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Surface coating modification method of LiNi0.5Mn1.5O4 cathode material

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of surface coating modification of lithium nickel manganese oxide positive electrode materials, can solve problems such as being susceptible to corrosion and reduced cycle performance, and achieve improved cycle performance, corrosion inhibition, and good lithium The effect of ionic conductivity

Active Publication Date: 2016-10-12
CHANGSHU INSTITUTE OF TECHNOLOGY
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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 that the purpose of the present invention is in order to improve the lithium nickel manganese oxide positive electrode material to be easily corroded in the electrolytic solution, the problem that cycle performance reduces; 2 (PO 4 ) 3 ) The coating material is attached to the surface of the electrode material, followed by heat treatment to form a fast ion conductor type solid electrolyte layer preparation method

Method used

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  • Surface coating modification method of LiNi0.5Mn1.5O4 cathode material
  • Surface coating modification method of LiNi0.5Mn1.5O4 cathode material
  • Surface coating modification method of LiNi0.5Mn1.5O4 cathode material

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Embodiment 1

[0037] (1) The preparation process of lithium nickel manganese oxide required for the implementation of coating in the present invention is as follows: respectively weigh 1.25 parts by weight of nickel acetate and 3.68 parts by weight of manganese acetate, add 80 mL of deionized water to dissolve completely, and drop in the concentration within 1 hour. 11mL of 1mol / L LiOH solution, add an appropriate amount of ammonia water to adjust the pH value to 11-12, heat and concentrate the co-precipitation solution at 80°C until viscous, transfer it to a blast drying oven for 6 hours at 100°C, and dry After grinding, place the product in a muffle furnace for pre-calcination at 500°C in an air atmosphere for 6 hours, grind the pre-fired product fully, press it into tablets under a pressure of 5 MPa, place the sample sheet in a high-temperature reaction furnace at 700°C for 3 hours, and heat up Heat to 900°C and keep it warm for 6 hours, lower the temperature to 650°C and keep it warm for...

Embodiment 2

[0042] (1) Dissolve 0.0129g of lithium acetate and 0.105g of n-butyl titanate in absolute ethanol solution, then add 2g of lithium nickel manganese oxide, heat up with stirring, react at 80°C for 2 hours, then evaporate the solvent until it evaporates to dryness , Lithium nickel manganese oxide coated with lithium acetate-titanium dioxide was obtained.

[0043] (2) According to the mass ratio of 3:97, 0.0534g of ammonium dihydrogen phosphate and the lithium acetate-titanium dioxide-coated lithium nickel manganese oxide prepared in step 1 were mixed and dispersed in deionized water, and the percentage concentration range was 20%. Stir and heat up, react at 80° C. for 5 hours, and then dry the solution to obtain lithium acetate-titanium dioxide-ammonium dihydrogen phosphate composite-coated lithium nickel manganese oxide.

[0044] (3) Put the lithium acetate-titanium dioxide-ammonium dihydrogen phosphate compound-coated lithium nickel manganese oxide obtained in step 2 into an a...

Embodiment 3

[0048] (1) Dissolve 0.065g of lithium acetate and 0.175g of n-butyl titanate in absolute ethanol solution, then add 2g of lithium nickel manganese oxide, heat up under stirring, react at 70°C for 3 hours, then evaporate the solvent until evaporated to dryness , Lithium nickel manganese oxide coated with lithium acetate-titanium dioxide was obtained.

[0049] (2) According to the mass ratio of 5:95, 0.089 g of ammonium dihydrogen phosphate and the lithium acetate-titanium dioxide-coated lithium nickel manganese oxide prepared in step 1 were mixed and dispersed in deionized water, and the percentage concentration range was 15%. Stir and heat up, react at 90° C. for 4 hours, and then dry the solution to obtain lithium acetate-titanium dioxide-ammonium dihydrogen phosphate composite-coated lithium nickel manganese oxide.

[0050] (3) Put the lithium acetate-titanium dioxide-ammonium dihydrogen phosphate compound-coated lithium nickel manganese oxide obtained in step 2 into an alum...

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Abstract

The invention discloses a surface coating modification method of a LiNi0.5Mn1.5O4 cathode material. The method comprises steps as follows: firstly, lithium-titanium dioxide-coated LiNi0.5Mn1.5O4 is prepared, then ammonium dihydrogen phosphate is added, and lithium-titanium dioxide-ammonium dihydrogen phosphate composite-coated LiNi0.5Mn1.5O4 is obtained through a reaction; finally, LiNi0.5Mn1.5O4 is heated to 650-750 DEG C in an air atmosphere, then cooled to 400-600 DEG C for secondary heat treatment and cooled to the room temperature, and then a cathode material product is obtained. According to the method, the surface of the electrode material is coated with a fast ion conductor, namely, LiTi2(PO4)3, an artificial solid electrolyte layer is formed, corrosion caused by an electrolyte to the electrode material is effectively inhibited, the cycling stability of the material is improved, besides, the fast ion conductor has the good lithium ionic conductivity, and the cycling performance of the electrode material under the conditions of high-rate charging and discharging is improved.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, specifically relates to the technical field of lithium ion batteries, in particular to a method for surface coating modification of a lithium nickel manganese oxide cathode material. Background technique [0002] With the rapid development of electric vehicles in recent years, lithium-ion batteries are receiving more and more attention and development. Lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) are considered to be an important part of electrode materials for next-generation Li-ion batteries due to their high voltage and high energy density. Lithium nickel manganese oxide materials generally have two crystal structures: one is disordered LiNi 0.5 mn 1.5 o 4 Fd3m space point group, formed by randomly distributed transition metal ions forming an octahedral 16d grid, the other belonging to the ordered LiNi 0.5 mn 1.5 o 4 Space group P4332, nickel and ma...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525H01M4/62
CPCH01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 杨刚王佳伟李为立
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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