Positive electrode material precursor, preparation method thereof and positive electrode material

A technology of positive electrode materials and precursors, which is applied in the field of positive electrode materials, positive electrode material precursors and their preparation, can solve the problems of low energy density of lithium-ion batteries, and does not consider the influence of the packing density of secondary particles.

Active Publication Date: 2018-02-16
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this cathode material precursor does not consider the impact of the secondary particle size on the packing density, which affects the low energy density of lithium-ion batteries.

Method used

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  • Positive electrode material precursor, preparation method thereof and positive electrode material
  • Positive electrode material precursor, preparation method thereof and positive electrode material
  • Positive electrode material precursor, preparation method thereof and positive electrode material

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preparation example Construction

[0037] The present invention provides a kind of preparation method of cathode material precursor, comprises the following steps:

[0038] A) mixing the nickel-containing compound, the cobalt-containing compound and the manganese-containing compound with water to obtain a mixed solution;

[0039] B) mixed solution, precipitation agent and complexing agent are mixed, carry out co-precipitation reaction, obtain nickel-cobalt-manganese precursor solution, described nickel-cobalt-manganese precursor is represented by general formula (I):

[0040]C) During the coprecipitation reaction process, the oxidizing agent is mixed with the nickel-cobalt-manganese precursor solution, and a partial oxidation reaction is carried out to obtain a positive electrode material precursor, which is composed of general formula (I) and A composite precursor of secondary spherical particles formed by the accumulation of primary particles represented by general formula (II);

[0041] Ni x co y mn 1-x-...

Embodiment 1

[0085] (1) configure the mixed solution of nickel sulfate, cobalt sulfate, manganese sulfate, the mol ratio of described nickel sulfate, cobalt sulfate, manganese sulfate is 1:1:4, the total concentration of nickel sulfate, cobalt sulfate, manganese sulfate in the mixed solution It is 2mol / L.

[0086] (2) Configure a sodium carbonate precipitant solution with a concentration of 4mol / L.

[0087] (3) Configure an ammonia solution with a concentration of 2 mol / L.

[0088] (4) above-mentioned three kinds of solutions are continuously added in the reactor with stirring, and the ammoniacal liquor add-on of control is (complexing agent: the total molar ratio of nickel cobalt manganese=1:2), regulates the flow rate of sodium carbonate precipitant solution to Control the pH value to 8.1. After 10 hours of reaction, add 0.5 mol / L hydrogen peroxide solution with 5% of the total moles of oxidants every 5 hours. The positive electrode material precursor with high tap density and small pa...

Embodiment 2

[0095] (1) configure the mixed solution of nickel nitrate, cobalt nitrate, manganese nitrate, the mol ratio of described nickel sulfate, cobalt sulfate, manganese sulfate is 1 / 3:1 / 3:1 / 3, nickel sulfate, cobalt sulfate in mixed solution , The total concentration of manganese sulfate is 2mol / L.

[0096] (2) The sodium carbonate precipitating agent solution that configuration concentration is 3mol / L.

[0097] (3) The ammonia water complexing agent solution whose concentration is 1mol / L is configured.

[0098] (4) above-mentioned three kinds of solutions are continuously added in the reactor with stirring, the control complexing agent add-on is (complexing agent: nickel-cobalt-manganese mol ratio=1:2), regulates the flow rate of sodium carbonate precipitant solution to Control the pH value to be 8.3, add the 0.02mol / L peroxyacetic acid solution=of 4% of the total moles of oxidizing agent every 8 hours after the reaction for 15h, add the total moles of the oxidizing agent after 5 ...

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Abstract

The invention provides a preparation method of a positive electrode material precursor. The preparation method comprises the following steps of A) mixing a nickel-containing compound, a cobalt-containing compound, a manganese-containing compound and water to obtain a mixed solution; B) mixing the mixed solution, a precipitant and a complexing agent, and performing co-precipitation reaction to obtain a Ni-Co-Mn precursor solution, wherein the Ni-Co-Mn precursor is shown in a general formula (I); and C) mixing an oxidization agent and the Ni-Co-Mn precursor solution during the co-precipitation reaction process, and performing partial oxidization reaction to obtain the positive electrode material precursor, wherein the positive electrode material precursor is a secondary spherical particle composite precursor formed by accumulating primary particles shown in the general formula (I) and a general formula (II), the general formula (I) is Ni<x>Co<y>Mn<1-x-y>CO<3>, the general formula (II) isNi<x>Co<y>Mn<1-x-y>O, 0<x<1, 0<y<1, and (x+y)<1.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material precursor, a preparation method thereof, and a positive electrode material. Background technique [0002] Power lithium-ion batteries have become the core of new energy vehicles. With people's demand for battery life, the development of a 300Wh / Kg battery system has attracted people's attention. However, with the increase in battery energy density, the battery safety performance and rate of lithium-ion batteries have increased. Performance is also a growing concern. [0003] At present, the preparation of lithium nickel cobalt manganate (LiNi x co y mn 1-x-y o 2 ) commercial common method co-precipitation-high temperature solid-phase method: that is, the co-precipitation method is used to prepare the precursor, because it can give full play to the synergistic effect of the three, so that the specific capacity of the mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 顾庆文夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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