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A kind of three-dimensional porous nano-carbon composite lithium manganese oxide spherical positive electrode material and preparation method thereof

A composite lithium manganese oxide, three-dimensional porous technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the complex process, time-consuming, difficult large-scale industrial production of nano-carbon-coated lithium manganate composite materials, etc. problems, achieve the effects of alleviating volume changes, controllable material morphology, and excellent high-temperature cycle performance

Inactive Publication Date: 2016-03-30
XIANGTAN UNIV
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Problems solved by technology

This process is not only time-consuming and complicated, but also needs to solve the two key technical problems of preventing the aggregation of nanoparticles and uniformly coating the surface of each nanoparticle, making it difficult to mass-produce nano-carbon-coated lithium manganate composite materials on a large scale.

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  • A kind of three-dimensional porous nano-carbon composite lithium manganese oxide spherical positive electrode material and preparation method thereof

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0021] The preparation method of the three-dimensional porous nano-carbon composite lithium manganese oxide spherical positive electrode material provided by the invention is as follows:

[0022] Step 1, first add 700 ml of n-heptane to a 2000 ml three-necked flask, then add 7.50 g of surfactant Span-80 and 0.75 g of surfactant Tween-80, stir evenly under nitrogen protection, and control the temperature of the water bath to 40 ° C. get the oily phase;

[0023] Add 50 ml of deionized water into a 100 ml beaker, and then add 9.60 g of acrylamide monomer to dissolve to obtain solution A. Weigh 0.85 g of NaOH solid and dissolve it in 10 ml of deionized water. After cooling in an ice-water bath, add 3.5 ml of acrylic acid monomer to NaOH solution dropwise to obtain solution ...

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Abstract

The invention discloses a three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material and a preparation method thereof. The preparation method comprises the following steps of adsorbing Mn<2+> ions onto a carbonyl (-COH-) group in a microgel three-dimensional macromolecular network by adopting poly(acrylamide, acrylic acid) microgel spheres as a template; increasing the pH value of the poly(acrylamide, acrylic acid) microgel spheres so as to in-situ hydrolyze the Mn<2+> ions to generate Mn(OH)2 crystal nucleus, depositing the Mn(OH)2 crystal nucleus into a space formed by the three-dimensional macromolecular network to form nano composite polymer microspheres; placing the obtained nano composite polymer microspheres into a tubular furnace to be calcined at a high temperature in an inert gas atmosphere to prepare the three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material. The positive electrode material has the advantages of excellent high-temperature cycling performance, large multiplying power charging-discharging performance and the like, and can be widely applied to the production of a lithium battery.

Description

technical field [0001] The invention relates to the preparation of a porous spherical lithium-ion battery cathode material and a method thereof, belonging to the technical field of chemical power sources. Background technique [0002] As a reusable secondary battery, lithium-ion battery has long life, safe use, fast charging and discharging with high current, high temperature resistance, large capacity, low self-discharge rate, no memory effect, high energy density, and green environmental protection. Since Sony commercialized lithium-ion batteries in 1990, lithium-ion batteries have been used as a successful secondary power source. [0003] The research on cathode materials for lithium-ion batteries is still an important factor restricting the powerization of lithium-ion batteries. The commercialized cathode materials include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Lithium cobalt oxide was first commercialized by SONY. However, due to fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/366H01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 李朝晖张红来肖启振雷钢铁
Owner XIANGTAN UNIV
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