Composite lithium-rich anode material, its preparation method and its application

A lithium-rich material and mixed solution technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as limiting competitive advantages and wide applications, low stability and poor cyclability of lithium-rich materials

Inactive Publication Date: 2011-11-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported lithium-rich materials have low stability and poor cycl

Method used

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  • Composite lithium-rich anode material, its preparation method and its application
  • Composite lithium-rich anode material, its preparation method and its application
  • Composite lithium-rich anode material, its preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, preparation Li[Li 1-x-y-z mn x co y Ni z ]O 2 Lithium-containing materials shown (x=0.5, y=z=0.2)

[0027] 1) According to the molecular formula Li[Li 0.1 mn 0.5 co 0.2 Ni 0.2 ]O 2 Mn(CH 3 COO) 2 , Co(CH 3 COO) 2 , Ni(CH 3 COO) 2 The mixed aqueous solution, the cation concentration is 0.2mol / L;

[0028] 2) Add the mixed solution and 10mol / L LiOH solution dropwise into the reaction vessel, control the pH value of the system at about 10.5, and heat the water bath to 60°C. After the reaction is completed, filter, wash, and dry for 8 hours in a vacuum oven at 100°C with a vacuum degree of -85KPa to obtain the precursor [Mn 0.56 co 0.22 Ni 0.22 ](OH) 2 ;

[0029] 3) Combine the precursor with LiOH·H 2 O according to the molecular formula Li[Li 0.1 mn 0.5 co 0.2 Ni 0.2 ]O 2 After the proportions in the mixture are uniformly mixed, pre-sintering is carried out at 450°C for 6h in an air atmosphere, and then calcined at 900°C for 12h to ob...

Embodiment 2

[0032] Embodiment 2, preparation Li[Li 1-x-y-z mn x co y Ni z ]O 2 The shown lithium-containing materials (x=0.5, y=z=0.2) and the corresponding composite lithium-rich cathode materials

[0033] 1) According to the molecular formula Li[Li 0.1 mn 0.5 co 0.2 Ni 0.2 ]O 2 Mn(CH 3 COO) 2 , Co(CH 3 COO) 2 , Ni(CH 3 COO) 2 The mixed aqueous solution, the cation concentration is 0.2mol / L;

[0034] 2) Add the mixed solution and 10mol / L LiOH aqueous solution dropwise into the reaction vessel, control the pH value of the system at about 10.5, and heat the water bath to 60°C. After reacting for 12 hours, filter, wash, and dry for 8 hours in a vacuum oven at 100°C with a vacuum degree of -85KPa to obtain the precursor [Mn 0.56 co 0.22 Ni 0.22 ](OH) 2 ;

[0035] 3) Combine the precursor with LiOH·H 2 O according to the molecular formula Li[Li 0.1 mn 0.5 co 0.2 Ni 0.2 ]O 2 After the proportions in the mixture are uniformly mixed, pre-sintering is carried out at 450°...

Embodiment 3

[0041] Embodiment 3, preparation Li[Li 1-x-y-z mn x co y Ni z ]O 2The shown lithium-containing materials (x=0.6, y=z=0.1) and the corresponding composite lithium-rich cathode materials

[0042] 1) According to the molecular formula Li[Li 0.2 mn 0.6 co 0.1 Ni 0.1 ]O 2 Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Ni(NO 3 ) 2 mixed ethanol solution with a cation concentration of 0.5mol / L;

[0043] 2) Add the mixed solution and 5mol / L KOH aqueous solution dropwise into the reaction vessel, control the pH value of the system at about 12, and heat the water bath to 70°C. After reacting for 5 hours, filter, wash, and dry in a vacuum oven at 90°C with a vacuum degree of -95KPa for 10 hours to obtain the precursor [Mn 0.75 co 0.125 Ni 0.125 ](OH) 2 ;

[0044] 3) Combine the precursor with CH 3 COOLi according to the molecular formula Li[Li 0.2 mn 0.6 co 0.1 Ni 0.1 ]O 2 After the proportions in the mixture are uniformly mixed, pre-sintering is carried out at 400° C. for 8 hours...

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Abstract

The invention discloses a composite lithium-rich anode material of a lithium battery, its preparation method and its application. According to the invention, the surface modified lithium-rich material comprises a metal salt of a coating layer (M' denotes Mo, Zn, Ti, V, W) and a main phase Li[Li1-x-y-zMnxCoyNiz] O2 (0.1<=y=z<x<=2/3), wherein the mass ratio of the two is 0-50%. The preparation method comprises the following steps: dissolving the obtained Li [Li1-x-y-zMnxCoyNiz]O2 (0.1<=y=z<x<=2/3) lithium-rich material in a transition metal salt solution of 0.02-10g/L, well mixing and drying the solution under the temperature of 50 - 150 DEG C, and then calcining under the temperature of 200 DEG C - 800 DEG C for 2 - 12 hours to obtain the surface modified Li [Li1-x-y-zMnxCoyNiz]O2 (0.1<=y=z<x<=2/3) lithium ion battery anode materials. The present invention reduces initial irreversible capacity loss of the lithium-rich material, and is capable of greatly improving the multiplying power performance and the cycle performance, as well as meeting the requirement of the high-power lithium ion battery.

Description

technical field [0001] The invention belongs to the field of positive electrode materials and electrochemistry of lithium ion batteries, and relates to a composite lithium-rich positive electrode material and a preparation method and application thereof. Background technique [0002] As a secondary green battery, lithium-ion batteries have been widely used in many fields such as portable electronic devices, and have begun to expand the market for large-capacity batteries such as electric vehicles. As far as the current situation is concerned, the research on anode materials for lithium-ion batteries is relatively lagging behind compared with anode materials. Both in theory and in practical applications, the theoretical capacity of anode materials used is lower than that of anode materials. And the marketization of electric vehicles brings certain difficulties. Therefore, extensive and in-depth research on cathode materials has become the key to the development of high-perfo...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 郭玉国苏婧吴兴隆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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