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Lithium ion battery positive electrode material with adjustable crystalline grain size and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of undescribed grain size, better cycle performance, and increased discharge capacity, and achieve excellent room temperature and high temperature Cyclic performance, easy industrial production, and simple preparation process

Inactive Publication Date: 2015-12-02
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiQinWang et al. (Journal of Power Sources 162 (2006) 1367–1372) reported Mo-doped LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 material, it was found that the discharge capacity of the material at room temperature increased after doping, and the cycle performance became better. At the same time, it was observed that as the sintering temperature increased, the grain size of the material became larger; but how Mo doping affects the grain size has not been seen. describe
Therefore, these doping improvement works focus on improving the electrical properties of the nickel-cobalt-manganese ternary material by improving its crystal structure, but pay less attention to the morphology of the material, especially the change of the grain size, and have not proposed an element Method of Doping to Adjust the Grain Size of Materials

Method used

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  • Lithium ion battery positive electrode material with adjustable crystalline grain size and preparation method thereof
  • Lithium ion battery positive electrode material with adjustable crystalline grain size and preparation method thereof
  • Lithium ion battery positive electrode material with adjustable crystalline grain size and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] 91.1 g of precursor Ni with a median particle size of 8 μm 0.5 co 0.20 mn 0.3 (OH) 2 Mix with 36.8g lithium carbonate, 0.2gMgO ball mill, put above-mentioned material in sintering furnace after mixing and sinter at 920 ℃ for 5 hours, the sintered material passes through 200 mesh sieve after crushing, obtains Li(Ni 0.5 co 0.20 mn 0.3 ) 0.995 Mg 0.005 o 2 . The primary particle size of the obtained positive electrode material is 0.5-0.8 μm, the median particle size of the secondary particle is 8.6 μm, and the BET is 0.6 m 2 / g.

Embodiment 2

[0029] 90.2 g of precursor Ni with a median particle size of 10 μm 0.5 co 0.2 mn 0.3 (OH) 2 With 36.3g lithium carbonate, 0.174gB 2 o 3 , 1g of lithium acetate ball milling and mixing, after the mixing is completed, the above materials are placed in a sintering furnace and sintered at 900°C for 15 hours, and the sintered materials are crushed and passed through a 200-mesh sieve to obtain Li(Ni 0.5 co 0.20 mn 0.3 ) 0.98 Li 0.015 B 0.005 o 2 . The primary particle size of the obtained positive electrode material is 0.5-0.8 μm, the median particle size of the secondary particle is 9.8 μm, and the BET is 0.5 m 2 / g.

[0030] The SEM of the above positive electrode materials is shown in figure 1 .

Embodiment 3

[0032] 91.0 g of precursor Ni with a median particle size of 5 μm 0.80 co 0.10 mn 0.10 (OH) 2 With 37g lithium carbonate, 0.66gNb 2 o 5 Mix by ball milling. After mixing, place the above materials in a sintering furnace under an oxygen atmosphere and sinter at 750°C for 25 hours. The sintered materials are crushed and passed through a 200-mesh sieve to obtain LiNi 0.796 co 0.0995 mn 0.0995 Nb 0.005 o 2 . The primary particle size of the obtained positive electrode material is 0.1-0.3 μm, the median particle size of the secondary particle is 6.0 μm, and the BET is 0.7 m 2 / g.

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Abstract

The invention discloses a lithium ion battery positive electrode material with an adjustable crystalline grain size and a preparation method thereof as well as a lithium ion battery containing the positive electrode material. The crystalline grain size of the positive electrode material can be adjusted more conveniently by selecting proper doping ions through a certain preparation technology; the lithium ion battery containing the positive electrode material is excellent in normal-temperature and high-temperature circulating performance by adjusting the crystalline grain size of the positive electrode material, so that the aim that the lithium ion battery can be applied to different application fields is fulfilled. The preparation technology for the positive electrode material is simple and convenient and is favorable for industrial production. The lithium ion battery adopting the positive electrode material provided by the invention is high in circulating performance.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material with adjustable crystal grain size, a preparation method thereof, and a lithium ion battery containing the material, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery is the rechargeable battery system with the best comprehensive performance, the most widely used and the best market prospect. Since the beginning of the 21st century, with the rapid rise and rapid development of 3C products such as computers and consumer electronics, lithium-ion batteries have rapidly entered every corner of people's modern lives, providing mobile energy supplies for various products. Nickel-cobalt-manganese ternary materials are a class of cathode materials for lithium-ion batteries with broad application prospects. This type of material has high specific capacity, good cycle performance, excellent safety performance, simple synthesis process, and ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 黄震雷余随淅苏乔周恒辉杨新河
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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