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Aqueous gel-state electrolytes, electrode additives and solid-state sodium-ion batteries with low-temperature operating characteristics

A sodium-ion battery, a technology of working characteristics, applied in the direction of electrolyte immobilization/gelation, battery electrodes, secondary batteries, etc., to achieve easy large-scale industrial production, reduce the risk of safety accidents, and simple and easy preparation methods Effect

Active Publication Date: 2021-10-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the current aqueous electrolytes, the present invention provides an aqueous gel-state electrolyte that can work at -50°C to 25°C and does not devitrify

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  • Aqueous gel-state electrolytes, electrode additives and solid-state sodium-ion batteries with low-temperature operating characteristics
  • Aqueous gel-state electrolytes, electrode additives and solid-state sodium-ion batteries with low-temperature operating characteristics
  • Aqueous gel-state electrolytes, electrode additives and solid-state sodium-ion batteries with low-temperature operating characteristics

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preparation example Construction

[0032] The invention also shows a preparation method of the solid state sodium ion battery. In some embodiments, the gel electrolyte (electrolyte colloid) is coated on the separator, and the battery including the positive electrode, the negative electrode, the separator and the current collector is assembled and placed in the case. In some other embodiments, the electrolyte is coated on the positive electrode or the negative electrode, and the electrode piece coated with the electrolyte and the current collector are assembled into a battery and placed in the case.

[0033] In addition, the silica-loaded sulfate can also be used as a pole piece additive, and the pole piece additive can be mixed into other battery pole piece raw materials to prepare a battery pole piece. The mass ratio of the pole piece additive may be 5%-40%.

[0034] In some embodiments, the solid-state sodium-ion battery includes both the aqueous gel-state electrolyte and the pole piece additive of the prese...

Embodiment 1

[0039] Preparation of pole piece additive: 15g of particle size 7-40nm, specific surface area 200m 2 50mL of hydrophilic fumed silica / g was dispersed in an aqueous electrolyte solution containing 1mol / L lithium sulfate and 1mol / L sodium sulfate, stirred uniformly for 1 hour, added 50mL methanol, and stirred uniformly for 30 minutes to obtain a low-temperature resistant electrolyte . Put the electrolyte above into an oven (100° C.) and dry it for 2 hours to obtain a silica-supported electrolyte (that is, a pole piece additive).

[0040] Lithium manganate is used as the positive electrode, and polyanthraquinone (PVAQ) is used as the negative electrode. When preparing the battery pole piece, the pole piece additive is mixed into it with a mass ratio of 25wt%. chemical properties.

[0041] figure 1 It shows that in the temperature range of -50°C to 25°C, the battery works normally, and the capacity at -50°C is not much different from that at room temperature of 25°C. image 3 ...

Embodiment 2

[0046] Preparation of pole piece additive: Disperse 50 mL of hydrophilic fumed silica with a particle size of 7-40 nm and a specific surface area of ​​200 m2 / g in an electrolyte solution containing 1 mol / L of lithium sulfate and 1 mol / L of sodium sulfate, and stir evenly for 1 hour , add 50mL of methanol, and stir evenly for 30 minutes to prepare a low temperature resistant electrolyte. Put the above-mentioned electrolyte substance into an oven (100°C) and dry it for 1 hour to obtain a silica-supported electrolyte (that is, an electrode additive). The pole piece additives are added to the positive and negative pole pieces, assembled with the low temperature resistant electrolyte to form a battery, and the battery capacity is tested.

[0047] Compared with the battery (comparative example 1) without adding silica-loaded electrolyte, from Figure 5 It can be seen that the specific capacity of the battery with the addition of the pole piece additive is much higher than that of t...

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Abstract

The invention discloses a water-based gel-state electrolyte, a pole piece additive and a solid-state sodium-ion battery with low-temperature working characteristics. The water-based gel-state electrolyte includes fumed silicon dioxide with a gel-conducting ion effect and a sulfate electrolyte loaded on it, and the preparation method of the water-based gel-state electrolyte includes: adding gas-phase silicon dioxide to the sulfate-based electrolyte Silica and methyl alcohol obtain gel state electrolyte; Wherein, the concentration of sulfate in the said sulfate salt system electrolytic solution is 0.5-3mol / L, the mole of the sulfate radical in the described fumed silicon dioxide and sulfate salt system electrolyte The ratio is (1-5):1, preferably: (1.5-2.5):1; the volume ratio of the sulfate-based electrolyte to methanol is (1-10):1, preferably (1-2):1.

Description

technical field [0001] The invention belongs to the technical field of water-based sodium-ion batteries, and in particular relates to water-based gel-state electrolytes, pole piece additives and solid-state sodium-ion batteries with low-temperature operating characteristics. Background technique [0002] With the rapid development of the economy, the entire society is increasingly dependent on energy. The country is vigorously promoting the construction of smart grids with energy storage technology as the key link. However, for organic sodium-ion batteries, the application of sodium-ion batteries is limited due to harsh assembly conditions, high production costs, and potential safety issues caused by the electrolyte being an organic flammable component. If the organic electrolyte is replaced by an aqueous solution, the safety problem of sodium-ion batteries can be solved, and a strict assembly environment is not required, which greatly reduces production costs and is more in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36H01M4/62
CPCH01M4/624H01M10/36H01M2300/0085Y02E60/10
Inventor 刘宇程颖博杨建华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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