Sodium ion battery electrode material, electrode and battery

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of difficulty in finding and deintercalating sodium ions, difficulty in selecting electrode materials, and low sodium storage capacity of graphite. Reversible capacity, environmental friendliness, simple preparation effect

Active Publication Date: 2019-05-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Na-ion batteries have a similar working principle to lithium-ion batteries, but the larger radius of sodium ions makes the selection of electrode materials particularly difficult.
At present, it is difficult to find a matrix material that can quickly, stably and commercially deintercalate sodium ions
For example, graphite has excellent lithium storage performance, but the larger sodium ions do not match the interlayer spacing of graphite, and cannot effectively reversibly deintercalate between graphite layers, resulting in a very low sodium storage capacity of graphite, about 30mAh / g

Method used

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  • Sodium ion battery electrode material, electrode and battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0053] Carbon molecular sieve one (effective pore diameter is 0.35nm, specific surface area is 5m 2 / g, pore volume 0.013cm 3 / g), and polyvinylidene fluoride after oven drying at 60°C, fully grind evenly according to the ratio of 8:1, mix evenly under the action of solvent 1-methyl-2-pyrrolidone to form a viscous paste, fully stir for 6h After coating the film, the current collector is carbon-coated copper foil. After the above electrode sheet was fully dried in an oven at 120° C. for 12 hours, a negative electrode sheet with a diameter of 14 mm was prepared. The negative electrode sheet and electrolyte (1mol / L NaClO 4 , 1:1 ethyl carbonate and diethyl carbonate), glass fibers, and sodium sheets are assembled into a sodium-ion battery.

Embodiment 2

[0055] Carbon molecular sieve II (effective pore diameter is 0.40m, specific surface area is 16m 2 / g, pore volume 0.015cm 3 / g), with conductive carbon black and polyvinylidene fluoride at 60 ° C, after drying in an oven, fully grind evenly according to the ratio of 8:1:1, and mix evenly under the action of solvent 1-methyl-2-pyrrolidone to become viscous It is in the form of a paste, and after being fully stirred for 6 hours, it is coated on the current collector, which is a carbon-coated copper foil. After the above-mentioned electrode sheet was fully dried in an oven at 120° C. for 12 hours, it was punched into a negative electrode sheet with a diameter of 14 mm. The negative electrode sheet and electrolyte (1mol / L NaClO 4 , 1:1 ethyl carbonate and diethyl carbonate), glass fibers, and sodium sheets are assembled into a sodium-ion battery.

Embodiment 3

[0057] Carbon molecular sieve three (effective pore diameter is 0.6nm, specific surface area is 36m 2 / g, pore volume 0.15cm 3 / g), with conductive carbon black and polyvinylidene fluoride at 60 ° C, after drying in an oven, fully grind evenly according to the ratio of 8:1:1, and mix evenly under the action of solvent 1-methyl-2-pyrrolidone to become viscous It is in the form of a paste, and after being fully stirred for 6 hours, it is coated on the current collector, which is a carbon-coated copper foil. After the above-mentioned electrode sheet was fully dried in an oven at 120° C. for 12 hours, it was punched into a negative electrode sheet with a diameter of 14 mm. The negative electrode sheet and electrolyte (1mol / L NaClO 4 , 1:1 ethyl carbonate and diethyl carbonate), glass fibers, and sodium sheets are assembled into a sodium-ion battery.

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Abstract

The invention provides a sodium-ion battery electrode material. The sodium-ion battery electrode material is a conductive porous material, containing holes are formed in the conductive porous material, the effective aperture of the containing holes ranges from 0.2 nm to 50 nm, the specific surface area of the containing holes ranges from 0.5 m<2> / g to 2,500 m<2> / g, the hole volume of the containing holes ranges from 0.0102 cm<3> / g to 1.8 cm<3> / g, and the hole depth of the containing holes ranges from 0.2 nm to 5 nm. The invention further provides an electrode and battery prepared from the electrode material. The electrode material is provided with a good sodium ion disembedding channel, groups of sodium ions and a solvent cannot enter the holes, and the battery achieves high reversible capacity and good rate capability.

Description

technical field [0001] The invention relates to a battery electrode material, in particular to a sodium ion battery electrode material, an electrode and a battery. Background technique [0002] With the rapid expansion of lithium-ion battery applications from portable electronic devices to electric vehicles and large-scale energy storage, the demand for lithium continues to increase, but limited lithium resources and high prices limit its use in smart grids and sustainable energy storage. Application of large-scale energy storage systems such as renewable energy. [0003] Sodium-ion battery is a battery system similar to lithium-ion battery. It uses sodium metal, which is more abundant in resources, and has the outstanding advantages of low cost and good performance. It is generally believed that it will be widely used in the fields of power batteries, large-scale energy storage devices, and smart grids. Applications. Na-ion batteries have a similar working principle to li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M10/05
CPCH01M4/587H01M10/05Y02E60/10
Inventor 杨全红张思伟康飞宇游从辉吕伟李宝华贺艳兵
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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