Doped and coated sodium ion battery positive electrode material and preparation method thereof

A technology for sodium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing battery cycle performance, phase transition of electrode materials, irreversible de-intercalation, etc. The effect of improving electronic conductivity, improving cycle performance and stability

Pending Publication Date: 2022-04-08
JINGMEN GEM NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although sodium-ion batteries have unique advantages in terms of resources and cost, the radius of sodium ions (0.102nm) is larger than that of lithium ions (0.076nm), so sodium ions are relatively stable in rigid structures and difficult to reversibly deintercalate
Even if deintercalation can occur, the kinetics of sodium ion intercalation and deintercalation is very slow, and it is easy to cause an irreversible phase change in the structure of the electrode material, reducing the cycle performance of the battery
At present, almost all literatures believe that Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 O at 4.2V 2- will lose electrons and eventually form O 2 Precipitation from the crystal lattice densifies the surface lattice, resulting in irreversible capacity loss

Method used

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  • Doped and coated sodium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0031] The nickel sulfate and manganese sulfate solutions are formulated into a 2mol / L salt solution according to the molar ratio of nickel ions and manganese ions at 1:2. Inject the prepared salt solution into the reaction kettle with a speed of 360rpm at a speed of 10L / h. At the same time, dissolve 0.4mol / L sodium metaaluminate solution and vanadium pentoxide in hydrogen at a speed of 2.5L / h. The 0.4mol / L sodium vanadate solution prepared by sodium oxide is added in the reaction kettle, and the complexing agent ammonia solution of 2mol / L and the precipitating agent sodium hydroxide solution of 4mol / L are added to the reaction kettle at the same time to carry out co-precipitation under an inert atmosphere. Precipitation reaction, keep the pH value between 11.4-12, control the reaction temperature at about 60°C, react for 60h, then centrifuge and filter to separate, wash to neutral, dry at 160°C for 8h, and sieve to get the molecular formula Ni 0.3 mn 0.6 V0.05 Al 0.05 (OH) ...

Embodiment 2

[0036] The nickel chloride and manganese chloride solutions are prepared into a 2mol / L salt solution according to the molar ratio of nickel ions and manganese ions at 1:9. At a rate of 15L / h, inject the prepared salt solution into a reaction kettle with a rotation speed of 450rpm. At the same time, inject 0.2mol / L sodium metaaluminate solution at a rate of 1.5L / h and the The 0.2mol / L sodium vanadate solution prepared by dissolving ammonium vanadate in sodium hydroxide is added in the reactor, and the complexing agent ammonia solution of 2mol / L and the precipitating agent sodium hydroxide of 4mol / L are added in the reactor at the same time Co-precipitate the solution under an inert atmosphere, keep the pH value between 11.0-11.8, control the reaction temperature at about 48°C, react for 100h, then centrifugally filter and separate, wash to neutral, dry at 100°C for 14h, and sieve The molecular formula is obtained as Ni 0.1 mn 0.88 V 0.01 Al 0.01 (OH) 2 Precursor materials ...

Embodiment 3

[0041] The nickel acetate and manganese acetate solutions are prepared into a 2mol / L salt solution according to the molar ratio of nickel ions and manganese ions at 4:1. Inject the prepared salt solution into the reaction kettle with a speed of 400rpm at a speed of 6L / h. The 0.2mol / L sodium vanadate solution prepared by dissolving vanadium oxide in sodium hydroxide is added to the reaction kettle, and at the same time, 2mol / L complexing agent ammonia solution and 4mol / L precipitant sodium hydroxide solution are added to the reaction kettle Carry out co-precipitation reaction under inert atmosphere, keep the pH value between 10.6-11.0, control the reaction temperature at about 50°C, react for 80h, then separate by centrifugal filtration, wash to neutral, dry at 90°C for 20h, and sieve to obtain The molecular formula is Ni 0.72 mn 0.18 V 0.01 Al 0.09 (OH) 2 Precursor materials for sodium-ion batteries;

[0042] Mix the above-mentioned sodium ion battery precursor with sodi...

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Abstract

The invention discloses a doped and coated sodium ion battery positive electrode material and a preparation method thereof, the chemical structural formula of the material is NaNixMnyVzAl1-x-y-zO2, x is greater than or equal to 0.1 and less than 0.9, y is greater than or equal to 0.09 and less than 0.9, and z is greater than or equal to 0.01 and less than 0.09. According to the method, metal elements aluminum and vanadium are doped to replace part of nickel and manganese when a precursor is prepared, so that the transmission rate and the electronic conductivity of sodium ions are improved; and then coating the sodium-ion battery positive electrode material with an active oxygen remover MS2 to prepare the doped and coated sodium-ion battery positive electrode material which has good energy density and cycling stability.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium-ion batteries, in particular to a doped-coated anode material for sodium-ion batteries and a preparation method thereof. Background technique [0002] With the increasingly serious global environmental pollution, the demand for new energy sources with high efficiency, cleanness and sustainable development continues to expand. Lithium-ion batteries, as a new type of high-energy green battery, have received widespread attention, but the distribution of lithium resources in lithium-ion batteries is uneven. And the shortage of resources may limit the development of lithium-ion batteries in the future. Due to the similar chemical properties of sodium and lithium, sodium-ion batteries are the most likely to become one of the replacements for lithium-ion batteries. The working principle of sodium-ion batteries is basically the same as that of lithium-ion batteries. During charging, Na...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/054
CPCY02E60/10
Inventor 许开华范亮姣张坤李聪杨幸薛晓斐李雪倩
Owner JINGMEN GEM NEW MATERIAL
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