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Positive electrode active material, positive electrode plate and sodium ion battery

A positive electrode active material and positive electrode sheet technology, applied in the direction of active material electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor actual capacity and cycle performance, hinder the commercialization of sodium-ion batteries, etc., and achieve high charge and discharge The effect of capacity

Pending Publication Date: 2020-07-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently widely studied cathode active materials for sodium-ion batteries have poor actual capacity and cycle performance, which hinders the commercialization of sodium-ion batteries.

Method used

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  • Positive electrode active material, positive electrode plate and sodium ion battery
  • Positive electrode active material, positive electrode plate and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0045] Next, a preparation method of the positive electrode active material in the present application will be described. According to this preparation method, the above-mentioned cathode active material can be obtained. The preparation method comprises the following steps:

[0046] S10. Add copper salt, iron salt, manganese salt and optional salt containing M element into the solvent according to the stoichiometric ratio to prepare a mixed solution.

[0047] S20, adding a precipitating agent and a complexing agent into the mixed solution to obtain a reaction solution, and adjusting the pH value of the reaction solution within a predetermined range.

[0048] S30, make the reaction solution carry out co-precipitation reaction at a predetermined temperature and stirring rate, separate and collect the obtained co-precipitation product, wash the precipitation product several times with an appropriate amount of solvent, and dry at a predetermined temperature to obtain the transiti...

Embodiment 1

[0098] Preparation of cathode active material

[0099] S10. According to the stoichiometric ratio, copper sulfate, ferrous sulfate and manganese sulfate are dissolved in deionized water under the protection of an inert atmosphere to prepare a mixed solution, wherein the total concentration of metal ions is 1.5 mol / L.

[0100] S21. Disperse the precipitating agent sodium hydroxide in deionized water to prepare a precipitating agent solution, wherein the concentration of sodium hydroxide is 4 mol / L. Ammonia water with a concentration of 1mol / L was used as complexing agent solution.

[0101] S22. Add the precipitating agent solution and the complexing agent solution to the mixed solution to obtain a reaction solution, and control the pH value of the reaction solution to 11.2.

[0102] S30, making the reaction solution react at 60°C and a stirring rate of 800rpm for 30h, separating and collecting the obtained coprecipitated product, washing the precipitated product several time...

Embodiment 2～17 and comparative example 1

[0114] Similar to Example 1, the difference is that the reaction parameters in the preparation step of the positive electrode active material were adjusted. The specific parameters are detailed in Table 1 below.

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Abstract

The invention discloses a positive electrode active material, a positive electrode plate and a sodium ion battery. The molecular formula of the positive electrode active material is Na<1-x>Cu<h>Fe<k>Mn<1>M<m>O<2y>, in the molecular formula, m is a transition metal site doping element, M is one or more of Li, Be, B, Mg, Al, K, Ca, Ti, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, In, Sn and Ba, 0<x<=0.33, 0<h<=0.24, 0<=k<=0.32, 0<l <=0.68, 0<=m<0.1, h+k+l+m=1 and 0<=y<0.2. The water content of the positive electrode active material is 6000 ppm or less. By adopting the positive electrode active material provided by the invention, the sodium ion battery has relatively high initial capacity, safety performance and cycle performance at the same time.

Description

technical field [0001] The application belongs to the technical field of energy storage devices, and in particular relates to a positive electrode active material, a positive electrode sheet and a sodium ion battery. Background technique [0002] At present, lithium-ion batteries occupy the core position of power batteries. At the same time, lithium-ion batteries are also facing great challenges, such as the increasing shortage of lithium resources, the rising price of upstream materials, the lag in the development of recycling technology, and the recycling rate of old batteries. Low and so on. Sodium-ion batteries can use the deintercalation process of sodium ions between the positive and negative electrodes to realize charge and discharge, and the reserves of sodium resources are far more abundant than lithium, the distribution is wider, and the cost is much lower than lithium, so sodium-ion batteries have great potential A new generation of electrochemical systems to rep...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/131H01M10/054
CPCH01M4/505H01M4/525H01M4/628H01M4/131H01M10/054H01M2004/021H01M2004/028H01M4/485Y02E60/10C01G49/0072C01G49/0027C01P2006/82C01P2006/12C01P2004/61C01P2004/62C01G45/1221
Inventor 刘倩林文光梁成都郭永胜
Owner CONTEMPORARY AMPEREX TECH CO
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