LiNixCo1-x-yMnyO2 cathode material coated with boron-lithium composite oxide and preparation method thereof

A composite oxide, nickel-cobalt-lithium manganese oxide technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve problems such as poor cycle stability, achieve low cost, reduce side reactions, and improve chemical stability. Effect

Inactive Publication Date: 2015-02-18
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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Example Embodiment

[0022] Embodiment 1: a preparation method of a nickel-cobalt lithium manganate positive electrode material with a surface-coated boron-lithium composite oxide, which is completed according to the following steps:

[0023] ①Weigh the compounds of the lithium source and the boron source respectively according to the stoichiometric ratio, and prepare a mixed solution of Li:B=2:1 with absolute ethanol under stirring conditions;

[0024] ②According to the mass ratio of LiNi x Co 1-x-y Mn y O 2 :α-Li 4 B 2 O 5 = 1:0.06 to weigh the positive electrode material, add the positive electrode material to the mixed solution obtained in step 1, and ultrasonicate for 2 hours to disperse uniformly to obtain a suspension;

[0025] 3. Under stirring conditions, slowly add a dispersant to the suspension obtained in step 2. until the system is viscous, and the dispersant is 9% of the mass of the suspension;

[0026] ④ place step ③ gained viscous substance in oven, dry, evaporate to obtain ...

Example Embodiment

[0031] Embodiment 2: a method for preparing a nickel-cobalt-lithium manganate positive electrode material with a surface-coated boron-lithium composite oxide, which is completed according to the following steps:

[0032] ①Weigh the compounds of the lithium source and the boron source respectively according to the stoichiometric ratio, and prepare a mixed solution of Li:B=2:1 with absolute ethanol under stirring conditions;

[0033] ②According to the mass ratio of LiNi x Co 1-x-y Mn y O 2 :α-Li 4 B 2 O 5 = 1:0.10 to weigh the positive electrode material, add the positive electrode material to the mixed solution obtained in step (1), and ultrasonicate for 1.1 h to disperse evenly to obtain a suspension;

[0034] 3. Under stirring conditions, slowly add a dispersant to the suspension obtained in step 2. until the system is viscous, and the dispersant is 10% of the mass of the suspension;

[0035] ④ place step ③ gained viscous substance in oven, dry, evaporate to obtain sol...

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Abstract

A LiNixCo1-x-yMnyO2 cathode material coated with boron-lithium composite oxide is a LiNixCo1-x-yMnyO2 cathode material with its surface coated with a layer of boron-lithium composite oxide. A preparation method of the material comprises the following steps: adding prepared LiNixCo1-x-yMnyO2 into a mixed alcoholic solution of a lithium source and a boron source, uniformly dispersing LiNixCo1-x-yMnyO2 in the solution by ultrasonic treatment, adding a dispersant, fully immersing the material in the solution, evaporating a solvent and carrying out heat treatment so as to obtain alpha-Li4B2O5-coated LiNixCo1-x-yMnyO2. Contact between a coating and the cathode material at the molecular level is realized, and thickness of the coating layer is uniform. In addition, by coating the surface of the cathode material with the boron-lithium composite oxide, diffusion coefficient of lithium ion is raised, and ionic conductivity of the material is enhanced. Meanwhile, direct contact between an electrolyte and the cathode material is avoided effectively, and side effect of electrodes is minimized. Thus, chemical stability and cycle performance of the cathode material are improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a nickel-cobalt lithium manganese oxide positive electrode material with a surface coated with boron-lithium composite oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, and electrolytes. Among them, the high price and low reversible specific capacity of cathode materials have become an important bottleneck restricting the development of lithium-ion batteries. Therefore, finding high-quality and low-cost cathode materials is the main direction for the development of lithium-ion batteries in the future. [0003] Layered nickel-cobalt lithium manganate cathode material (LiNi x co 1-x-y mn y o 2 ), due to the synergistic effect of nickel, cobalt and manganese, it has the advantages of high energy d...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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