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Cyano cathode material as well as preparation method and application thereof

A cathode material, cyano technology, applied in battery electrodes, metal cyanide, electrical components, etc., can solve the problems of poor crystallinity of ferrocyanide, low capacity of sodium-ion batteries, unsatisfactory cycle stability, etc., and achieve short cycle times. , the process is simple, the effect of good crystallinity

Active Publication Date: 2017-11-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But also because of this, the prepared ferrocyanide generally has poor crystallinity, which leads to the low capacity and unsatisfactory cycle stability of the sodium-ion battery assembled as the positive electrode material.

Method used

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  • Cyano cathode material as well as preparation method and application thereof
  • Cyano cathode material as well as preparation method and application thereof

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Embodiment 1

[0034] Sodium ferrocyanide was dissolved in deionized water, and stirred evenly to obtain solution A with a concentration of 0.1 mol / L in terms of ferrocyanide ion; metal manganese particles were dispersed in deionized water, and stirred at the same time to obtain dispersion B, Wherein the molar weight of metal manganese is 2.5 times of sodium ferrocyanide; solution A and dispersion liquid B are mixed to obtain mixed liquid C; in mixed liquid C, add 20wt% dilute hydrochloric acid, wherein the molar weight of dilute hydrochloric acid is metal manganese 2.5 times, after 90 ℃ hydrothermal reaction for 8 hours, then cooling, washing and drying to obtain the cyano cathode material. Through ICP analysis, the x value of the product is 1.72, the y value is 0.82, the lattice structure is rhombohedral phase, and the particle size is 200-400nm.

[0035] figure 1 For the X-ray diffraction spectrum of the cyano-based cathode material prepared in this implementation, this material can be a...

Embodiment 2

[0047] Dissolve sodium ferrocyanide in deionized water and stir evenly to obtain solution A with a concentration of 0.2 mol / L in terms of ferrocyanide ion; disperse metal manganese and metal iron particles with a molar ratio of 1:1 in deionized water In water, stir at the same time to obtain dispersion B, in which the total molar weight of metal manganese and metal iron is 3 times that of sodium ferrocyanide; mix solution A and dispersion B to obtain mixed solution C; add 20wt% dilute sulfuric acid, wherein the molar weight of dilute sulfuric acid is 1.5 times that of metal manganese, undergoes hydrothermal reaction at 90°C for 8 hours, then cools, washes, and dries to obtain a cyano-based positive electrode material with a chemical formula of Na x mn 0.5 Fe 0.5 [Fe(CN)] y , where, x=1.71, y=0.80; the lattice structure is rhombohedral phase, and the particle size is 200-400nm.

[0048] The cyano-based material prepared in this embodiment is used as the positive electrode, t...

Embodiment 3

[0050] Sodium ferrocyanide was dissolved in deionized water, and stirred evenly to obtain solution A with a concentration of 0.3 mol / L in terms of ferrocyanide ion; metal iron particles were dispersed in deionized water, and stirred at the same time to obtain dispersion B, Wherein the molar weight of metallic iron is 2.5 times of sodium ferrocyanide; Solution A and dispersion liquid B are mixed to obtain mixed liquid C; In mixed liquid C, add the dilute nitric acid of 20wt%, wherein the molar weight of dilute nitric acid is metallic iron 3 times of that, after 90℃ hydrothermal reaction for 10h, then cooling, washing and drying, the cyano cathode material is obtained, the chemical formula is Na x mn 0.5 Fe 0.5 [Fe(CN)] y , where, x=1.66, y=0.74; the lattice structure is rhombohedral phase, and the particle size is 200-400nm.

[0051] The cyano-based material prepared in this embodiment is used as the positive electrode, the sodium metal is used as the negative electrode, the...

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Abstract

The invention discloses a preparation method of a cyano cathode material. The preparation method comprises specific steps as follows: mixing sodium ferrocyanide with deionized water to obtain a solution A, mixing transition metal M with the deionized water to obtain a dispersion solution B, mixing the solution A with the dispersion solution B, and then adding dilute acid, and obtaining the cyano cathode material through a hydrothermal reaction. According to the preparation method of the cyano cathode material, the morphology and the lattice structure of a target product can be regulated; the prepared cyano cathode material has good crystallinity, and can remarkably improve electrochemical performance of sodium ion batteries after being applied to electrodes of the sodium ion batteries.

Description

technical field [0001] The invention relates to the technical field of novel energy storage batteries, in particular to a cyano-based cathode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, with the popularization of lithium-ion batteries, especially large-scale use in electric vehicles, the consumption of lithium resources is also huge. However, the reserves of lithium resources are limited, and there is currently no effective and economical technology for the recovery of lithium elements in waste lithium-ion batteries. In contrast, the reserves of sodium on the earth are much higher than that of lithium, and the price is much lower than that of lithium. Therefore, in recent years, sodium-ion batteries have attracted much attention. It is generally believed ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054C01C3/08
CPCC01C3/08H01M4/5825H01M10/054Y02E60/10
Inventor 谢健沈志龙孙云坡曹高劭赵新兵
Owner ZHEJIANG UNIV
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