Three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material and preparation method thereof

A composite lithium manganese oxide, three-dimensional porous technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the difficult large-scale industrial production of nano-carbon coated lithium manganate composite materials, time-consuming, complicated process, etc. problems, achieve excellent high-temperature cycle performance, ease volume change, and excellent rate performance

Inactive Publication Date: 2014-07-02
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

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  • Three-dimensional porous nanocarbon composite lithium manganate 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...

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Application Information

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IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/122H01M4/366H01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 李朝晖张红来肖启振雷钢铁
Owner XIANGTAN UNIV
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