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Gradient-doping positive material of lithium ion battery and preparation method of gradient-doping positive material of lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited application scope, complex production process, and difficulty in mixing, etc., and achieves wide application scope, high discharge capacity, and cost. low cost effect

Active Publication Date: 2014-12-24
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

However, when the gradient material is prepared by precipitation reaction, the production process is complicated and difficult to control
Moreover, not all metal ions can find a suitable precipitation reaction, and it is difficult for some non-metallic elements such as B to mix with Ni elements by precipitation reaction.
Therefore, the scope of application of the above-mentioned gradient material preparation process is greatly limited.

Method used

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  • Gradient-doping positive material of lithium ion battery and preparation method of gradient-doping positive material of lithium ion battery
  • Gradient-doping positive material of lithium ion battery and preparation method of gradient-doping positive material of lithium ion battery
  • Gradient-doping positive material of lithium ion battery and preparation method of gradient-doping positive material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 92.8g precursor Ni 0.8 co 0.20 (OH) 2 Mix it with 35.2g of lithium carbonate by ball milling in a dry method. After the mixing is completed, place the above material in a sintering furnace and sinter at 700°C for 15 hours. The sintered material is crushed and passed through a 200-mesh sieve to obtain Li 0.95 Ni 0.80 co 0.20 o 2 .

[0038] (2) 81.7g C 4 h 6 MnO 4 .4H 2 O was added to deionized water and stirred to make a uniform solution, and the material to be doped in (1) was poured into the above solution, stirred for 2 hours, so that the material to be doped was fully impregnated in the manganese acetate solution, and then the mixed material was evaporated to dryness with stirring The moisture in the liquid forms the product Li covered with Mn element 0.95 Ni 0.80 co 0.20 o 2 .

[0039] (3) the above-mentioned Li covered with Mn element 0.95 Ni 0.80 co 0.20 o 2 Mix with 22.2g of lithium carbonate ball mill, after the mixing is completed, put the...

Embodiment 2

[0041] (1) 118.4g precursor Ni 0.80 co 0.10 mn 0.10 CO 3 Mix it with 37g of lithium carbonate by ball milling in a dry method. After the mixing is completed, put the above materials in a sintering furnace and sinter at 800°C for 12 hours. 0.80 co 0.10 mn 0.10 o 2 .

[0042] (2) Add 16.0g of aluminum isopropoxide to ethanol and stir to make a uniform solution, pour the material to be doped in (1) into the above solution, stir for 2 hours, and make the material to be doped in the aluminum isopropoxide solution Fully impregnated in the mixture, and then stirred and evaporated to dry the water in the mixture liquid to form the product LiNi coated with Al element 0.80 co 0.10 mn 0.10 o 2 .

[0043] (3) LiNi covered with Al element 0.80 co 0.10 mn 0.10 o 2 Mix it with 5.9g of lithium carbonate by ball milling in a dry method. After the mixing is completed, place the above material in a sintering furnace and sinter at 600°C for 5 hours. After the sintered material is c...

Embodiment 3

[0045] (1) Precursor 56.0gNiO, 21.7gMnO 2 Mix with 38.9g of lithium carbonate ball mill, after the mixing is completed, put the above material in a sintering furnace and sinter at 900°C for 10h, the sintered material is crushed and passed through a 200 mesh sieve to obtain the product to be doped LiNi 0.75 mn 0.25 o 2 .

[0046] (2) 72.8gCo(NO 3 ) 2 ·6H 2 O was added to deionized water and stirred to make a uniform solution, and the material to be doped in (1) was poured into the above solution, stirred for 2 hours, so that the material to be doped was fully impregnated in the cobalt nitrate solution, and then the mixed material was evaporated to dryness with stirring The moisture in the liquid forms the product LiNi coated with Co element 0.75 mn 0.25 o 2 .

[0047] (3) LiNi covered with Co element 0.75 mn 0.25 o 2 Mix it with 6.9g of lithium carbonate by ball milling in a dry method. After the mixing is completed, put the above material in a sintering furnace and...

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Abstract

The invention discloses a gradient-doping positive material of a lithium ion battery and a preparation method of the gradient-doping positive material of the lithium ion battery. The structural formula of the positive material is shown as Li(1+alpha)Ni(x)M(y)M'(1-x-y)O(2), wherein alpha is greater than or equal to 0 and less than or equal to 0.2; x is greater than or equal to 0.3 and less than or equal to 1.0; y is greater than or equal to 0 and less than or equal to 0.475; 1-x-y is greater than 0 and less than or equal to 0.35; the concentration of doping element M' is subjected to gradient change from the surfaces of the material particles; on the surfaces of the material particles, the concentration of the element M' is relatively high, the concentration of element Ni is relatively low, and even the surfaces of the material particles are free of the element Ni; in the material particles, the concentration of the element Ni is relatively high, the concentration of the element M' is relatively low, and even the inside of the material particles are free of the element M'. The positive material is excellent in comprehensive performance and especially has the advantages of high discharge capacity, excellent cycle performance and the like. In addition, the method is simple; the industrial production is easy to implement.

Description

technical field [0001] The invention relates to a gradient doped lithium ion battery positive electrode material and a preparation method thereof, belonging to the field of lithium ion battery electrode materials. Background technique [0002] In recent years, with the rapid rise and rapid development of 3C products such as computers and consumer electronics, the above-mentioned products have become an important part of modern people's lives and are inseparable from people's daily life. At the same time, the products derived from the above 3C products The market for secondary batteries has also reached a considerable scale, and the growth rate is getting faster and faster. Lithium-ion secondary batteries have become the most popular products used in the above-mentioned 3C products because of their outstanding advantages such as high operating voltage, high energy density, and portability. The most important secondary battery in the. Lithium-transition metal composite oxides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/131H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 黄震雷韩坤明尚怀芳苏乔左自成周恒辉杨新河
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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