A kind of single crystal nickel cobalt lithium manganate precursor and its preparation method and application

A technology of nickel-cobalt-lithium-manganese-oxide and its precursors, which is applied in the field of single-crystal nickel-cobalt-lithium-manganese oxide precursors and its preparation, can solve the problems of easy breakage, uncontrollable shape, and many side reactions at the interface, so as to ensure uniformity , easy to disperse by ball milling, good electrochemical performance

Active Publication Date: 2020-12-18
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, secondary spherical particles have the following problems: (1) poor mechanical strength, easy to break during electrode compaction, and exposed particles inside the material, resulting in increased side reactions and metal ion dissolution, and decreased electrochemical performance; (2) secondary spherical particles The primary particles inside and outside the particle ball are small and have many structural defects, and the structure is easy to collapse during high-voltage charging and discharging; (3) The interior of the secondary spherical particles is difficult to coat, and there are many interface side reactions during high-voltage charging and discharging, resulting in damage to the material structure; (4) The secondary ball particles are seriously inflated
Although the preparation process of the hydroxide precursor can make nickel, cobalt, and manganese uniformly distributed, the hydroxides of cobalt and manganese are easily oxidized in an alkaline environment. Get precursors with suitable particle size
In this regard, many researchers use inert gas protection, or add a reducing agent and need to monitor the reaction pH at all times, but the process control requirements are very high, and the operation is relatively cumbersome.

Method used

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  • A kind of single crystal nickel cobalt lithium manganate precursor and its preparation method and application
  • A kind of single crystal nickel cobalt lithium manganate precursor and its preparation method and application
  • A kind of single crystal nickel cobalt lithium manganate precursor and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Weigh Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 and Al(NO 3 ) 3 Dissolved in deionized water to form a 0.1mol / L mixed salt solution, mixed with 0.1mol / L Na 2 CO 3 The solution is input into the reactor (2L) of dispersing PVP (concentration is 0.01mol / L) concurrently, wherein, mixed salt solution, Na 2 CO 3 The feed flow rate of the solution was 1mL / min, the dispersion rate of PVP was 1mL / min, the reaction temperature was 30°C, and the stirring intensity was controlled at 300r / min. To the end of the reaction mixed salt solution, Na 2 CO 3 The volume of solution and PVP is close to 1:1:1) After centrifugation, washing and drying, Ni 0.5 co 0.2 mn 0.2 Al 0.1 CO 3 precursor material. The particle size of the prepared precursor material D 50 The particle size is 6um, the shape is uniformly dispersed nanosheets, the primary particle size is about 2um single crystal, the crystallinity is good, the scanning electron microscope picture is as follows figure 1 As ...

Embodiment 2

[0051] Weigh NiSO according to the Ni, Co, Mn molar ratio of 0.6:0.2:0.2 4 、CoSO 4 , MnSO 4 Dissolve in deionized water to form a 1mol / L mixed salt solution, and mix with 2mol / L NaHCO 3 The solution is input into the reaction kettle (2L) of dispersing PEG-400 (concentration is 0.1mol / L) in parallel flow, wherein, mixed salt solution, NaHCO 3 The feed flow rate of the solution is 1mL / min, the dispersion rate of PEG-400 is 1mL / min, the reaction temperature is 80°C, the stirring intensity is controlled at 800r / min, the reaction liquid overflows naturally after the reactor is full, and the reaction is stirred for 30 hours After (to the end of the reaction mixed salt solution, NaHCO 3 The volume of the solution and PEG-400 is close to 1:1:1) After centrifugation, washing and drying, Ni 0.6 co 0.2 mn 0.2 (HCO 3 ) 2 precursor material. The particle size of the prepared precursor material D 50 It is 10um, the shape is uniformly dispersed hexagonal bricks, and the crystallini...

Embodiment 3

[0053] According to Ni, Co, Mn, V molar ratio is 0.75:0.1:0.1:0.05: Weigh NiC 2 o 4 、CoC 2 o 4 , MnC 2 o 4 , NH 4 VO 3 Dissolved in deionized water to form a 5mol / L mixed salt solution, mixed with 5mol / L (NH 4 )2 CO 3 The solution is input into the reactor (2L) of dispersing op-10 (concentration is 0.05mol / L) in parallel flow, wherein, mixed salt solution, (NH 4 ) 2 CO 3 The feed flow rate of the solution is 1mL / min, the dispersion rate of op-10 is 1mL / min, the reaction temperature is 50°C, the stirring intensity is controlled at 500r / min, the reaction liquid overflows naturally after the reactor is full, and the reaction is stirred for 20 hours After (to the end of the reaction mixed salt solution, (NH 4 ) 2 CO 3 The volume of solution and op-10 is close to 1:1:1) After centrifugation, washing and drying, Ni 0.75 co 0.1 mn 0.1 V 0.05 CO 3 precursor material. The particle size of the prepared precursor material D 50 It is 15um, and the shape is uniformly di...

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Abstract

The invention provides a single crystal nickel cobalt lithium manganate precursor and a preparation method and application thereof. The preparation method comprises the following steps: dissolving soluble nickel salt, cobalt slat, manganese salt and/or salt doped with metal ions M in deionized water to obtain a mixed salt solution; mixing the salt solution with a carbonate solution and feeding thesolutions in parallel to a reaction kettle where a surfactant is dispersed to be stirred and reacted; and then carrying out centrifugalization, washing and drying to obtain the single crystal nickelcobalt lithium manganate precursor. The chemical formula of the single crystal nickel cobalt lithium manganate precursor is NixCoyMnzM(1-x-y-z)CO3, wherein M is the doped metal ions, x is greater than0 but less than 0.8, y is greater than 0 but less than 0.4, z is greater than 0 but less than 0.4 and (1-x-y-z) is greater than or equal to 0 but less than or equal to 0.1. The preparation process issimple to operate, free of an inert atmosphere or an additive, continuous to prepare and easy to implement industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a precursor of single crystal nickel cobalt lithium manganese oxide and its preparation method and application. Background technique [0002] my country's new energy vehicles are in an important period of rapid development. Power batteries are the core components of new energy vehicles, and lithium-ion batteries are considered to be the first choice for automotive power batteries due to their excellent comprehensive performance. There are many types of positive electrode materials for lithium-ion power batteries, mainly including nickel-cobalt lithium manganese oxide ternary materials, lithium iron phosphate, spinel lithium manganese oxide and other new materials, among which nickel-cobalt lithium manganese oxide ternary positive electrode materials have specific capacity High, long cycle life, low toxicity, cheap and good synergistic effect of the three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 秦显忠杨改蔡飞鹏王波蒋波陈花
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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