A high tap density, high rate and long-life lithium-rich manganese-based cathode material and preparation method thereof

A positive electrode material, lithium-rich manganese-based technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of fast capacity decay, poor rate performance, low tap density, etc., to improve the diffusion coefficient of lithium ions, process Simple, the effect of reducing the surface energy of crystallization

Active Publication Date: 2020-08-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low tap density, poor rate performance and fast capacity decay of current lithium-rich manganese-based positive electrode materials, and to provide a lithium-rich manganese-based positive electrode material with high tap density, high rate and long life and its preparation method, the positive electrode material is prepared through three steps of precursor preparation, lithium complex sintering and hydrothermal post-treatment

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  • A high tap density, high rate and long-life lithium-rich manganese-based cathode material and preparation method thereof
  • A high tap density, high rate and long-life lithium-rich manganese-based cathode material and preparation method thereof
  • A high tap density, high rate and long-life lithium-rich manganese-based cathode material and preparation method thereof

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specific Embodiment approach 1

[0032] Specific Embodiment 1: This embodiment describes a lithium-rich manganese-based positive electrode material with high tap density, high rate and long life. The chemical formula of the positive electrode material is Li[Li a (Mn x Ni y co z ) 1−a ]O 2 , where, 0

specific Embodiment approach 2

[0033] Specific embodiment 2: A method for preparing the lithium-rich manganese-based positive electrode material with high tap density, high rate and long life as described in specific embodiment 1, using a method of combining coprecipitation, high-temperature sintering and hydrothermal reaction, the method Proceed as follows:

[0034] Step 1: Prepare manganese-nickel-cobalt carbonate spherical precursor by co-precipitation method, the specific steps are as follows:

[0035] (1) According to the chemical formula Li[Li a (Mn x Ni y co z ) 1−a ]O 2Weigh soluble manganese salts, nickel salts, cobalt salts and a certain amount of crystal nucleation control agent in corresponding molar ratios, and dissolve the above raw materials in deionized water to prepare a total concentration of manganese, nickel and cobalt of 0.5~5 mol / L, crystal formation Solution M with a nuclear control agent concentration of 0.05~0.5 mol / L;

[0036] (2) Prepare the carbonate precipitant and comple...

specific Embodiment approach 3

[0044] Specific embodiment three: the preparation method of a high tap density, high rate and long life lithium-rich manganese-based positive electrode material described in specific embodiment two, in step one, the manganese salt is manganese sulfate, manganese formate, manganese acetate, A mixture of one or more of manganese oxalate, manganese chloride or manganese nitrate; the nickel salt is one or more of nickel sulfate, nickel formate, nickel acetate, nickel oxalate, nickel chloride or nickel nitrate Mixture; the cobalt salt is a mixture of one or more of cobalt sulfate, cobalt formate, cobalt acetate, cobalt oxalate, cobalt chloride or cobalt nitrate; the crystal nucleation control agent is triton, polyvinylpyrrolidone , one or more mixtures of cetyltrimethylammonium bromide, polyvinyl alcohol; the carbonate precipitation agent is one or more mixtures of sodium carbonate, sodium bicarbonate, ammonium carbonate ; The complexing agent is one or more mixtures of ammonium bi...

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Abstract

A high-tap-density high-rate long-life lithium-abundant manganese-based positive electrode material and a preparation method thereof belong to the technical field of material synthesis. The chemical formula of the positive electrode material is Li[Li(Mn<x>Ni<y>Co<z>)<1-a>]O<2>. The preparation method comprises: adopting a coprecipitation method to prepare a manganese-nickel-cobalt carbonate spherical precursor; uniformly mixing the manganese-nickel-cobalt carbonate spherical precursor with a lithium source and performing calcination to obtain a spherical lithium-abundant manganese-based positive electrode material; and performing hydro-thermal post-treatment on the spherical lithium-abundant manganese-based positive electrode material to obtain high-tap-density high-rate long-life lithium-abundant manganese-based positive electrode material. Through combined action of a crystal nucleation control agent and a complexing agent, the crystallization surface energy of the coprecipitationsystem is reduced and the tap density of the obtained material is increased. Through the synergistic effect of multiple metals including manganese, nickel, and cobalt, high discharge capacity is provided. A hydro-thermal solid-liquid interface reaction is used to reduce the thickness of a nickel-lithium mixed layer and a mixing arrangement ratio of the surface of secondary particles. The diffusion coefficient of lithium ions is increased, the rate capacity of the obtained material is improved, and the circulation stability of the obtained material is improved.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, in particular to a lithium-rich manganese-based positive electrode material with high tap density, high rate and long life and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in the field of portable electronic devices, and have also shown great application prospects in fields such as electric vehicles and energy storage power stations. The cathode material is currently the sole or main provider of lithium ions in lithium-ion batteries, and has become a bottleneck for the improvement of energy density and price reduction of lithium-ion batteries. High-performance lithium-ion cathode materials should have the following elements: high discharge voltage and capacity, stable and reliable cycle performance, good thermal stability, high el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王振波玉富达王敏君阙兰芳隋旭磊赵磊
Owner HARBIN INST OF TECH
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