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
CN102593445AActive Publication Date: 2012-07-18HUNAN SHANSHAN ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN SHANSHAN ENERGY TECH CO LTD
Publication Date
2012-07-18

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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.
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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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