Multi-metal composite oxide coated modified lithium manganate positive electrode material and preparation method thereof

A technology of composite oxides and lithium manganate, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., can solve the problems of inability to have both capacity and cycle performance, high-temperature cycle performance cannot be effectively improved, and capacity drops rapidly, etc. problems, to achieve the effect of outstanding cycle performance, good protection, and improved capacity and energy density

Inactive Publication Date: 2021-11-02
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, according to the current literature reports, lithium manganese oxide materials on the market generally cannot have good capacity and cycle performance, especially the high-temperature cycle performance cannot be effectively improved, and its capacity will drop rapidly under high temperature conditions.

Method used

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  • Multi-metal composite oxide coated modified lithium manganate positive electrode material and preparation method thereof
  • Multi-metal composite oxide coated modified lithium manganate positive electrode material and preparation method thereof
  • Multi-metal composite oxide coated modified lithium manganate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of multi-metal composite oxide coating modified lithium manganate cathode material of the present invention is based on Li 1.075 mn1.845 Al 0.08 o 4 As the matrix, the surface of the matrix is ​​coated with Li(Mn) 0.83 (Al) 0.027 o 2 cladding.

[0034] The preparation method of the modified lithium manganate cathode material of the present embodiment comprises the following steps:

[0035] (1) Press Li 1.075 mn 1.845 Al 0.08 o 4 Design ratio, after calculation, 10kg manganese source raw material MnO 2 , 2.37kg battery grade lithium carbonate, 371.8g dopant aluminum hydroxide, join in the high-speed mixer, 500rpm mixes 5min, then 1500rpm mixes 20min, after the mixing is completed, there is no white spot visually, and the mixture is obtained;

[0036] (2) Using a box-type atmosphere furnace, put the mixture obtained in step (1) into a sagger, loosely pack and level the surface of the mouth of the bowl and scrape it flat, put it into the sintering equipmen...

Embodiment 2

[0054] A kind of multi-metal composite oxide coating modified lithium manganate cathode material of the present invention is based on Li 1.075 mn 1.865 Mg 0.06 o 4 As the matrix, the surface of the matrix is ​​coated with Li(Co) 0.55 (Al) 0.03 o 2 cladding.

[0055] The preparation method of the modified lithium manganate cathode material of the present embodiment comprises the following steps:

[0056] (1) Press Li 1.075 mn 1.865 Mg 0.06 o 4 Design ratio, after calculation, weigh 10kg manganese source raw material MnO 2 , battery grade lithium carbonate 2.34kg, dopant magnesia 142.5g, join in the high-speed mixer of mixing equipment, first mix 5min with 500rpm, then mix with 1500rpm for 20min, after the mixing is completed, there is no white spot visually, and the mixture is obtained ;

[0057] (2) heating the mixture after step (1) to 940° C., and sintering at a constant temperature for 12 hours;

[0058] (3) Roll the material after step (2), then use ACM crushi...

Embodiment 3

[0063] A kind of multi-metal composite oxide coating modified lithium manganate cathode material of the present invention is based on Li 1.045 mn 1.915 Ti 0.04 o 4 As the matrix, the surface of the matrix is ​​coated with Li(Ni) 0.73 (Zr) 0.011 o 2 cladding.

[0064] The preparation method of the modified lithium manganate cathode material of the present embodiment comprises the following steps:

[0065] (1) Press Li 1.045 mn 1.915 Ti 0.04 o 4 Design ratio, calculated 10kg manganese source raw material MnO 2 , corresponding to 2.26kg of battery-grade lithium carbonate and 187.3g of dopant titanium oxide, cross-feeding is added to the high-speed mixer of the mixing equipment, first mixed at 500rpm for 5min, and then mixed at 1500rpm for 20min. After the mixing is completed, there is no white spot by visual inspection. got the mixture;

[0066] (2) The mixture after step (1) was sintered at a constant temperature of 930° C. for 12 hours, and cooled;

[0067] (3) Rol...

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Abstract

A multi-metal composite oxide coated modified lithium manganate positive electrode material takes lithium manganate as a matrix, wherein the surface of the matrix is coated with a Li(M1)beta(M2)gammaO2 coating layer, beta is larger than 0 and smaller than or equal to 1, gamma is larger than 0 and smaller than or equal to 0.5, and M1 is at least one of Mn, Co and Ni; and M2 is at least one of Al, Mg, Zr, Ti, Sr, Y, W, Bi, La, Sd, Ba, Ce, V, Se, Mo, Nb and B. The preparation method comprises the following steps of: mixing the raw materials according to a stoichiometric ratio for preparing a lithium manganate matrix, and calcining the mixture at the temperature not lower than 900 DEG C to obtain a first calcined product; and mixing the calcined product with a M1-containing compound and a M2-containing compound, and calcining to obtain the multi-metal composite oxide coated modified lithium manganate positive electrode material. The modified lithium manganate positive electrode material disclosed by the invention not only has long cycle life, especially has relatively outstanding cycle performance under a high-temperature condition, but also has a high capacity level.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a multimetal composite oxide-coated modified lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] Lithium manganese oxide material has a natural low cost advantage, but it also has the disadvantages of low battery capacity and poor high temperature cycle. In order to reduce the performance gap between lithium manganese oxide materials and ternary materials in terms of capacity and cycle, lithium manganate materials need to be improved in energy density and high temperature performance. How to ensure that the high-temperature cycle performance of the lithium manganese oxide material can be effectively improved under the premise of high capacity is one of the key difficulties in the existing technology. [0003] The performance defects of lithium manganate are mainly caused by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62H01M10/0525C01G45/00
CPCH01M4/505H01M4/62H01M10/0525C01G45/006C01P2006/40C01P2002/72C01P2004/03C01P2004/61C01G45/00Y02E60/10
Inventor 李娟朱孔磊王福日归伊娜
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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