Positive electrode material precursor and preparation method thereof, positive electrode material and lithium ion battery

A cathode material and precursor technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of reduced structural stability, unsatisfactory structural stability and cycle performance of ternary NCM materials, and reduce the interface internal resistance. , good structural stability, the effect of increasing the specific surface area

Active Publication Date: 2019-07-09
HUBEI JIUBANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual capacity of the improved ternary NCM material is still lower than 200mA / hg, and the structural stability and cycle performance of the improved ternary NCM material are not ideal, especially the structural stability will decline

Method used

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  • Positive electrode material precursor and preparation method thereof, positive electrode material and lithium ion battery
  • Positive electrode material precursor and preparation method thereof, positive electrode material and lithium ion battery
  • Positive electrode material precursor and preparation method thereof, positive electrode material and lithium ion battery

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preparation example Construction

[0075] The present invention provides a kind of preparation method of cathode material precursor, comprises the following steps:

[0076] 1) After mixing nickel salt, manganese salt and / or aluminum salt, cobalt salt and water, a mixed solution is obtained;

[0077] 2) adding the mixed solution, complexing agent and alkali, and reacting to obtain the first mixed solution;

[0078] 3) To the first mixed solution obtained in the above steps, continue to add the mixed solution, complexing agent and alkali, and react again to obtain the second mixed solution;

[0079] 4) Aging the second mixed solution obtained in the above steps to obtain a positive electrode material precursor.

[0080] In the present invention, the selection, ratio, and corresponding optimization principles of materials in the preparation method are preferably consistent with the selection, ratio, and corresponding optimization principles of the materials in the aforementioned positive electrode material precur...

Embodiment 1

[0146] (1) Take nickel sulfate, cobalt sulfate and manganese sulfate respectively to be 21.56kg, 2.8kg and 13.5kg, according to the chemical formula LiNi 0.82 co 0.1 mn 0.08 o 2 The molar ratio concentration in is stirred and dissolved in deionized water, and configured as a 2mol / L mixed salt solution;

[0147] (2) Take by weighing 35.6kg sodium hydroxide, stir and dissolve in deionized water, be configured into a sodium hydroxide solution of 8mol / L, and use as a precipitating agent;

[0148] (3) measure 3400ml of ammonia water, dilute with deionized water, and be configured into 2mol / L ammonia solution, use as complexing agent;

[0149] (4) Heat the water bath in the reactor to 55°C by direct electric heating, slowly add the above three prepared solutions to the reactor respectively, control the pH value of the reactor to 11.3, and react for 35 hours.

[0150] (5) Continue to slowly add the above three prepared solutions to the reaction kettle dropwise, adjust the flow rate...

Embodiment 2

[0162] (1) Take nickel sulfate, cobalt sulfate and manganese sulfate respectively to be 15.77kg, 5.63kg and 3.38kg, according to the chemical molecular formula LiNi 0.6 co 0.2 mn 0.2 o 2 The molar ratio concentration in the solution is stirred and dissolved in deionized water, and configured as a 2mol / L mixed salt solution;

[0163] (2) Take by weighing 17.8kg sodium hydroxide, stir and dissolve in deionized water, configure a 4mol / L sodium hydroxide solution, and use it as a precipitant;

[0164] (3) measure 3400ml of ammonia water, dilute with deionized water, and be configured into 2mol / L ammonia solution, use as complexing agent;

[0165] (4) Heat the water bath in the reactor to 55°C by direct electric heating, slowly add the above three prepared solutions to the reactor respectively, control the pH value of the reactor to 11.25, and react for 30 hours.

[0166] (5) Continue to slowly add the above three configured solutions to the reaction kettle dropwise, adjust the...

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Abstract

The invention provides a positive electrode material precursor. The positive electrode material precursor has the general formula shown as formula (I): NixCoyMnzAl1-x-y-z (OH)2 (I), wherein the positive electrode material precursor is spherical particles composed of positive electrode material precursor hexagonal sheets, and positive electrode material precursor nano particles are compounded on the positive electrode material precursor hexagonal sheets. According to the method, the precursor of a ternary or quaternary positive electrode material is obtained, and the spherical particles are formed by the hexagonal sheets; the precursor hexagonal sheets are further compounded with the precursor nano particles, and the multi-layer hexagonal sheets and the nano particles on the surfaces thereof form spherical particles, so that the structure is complete and uniform, the processing performance of the positive electrode material can be effectively improved by virtue of the nano particles onthe surfaces of the hexagonal sheets, the structural stability of the positive electrode material is improved, and the cycling performance of the positive electrode material is improved; and the specific surface area of the material is increased by virtue of the nano particles on the surfaces of the hexagonal sheets, the internal resistance of the material in the circulation process is lowered, and the rate performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material precursor, a preparation method thereof, a positive electrode material and a lithium ion battery. Background technique [0002] Lithium-ion batteries usually include positive electrodes, negative electrodes, separators, electrolytes, and shells. They have the advantages of high operating voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect, and high cost performance. The main selection object of rechargeable power supply in the fields of electric vehicles, artificial satellites, aerospace and other fields. Among all components of lithium-ion batteries, especially after the invention of super-concentrated electrolytes, electrode materials have always been the main bottleneck for improving their energy density. The positive electrode is one of the key materials of lithium-ion batteries, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 陈建生周云鹏
Owner HUBEI JIUBANG NEW ENERGY TECH
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