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Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor stability, large side reactions between electrode materials and electrolyte, and low charge and discharge capacity

Pending Publication Date: 2020-07-10
SHANGHAI ZIJIAN CHEM TECH CO LTD
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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 provide a sodium ion battery positive electrode material in order to overcome the defects of low charge and discharge capacity, poor stability, and excessive side reactions between the electrode material and the electrolyte in the prior art. Preparation method thereof, sodium ion battery

Method used

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  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

Examples

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Embodiment 1

[0062] (1) Preparation of layered compounds

[0063] Weigh ferrous sulfate, manganese sulfate, nickel sulfate, and titanyl sulfate in sequence so that the molar ratio of iron, manganese, nickel, and titanium is 0.6:0.1:0.2:0.1 to prepare a soluble transition metal salt. Using deionized water as a solvent, the above-mentioned soluble transition metal salt is formulated into a mixed salt solution with a concentration of 2mol / L, sodium hydroxide is formulated with a precipitant with a concentration of 5mol / L, and ammonia water is formulated with a concentration of 5mol / L. Complexing agent. Add the mixed salt solution, precipitating agent and complexing agent into the reaction kettle at the same time. After the co-precipitation reaction, let it stand for 12 hours, filter, wash with deionized water twice, and dry at 100°C for 10 hours to obtain the precursor powder. After uniformly mixing the above precursor powder with sodium carbonate, sintering at 900°C for 15 hours in an air a...

Embodiment 2

[0067] (1) Preparation of layered compounds

[0068] Weigh ferrous sulfate, manganese sulfate, nickel sulfate, titanyl sulfate, and copper sulfate in sequence so that the molar ratio of iron, manganese, nickel, titanium, and copper is 0.5:0.1:0.2:0.1:0.1 to make a soluble transition metal salt. Using deionized water as a solvent, the above-mentioned soluble transition metal salt is formulated into a mixed salt solution with a concentration of 1mol / L, sodium hydroxide is formulated with a precipitant with a concentration of 2mol / L, and ammonia water is formulated with a concentration of 2mol / L. Complexing agent. The mixed salt solution, precipitating agent and complexing agent were added into the reaction kettle at the same time and co-precipitated. After the co-precipitation reaction, it was aged for 15 hours, filtered, washed twice with deionized water, and dried at 120°C for 12 hours to obtain the precursor powder. After uniformly mixing the above precursor powder with sodi...

Embodiment 3

[0072] (1) Preparation of layered compounds

[0073] Weigh ferrous nitrate, manganese nitrate, nickel nitrate, copper sulfate, and tin tetrachloride in turn, so that the molar ratio of iron, manganese, nickel, copper, and tin is 0.5:0.2:0.1:0.1:0.1 to make a soluble transition metal salt . Using deionized water as a solvent, the above-mentioned soluble transition metal salt is formulated into a mixed salt solution with a concentration of 1mol / L, sodium hydroxide is formulated into a precipitant with a concentration of 4mol / L, and ammonia water is formulated into a concentration of 4mol / L. Complexing agent. Add the mixed salt solution, precipitating agent and complexing agent into the reaction kettle at the same time. After the co-precipitation reaction, let it stand for 10 hours, filter, wash with deionized water twice, and dry at 110°C for 10 hours to obtain the precursor powder. After uniformly mixing the above precursor powder with sodium carbonate, sintering at 800°C for...

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Abstract

The invention discloses a sodium ion battery positive electrode material, a preparation method thereof and a sodium ion battery. The positive electrode material has a core-shell structure, whereinthecomposition of the core is NaxFeyM1-yO2, the composition of the shell is NazMnO2; 0.6 < x < = 1, 0.5 < = y < 1, and 0.44 < = z < 1; M is one or more of Mn, Ni, Ti, Cu, Sn, Mg, Co, V, Cr and Nd. The preparation method of the positive electrode material is simple in process, and the prepared positive electrode material has the advantages of being low in price, high in safety, low in battery manufacturing environment requirement and the like, and can be applied to preparation of sodium ion batteries. The shell material and the core material can generate an ingenious mutual synergistic effect, so the charge-discharge specific capacity of the positive electrode material, the cycle performance and the rate capability of the battery are improved, and particularly, the cycle stability of the battery has outstanding advantages.

Description

technical field [0001] The invention relates to a sodium ion battery, in particular to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery. Background technique [0002] A secondary battery system suitable for large-scale energy storage applications must have the characteristics of extensive resources, low price, environmental friendliness, safety and reliability, while taking into account the requirements of electrochemical performance indicators such as energy density and power density. Existing large-scale secondary battery energy storage technologies have multiple routes, such as lead-acid batteries, flow batteries, sodium-sulfur batteries, and lithium-ion batteries. However, these batteries have disadvantages such as high cost, limited resources, poor cycle life, and poor safety, which cannot meet the practical application requirements of large-scale energy storage. [0003] In recent years, sodium-ion batteries are green, safe...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/62H01M10/054
CPCH01M4/525H01M4/628H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 王红马紫峰车海英
Owner SHANGHAI ZIJIAN CHEM TECH CO LTD
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