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A kind of preparation method of core-shell structure ternary cathode material

A core-shell structure and positive electrode material technology, which is applied in the field of continuous preparation of core-shell structure ternary positive electrode materials for lithium-ion batteries, can solve problems such as difficult core-shell structure precursors, poor product batch stability, and unfavorable industrialization implementation. Achieve the effects of shortening the total reaction time, good consistency, and favorable industrial production

Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing single-pot co-precipitation method needs to first synthesize crystal particles with high nickel content, and then perform solid-liquid separation and other operations on the generated crystal particles, and then add the crystal nuclei to another reaction kettle to deposit on the surface of the crystal particles. Compounds with high manganese content can obtain core-shell composite precursors, so it is difficult to continuously realize the controllable preparation of core-shell structure precursors; moreover, the intermittent operation process is complicated and the unit cost is high, which may easily lead to poor stability of product batches, which is not conducive to industrialization implement

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  • A kind of preparation method of core-shell structure ternary cathode material
  • A kind of preparation method of core-shell structure ternary cathode material
  • A kind of preparation method of core-shell structure ternary cathode material

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Embodiment 1

[0035] In this embodiment, according to the chemical formula LiNi respectively 0.5 co 0.2 mn 0.3 o 2 (nuclear) and LiNi 0.2 co 0.2 mn 0.6 o 2 (shell) ingredients.

[0036] A preparation method of a core-shell structure layered positive electrode material, comprising the following steps:

[0037] Step 1. Solution preparation:

[0038] Weigh NiSO according to the molar ratio of nickel, cobalt and manganese in a ratio of 5:2:3 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 0 three kinds of salts, three kinds of mixtures are added in No. 1 dissolving tank, and add deionized water under normal pressure and stir until dissolving completely, be made into concentration 3mol / L rich nickel mixed salt solution; Press nickel, cobalt, manganese mol ratio to be 2:2:6 Accurately weigh NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O three kinds of salts, add three kinds of mixtures in No. 2 dissolving tank, and add deionized water under normal pressure and stir until fully dissolved...

Embodiment 2

[0050] In this embodiment, according to the chemical formula LiNi 0.6 co 0.2 mn 0.2 o 2 and LiNi 0.2 mn 0.8 o 2 ingredients.

[0051] A preparation method of a core-shell structure layered positive electrode material, comprising the following steps:

[0052] Step 1. Solution preparation:

[0053] Weigh NiCl according to the molar ratio of nickel, cobalt and manganese in the ratio of 6:2:2 2 ·6H 2 O, CoCl 2 ·6H 2 O and MnCl 2 4H 2 0 three kinds of salts, three kinds of mixtures are added in No. 1 dissolving tank, and add deionized water under normal pressure and stir until fully dissolving, make concentration 1mol / L nickel-rich mixed salt solution; By nickel, manganese mol ratio is 2: 8 Accurately weigh NiCl 2 ·6H 2 O and MnCl 2 4H 2 O two kinds of salts, add the three kinds of mixtures into the No. 2 dissolution tank, and add deionized water under normal pressure and stir until completely dissolved to form a concentration of 1mol / L manganese-rich mixed salt so...

Embodiment 3

[0062] In this embodiment, according to the chemical formula LiNiO 2 and LiNi 0.2 co 0.1 mn 0.7 o 2 ingredients.

[0063] A preparation method of a core-shell structure layered positive electrode material, comprising the following steps:

[0064] Step 1. Solution preparation:

[0065] Ni(NO 3 ) 2 ·6H 2 O is added to the No. 1 dissolution tank, and deionized water is added under normal pressure and stirred until completely dissolved to form a nickel-rich mixed salt solution with a concentration of 0.5mol / L; the molar ratio of nickel, cobalt, and manganese is 2:1 : The ratio of 7 is called Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mn(CH 3 COO) 2 4H 2 0 three kinds of salts, three kinds of mixtures are added in No. 2 dissolving tanks, and add deionized water under normal pressure and stir until completely dissolving, make concentration 0.5mol / L manganese-rich mixed salt solution; Weigh sodium hydroxide solid and add Dissolved in deionized water to prepare 0.5...

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Abstract

The invention provides a preparation method of a core-shell structure ternary positive electrode material, which belongs to the technical field of lithium ion battery positive electrode materials. The present invention adopts the continuous co-precipitation method. The process steps are first to prepare nickel-rich precursor particles in the No. 1 reactor, and then inject it into the No. 2 reactor through a metering pump to continue crystallization, and the manganese-rich particles will grow on the surface of the nickel-rich particles. , to form core-shell structure precursor particles, and then mix the precursor particles with lithium source raw materials, and use high-temperature calcination to prepare core-shell structure ternary cathode materials (LiNi x co y mn 1‑x‑y o 2 ), the preparation method has good consistency, continuous operation shortens the total reaction time, reduces energy consumption, and the process is simple, and the particle size of the prepared positive electrode material is controllable, the particle distribution is uniform, and it has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a continuous preparation of lithium-ion battery core-shell structure ternary cathode material Li(Ni, Co, Mn)O 2 According to the method, the material is a layered manganese-rich shell-layered nickel-rich core. Background technique [0002] In recent years, lithium-ion batteries have become a research hotspot due to their high energy density, environmental friendliness, and no memory effect. In lithium-ion battery systems, the selection of positive and negative electrode materials and separators are key factors that determine battery performance. Among them, the positive electrode Due to the slow development of materials, it has become the key to restricting the further development of lithium-ion batteries. Nickel-cobalt-manganese-oxygen composite oxide cathode material Li(Ni,Co,Mn)O 2 It is favored for its high capacity, low cost and hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M10/0525
CPCC01G53/50C01P2002/72C01P2004/03C01P2004/61C01P2006/40H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 熊杰滑纬博雷天宇陈伟胡音王显福晏超贻
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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