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Sodium ion secondary battery, active substance, positive electrode and negative electrode used by sodium ion secondary battery, and preparation method of active substance

A technology of active materials and secondary batteries, applied in secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problems of electrode material cycle instability and poor rate performance

Active Publication Date: 2014-02-12
BEIJING HINA BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a kind of preparation method of sodium ion secondary battery active material, positive and negative pole and active material, can overcome the shortcomings such as current sodium ion secondary battery electrode material circulation instability, poor rate performance

Method used

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  • Sodium ion secondary battery, active substance, positive electrode and negative electrode used by sodium ion secondary battery, and preparation method of active substance
  • Sodium ion secondary battery, active substance, positive electrode and negative electrode used by sodium ion secondary battery, and preparation method of active substance
  • Sodium ion secondary battery, active substance, positive electrode and negative electrode used by sodium ion secondary battery, and preparation method of active substance

Examples

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Effect test

Embodiment 1

[0036] This example is used to illustrate the preparation and application of the active substance of the present invention.

[0037] This embodiment adopts solid-phase method to prepare active material Na 0.44 mn 0.44 Ti 0.56 o 2 , the specific steps are: the nano anatase TiO 2 (Particle size is 50-100nm), Na 2 CO 3 (analytical pure) and Mn 2 o 3 Mix according to the stoichiometric ratio, mix and grind in an agate mortar for half an hour to obtain the precursor, and transfer the precursor sheet to Al 2 o 3 In the crucible, it was treated in a muffle furnace at 900°C for 20 hours, and the resulting blue powder flakes were ground and ready for use, which was the active substance Na 0.44 mn 0.44 Ti 0.56 o 2 , its XRD pattern and space group are Pbam see figure 1 and figure 2 .

[0038] The above active material is used as an electrode material to prepare a sodium ion battery. The specific steps are: the prepared active substance Na 0.44 mn0.44 Ti 0.56 o 2 The ...

Embodiment 2

[0040] This example is used to illustrate the application of the active material of the present invention as an electrode material in a sodium ion battery.

[0041] This embodiment adopts embodiment 1 solid-phase method to prepare active material Na 0.44 mn 0.44 Ti 0.56 o 2 . The above active materials were prepared into sodium ion batteries. The specific steps are: the prepared active substance Na 0.44 mn 0.44 Ti 0.56 o 2 Mix the powder with acetylene black and binder PVDF at a weight ratio of 75:15:10, add an appropriate amount of NMP solution, grind in a dry environment at room temperature to form a slurry, and then evenly coat the slurry on the current collector copper foil , cut into 8×8mm pole pieces after drying, dried at 100°C for 10 hours under vacuum conditions, and then transferred into a glove box for later use. The assembly of the simulated battery was carried out in an Ar atmosphere glove box, with a metal sodium sheet as the counter electrode, 1M NaPF ...

Embodiment 3

[0043] This example is used to illustrate the preparation and application of the positive electrode active material of the present invention.

[0044] In this example, the material synthesized in Example 2 was used as the positive electrode material to assemble a sodium ion battery, and the above positive electrode active material was prepared into a sodium ion battery, and an electrochemical test was performed. Its preparation process and testing method are the same as in Example 2. The test adopts discharge first and then charge, the voltage test range is 2.6-3.8V, the test current density is 0.1C, the test results are shown in Figure 6 , Figure 6 Charge and discharge curves for its first week. Depend on Figure 6 It can be seen that the discharge capacity in the first week can reach 55mAh / g, and the efficiency in the first week is 93.8%.

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Abstract

The invention discloses a sodium ion secondary battery, an active substance, a positive electrode and a negative electrode used by the sodium ion secondary battery, and a preparation method of the active substance. The space group of the active substance is Pbam, and the chemical general formula of the active substance is Nax[Mn(x-y)Ay]Ti1-xO2-delta, wherein A is one of Al, Fe, Ni, Cu, Zn, Co, Mo, V and Cr, x is more than 0.2 and less than 0.8, y is not less than 0 and not more than 0.1, and delta is not less than 0 and not more than 0.05. The active substance of the sodium ion secondary battery can be used as a positive electrode material and can be further used as a negative electrode material; when the active substance is used as the positive electrode, the sodium storage voltage is between 2.6-3.6V, and the average voltage is 3.0V; when the active substance is used as the negative electrode, the sodium storage voltage is between 1.5-2.6V, and the average voltage is 2.0V; the average working voltage of a total battery constructed by using the active substance as the positive electrode and the negative electrode is 0.8V.

Description

technical field [0001] The invention relates to an active material for a sodium ion secondary battery, a positive and negative electrode and a preparation method for the active material thereof, as well as a sodium ion secondary battery using the active material and its use. Background technique [0002] Since Sony successfully commercialized lithium-ion batteries in 1990, lithium-ion batteries have been widely used in people's lives, from small household appliances to high-energy-density, high-power applications, such as electric vehicles and smart grids . Lithium-ion batteries are internationally recognized ideal chemical power sources, with the advantages of small size, high energy density, and high voltage. However, with the gradual consumption of limited lithium resources, the price of lithium is gradually increasing, and seeking alternative products for lithium-ion batteries has become an important research direction. As an alkali metal element similar to lithium, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/054
CPCY02E60/122C01G23/003C01G45/12C01G53/50H01M4/485H01M4/505H01M4/525H01M10/05Y02E60/10
Inventor 胡勇胜王跃生徐淑银李泓陈立泉
Owner BEIJING HINA BATTERY TECH CO LTD
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