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Method for uniformly doping surface of material with metal ions, and product thereof, and application of product

A metal ion, surface uniform technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low charge transport capacity, conductivity of electrode materials, reduction of electrochemical characteristics of rate performance, etc., to achieve reduction and side effects Effects of reaction, improvement of surface stability, and high stability

Active Publication Date: 2018-05-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most common way to construct a passivation shell is surface coating modification, but coating layers such as conventional oxides, phosphates, etc. often have extremely low charge transport capabilities, resulting in poor conductivity of electrode materials after surface treatment. Decrease in electrochemical characteristics such as rate performance

Method used

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  • Method for uniformly doping surface of material with metal ions, and product thereof, and application of product
  • Method for uniformly doping surface of material with metal ions, and product thereof, and application of product
  • Method for uniformly doping surface of material with metal ions, and product thereof, and application of product

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preparation example Construction

[0059] As mentioned above, the present invention provides a preparation method for uniformly doping metal ions on the surface of a material, comprising the following steps:

[0060] 1) First, the precipitation-thermal infiltration reaction is used to disperse the material, the precursor of the metal ion and the precipitant into the solvent, heat and stir, and construct a metal nano-deposition layer on the surface of the material to obtain an intermediate product;

[0061] 2) Then, the intermediate product prepared in step 1) is heat-treated to infiltrate and dope metal ions in a certain thickness range on the surface of the material to obtain a metal doped layer with a nano-layer thickness on the surface of the material.

[0062] In the present invention, the thickness of the uniform deposition layer can be controlled by controlling parameters such as the deposition time, reaction temperature, and subsequent calcination temperature and time of the metal ion precursor during the...

Embodiment 1

[0070] 1. Preparation of Surface Co-doped LiNiMnO

[0071] In a flask, add spinel-type lithium nickel manganate 1g LiNi 0.5 Mn 1.5 O 4 Powder, 0.1 g of cobalt metal precursor cobalt acetate tetrahydrate, and 0.1 g of precipitant urea were dispersed in 30 ml of water to obtain a reaction system. In the reaction system, the concentration of the spinel-type lithium nickel manganate is 33.3 g / L; the concentration of the cobalt acetate tetrahydrate is 2×10 -2 mol / L; the concentration of the urea is 2.5×10 -3 mol / L. The reaction was stirred at 80 °C for 8 h, and the intermediate product was obtained by centrifugation, washing and drying.

[0072] The intermediate product was heated to 700°C at a rate of 5°C / min, calcined at this temperature for 2 h, and then cooled to room temperature to obtain spinel-type lithium nickel manganate powder with a nano-layer cobalt-doped surface on the surface. Its base material is spinel-type lithium nickel manganate LiNi 0.5 Mn 1.5 O 4 , the...

Embodiment 2

[0083] 1. Preparation of Surface Manganese-Doped LiNiMnO

[0084] In a flask, add spinel-type lithium nickel manganate 1g LiNi 0.5 Mn 1.5 O 4 Powder, 0.1 g of manganese metal manganese precursor manganese acetate tetrahydrate, and 0.1 g of precipitant urea were dispersed in 30 ml of water to obtain a reaction system. In the reaction system, the concentration of the spinel-type lithium nickel manganate is 33.3g / L; the concentration of the manganese acetate tetrahydrate is 2×10 -2 mol / L; the concentration of the urea is 2.5×10 -3 mol / L. The reaction was stirred at 80 °C for 8 h, and the intermediate product was obtained by centrifugation, washing and drying.

[0085] The intermediate product was heated to 700°C at a rate of 5°C / min, calcined at this temperature for 2 h, and then cooled to room temperature to obtain spinel-type lithium nickel manganate powder with nano-layer manganese doped on the surface. Its base material is spinel-type lithium nickel manganate LiNi 0.5 ...

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Abstract

The invention relates to a method for uniformly doping the surface of a material with metal ions, and a product thereof, and application of the product. The method mainly comprises the following steps: uniformly depositing a nanolayer of metal ions on the surface of a material (such as a positive electrode material); carrying out special heat treatment to realize inward penetration and doping of the metal ions on the surface of the substrate material within a specific thickness range; and acquiring a quantitatively-doped surface nanolayer on the surface of the substrate material. The positiveelectrode material prepared by using the method can effectively realize passivation of the surface and is reduced in the degree of side reactions and improved in the stability of the material; meanwhile, doping of the metal ions is only carried out in a range of 1 to 30 nm deep from the surface, and the body structure of the material is not affected, so the material can retain its original ion transmission characteristics and overcome the problem of unfavorable influence of traditional coating on the electrochemical performance of the material, and thus, the material has high practical application prospects in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a method for uniformly doping metal ions on the surface of a material, and its products and applications, in particular, lithium ion battery electrode materials. Background technique [0002] In recent years, in order to cope with the negative effects such as environmental pollution and rapid consumption of oil resources brought about by the rapid development of the automobile industry, countries are actively conducting research on electric vehicles (EVs) and hybrid electric vehicles (HEVs) using clean energy. However, the power lithium-ion battery as vehicle power has become a bottleneck for the development of electric vehicles (EVs) and hybrid electric vehicles (HEVs). Among them, the cathode material, as the core of the lithium-ion battery, is the key to improving the energy density of the battery. However, the cathode materials used today ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/38H01M10/0525Y02E60/10
Inventor 曹安民刘晓婵万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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