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Nickel-cobalt-manganese core-shell structure precursor, preparation method thereof and positive electrode material

A core-shell structure and cathode material technology, which is applied to nickel-cobalt-manganese core-shell structure precursors and their preparation, and the field of cathode materials, can solve the problems of low tap density of precursors, high content of Na and S in precursors, and poor crystallinity. , to achieve the effect of adjustable core size, wide process application range and good crystallinity

Active Publication Date: 2020-10-02
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This uniform and porous material can increase the contact area with the electrolyte to a certain extent, and at the same time can buffer the volume change during the charging and discharging process of the material, but the precursor prepared in this way has a low tap density and poor crystallinity. , the content of Na and S in the precursor is relatively high

Method used

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  • Nickel-cobalt-manganese core-shell structure precursor, preparation method thereof and positive electrode material
  • Nickel-cobalt-manganese core-shell structure precursor, preparation method thereof and positive electrode material
  • Nickel-cobalt-manganese core-shell structure precursor, preparation method thereof and positive electrode material

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Embodiment 1

[0036] Preparation method of nickel-cobalt-manganese core-shell structure precursor:

[0037] Preparation total metal concentration is the nickel sulfate, cobalt sulfate, manganese sulfate solution of 2mol / L, nickel, cobalt, manganese molar ratio 35:35:30, the sodium hydroxide solution of preparation 2mol / L, the ammonia solution of preparation 6mol / L as Complexing agent. Add pure water to the reactor with a volume of 100L, control the temperature at 40°C, adjust the pH value to 12.0 with alkali, adjust the ammonium ion concentration to 5g / L with ammonia water, and continuously feed nitrogen into the reactor.

[0038] In the first stage, the pH value is controlled at 11.2-12.0, the linear stirring speed is controlled at 7.0m / s, the metal salt feed flow is controlled at 20mL / min, the ammonium ion concentration is controlled at 5g / L, the temperature is controlled at 40°C, and nitrogen atmosphere, after the precursor particles grow to 2.0 μm, switch the reaction conditions and en...

Embodiment 2

[0040] Preparation method of nickel-cobalt-manganese core-shell structure precursor:

[0041] Prepare the nickel sulfate, cobalt sulfate, manganese sulfate solution that total metal concentration is 2mol / L, nickel, cobalt, manganese mol ratio 50:20:30, prepare the sodium hydroxide solution of 2mol / L, prepare the ammonia solution of 6mol / L as Complexing agent. Add pure water to the reactor with a volume of 100L, control the temperature at 60°C, adjust the pH value to 12.0 with alkali, adjust the ammonium ion concentration to 5g / L with ammonia water, and continuously feed nitrogen into the reactor.

[0042] In the first stage, the pH value was controlled at 11.3-12.0, the linear stirring speed was controlled at 5.5m / s, the metal salt feed flow rate was controlled at 30mL / min, the ammonium ion concentration was controlled at 5g / L, the temperature was controlled at 60°C, and nitrogen atmosphere, after the precursor particles grow to 3.0 μm, switch the reaction conditions and enter ...

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Abstract

The invention provides a nickel-cobalt-manganese core-shell structure precursor and a preparation method thereof. The precursor is compact in inner core and has pores; the shell is loose, and the primary particles are radially arranged on the inner core. The precursor structure is beneficial to diffusion of Li ions and permeation of an electrolyte in the lithium mixing and sintering process, provides a rapid migration channel for the Li ions in the charging and discharging process, and meets the structural requirements of tap density and porosity. The precursor is synthesized by adopting a wetmethod, the reaction process is divided into a first stage and a second stage, the switching point of the first stage and the second stage is determined according to the size requirement of the innercore part of the precursor, and the reaction conditions are adjusted. The preparation method is simple in process control, free of newly increased cost, wide in process application range, good in product crystallinity, low in impurity Na and S content and adjustable in precursor kernel size on the basis of an existing mainstream intermittent method process.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and specifically relates to a nickel-cobalt-manganese core-shell structure precursor and a preparation method thereof, and a positive electrode material prepared from the nickel-cobalt-manganese core-shell structure precursor. Background technique [0002] Lithium-ion batteries are widely used in communication equipment, tablet computers, power tools, electric vehicles, energy storage systems and other fields due to their small size, high energy density, environmental protection and high efficiency, and no memory effect. Cathode material is a key component of lithium-ion batteries and plays a decisive role in battery performance. In recent years, nickel-cobalt-manganese ternary materials have become the most promising power battery materials due to their obvious advantages such as high energy density, good cycle performance, safety and economy. Cathode materials for power batteries n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/01C01P2004/61C01P2004/62C01P2004/64C01P2006/17C01P2006/80H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 胡海诗李玉云刘凯黎力何绪锋张娉婷刘庭杰熊意球孟立君胡志兵张海艳
Owner JINCHI ENERGY MATERIALS CO LTD
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