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Cathode material and preparation method and applications thereof

A technology of positive electrode materials and raw materials, applied in the field of positive electrode materials and their preparation, can solve problems such as poor lithium ion mobility and electronic conductivity, negative impact on material rate performance, and easy peeling, etc., to achieve high practical application prospects, Reduce the effect of surface side reactions and surface corrosion

Active Publication Date: 2017-06-23
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

However, the lithium ion mobility and electronic conductivity of these substances are often poor, and the rate performance of the material is often negatively affected.
Moreover, the shell layer constructed by the coating method, because the shell layer is completely different from the core structure, is prone to peeling off due to volume changes during charging and discharging.

Method used

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  • Cathode material and preparation method and applications thereof
  • Cathode material and preparation method and applications thereof
  • Cathode material and preparation method and applications thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing the above-mentioned cathode material, which includes the following steps:

[0033] (1) The raw material spinel lithium nickel manganese oxide LiNi 0.5 Mn 1.5 O 4-δ (0≤δ<0.1), the doped metal precursor and the precipitant are dispersed in a solvent (the solvent can be water or ethanol); then a regulator is added to adjust the pH of the reaction system to 1.5-7.0, and the reaction is heated and stirred , So that the introduced precursor is converted into a solid phase compound containing the doped metal element, and deposited uniformly on the surface of the spinel-type lithium nickel manganate. After the reaction is completed, it is separated, washed, and dried to obtain an intermediate product .

[0034] (2) Grind the intermediate product of step (1) uniformly, calcinate, and cool to room temperature to obtain the positive electrode material of the present invention.

[0035] The use of the precursor form of the doped ...

Embodiment 1

[0046] 1. Preparation of core-shell lithium nickel manganate doped with surface aluminum

[0047] Put spinel lithium nickel manganate LiNi in the flask 0.5 Mn 1.5 O 4-δ (0≤δ-3 mol / L; the concentration of the diammonium hydrogen phosphate is 2.5×10 -3 mol / L, the concentration of the ammonium formate is 1.06 mol / L.

[0048] The regulator hydrochloric acid was added to the reaction system to adjust the pH of the reaction system to 3, the reaction was stirred at 45° C. for 2 hours, and the intermediate product was obtained by centrifugation, washing and drying.

[0049] The intermediate product was heated to 800°C at a rate of 4°C / min, calcined at this temperature for 3 hours, and then cooled to room temperature to obtain spinel-type lithium nickel manganate powder with a core-shell structure doped with aluminum on the surface. Its core is spinel lithium nickel manganese oxide LiNi 0.5 Mn 1.5 O 4-δ (0≤δ<0.1), the doping amount of aluminum in the shell layer is 0.29wt.% of spinel lithium ...

Embodiment 2

[0061] 1. Preparation of iron-doped core-shell lithium nickel manganate

[0062] Put spinel lithium nickel manganate LiNi in the flask 0.5 Mn 1.5 O 4-δ (0≤δ-3 mol / L; the concentration of the ammonium formate is 1.06 mol / L.

[0063] Adding regulator nitric acid to the reaction system to adjust the pH of the reaction system to 2.0, stirring at 50° C. for 2 hours, centrifuging, washing, and drying to obtain an intermediate product.

[0064] The intermediate product was heated to 800°C at a rate of 3°C / min, and calcined at this temperature for 3 hours to obtain spinel-type lithium nickel manganate powder with a core-shell structure doped with iron on the surface. Its core is spinel lithium nickel manganese oxide LiNi 0.5 Mn 1.5 O 4-δ (0≤δ<0.1), the iron doping amount of the shell layer is 0.62wt% of spinel lithium nickel manganese oxide. The thickness of the shell layer is approximately 25 nm.

[0065] 2. Preparation of spinel-type lithium nickel manganate electrode with core-shell struc...

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Abstract

The invention discloses a cathode material and a preparation method and applications thereof. The cathode material is spinel type lithium nickel manganese oxide LiNi<0.5>Mn<1.5>O<4-[delta]> 0=<[delta]<0.1. The cathode material has metal elements, the concentration of the metal elements gradually decreases from the surface to the inner, thus a shell layer, which has a structure similar with the nucleus structure, is formed, moreover, the tight connection thickness is greater than 0; and the metal elements account for not more than 10 wt% of the weight of the spinel type lithium nickel manganese oxide (X<=10wt%). A precipitate controllable method is adopted to quantitatively precipitate metal elements on the surface of lithium nickel manganese oxide; then a thermal treatment is carried out to make the metal elements penetrate from the surface to the interior so as to in-situ form a shell layer on the surface of nucleus of lithium nickel manganese oxide; the similarity of the structures of the shell layer and the nucleus is high, the compatibility is good, and the problem of nucleus-shell separation is well solved. Due to the shell layer, the thermal stability, circulation stability, and structure stability of the cathode material during the charge-discharge process are prominently improved, and the cathode material has a wide application prospect in the field of energy storage.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and specifically relates to a positive electrode material and a preparation method and application thereof. Background technique [0002] As a reliable and efficient energy storage device, lithium-ion batteries have established their unshakable position since they came out. Among them, cathode materials, as the core of lithium-ion batteries, have always been the focus of scientific research personnel. Currently, the commonly used cathode materials are limited by their lower energy density and higher price, and their performance cannot yet satisfy users. Therefore, the development of high-energy density cathode materials has extremely important practical significance. [0003] Spinel-type lithium nickel manganate developed on the basis of lithium manganate, with a working voltage of up to 4.7V (vs.Li / Li + ), can store more electric energy under the same capacity. And its energy d...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/131H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 曹安民朴俊宇万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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