Negative material for sodium-ion battery and preparation method for negative material and sodium-ion battery

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance decay, battery capacity decay, and obvious volume expansion and shrinkage effects, so as to improve electrochemical performance and suppress volume. Effect, simple effect of preparation method

Active Publication Date: 2016-05-04
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the obvious volume expansion and contraction effect in the process of intercalation / detachment of the tin-based negative electrode material of the sodium ion battery in the prior art, and the electrode material is prone to rupture after repeated charging and discharging, resulting in attenuation of battery capacity and poor cycle performance. The defects of attenuation, unsatisfactory stability and the inability to take into account the specific capacity of the material provide a negative electrode material for a sodium ion battery and a preparation method thereof, and a sodium ion battery

Method used

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  • Negative material for sodium-ion battery and preparation method for negative material and sodium-ion battery
  • Negative material for sodium-ion battery and preparation method for negative material and sodium-ion battery
  • Negative material for sodium-ion battery and preparation method for negative material and sodium-ion battery

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Embodiment 1

[0036] Preparation method of sodium ion battery negative electrode material:

[0037] (1) Weigh tin tetrachloride and copper sulfate in turn, so that the molar ratio of tin and copper is 0.4:0.6; weigh titanium dioxide with a particle size of 180-220nm, so that the number of moles of titanium is equal to the ratio of moles of tin and copper. And; Take monolayer graphene, make graphene quality be 8% of the total mass of tin element and copper element;

[0038]Using deionized water as a dispersant, tin tetrachloride and copper sulfate are formulated to make the total concentration of tin and copper elements 1mol / L, and titanium dioxide and graphene are added to disperse evenly to obtain a mixed solution; sodium hydroxide is formulated to a concentration of 5mol / L precipitant;

[0039] (2) Add the precipitating agent into the reaction kettle containing the mixed solution at a uniform speed. After the mixed reaction, let it stand for 12 hours, filter, wash with deionized water tw...

Embodiment 2

[0043] Preparation method of sodium ion battery negative electrode material:

[0044] (1) Weigh tin protochloride and copper sulfate successively, make the molar ratio of tin element and copper element be 0.1:0.9; Take the titanium dioxide with particle diameter about 200nm, make the molar number of titanium element be equal to the sum of tin-copper molar number; Weighing 5-10 layers of graphene, so that the graphene mass is 2% of the total mass of tin and copper elements;

[0045] Using deionized water as a dispersant, tin protochloride and copper sulfate are formulated so that the total concentration of tin and copper elements is 2mol / L, and titanium dioxide and graphene are added to disperse evenly to obtain a mixed solution; sodium hydroxide is formulated to a concentration of 1mol / L precipitant;

[0046] (2) Add the precipitating agent into the reaction kettle containing the mixed liquid at a uniform speed, and after the mixed reaction, age and stand for 11 hours, filter...

Embodiment 3

[0050] Preparation method of sodium ion battery negative electrode material:

[0051] (1) Weigh stannous chloride and cupric chloride in turn, so that the molar ratio of tin and copper is 0.3:0.7, and weigh titanium dioxide with a particle size of about 200nm, so that the molar number of titanium is equal to the sum of the molar numbers of tin and copper ; Weighing 5-10 layers of graphene, so that the quality of graphene is 10% of the total mass of tin element and copper element;

[0052] Using deionized water as a dispersant, tin protochloride and cupric chloride are formulated so that the total concentration of tin and copper elements is 2mol / L, and titanium dioxide and graphene are added to disperse evenly to obtain a mixed solution; sodium hydroxide is prepared into a precipitating agent with a concentration of 3mol / L;

[0053] (2) Add the precipitating agent into the reaction kettle containing the mixed liquid at a uniform speed, and after the mixed reaction, age and sta...

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Abstract

The invention discloses a negative material for a sodium-ion battery and a preparation method for the negative material and the sodium-ion battery. The method comprises the steps as follows: a precursor is cooled in a reducing atmosphere after being sintered; the precursor is a solid obtained by mixing and reacting of a mixed solution containing graphene, titanium dioxide, a tin salt and a copper salt and a precipitant; the molar ratio of a tin element to a copper element to a titanium element is x to (1-x) to 1; and x is less than or equal to 0.5 and more than 0. The preparation method disclosed by the invention is simple and convenient. According to the prepared material, various raw material components cooperate with one another, so that the aggregation effect of tin-copper particles is effectively reduced; the volume effect of an alloy formed by tin and sodium in the discharge process is suppressed; the cycle performance, the stability, the conductivity and the charge-discharge capacity of the material can be considered; the negative material for the sodium-ion battery can be applied to preparation of a soft package sodium-ion battery; and compared with a lithium-ion battery, the sodium-ion battery is green, safe and low in price, and has great advantages as an energy storage application.

Description

technical field [0001] The invention relates to a sodium ion negative electrode material, a preparation method thereof, and a sodium ion battery. Background technique [0002] Energy storage technology is one of the important ways to efficiently utilize renewable energy such as wind energy and solar energy, and it is also an important means for power grid peak regulation. Among the existing large-scale energy storage methods, the electrochemical energy storage system has attracted widespread attention due to its high efficiency and flexibility, and it is also a research hotspot at home and abroad. In recent years, secondary batteries, especially lithium-ion batteries, have been placed with high expectations. However, for the lithium-ion battery energy storage system, lithium, as a key element supporting its development, has uneven resource distribution, limited reserves, and high cost, which have become important factors restricting its large-scale energy storage application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/054
CPCH01M4/364H01M10/054Y02E60/10
Inventor 王红廖小珍马紫峰
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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