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Method for synthesizing lithium battery cathode material through solvent-free solid-phase method

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of performance degradation and uneven mixing of sintered materials, and achieve the effect of reducing oxygen defects and excellent electrochemical performance.

Active Publication Date: 2015-12-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of non-uniform mixing caused by the diversification of raw materials in the mixing stage of the prior art in the process of solvent-free solid-phase method synthesis, thereby reducing the performance of the finished sintered material, and to provide a solvent-free solid-phase method. The method of lithium battery cathode material, adding a multifunctional additive in the mixing stage solves the corresponding problems

Method used

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  • Method for synthesizing lithium battery cathode material through solvent-free solid-phase method
  • Method for synthesizing lithium battery cathode material through solvent-free solid-phase method
  • Method for synthesizing lithium battery cathode material through solvent-free solid-phase method

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Embodiment 1

[0024] a, the palmitic acid (C 15 h 31 COOH) and flake graphite are mixed uniformly according to the mass ratio of 99.9:0.01 to obtain multifunctional auxiliary agent;

[0025] b. Li source (LiCO 3 ), ternary coprecipitate [(Ni 0.5 mn 0.2 co 0.3 )OH x ] and the multifunctional auxiliary agent are added into a three-dimensional mixer and mixed uniformly for 6 hours to obtain a precursor, and the mass percentage of the multifunctional auxiliary agent in the total amount of the precursor is 1%;

[0026] c. Mix the uniformly mixed precursor at 0.5°C.min -1 After the heating rate is raised to 200°C, the ternary material (LiNi 0.5 mn 0.2 co0.3 o 2 );

Embodiment 2

[0028] a, the pearlescent acid (C 16 h 33 COOH) and pearlescent aluminum acetate ((C 16 h 33 COO) 3 A1) According to the mass ratio of 1:1, add flake graphite and mix uniformly to obtain multifunctional auxiliary agent, and the mass percentage of described flake graphite accounting for the total amount of multifunctional auxiliary agent is 0.03%;

[0029] b. Li source (LiCO 3 ), Mn source (MnO 2 ) and the multifunctional auxiliary agent are added to a three-dimensional mixer and mixed uniformly for 8 hours to obtain a precursor, and the mass percentage of the multifunctional auxiliary agent accounting for the total amount of the precursor is 3%;

[0030] c. Mix the uniformly mixed precursor at 0.8°C.min -1 The heating rate can be increased to 200 °C and then sintered at high temperature to obtain micron-sized large single-crystal spinel lithium manganese oxide (LiMn 2 o 4 )Material;

Embodiment 3

[0032] A, ferric stearate ((C 17 h 35 COO) 3 Fe) and flake graphite are uniformly mixed according to a mass ratio of 99.5:0.05 to obtain a multifunctional additive;

[0033] b. Li source (LiCO 3 ), Mn source (MnO 2 ) and the multifunctional auxiliary agent are added to several inclined mixing materials and mixed uniformly for 10 hours to obtain the precursor; the mass percentage of the multifunctional auxiliary agent accounting for the total amount of the precursor is 5%;

[0034] c. Mix the uniformly mixed precursor at 1°C.min -1 The heating rate can be increased to 200 °C and then sintered at high temperature to obtain micron-sized large single-crystal spinel lithium manganese oxide (LiMn 2 o 4 )Material;

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Abstract

The invention relates to a preparation method for synthesizing a lithium battery cathode material through a solvent-free solid-phase method. The method comprises the following steps that solid-state high-hydrocarbon fatty acid and / or solid-state high-hydrocarbon fatty acid salt and flake graphite are mixed evenly to obtain a multifunctional auxiliary; the multifunctional auxiliary and raw materials are added into mixing equipment together to prepare a precursor; high-temperature sintering is performed on the precursor after heat treatment is performed on the precursor, and then the lithium battery cathode material is obtained. According to the method, by adding the multifunctional auxiliary of which the main components comprise the solid-state high-hydrocarbon fatty acid and / or the solid-state high-hydrocarbon fatty acid salt in the mixing stage, the problem that diversified scattering of the raw materials is difficult is solved through the lubrication action of high-hydrocarbon fatty acid radicals, metal ions carried by the high-hydrocarbon fatty acid salt can also be evenly dispersed in the precursor in the mixing process to serve as a doping ion source in body doping, and the high-hydrocarbon fatty acid radicals can be decomposed at high temperature to generate gas, so that the fluffy degree of the precursor is increased and hardening is relieved; therefore, generation of oxygen vacancy is reduced in the sintering process, and the prepared lithium battery cathode material has the advantages of being few in defect, excellent in electrochemical performance and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a method for synthesizing positive electrode materials of lithium batteries by a solvent-free solid-phase method. Background technique [0002] Under the dual pressure of environmental pollution and energy crisis, the development of new energy vehicles has become the trend of the situation, among which lithium-ion batteries have good application significance. Among various cathode materials for lithium batteries, spinel LiMn 2 o 4 It has the advantages of rich manganese resources, low cost, high thermal stability, and environmental friendliness, and has been successfully applied in the first generation of plug-in or pure electric vehicles. However, in order to meet the public's wider demand for new energy vehicles, increasing the capacity of on-board batteries has become the development direction of lithium batteries. Doping Ni into LiMn 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525Y02E60/10
Inventor 汪涛彭文王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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