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Core-shell-structure lithium manganate capable of improving high temperature resistance performance, and synthesis method of core-shell-structure lithium manganate

A structural lithium manganate, high temperature resistant technology, used in structural parts, electrical components, electrochemical generators, etc.

Active Publication Date: 2015-09-30
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the use of ternary material LiNi 1-a-b co a mn b o 2 or LiNi 1-c-d co c Al d o 2 And high voltage material LiNi 0.5 mn 1.5 o 4 or LiCo 0.5 mn 1.5 o 4 There is no report on the formation of core-shell composites coated with lithium manganese oxide

Method used

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  • Core-shell-structure lithium manganate capable of improving high temperature resistance performance, and synthesis method of core-shell-structure lithium manganate
  • Core-shell-structure lithium manganate capable of improving high temperature resistance performance, and synthesis method of core-shell-structure lithium manganate
  • Core-shell-structure lithium manganate capable of improving high temperature resistance performance, and synthesis method of core-shell-structure lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Mix 100mL of deionized water with 20mL of 25% ammonia water, and add 2mol / L NaOH solution dropwise to it until the pH value is 10.0±0.3, and use this mixed solution as the base solution. 70.11g spherical Mn 3 o 4 Add (the Mn content is 70.52wt%) into the above bottom liquid, use 2mol / L NaOH solution as precipitant to control the pH value to 10.0±0.3, the stirring speed is 800 rpm, and the water bath temperature is 50°C. Under the condition of blowing nitrogen, 1mol / L NiSO was added dropwise 4 , 1mol / L CoSO 4 and 1mol / L MnSO 4 50.1 mL of mixed solution consisting of 16.7 mL each. After the addition is complete, continue to drop the above-mentioned NaOH solution to keep the pH value of the solution at 10.0±0.3, and continue to stir for 0.5h. Wash the precipitate 3 times with 100 mL deionized water, filter and dry to obtain the Mn coated with nickel hydroxide cobalt manganese 3 o 4 Composite material.

[0033] The content of Ni, Co and Mn in the material obtained ab...

Embodiment 2

[0038] Mix 100mL deionized water and 20mL ammonia water with a concentration of 36%, and add 2mol / L NaOH solution dropwise to it until the pH value is 9.30±0.3, and use this mixed solution as the base solution. 70.11g spherical Mn 3 o 4 Add (Mn content is 70.52wt%) into the above bottom liquid, use 2mol / L NaOH solution as a precipitant to control the pH value to 9.30±0.3, the stirring speed is 800 rpm, and the water bath temperature is 50°C. Under the condition of blowing nitrogen, 1mol / L NiSO was added dropwise 4 and 1mol / L CoSO 4 Each 16.7mL solution and 1mol / L Al 2 (SO 4 ) 3 41.8mL mixed solution composed of 8.4mL solution, after the addition is completed, continue to add NaOH dropwise, so that the pH value of the solution remains at 9.30±0.3, and continue to stir for 0.5h. The precipitate was washed 3 times with 100 mL of deionized water, filtered and dried to obtain Mn coated with nickel hydroxide cobalt aluminum 3 o 4 Composite material.

[0039] The content of ...

Embodiment 3

[0044] Mix 100mL of deionized water with 20mL of 36% ammonia water, and add 2mol / L NaOH solution dropwise to it until the pH value is 10.0±0.3, and use this mixed solution as the base solution. 70.11g spherical Mn 3 o 4 Add (the Mn content is 70.52wt%) into the above bottom liquid, control the pH value to 10.0±0.3, the stirring speed is 800 rpm, and the water bath temperature is 50°C. Under the condition of blowing nitrogen gas, 25 mL of NiSO with a concentration of 1 mol / L was added dropwise 4 solution and 75mL of MnSO with a concentration of 1mol / L 4 While the solution was composed of 100mL mixed solution, 2mol / L NaOH solution was added dropwise. To be the above NiSO 4 and MnSO 4 After adding the mixed solution, continue to add NaOH solution dropwise to keep the pH value at 10.0±0.3, and continue to stir for 0.5h. Wash the precipitate 3 times with 100mL deionized water, filter and dry to obtain the nickel hydroxide-coated Mn 3 o 4 Composite material.

[0045] The co...

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Abstract

The invention provides core-shell-structure lithium manganate capable of improving the high temperature resistance performance, and a synthesis method of the core-shell-structure lithium manganate, and provides a lithium manganate compounding material which is relatively high in capacity and high in high temperature cycle performance. The compounding material is a core-shell-structure lithium manganate positive material of a lithium ion battery and is expressed as LixMn2O4.yA (wherein x is more than or equal to 1 and less than or equal to 1.3, and y is more than 0 and less than or equal to 0.1); the shell A is made from a lithium ion battery positive material having the electrochemical activity and the high temperature resistance performance and can be expressed as one of LiNi0.5Mn1.5O4, LiCo0.5Mn1.5O4, LiNi(1-a-b)CoaMnbO2(wherein a is more than 0 and is less than 1.0, and the b is more than 0 and less than 1.0), and LiNi(1-c-d)CocAldO2(wherein c is more than 0 and less than 1.0, and d is more than 0 and less than 1.0); and the core part is made from a material expressed as LixMn2O4. The specific surface area of the compounding material is 0.2-1.2m<2> / g, and D50 is 7-18mu m.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a coated lithium manganate positive electrode material and a preparation method thereof; the important thing is that the coated lithium manganate forms a core-shell structure, and its The shell part is composed of three or four positive electrode materials forming metal oxides among nickel, cobalt, aluminum, manganese and lithium, while the central core part is composed of lithium manganate. Background technique [0002] Lithium-ion battery is a new type of green secondary battery widely used at present and for a long time to come. Compared with the previous lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, it has a series of advantages. It occupies a relatively important position in the national economy and social life. In particular, the national 12th Five-Year Plan regards electric vehicles as the key support and devel...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/36H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孙春胜江卫军张溪苏迎春崔妍李化一朱晓沛庞自钊白珍辉
Owner 北京盟固利新材料科技有限公司
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