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Aluminum clad manganese-base laminated composite lithium ion battery cathode material and preparation method thereof

A positive electrode material and ion battery technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of uncoated treatment, high initial charge voltage platform, and low charge and discharge efficiency, so as to improve the initial charge and discharge efficiency, The effect of the first charging voltage platform is low and the capacity is high

Active Publication Date: 2012-07-18
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent document, the secondary sintering process is used, and the components are limited, but no cladding treatment is involved
[0005] Existing manganese-based layered cathode materials have the disadvantages of high first charge voltage plateau and low charge and discharge efficiency

Method used

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  • Aluminum clad manganese-base laminated composite lithium ion battery cathode material and preparation method thereof
  • Aluminum clad manganese-base laminated composite lithium ion battery cathode material and preparation method thereof
  • Aluminum clad manganese-base laminated composite lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0028] The anode material of the aluminum-coated manganese-based layered composite lithium-ion battery of the present embodiment is Li(Li 0.2 mn 0.65 Ni 0.33 al 0.02 )O 2 The layered structure of the manganese-based cathode material is coated with aluminum salt; the coating amount is Al / Li(Li 0.2 mn 0.65 Ni 0.33 al 0.02 )O 2 The mass ratio is 0.02%.

[0029] Its preparation method is:

[0030] (1) Prepare the mixture: according to the molecular formula, it is Li(Li 0.2 mn 0.65 Ni 0.33 al 0.02 )O 2 Ratio, the molar ratio is Mn:Ni=0.65:0.33 hydroxide precursor nickel manganese hydroxide 10.000Kg and 35.979kg purity is lithium carbonate (Li 2 CO 3 ), 3.119kg of micron grade Al with a purity of 99% 2 o 3 , added to the mixing tank, mixed evenly, and the elemental composition was Li(Li 0.2 mn 0.65 Ni 0.33 al 0.02 )O 2 mixture;

[0031] (2) Sintering and grinding: At 900°C, the elemental composition obtained in step (1) is Li(Li 0.2 mn 0.65 Ni 0.33 al 0.0...

Embodiment 2-4

[0045] The differences between Examples 2-4 and Example 1 are listed in Table 1, and other operations are the same as Example 1.

[0046]

[0047] Table 1 Uncoated and Al-coated manganese-based layered cathode materials synthesized under different conditions

[0048] Example components Substance used for coating Coated Al mass percentage (%) First discharge capacity (mAh / g) First charge and discharge efficiency (%) 30-week cycle retention rate (%) 2 Li(Li 0.2 mn 0.65 Fe 0.30 Al 0.05 )O 2 Aluminum nitrate, ammonia water 0.02 228.5 69.8 97.4 2 Comparative example Li(Li 0.2 mn 0.65 Fe 0.30 al 0.05 )O 2 - - 235.1 64.0 93.7 3 Li(Li 0.2 mn 0.60 co 0.38 Mg 0.02 )O 2 Aluminum nitrate, ammonium fluoride 0.05 246.7 81.6 98.6 3 Comparative example Li(Li 0.2 mn 0.60 co 0.38 Mg 0.02 )O 2 - - 250.6 73.2 94.5 4 Li(Li 0.2 mn 0.648 Ni 0.228 co 0.114 Ti 0.01 )O 2 Aluminum...

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Abstract

The invention discloses an aluminum clad manganese-base laminated composite lithium ion battery cathode material and a preparation method thereof. According to the anode material, aluminum salt is coated on an outer surface of a manganese-base cathode material with a laminated structure in a chemical formula of Li(LixMn1-y-zM1yM2z)O2. The preparation method comprises the following steps of: (1) preparing a mixture; (2) sintering and treating powder; (3) preparing a corresponding amount of soluble aluminum salt, adding the soluble aluminum salt into the manganese-base laminated cathode material, and uniformly stirring; (4) preparing a NH3.H2O solution, a NH4F solution or a NH4H2PO4 solution, adding the solution into slurry of aluminum nitrate and the manganese-base laminated cathode material, and uniformly stirring; and (5) drying the slurry obtained in the step (4), and sintering at the temperature of between 400 and 800 DEG C for 5 to 15 hours. The aluminum clad manganese-base laminated composite lithium ion battery cathode material has high capacity, low first charging voltage platform and excellent long cycle performance, takes an Mn element as a basis, and is low in raw material cost and particularly suitable for preparing large batteries such as batteries of electric vehicles.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to an aluminum-coated manganese-based layered composite lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Currently widely used cathode materials for lithium-ion batteries include lithium cobalt oxide, spinel lithium manganese oxide, nickel-cobalt binary materials, nickel-cobalt-manganese ternary materials, and lithium iron phosphate; among them, lithium cobalt oxide has the best overall performance, and the preparation The process is mature, and it is the mainstream cathode material in the current market, but cobalt resources are scarce, and at the same time, it pollutes the environment. Spinel-type lithium manganese oxide is cheap and has excellent safety performance, but there is a Jahn-Teller effect, and it is also prone to Mn 3+ The disproportionation of manganese causes the dissolution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 唐朝辉王志兴彭文杰袁荣忠李娟
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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