Preparation method of high-nickel positive electrode material of lithium secondary battery

A lithium secondary battery and positive electrode material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of difficult doping process, complicated preparation process, and difficult application process, and achieve the control of depth and content , The production process is flexible, and the effect of avoiding aggravation and destruction

Inactive Publication Date: 2019-05-21
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the use of liquid additives and wetting agents for the preparation of single crystal-like precursors, the actual preparation process is more complicated, and involves the combustion and decomposition of organic matter, and the temperature of the prefabrication process is low, so it is difficult to achieve an effective doping process. Therefore, the actual Difficulty in the application process

Method used

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  • Preparation method of high-nickel positive electrode material of lithium secondary battery
  • Preparation method of high-nickel positive electrode material of lithium secondary battery
  • Preparation method of high-nickel positive electrode material of lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Preparation of Li 0.2 Ni0.8 co 0.1 mn 0.1 o 2 Oxide

[0035] Lithium carbonate, nano manganese dioxide and Ni 0.8 co 0.1 (OH) 2 Mixing was carried out in a molar ratio of 0.1:0.1:1. The mixed raw materials were heated from room temperature to 350°C at a heating rate of 2°C / min in an air atmosphere, and then heated to 950°C for 5 hours after holding for 3 hours, and then cooled naturally to room temperature to obtain doped Li 0.2 Ni 0.8 co 0.1 mn 0.1 o 2 Oxide intermediates with a median particle size of about 10 μm.

[0036] 2) Preparation of LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material

[0037] Lithium hydroxide and the oxide intermediate obtained in step 1 were mixed according to a molar ratio of 0.8:1. After the mixed powder was calcined in oxygen at 750 °C for 10 h, LiNi 0.8 co 0.1 mn 0.1 o 2 Lithium-containing oxides, with a median particle size of about 11 μm, such as figure 1 shown.

[0038] Using N-methylpyrrolidone as a solvent, stir th...

Embodiment 2

[0040] 1) Preparation of Li 0.3 Ni 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Oxide

[0041] Lithium nitrate, nano zirconium dioxide and Ni 0.8 co 0.1 mn 0.095 (OH) 2 Mixing was carried out in a molar ratio of 0.3:0.005:1. The mixed raw materials were heated from room temperature to 350 °C at a heating rate of 1 °C / min in an air atmosphere, and then heated to 1000 °C for 5 h after holding for 3 hours, and then naturally cooled to room temperature to obtain doped Li 0.3 Ni 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Oxide intermediates, with a median particle size of about 8.5 μm.

[0042] 2) Preparation of LiNi 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Cathode material

[0043] Lithium hydroxide and the oxide intermediate product obtained in step 1 were mixed according to a molar ratio of 0.7:1. After the mixed powder was calcined in oxygen at 850 °C for 10 h, LiNi 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Lithium-containing oxide with a median particle size of about 9.5 μm.

[0044] Usi...

Embodiment 3

[0046] 1) Preparation of Li 0.01 Ni 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Oxide

[0047] Lithium hydroxide, nano zirconium dioxide and Ni 0.8 co 0.1 mn 0.095 (OH) 2 Mixing was carried out in a molar ratio of 0.01:0.005:1. The mixed raw materials were heated from room temperature to 350 °C at a heating rate of 3 °C / min in an air atmosphere, and then heated to 1000 °C for 5 h after holding for 3 hours, and then naturally cooled to room temperature to obtain doped Li 0.01 Ni 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Oxide intermediates, with a median particle size of about 9 μm.

[0048] 2) Preparation of LiNi 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Cathode material

[0049] Lithium hydroxide and the oxide intermediate product obtained in step 1 were mixed according to a molar ratio of 0.99:1. After the mixed powder was calcined in oxygen at 820 °C for 10 h, LiNi 0.8 co 0.1 mn 0.095 Zr 0.005 o 2 Lithium-containing oxide with a median particle size of about 10 μm.

[0050] ...

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Abstract

The invention discloses a preparation method of a high-nickel positive electrode material of a lithium secondary battery, the preparation process is improved and optimized, a high-nickel ternary material doped with effective elements can be obtained, the specific capacity cycle life of the material is effectively prolonged on the premise that the layered structure of the material is kept complete,excessive Li / Ni mixed arrangement and reduction of nickel ions are avoided, the sintering atmosphere is not limited and can be any one or a combination of air, oxygen or nitrogen, and the productionprocess is more flexible. The invention further discloses a high-nickel positive electrode material of the lithium secondary battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a high-nickel positive electrode material for a lithium secondary battery. Background technique [0002] Compared with other secondary battery systems, lithium-ion batteries have been widely used in digital electronic products such as notebooks and mobile phones due to their advantages such as high energy density, small self-discharge, and long cycle life. Although as early as 1873, the British Robert Davidson first used iron-zinc batteries to manufacture the first electric tricycle on the basis of a carriage, but because the early batteries were too bulky, the energy density and cycle life could not meet the requirements. With the Tesla Model S pure electric passenger car officially delivered to consumers in 2012, especially the increasingly serious environmental pollution and the fluctuation of oil prices in recent years, the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 申兰耀沈伟王胜彬于永利赵彬涛卢曦蒋宁周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD
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