a core position in lithium-ion batteries, and its performance will directly affect various performances of the battery, such as energy storage density, cycle life, safety, etc. In the market application of many lithium-ion battery cathode materials, the high nickel-based ternary layered oxide cathode material synthesizes LiCoO due to the synergistic effect between Ni, Co and Mn. 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials are considered t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 吕姚王燕超林若虚杨俊凌仕刚沙金苏迎春张溪
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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