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Nickel-cobalt-boron precursor material and preparation method, 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: 2022-05-27
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 and preparation method, nickel-cobalt-boron positive electrode material
  • Nickel-cobalt-boron precursor material and preparation method, nickel-cobalt-boron positive electrode material
  • Nickel-cobalt-boron precursor material and preparation method, 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] ①Solution 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. Molar ratio Ni:Co:B =9.0:0.8:0.2; take 25% industrial ammonia water to configure 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 and distilled water were mixed to prepare 12.5 mol / L solution C, the volume was 100 L, and the molar ratio to solution A was 2.5; 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 kettle, control the temperature in the kettle to 50 °C, ...

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] ①Solution 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, the concentration of which was 2.0 mol / L. Molar ratio Ni:Co:B =7.5:2.0:0.5; take 25% industrial ammonia water to prepare 8.0 mol / L solution B, the volume is 100 L, and the molar ratio to solution A is 1; 32% industrial hydrogen Sodium oxide and distilled water were mixed to prepare 9.6 mol / L solution C, the volume was 100 L, and the molar ratio to solution A was 1.2; solutions A, B, and C were kept 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, and ...

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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 Ni x Co y B z (OH) 2 , using the CASTEP software to calculate the surface energy of the (003) crystal plane of the precursor material to be 1.1 to 2.5 J / m 2 . In the process of preparing nickel-cobalt-boron precursor materials by co-precipitation, the temperature of the reaction system is controlled to be 30-90 °C, the pH value is 11-12.8, the concentration of the complexing agent is 5-8 g / L, and the stirring speed is 300-450 rmp , The solid content is 150~400 g / L. The nickel-cobalt-boron precursor material is calcined with lithium to obtain a positive electrode material, and the positive electrode material can be further coated with an indium coating having conductive ions. The positive electrode material prepared by the invention has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular 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 the high-nickel NCM and NCA ternary cathode materials have high discharge capacity, the capacity retention rate, cycle stability and thermal stability are poor. At present, the factors affecting the cycle stability of ternary cathode materials are: [0003] ①Ni-Li mixed row: due to Ni 2+ Radius (0.069 nm) vs Li + The radius (0.076 nm) is close to each other, and the two are easily occupied by each other in the lattice structure. At this time, there is a cation mixing phenomenon between the lithium layer and the transition metal layer. Compared with the ideal layered structure, cation mixing leads to a decrease in the interlayer spacing of lithium in the crystal structure and an increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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