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Pre-sodium-modified sodium ion battery positive electrode, and pre-sodium-modified method and application thereof

A sodium-ion battery and positive electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, positive electrodes, etc., can solve the problems of mismatching efficiency of positive and negative electrodes, low energy density of sodium-ion batteries, and great influence of electrode structure. Achieve the effect of improving energy density and cycle life, broad research prospects and application value, and good stability

Active Publication Date: 2021-06-11
SHENZHEN JANAENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these modification methods have a certain effect on improving the Coulombic efficiency in the first week, they have a great impact on the electrode structure
[0004] Therefore, how to greatly improve the first-week charge specific capacity of the positive electrode material and solve the problem of low energy density of sodium-ion batteries caused by the mismatch between the efficiency of the existing positive and negative electrodes is a top priority.

Method used

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  • Pre-sodium-modified sodium ion battery positive electrode, and pre-sodium-modified method and application thereof
  • Pre-sodium-modified sodium ion battery positive electrode, and pre-sodium-modified method and application thereof
  • Pre-sodium-modified sodium ion battery positive electrode, and pre-sodium-modified method and application thereof

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Embodiment 1

[0026] A method for pre-sodiumization of positive electrode materials for sodium ion batteries is provided, comprising the following steps:

[0027] Under the protection of an inert atmosphere, biphenyl and sodium are mixed in an equimolar ratio, and are jointly dispersed in ethylene glycol dimethyl ether (DME) solvent, and the DME solution of the biphenyl sodium of 0.12mol / L is obtained after stirring, and then Na 0.44 MnO 2 Electrode (Na 0.44 MnO 2 : AB:PVDF=8:1:1) (active material loading is about 4mg) immersed in 1mL of DME solution of sodium biphenyl, reacted for 5min, washed with DME three times after the reaction, dried for later use, to obtain the pre- Sodiumized sodium ion battery cathode.

[0028] Na before and after presodiumization 0.44 MnO 2 The electrode is the positive pole, the sodium metal is the negative pole, use 1M NaClO 4 EC / DEC / FEC (v:v:v=10:10:1) electrolyte to assemble half-cells, and conduct charge and discharge tests. The charge-discharge curv...

Embodiment 2

[0031] A method for pre-sodiumization of positive electrode materials for sodium ion batteries is provided, comprising the following steps:

[0032] Under the protection of an inert atmosphere, mix naphthalene and sodium in an equimolar ratio, and disperse them in DME solvent together. After stirring, a DME solution of 0.1mol / L sodium naphthalene is obtained, and Na 3 V 2 (PO 4 ) 3 Electrode (Na 3 V 2 (PO 4 ) 3 : AB: PVDF = 8: 1: 1) (the active substance load is about 4 mg) immersed in 1 mL of DME solution of sodium naphthalene and reacted for 5 minutes. positive electrode of sodium-ion batteries.

[0033] Na before and after presodiumization 3 V 2 (PO 4 ) 3The electrode is the positive pole, the sodium metal is the negative pole, use 1M NaClO 4 EC / DEC / FEC (v:v:v=10:10:1) electrolyte to assemble half-cells, and conduct charge and discharge tests. The charge-discharge curve of the first week is as follows: image 3 As shown in the figure, it shows that after pre-s...

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Abstract

The invention discloses a pre-sodium-modified sodium ion battery positive electrode material, and a pre-sodium-modified method and application thereof. The method comprises the following step: in an inert atmosphere, reacting a sodium-ion battery positive electrode with an aryl sodium-modification reagent solution to obtain a pre-sodium-modified sodium-ion battery positive electrode wherein the aryl sodium modification reagent is one or more of biphenyl sodium, naphthalene sodium, pyrene sodium, anthracene sodium or phenanthrene sodium. A sodium-rich or over-sodium-rich positive electrode is obtained by reacting the positive electrode of the sodium-ion battery with the solution of the aryl sodium modification reagent, the half-battery first-cycle charge specific capacity is obviously improved and is matched with the efficiency of a negative electrode, the first-cycle discharge specific capacity after the whole battery is prepared reaches the theoretical specific capacity of the positive electrode, and the energy density reaches 300Wh / kg; and the method substantially improves the energy density and the cycle life of the battery, has the advantages of wide research prospect and application value, mild reaction conditions, good safety, good stability of the obtained battery, and industrial popularization and application prospect.

Description

technical field [0001] The invention belongs to the technical field of sodium-ion batteries, and in particular relates to a pre-sodiumized positive electrode of a sodium-ion battery and a pre-sodiumized method and application thereof. Background technique [0002] Under the background of the new era of energy shortage and environmental pollution, it is urgent to develop a clean energy storage system with high energy density. 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. Sodium-ion batteries are considered to be an important choice in the field of next-generation energy storage due to their abundant sodium resources, low cost, and environmental friendliness. [0003] The commercial application of sodium ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1391H01M4/1397H01M4/13H01M4/131H01M4/136H01M10/054
CPCH01M4/139H01M4/1391H01M4/1397H01M4/13H01M4/131H01M4/136H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 曹余良周喜艾新平杨汉西
Owner SHENZHEN JANAENERGY TECH CO LTD
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