Cation-doped gradient high-nickel multi-material precursor and preparation method and application thereof

A technology of doping gradients and cations, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as hindering the industrialization process, poor rate performance and cycle performance of multi-component materials, and complex synthesis process

Inactive Publication Date: 2019-02-01
圣戈莱(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the high-nickel multi-component material has a high specific capacity, its disadvantages are also more prominent: (1) due to the high nickel content, the high-nickel multi-component material has poor thermal stability and low safety performance; (2) due to the high nickel content 2+ Radius and Li + similar radius, Ni 2+ with Li + Occupy each other, resulting in the occurrence of cation mixing, and the disordered state of this structure directly leads to poor rate performance and cycle performance of multi-component materials.
(3) The surface pH of high-nickel multi-component materials is relatively high, and it is easy to absorb water. During the processing, there is a high requirement for the humidity of the environment, which greatly increases the difficulty of cell process processing and equipment investment costs.
However, due to the complex synthesis process of gradient structure high-nickel multi-component materials, low efficiency, and high requirements for supporting equipment, it has seriously hindered its industrialization process.

Method used

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  • Cation-doped gradient high-nickel multi-material precursor and preparation method and application thereof
  • Cation-doped gradient high-nickel multi-material precursor and preparation method and application thereof
  • Cation-doped gradient high-nickel multi-material precursor and preparation method and application thereof

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Effect test

Embodiment 1

[0040] This embodiment prepares Al 3+ Gradient high-nickel ternary precursor Ni modified by doping 0.7992 co 0.0999 mn 0.0999 Al 0.001 (OH) 2.001 and gradient high-nickel multi-element material LiNi 0.7992 co 0.0999 mn 0.0999 Al 0.001 o 2 , including the following steps:

[0041] (1) Preparation of nickel salt and doped metal salt solutions: Weigh 7.992 mol of nickel sulfate hexahydrate and 0.005 mol of aluminum sulfate octadecahydrate respectively, dissolve them in an appropriate amount of pure water, and prepare 8.002 liters of salt solution A.

[0042] (2) cobalt salt and manganese salt solution preparation: with nickel salt, cobalt salt and manganese salt according to mol ratio Co:Mn=8:1:1, according to the result of step (1), take by weighing 0.999mol cobalt sulfate heptahydrate and 0.999 mol of manganese sulfate monohydrate was dissolved in an appropriate amount of pure water to prepare 1.998 liters of salt solution B.

[0043] (3) Precipitating agent preparat...

Embodiment 2

[0054] This embodiment prepares Zr 4+ Gradient high-nickel ternary precursor Ni modified by doping 0.7976 co 0.0997 mn 0.0997 Zr 0.003 (OH) 2.006 and gradient high-nickel multi-element material LiNi 0.7976 co 0.0997 mn 0.0997 Zr 0.003 o 2 , including the following steps:

[0055] (1) Preparation of nickel salt and doped metal salt solutions: Weigh 7.976 mol of nickel sulfate hexahydrate and 0.03 mol of zirconium sulfate tetrahydrate respectively, dissolve them in an appropriate amount of pure water, and prepare 8.006 liters of salt solution A.

[0056] (2) cobalt salt and manganese salt solution preparation: with nickel salt, cobalt salt and manganese salt according to molar ratio Co:Mn=8:1:1, according to the result of step (1), take by weighing 0.997mol cobalt sulfate heptahydrate and 0.997mol of manganese sulfate monohydrate was dissolved in an appropriate amount of pure water to prepare 1.994 liters of salt solution B.

[0057] (3) Precipitating agent preparatio...

Embodiment 3

[0062] This embodiment prepares Zr 4+ with Al 3+ Gradient high-nickel multi-component precursor Ni modified by co-doping 0.7968 co 0.0996 mn 0.099 6 Zr 0.003 Al 0.001 (OH) 2.007 and gradient high-nickel multi-element material LiNi 0.7968 co 0.0996 mn 0.0996 Zr 0.003 Al 0.001 o 2 , including the following steps:

[0063] (1) Preparation of nickel salt and doped metal salt solution: Weigh 7.968mol nickel sulfate hexahydrate, 0.03mol zirconium sulfate tetrahydrate, and 0.005mol aluminum sulfate octadecahydrate respectively, dissolve them in an appropriate amount of pure water, and prepare 8 liters of salt solution A.

[0064] (2) cobalt salt and manganese salt solution preparation: with nickel salt, cobalt salt and manganese salt according to molar ratio Co:Mn=8:1:1, according to the result of step (1), take by weighing 0.996mol cobalt sulfate heptahydrate and 0.996mol of manganese sulfate monohydrate was dissolved in an appropriate amount of pure water to prepare ...

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Abstract

The invention discloses a cation-doped gradient high-nickel multi-material precursor and a preparation method and application thereof. An automatic program control system is combined with a special-designed U-shaped reactor; material component ratio and a preparation process are controlled; therefore, a high-nickel multi-material precursor with nano-spherical microstructure is prepared in controllable manner. The precursor herein comprises a core and a multilayer shell portion attached to the same. A cathode material prepared with the precursor herein has continuously gradient changes in composition and structure; no evident boundary occurs in the cathode material. A core portion of the cathode material has high nickel content, so that the specific capacity is very high; a shell portion has more stable structure and better electrochemical properties; doping components help improve conductivity and battery rate performance; therefore, a gradient material with excellent comprehensive performance is attained. The preparation method herein is highly operable, easy to control and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of cathode materials for lithium-ion secondary batteries, and in particular relates to a gradient high-nickel multi-component material precursor and a preparation method and application thereof. Background technique [0002] As a new type of green energy, lithium-ion secondary batteries (hereinafter referred to as "lithium-ion batteries") have been widely used in consumer electronics, electric vehicles, and various energy storage power systems. The rapid development of the industry has led to increasing requirements for lithium-ion batteries: increasing energy density and power density, extending service life, improving safety performance and reducing costs. The performance of lithium-ion batteries is largely determined by the cathode material. Therefore, the development of high-performance, high-safety, and low-cost cathode materials is an opportunity and a huge challenge for the further development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 闫东伟吴志坚赵宜男谷丰宏
Owner 圣戈莱(北京)科技有限公司
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