Sodium ion battery negative electrode pre-sodium modification method, obtained negative electrode material and sodium ion battery

A sodium ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low efficiency in the first week, and achieve the effects of short reaction time, strong safety, and easy industrialization

Inactive Publication Date: 2019-03-29
WUHAN UNIV
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of low first-cycle efficiency of the negative electrode material of the existing sodium ion battery, the present invention provides a chemical pre-sodiumization method of the negative electrode material, which greatly improves the first-cycle efficiency of the negative electrode material, thereby providing a high energy density sodium battery system The practical development of

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  • Sodium ion battery negative electrode pre-sodium modification method, obtained negative electrode material and sodium ion battery
  • Sodium ion battery negative electrode pre-sodium modification method, obtained negative electrode material and sodium ion battery
  • Sodium ion battery negative electrode pre-sodium modification method, obtained negative electrode material and sodium ion battery

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Embodiment 1

[0025] Mix equimolar biphenyl and metal sodium, dissolve in ethylene glycol dimethyl ether solvent, and prepare 0.25mol / L biphenyl sodium solution. Take 10mL of sodium biphenyl solution, add 1g of hard carbon powder, and react for 10min under the protection of an inert atmosphere. The product is suction-filtered, washed and dried to obtain a pre-sodiumized hard carbon material, and the hard carbon material is used as a negative electrode active material to prepare a negative electrode sheet. figure 1 The first-week charge-discharge curves of the negative electrode sheet with the hard carbon material as the active material were compared before and after pre-sodiumization. It can be seen from the figure that the first-week efficiency of the untreated hard carbon anode is only 60.7%, and the first-week efficiency is significantly increased to 95.8% after pre-sodium treatment; meanwhile, the first-week reversible capacity slightly increases from 269mAh / g to 293mAh / g. figure 2 It...

Embodiment 2

[0027] Mix equimolar naphthalene and metallic sodium, and dissolve them in a solvent of diglyme, to obtain a 0.5 mol / L sodium naphthalene solution. The Sb / C composite electrode sheet is soaked in the sodium naphthalene solution for 30 minutes to react, and after the reaction is completed, it is washed and dried to obtain a pre-sodiumized Sb / C negative electrode sheet. image 3 The charge-discharge curves of the Sb / C anode in the first week before and after pre-sodium treatment were compared. It can be seen from the figure that the first-week efficiency of the untreated Sb / C anode is only 85.23%, and the first-week efficiency increases to 97.5% after pre-sodium treatment, and the reversible capacity of the material remains almost unchanged.

Embodiment 3

[0029] Mix equimolar phenanthrene and sodium metal and dissolve in tetraethylene glycol dimethyl ether solvent to prepare 0.1mol / L sodium phenanthrene solution. Spray the freshly prepared sodium phenanthrene solution evenly on the Sn 4 P 3 / C electrode sheet surface, let it stand for 20 minutes, wash and dry after the reaction is completed, and then the pre-sodiumized Sn 4 P 3 / C electrode. Figure 4 Sn before and after presodiumization was compared 4 P 3 / C material charge and discharge curve. It can be seen from the figure that the untreated Sn 4 P 3 The first-week charge-discharge capacity of the / C material is 846.2 / 1055.2mAh / g, and the first-week efficiency is only 80.2%. After pre-sodium treatment, the charge-discharge capacity in the first week was 851.7 / 878.7mAh / g, and the coulombic efficiency increased to 96.9%. The surface pre-sodium treatment eliminated the irreversible capacity in the first week and improved the coulombic efficiency of the material.

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Abstract

The invention provides a sodium ion battery negative electrode pre-sodium modification method, an obtained negative electrode material and a sodium ion battery. A sodium ion battery negative electrodematerial is enabled to react with an aryl sodium solution, wherein an aryl sodium reagent is a polycyclic conjugated aryl sodium compound. Irreversible capacity existing in a first-cycle discharge process of the negative electrode material can be eliminated, and the first-cycle coulombic efficiency of a negative electrode is greatly improved. The method can be carried out at normal temperature, and is short in reaction time, simple in process, controllable in reaction depth, high in safety and easy to industrialize. Meanwhile, the energy density and the cycling stability of the sodium ion whole battery assembled by matching the pre-sodium-modified negative electrode and the sodium storage positive electrode are greatly improved, so that the possibility is provided for the practical development of a high-energy-density sodium battery system.

Description

technical field [0001] The invention relates to a method for pre-sodiumizing a negative electrode of a sodium ion battery, as well as the obtained negative electrode material and a sodium ion battery, belonging to the field of new energy. Background technique [0002] Large-scale power storage is one of the key issues in the development of new energy technologies today. Whether it is the efficient use of renewable new energy (such as photovoltaic and wind power), or the future clean transportation based on electric vehicles, cheap and efficient large-scale power storage is required as technical support. Among the existing electrochemical energy storage methods, lithium-ion batteries have attracted widespread attention due to their superior electrochemical performance, but whether the resource reserves of lithium on the earth can support large-scale energy storage applications is still a controversial issue. Na-ion batteries are considered to be an ideal alternative for ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/054H01M4/62
CPCH01M4/364H01M4/38H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 钱江锋艾新平沈弈非陈慧杨汉西
Owner WUHAN UNIV
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