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Graphite/manganous oxide composite electrode material and preparation method thereof

A manganese oxide composite material, composite electrode technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc. question

Inactive Publication Date: 2013-05-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although nanometerization can significantly improve the electrochemical performance of manganous oxide materials, such as the first coulombic efficiency as mentioned above, the performance of manganese oxide being easily oxidized prevents nano-manganous oxide from being stored in the air for a long time.

Method used

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  • Graphite/manganous oxide composite electrode material and preparation method thereof
  • Graphite/manganous oxide composite electrode material and preparation method thereof
  • Graphite/manganous oxide composite electrode material and preparation method thereof

Examples

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preparation example Construction

[0041] The invention relates to a graphite / manganous oxide composite electrode material with a core-shell structure and a preparation method thereof, belonging to the fields of inorganic nanometer electrochemistry and new energy. The composite material with core-shell structure is prepared by non-template step-by-step reduction self-assembly, and has a spherical shape. The core-shell structure composed of carbon completely coated manganese oxide nanospheres not only improves the oxidation resistance and electrical conductivity of manganous oxide, but also inhibits the growth of manganous oxide particles, so that it has a uniform particle size (~65nm). The composite material prepared by this method has superior comprehensive electrochemical properties: high actual specific capacity, good cycle stability and good rate performance, and the actual specific capacity can reach ~430mAh / g ( higher than the specific capacity of currently commercialized carbon electrode materials). The...

Embodiment 1

[0101] Slowly add a certain amount of 0.5M potassium permanganate (0.79g) solution into 100mL of glucose (1.8g) for dissolution, stir evenly with magnetic force, and sonicate until the solution turns from purple to brown gel-like solid; then place the brown gel in After drying in an oven at 150°C, grind it into powder; under the protection of nitrogen, the obtained solid powder was pretreated at 300°C for a period of time at a heating rate of 5°C / min, then reacted at a constant temperature of 700°C for 3 hours, and cooled naturally to At room temperature, gray-black graphite / manganese oxide powder is obtained.

Embodiment 2

[0105] Other conditions are the same as in Example 1, except that the calcining temperature is changed to 650°C. The electrochemical test method is the same as in Example 1.

[0106] The gray-black graphite / manganese oxide composite powder obtained according to Example 2 has a uniform particle size, and the particle size is slightly smaller (<60nm) than that of the sample in Example 1, and the carbon content is ~5.6%.

[0107] The initial Coulombic efficiency is 67% (~780mAh / g) at 50mAh / g current, the specific capacity retention rate is 88% after 50 cycles, and the specific capacity is ~420mAh / g at 1600mAh / g charge and discharge current.

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Abstract

The invention provides a graphite / manganous oxide composite electrode material. The composite electrode material is a graphite / manganous oxide composite electrode material with a nuclear shell structure; the nuclear shell is nanosphere, and the core of the nanosphere is manganous oxide with grain size less than 100nm; and the shell of the nanosphere is a graphite carbon layer with thickness less than 10nm. The invention also relates to a preparation method of the electrode material, a product of the electrode material, and application.

Description

technical field [0001] The invention relates to inorganic nanometer materials and belongs to the fields of electrochemistry and new energy materials. Background technique [0002] Lithium-ion batteries, with their small size, light weight, high specific energy, no memory effect, no pollution, long life and other advantages, have become a new generation of green high-energy rechargeable batteries that have attracted much attention. However, with the deepening of the global industrialization process, the lithium ion negative electrode material currently used in commercialization - the low lithium storage capacity of carbon (theoretical specific capacity is only 372mAh / g) has been difficult to adapt to portable instruments, electric vehicle power supplies, etc. Therefore, in order to meet the needs of actual production and life, it is imperative to develop new lithium-ion anode materials with higher specific capacity. [0003] Manganese-based oxides are rich in resources, and ...

Claims

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Application Information

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IPC IPC(8): H01M4/505B82Y30/00H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 余丽丽赵景泰杨昕昕陈昊鸿
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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