A kind of preparation method of high-capacity high-density high-nickel positive electrode material

A high-density, high-density technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve problems such as insufficient precursor compaction, avoid material capacity loss, and avoid cycle performance. The effect of deteriorating and increasing the unit cell volume

Active Publication Date: 2021-11-05
湖南桑瑞新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a method for preparing a high-capacity, high-compaction density, and high-nickel anode material, by using two different D50 high-nickel precursors and mixing them according to a certain ratio. The particle size distribution of the precursor material is improved, and the gaps between large particles can be filled with small particle sizes, thereby improving the shortcoming of insufficient compaction of a single precursor. By first mixing the high-nickel precursor with nano-scale oxides and then Pretreatment can make the additives evenly attached to the precursor, so that the doping elements are evenly distributed in the product bulk phase, improving the stability and cycle performance of the material from the inside out

Method used

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  • A kind of preparation method of high-capacity high-density high-nickel positive electrode material
  • A kind of preparation method of high-capacity high-density high-nickel positive electrode material

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Experimental program
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Embodiment 1

[0029] First weigh the large particle precursor Ni according to the mass ratio of 7:3 0.92 co 0.06 al 0.02 (OH) 2 (D50: 11.75um) 1400g and small particle precursor Ni 0.92 co 0.06 al 0.02 (OH) 2 600g (D50: 3.69um) and 4.462g Y 2 o 3 , the above three were mixed in a high mixer at 500r / min for 20min, and then sintered at 500°C with an oxygen flow rate of 15L / min for 6h to cool down naturally, and passed through a 300-mesh sieve to obtain the pretreated intermediate; the above intermediate solid and 25.191g MgO, 950.4g battery grade lithium hydroxide (Li / Me=1.05, purity 99.1%, particle size D50 is 5.17um) mixed in a high mixer at 500r / min for 30min, and then the mixed powder was placed In the sintering furnace, the oxygen flow rate is 16L / min, and the temperature is raised to 500°C at 1°C / min and kept for 4 hours, and then the temperature is raised to 700°C at 0.6°C / min and held for 16 hours, and then it is naturally lowered to room temperature and crushed through a 300...

Embodiment 2

[0032] First weigh the large particle precursor Ni according to the mass ratio of 8:2 0.90 co 0.04 al 0.06 (OH) 2 (D50: 13.0um) 1600g and small particle precursor Ni 0.90 co 0.04 al 0.06 (OH) 2 400g (D50: 4.52um) and 6.682g SnO 2, the above three were mixed in a high mixer at 400r / min for 30min, and then sintered at 600°C with an oxygen flow rate of 10L / min for 6h to cool down naturally, and passed through a 300-mesh sieve to obtain the pretreated intermediate; the above intermediate body with 30.25g ZrO 2 , 934.89g of battery-grade lithium hydroxide (Li / Me=1.03, purity 99.1%, particle size D50 is 5.17um) was mixed in a high mixer at 600r / min for 20min, and then the mixed powder was placed in a sintering furnace With an oxygen flow rate of 15L / min, heat at 1°C / min to 550°C for 4 hours, then raise the temperature at 0.8°C / min to 730°C and hold for 15 hours, then cool down to room temperature naturally, then crush and pass through a 300-mesh sieve to obtain a high compa...

Embodiment 3

[0035] First weigh the large particle precursor Ni according to the mass ratio of 7:3 0.8 co 0.1 mn 0.1 (OH) 2 (D50: 13.8um) 1400g and small particle precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 600g (D50: 4.07um) and 3.346g Y 2 o 3 , the above three were mixed in a high mixer at 500r / min for 20min, and then sintered at 600°C with an oxygen flow rate of 10L / min for 4h to cool down naturally, and passed through a 300-mesh sieve to obtain the pretreated intermediate; the above intermediate body with 28.23g Al 2 o 3 , 923.28g of battery-grade lithium hydroxide ((Li / Me=1.02, purity 99.1%, particle diameter D50 is 5.17um) was mixed with 500r / min for 40min in the high mixer, and then the mixed powder was placed in the sintering furnace With an oxygen flow rate of 15L / min, heat at 1°C / min to 600°C for 6 hours, then raise the temperature at 1°C / min to 770°C and hold for 16 hours, then naturally cool down to room temperature and then crush through a 300-mesh sieve to obtain a high ...

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Abstract

The invention discloses a method for preparing a high-capacity, high-compaction density, and high-nickel positive electrode material, which includes the following steps: step S1, mixing high-nickel precursors and nanometer metal oxides with two particle sizes at a high speed according to a certain ratio, and then Carry out the first sintering, lower the temperature, and sieve to obtain the intermediate; step S2, mix the intermediate with the grain growth accelerator and battery-grade lithium hydroxide at a high speed according to a certain ratio, and then perform the second sintering, and the sintering is completed and reduced After reaching room temperature, it is crushed and sieved to obtain a high-nickel material with a high compacted density. The present invention changes the particle size distribution of the precursor material by mixing two high-nickel precursors with different D50 according to a certain ratio, and improves the shortcoming of insufficient compaction. Low temperature pretreatment can make the additives evenly attached to the precursor, so that the doping elements are evenly distributed in the bulk phase of the product, which improves the stability and cycle performance of the material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a high-capacity, high-density, high-nickel positive electrode material. Background technique [0002] In recent years, with the rapid development of 3C products such as mobile phones and notebooks, various digital products using lithium-ion batteries are updated and upgraded very quickly, and most of the products tend to be portable and economical, thus affecting the energy density of lithium-ion batteries. put forward higher requirements. [0003] Improving the capacity density of ternary materials is mainly considered from the following three aspects: increasing the compaction density, increasing the discharge voltage and increasing the gram capacity. However, the compaction density of the traditional ternary cathode material is 3.4g / cm 3 ~3.7g / cm 3 , compared to lithium cobalt oxide (compaction density 4.1g / cm 3 ~4.3g / cm 3 ) is low,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 梅晶唐泽勋商士波常敬杭
Owner 湖南桑瑞新材料有限公司
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