Positive electrode active material for lithium ion secondary battery and preparation method for positive electrode active material

A positive active material, secondary battery technology, applied in secondary batteries, battery electrodes, positive electrodes, etc., can solve the problem of high alkalinity, achieve high energy density, improve electrochemical performance, improve stability and safety performance. Effect

Active Publication Date: 2014-06-18
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, whether it is a binary cathode material system or a tern

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0022] Example 1

[0023] Cathode material for lithium ion secondary battery, the general formula of the core material of the lithium ion secondary battery can be expressed as Li x Ni y MMe a O 2 , X=0.9, y=0.1, a=0, M is Co z Mn 1-y-z , Z=0 The coating material is vanadium oxide, and the content is 15%. The lithium ion secondary battery cathode material is a lithium composite oxide of secondary particles formed by agglomeration of primary particles.

[0024] The preparation method of the material: mix lithium hydroxide and nickel manganese oxyhydroxide uniformly according to the proportion, control the sintering temperature to 500℃, the sintering time 40h, and air in, and the ventilation volume is 30m 3 / h, the sintered material is classified, sieved, and iron is removed to obtain the required nuclear material; then dry-coated; sintered again, the sintering temperature is 450℃, the sintering time is 36h, air is introduced, and the amount of ventilation 30m 3 / h, the sintered mater...

Example Embodiment

[0025] Example 2

[0026] Cathode material for lithium ion secondary battery, the general formula of the core material of the lithium ion secondary battery can be expressed as Li x Ni y MMe a O 2 , X=1.25, y=0.8, a=0.1, Me is alumina, M is Co z Mn 1-y-z , Z=0.2, the coating material is aluminum oxide, and the content is 0.01%. The lithium ion secondary battery cathode material is a lithium composite oxide of secondary particles formed by aggregation of primary particles.

[0027] Material preparation method: mix lithium hydroxide, nickel cobalt oxyhydroxide, and aluminum oxide according to the proportion, control the sintering temperature to 1200℃, the sintering time 5h, oxygen gas, and the air flow rate is 2m 3 / h, the sintered material is crushed, classified, sieved, and iron is removed to obtain the required core material; then the wet coating is carried out, the solvent used is isopropanol; after drying, the sintering temperature is 1100℃ , The sintering time is 5h, oxygen is i...

Example Embodiment

[0028] Example 3

[0029] Cathode material for lithium ion secondary battery, the general formula of the core material of the lithium ion secondary battery can be expressed as Li x Ni y MMe a O 2 , X=1.02, y=0.5, a=0.05, Me is magnesium oxide, M is Co z Mn 1-y-z , Z=0.2, the coating material is aluminum fluoride, and the content is 3.5%. The lithium ion secondary battery cathode material is a lithium composite oxide of secondary particles formed by aggregation of primary particles.

[0030] Material preparation method: mix lithium hydroxide, nickel oxyhydroxide, cobalt manganese, and magnesium oxide according to the proportions, control the sintering temperature to 880℃, the sintering time 12h, let in air, and the ventilation rate is 10m 3 / h, the sintered material is crushed, classified, sieved, and iron is removed to obtain the required core material; then dry-coated; sintered again, the sintering temperature is 700℃, the sintering time is 10h, and air is introduced. The ventilat...

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Abstract

The invention discloses a positive electrode active material for a lithium ion secondary battery. According to the positive electrode active material for the lithium ion secondary battery, a substance N covers a nuclear material; the general formula of the nuclear material is LixNiyMMeaO2, wherein x is greater than or equal to 0.90 and less than or equal to 1.25, y is greater than 0 and less than 1, and a is greater than for equal to 0 and less than or equal to 0.1. A preparation method for the positive electrode active material comprises the steps of preparing the raw materials; sintering and crushing the nuclear material; performing coverage; performing twice sintering or multiple times of sintering; washing and drying the product. Due to doping and coverage, the electrochemical performance of the positive electrode active material for the lithium ion secondary battery is improved, and the circulation performance and the high-temperature performance are particularly improved; meanwhile, the structure of the material is stabilized, and the stability and the safety of the material are improved; when a negative electrode of the battery is a lithium negative electrode, and the working voltage is 4.7V, the material is high in energy density, high in stability and excellent in circulation performance and heat stability.

Description

technical field [0001] The invention relates to an inorganic functional material and a high-tech battery technology, in particular to a positive electrode active material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the technological progress and demand of mobile electronic equipment are also developing rapidly, and the demand for lithium-ion secondary batteries as energy sources is correspondingly increasing sharply; at the same time, as environmental problems become more and more serious, the current Research on electric vehicles or hybrid vehicles that can replace fossil fuels is becoming more and more extensive, so the requirements for lithium-ion secondary batteries are also increasing, high energy density, high operating voltage, high safety, long life cycle and Low self-discharge etc. [0003] Lithium-ion battery positive electrode material nickel cobalt lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525
CPCY02E60/122H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 李兴翠池田一崇施冬雷张永虎许国干周罗成
Owner NANTONG RESHINE NEW MATERIAL
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