Sodium transition metal oxide with P3 structure and preparation method thereof, and sodium ion battery

A sodium ion battery and transition metal technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of poor sodium ion deintercalation ability, unstable air, low energy density of sodium ion batteries, etc., and achieve structural Instability and poor sodium ion deintercalation ability, the effect of solving sodium defects and good sodium ion deintercalation ability

Active Publication Date: 2019-10-25
钠远新材科技(无锡)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the current sodium-ion battery cathode materials that have low energy density of sodium-ion batteries due to sodium defects or poor sodium ion deintercalation ability due to air instability, the present invention provides a sodium transition metal oxide with a P3 structure and its preparation method

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  • Sodium transition metal oxide with P3 structure and preparation method thereof, and sodium ion battery
  • Sodium transition metal oxide with P3 structure and preparation method thereof, and sodium ion battery
  • Sodium transition metal oxide with P3 structure and preparation method thereof, and sodium ion battery

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preparation example Construction

[0045] Thus, the second aspect of the present invention provides a method for preparing the above-mentioned sodium transition metal oxide of P3 structure, which includes the following steps:

[0046] dissolving nickel salt, manganese salt, and M salt in water to obtain a corresponding mixed transition metal salt solution, and performing coprecipitation reaction on the obtained mixed transition metal salt solution by co-precipitation method to obtain a transition metal carbonate precipitation precursor;

[0047] According to the stoichiometric ratio, the sodium-containing compound and the transition metal carbonate precipitation precursor are mixed and sintered to obtain a sodium transition metal oxide with a P3 structure.

[0048] The preparation method is explained in detail below.

[0049] The nickel salt involved in the raw material can be at least one in nickel sulfate, nickel acetate, nickel nitrate; Described manganese salt is selected from at least one in manganese sulf...

Embodiment 1

[0067] A method for preparing a sodium transition metal oxide of P3 structure, comprising the steps of:

[0068] (a). Mix and dissolve nickel sulfate and manganese sulfate in water at a molar ratio of 1:1, configure a mixed transition metal salt solution of 2mol / L nickel sulfate and manganese sulfate, use 2mol / L sodium carbonate and 0.2mol / L ammonia water mixed aqueous solution is used as a precipitant, and the pH value is controlled to be about 8.0, and the nickel-manganese carbonate precursor is prepared by co-precipitation.

[0069] (b). Mix sodium carbonate with the nickel-manganese carbonate precursor obtained in step (a) according to the molar ratio of 0.45:1, place it in a resistance heating air atmosphere furnace and sinter at a constant temperature of 500°C for 5 hours, then raise the temperature to 800° C. and sintered at a constant temperature for 20 h, and cooled naturally to room temperature to obtain sample 1.

[0070] XRD, ICP and SEM tests were carried out on...

Embodiment 2

[0072] A method for preparing a sodium transition metal oxide of P3 structure, comprising the steps of:

[0073](a). Mix and dissolve nickel sulfate and manganese sulfate in water at a molar ratio of 1:1, configure a mixed transition metal salt solution of 1.5mol / L nickel sulfate and manganese sulfate, use 1.5mol / L sodium carbonate and A mixed aqueous solution of 0.15 mol / L ammonia water was used as a precipitating agent, and the pH value was controlled to be about 8.0, and nickel-manganese carbonate precursor was prepared by co-precipitation.

[0074] (b). Sodium carbonate is mixed with the nickel manganese carbonate precursor obtained in step (a) according to the molar ratio of 0.50:1, and then placed in a resistance heating air atmosphere furnace for constant temperature sintering at 500 ° C for 3 hours, and then the temperature is raised to 750° C. and sintered at a constant temperature for 15 hours, and cooled naturally to room temperature to obtain sample 2.

[0075] XR...

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Abstract

The invention relates to the technical field of sodium ion batteries, and particularly provides a sodium transition metal oxide with a P3 structure and a preparation method thereof, and a sodium ion battery. The sodium transition metal oxide with the P3 structure has a general formula shown in the specification: NaxNiaMnbMcO2+d, wherein, 0.9<=x<=1.1, a>0, b>0, c>=0, a+b+c=1, d>=0, M is selected from one or more of Cu, Mg, Fe, Zn, Ti, Co and Al. The sodium transition metal oxide with the P3 structure has a stable P3 crystalline phase structure, does not have sodium defects, can solve the problems of sodium ion deintercalation, air instability and the like of the conventional sodium ion battery positive electrode material after being used as a sodium ion battery positive electrode active material to prepare a sodium ion battery, and is beneficial to the commercial application of the sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a sodium transition metal oxide with a P3 structure, a preparation method thereof, and a sodium ion battery. Background technique [0002] Sodium-ion battery is a new type of battery that is most likely to replace lithium-ion batteries. Among them, the relatively mature positive electrode material in sodium-ion batteries is a layered positive electrode material that does not contain cobalt. This material can have good stability without adding cobalt. properties, such as transition metal oxides containing sodium (the general chemical formula is Na x TMO 2 , where TM represents transition metals such as Mn, Ni, Fe, Ti, V), which has a high specific capacity (100-190mAh / g), but because of its low specific capacity ratio and voltage platform, its corresponding Na Ion batteries also have a lower energy density than lithium-ion batteries. Na x TMO 2 The co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/366H01M4/483H01M4/485H01M4/505H01M4/525H01M10/054H01M2004/028Y02E60/10
Inventor 王军邓永红池上森吴惟
Owner 钠远新材科技(无锡)有限公司
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