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Nickel-cobalt-boron precursor material, preparation method and nickel-cobalt-boron positive electrode material

A cathode material and precursor technology, applied in the field of lithium-ion battery materials, can solve the problems of material capacity attenuation, impedance increase, penetration, etc., and achieve the effects of reducing impedance, suppressing polarization, and improving conductivity

Active Publication Date: 2022-03-01
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When more microcracks are generated, some internal particles will form isolated particles and cannot deintercalate lithium normally, resulting in material capacity attenuation; on the other hand, due to the uneven lithium deintercalation on the surface, a large number of microcracks will be generated near the surface. It will cause the electrolyte to penetrate into the interior along the crack, and the internal particles will react with the electrolyte to form a new interface film, resulting in an increase in impedance

Method used

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  • Nickel-cobalt-boron precursor material, preparation method and nickel-cobalt-boron positive electrode material
  • Nickel-cobalt-boron precursor material, preparation method and nickel-cobalt-boron positive electrode material
  • Nickel-cobalt-boron precursor material, preparation method and nickel-cobalt-boron positive electrode material

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Embodiment 1

[0046] This embodiment includes the following steps:

[0047] (1) Preparation of Ni 0.9 co 0.08 B 0.02 (OH) 2 Precursor

[0048] ① Solution preparation: 118.28 kg of nickel sulfate hexahydrate, 11.25 kg of cobalt sulfate heptahydrate, 0.70 kg of boron oxide and hot pure water were fully mixed and dissolved to prepare 200 L of solution A, the concentration of which was 2.5 mol / L, and the concentration of nickel, cobalt and boron Molar ratio Ni:Co:B=9.0:0.8:0.2; take 25% industrial ammonia water and configure it as 7.5 mol / L solution B, the volume is 100 L, and the molar ratio to solution A is 1.5; 32% industrial hydrogen Sodium oxide was mixed with distilled water to prepare 12.5 mol / L solution C with a volume of 100 L and a molar ratio of 2.5 to solution A; solutions A, B and C were kept at a constant temperature of 40 °C.

[0049] ②Preparation of reaction kettle bottom liquid D: In a 300 L reaction kettle, first add hot pure water to 1 / 2 of the volume of the reaction ket...

Embodiment 2

[0060] This embodiment includes the following steps:

[0061] (1) Preparation of Ni 0.75 co 0.2 B 0.05 (OH) 2 Precursor:

[0062] ① Solution preparation: 157.71 kg of nickel sulfate hexahydrate, 44.98 kg of cobalt sulfate heptahydrate, 2.78 kg of boron oxide and hot pure water were fully mixed and dissolved to prepare 400 L of solution A with a concentration of 2.0 mol / L. Molar ratio Ni:Co:B=7.5:2.0:0.5; take 25% industrial ammonia water and prepare 8.0 mol / L solution B, the volume is 100 L, and the molar ratio of solution A is 1; 32% industrial hydrogen Mix sodium oxide and distilled water to prepare 9.6 mol / L solution C with a volume of 100 L and a molar ratio of 1.2 to solution A; keep solutions A, B, and C at a constant temperature of 45°C.

[0063] ②Preparation of reaction kettle bottom liquid D: In a 500 L reaction kettle, first add hot pure water to 1 / 2 of the volume of the reaction kettle, control the temperature in the kettle to 55°C, stir at 350 rpm, and then co...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a nickel-cobalt-boron precursor material, a nickel-cobalt-boron positive electrode material and a preparation method. The chemical formula of the nickel-cobalt-boron precursor material is NixCoyBz (OH) 2, and the surface energy of the (003) crystal face of the precursor material is calculated to be 1.1-2.5 J / m < 2 > by using CASTEP software. In the process of preparing the nickel-cobalt-boron precursor material through coprecipitation, the temperature of a reaction system is controlled to be 30-90 DEG C, the pH value is 11-12.8, the concentration of a complexing agent is 5-8 g / L, the stirring speed is 300-450 rmp, and the solid content is 150-400 g / L. The nickel-cobalt-boron precursor material is mixed with lithium and calcined to obtain the positive electrode material, and the positive electrode material can be further coated with an indium coating with conductive ions. The positive electrode material prepared by the method is excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a nickel-cobalt-boron precursor and a preparation method thereof, and a nickel-cobalt-boron positive electrode material. Background technique [0002] At present, although high-nickel NCM and NCA ternary cathode materials have high discharge capacity, their capacity retention, cycle stability, and thermal stability are poor. At present, the factors affecting the cycle stability of ternary cathode materials are: [0003] ① Nickel-lithium mixed row: due to Ni 2+ Radius (0.069 nm) vs. Li + The radii (0.076 nm) are close, and the two easily occupy each other in the lattice structure. At this time, there is a phenomenon of cation mixing between the lithium layer and the transition metal layer. Compared with the ideal layered structure, the mixed arrangement of cations leads to the reduction of lithium layer spacing in the crystal structure, and the...

Claims

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Application Information

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IPC IPC(8): C01B35/00H01M4/525H01M4/62H01M10/0525
CPCC01B35/00H01M4/628H01M4/525H01M10/0525H01M2004/028H01M2004/021C01P2004/03Y02E60/10
Inventor 张宝程磊袁涛邓鹏林可博邓梦轩周亚楠
Owner ZHUJI PAWA NEW ENERGY
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