Water system chargeable sodium-ion battery

A sodium ion battery, sodium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as uneven distribution and limited lithium reserves, and achieve the effects of wide range of uses, loose assembly environment, and simple process flow

CN103022577AInactive Publication Date: 2013-04-03WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-04-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a water system chargeable sodium-ion battery system. The system uses a concept of a 'rocking chair battery' of a lithium ion battery; and the entire battery system is formed by using sodium-based prussian blue matter as an embedded anode, titanium sodium phosphate as an embedded cathode, and sodium-contained inorganic salt solution as electrolyte. The system has the advantages of high discharge voltage, large specific capacity, good rate capability, long cycle life and the like, and further has the characteristics of green and environmental friendliness, and high security and no pollution. The system very hopefully becomes an electrochemical stored energy system with low price and environmental friendliness.
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Description

technical field

[0001] The invention relates to a water-based rechargeable sodium-ion battery, which belongs to the field of secondary batteries and also belongs to the technical field of energy materials. Background technique

[0002] In recent years, a new energy revolution centered on promoting the development of renewable energy has been surging. Renewable energy such as solar energy and wind energy has the characteristics of abundant resources, clean and pollution-free, and is considered to be the fundamental and long-term way to solve energy problems. However, limited by natural conditions, solar energy and wind energy are intermittent and unstable, and cannot be controlled according to demand, making it difficult to connect to the grid for power generation. Large-scale energy storage systems must be used to ensure grid stability and continuity of power supply.

[0003] Existing large-scale energy storage technologies have a variety of technical routes, such as lead-a...

Examples

preparation example Construction

[0019] The preparation of positive / negative pole of the present invention and Na x m y Fe(CN) 6 -NaTi 2 (PO 4 ) 3 The general steps of the assembly of the system full battery are as follows:

[0020] (1) Na x m y Fe(CN) 6 Preparation of positive electrode

[0021] MCl n Prepare a solution with a certain concentration, drop Na 4 Fe(CN) 6 in aqueous solution and stirred for 24 h. The resulting precipitate was washed by centrifugation and dried in vacuum to prepare Na x m y Fe(CN) 6 Cathode material.

[0022] (2) NaTi 2 (PO 4 ) 3 Preparation of / C negative electrode

[0023] Take Na 2 CO 3 ,TiO 2 , NH 4 h 2 PO 4 As raw material, NaTi was prepared by solid phase method 2 (PO 4 ) 3 , and then use chemical vapor deposition (CVD) method for carbon coating, you can prepare NaTi 2 (PO 4 ) 3 / C negative pole.

[0024] (3) Na x m y Fe(CN) 6 -NaTi 2 (PO 4 ) 3 Assembly of system full battery

[0025] The cathode material is Na x m y Fe(CN) 6 , the ...

Embodiment 1

[0027] Example 1. Na 2 NiFe(CN) 6 -NaTi 2 (PO 4 ) 3 Assembly and performance of system full battery

[0028]Prepare positive / negative electrode material according to the method in embodiment 1, positive electrode material adopts Na 2 NiFe(CN) 6 , the negative electrode material is NaTi 2 (PO 4 ) 3 / C, according to the weight ratio of active material: carbon black: binder = 80:10:10, mix evenly, coat on the current collector, and after drying, press it into positive electrode film and negative electrode film respectively. Using glass fiber as the diaphragm, 5 mol / L NaNO 3 The aqueous solution is used as the electrolyte to assemble a full battery.

[0029] The performance of the positive electrode material: the positive electrode material is used as the working electrode, the saturated calomel electrode is used as the reference electrode, and the large-area Ni mesh is used as the counter electrode. In 1.0 mol / L NaNO 3 The electrochemical performance was tested in solu...

Embodiment 2

[0033] Example 2. Na 2 Cu 0.5 mn 0.5 Fe(CN) 6 - NaTi 2 (PO 4 ) 3 Assembly and performance of system full battery

[0034] Prepare positive / negative electrode material according to the method in embodiment 1, positive electrode material adopts Na 2 Cu 0.5 mn 0.5 Fe(CN) 6 , the negative electrode material is NaTi 2 (PO 4 ) 3 / C, according to the weight ratio of active material: carbon black: binder = 85:10:5, mix evenly, coat on the current collector, and after drying, press it into positive electrode film and negative electrode film respectively. Using non-woven fabric as the diaphragm, the saturated Na 3 PO 4 The aqueous solution is used as the electrolyte to assemble a full battery. Such as Figure 4 As shown, the discharge specific capacity of the battery reaches 100 mAh / g at 2 C current density; at 5 C, 10 C, 20 C, 50 C and 80 C current densities, the discharge specific capacity is 93, 86, 82, 72, and 61 mAh / g; even at a current density as high as 100 C, th...