A dual-ion battery

A dual-ion, battery technology, applied in the field of electrochemical energy storage, can solve the problems of difficult application, poor cycle performance, low conductivity, etc., to achieve the suppression of the generation of dendrites on the surface of the negative electrode, high voltage stability, and electrochemical The effect of window width

Active Publication Date: 2020-07-14
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiCoO 2 Although it is the earliest commercialized lithium-ion battery cathode material, the raw material cobalt is very expensive, and there are environmental pollution problems, and it is only suitable for small 3C electronic products, and its large-scale use is limited.
while LiNiO 2 , LiMnO 2 and Li x mn 2 o 4 The cycle performance of LiFePO is poor 4 Although there are many advantages, there are two fatal disadvantages: low conductivity and low tap density
Some studies use ionic liquids as electrolytes, which have high viscosity, low conductivity, and poor wettability on the electrode surface, so the rate performance and cycle stability are poor. At the same time, they are expensive. Therefore, it is difficult to use ionic liquids as electrolytes in practical systems. application

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of dual-ion battery provided by the present embodiment:

[0047] Configure 2mol / L electrolyte containing lithium hexafluorophosphate in the glove box, wherein the electrolyte is a mixed solvent of ethyl methyl carbonate, ethylene carbonate and vinylene carbonate, and the volume fraction of vinylene carbonate in the mixed solvent is 5 %. The above-mentioned configured electrolyte was placed in a glove box; a dual-ion battery was produced in the glove box, wherein the positive pole was commercial graphite, the negative pole was porous spherical MnO with a micro-nano structure, and the separator was a commercially available separator.

[0048] The above-mentioned porous spherical MnO with micro-nano structure is spherical MnCO prepared by carbonate co-precipitation method. 3 Calcined at 470 ° C for 5.5h in the system.

Embodiment 2

[0050] A kind of dual-ion battery provided by the present embodiment:

[0051] Configure 2mol / L electrolyte containing lithium hexafluorophosphate in the glove box, wherein the electrolyte is a mixed solvent of ethyl methyl carbonate, ethylene carbonate and vinylene carbonate, and the volume fraction of vinylene carbonate in the mixed solvent is 5 %. The above-mentioned configured electrolyte was placed in a glove box; a dual-ion battery was produced in the glove box, wherein the positive electrode was commercial graphite, the negative electrode was a metal Sn foil with a thickness of 0.1 mm, and the separator was a commercially available separator.

Embodiment 3

[0053] Configure 0.4mol / L electrolyte containing lithium tetrafluoroborate in the glove box, wherein the electrolyte is a mixed solvent of ethyl methyl carbonate and fluoroethylene carbonate, and the volume fraction of fluoroethylene carbonate in the mixed solvent is 10%. The above-mentioned configured electrolyte was placed in a glove box; a dual-ion battery was fabricated in the glove box, wherein the positive electrode was multilayer graphite oxide, the negative electrode was porous spherical MnO with a micro-nano structure, and the separator was a commercially available separator.

[0054] The above-mentioned porous spherical MnO with micro-nano structure is spherical MnCO prepared by carbonate co-precipitation method. 3 Calcined at 400 ° C for 7h in the system.

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Abstract

The invention provides a dual-ion battery, and relates to the technical field of electrochemical energy storage. The dual-ion battery comprises a positive electrode, a negative electrode, a separator and an electrolyte solution, wherein the separator is arranged between the positive electrode and the negative electrode, the positive electrode comprises a graphite positive electrode material, a negative electrode material is a MnO or metal Sn foil, and the electrolyte solution comprises an electrolyte, an organic solvent and an electrolyte additive. The graphite material is selected as the positive electrode material of the battery, the MnO or Sn foil which has activity on lithium ions is selected as the negative electrode material, and the dual-ion battery obtained by assembly is low in raw material cost, is green and environmental-friendly and has favorable rate performance and coulombic efficiency; a positive electrode platform is high in level, the dendritic crystal on a surface of the negative electrode during the repeated charge-discharge process of the battery is prevented, and the safety of the battery is greatly improved; and moreover, the electrolyte additive is added into the electrolyte solution of the dual-ion battery, the stability of the battery can be effectively improved, and the rate performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, and in particular to a dual-ion battery. Background technique [0002] With the rapid development of society and the extensive use of fossil fuels, the greenhouse effect of air pollution is becoming more and more serious. In addition, with the widespread use of chemical power sources in many fields such as portable electronic equipment, electric vehicles, medical treatment, military and aerospace technology, It is particularly important to develop efficient, clean and safe energy storage equipment. Due to its high energy density, low self-discharge rate, long cycle life, no memory effect and green environmental protection, the secondary lithium-ion battery is currently the most excellent in comprehensive performance. The secondary battery is also a key energy storage device to improve the greenhouse effect. [0003] As a representative secondary battery, lithium ion battery refers t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/50H01M4/583H01M10/054H01M10/0567
CPCH01M4/387H01M4/50H01M4/583H01M10/054H01M10/0567Y02E60/10
Inventor 黄令武丽娜沈守宇许跃峰孙世刚李君涛樊晶晶周丽丽沈重亨
Owner XIAMEN UNIV
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