Air cell with improved leakage resistance
A battery and air technology, applied in the field of electrochemical batteries, can solve problems such as inability to fully maintain electrolytes, reduce the number of active materials, and limit the high-rate discharge capacity of batteries
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0049] In addition to swelling, other types of changes may occur in the transformable element. For example, polyvinyl alcohol (PVA), in addition to swelling, can become hard and liquid-impermeable when it comes into contact with a strongly alkaline electrolyte. PVA can be added to the base material (eg, as a surface coating or contained within the pores of the base material) to form a transformable element.
[0050] Another example of a material that can be used to make the transformable element is polyamide resin. Polyamide resins can be very sticky. When such resins are loaded into a porous base film, compression of the film can lead to collapse of the pores so that the resin coating the pores tends to close the pores. A polyamide resin may be added to a base material used as, for example, an air diffusion layer. This can be achieved using a suitable method, for example, by soaking the base material (eg PTFE film) in a solution of polyamide resin dissolved in a solvent. ...
Embodiment 2
[0080] The potential benefit of acid addition to absorbent mats (e.g., which may serve as internal air diffusion layers or additional absorbent layers) to neutralize zinc / air cells with potassium hydroxide electrolytes was determined by adding various amounts of 2 The effect on pH of the acids, citric and boric, into a 33 wt % potassium hydroxide solution, was evaluated for each of the 2 acids using the following procedure:
[0081] 1. Pour a small amount (eg about 1-2 g) of 33 wt% potassium hydroxide solution into a pre-weighed weighing dish.
[0082] 2. Weigh the weighing dish and electrolyte and determine the pH of the solution.
[0083] 3. A small piece of blotting paper (for example, about 4cm 2 ) was weighed, immersed in the solution, taken out and placed into a pre-weighed weighing dish; weigh the weighing dish and blotting paper to determine the weight of the solution on the blotting paper. Save the weighing dish and blotter for further testing (step 9).
[0084] 4. A...
Embodiment 3
[0093] The ability of polyvinyl alcohol (PVA) to reduce the rate at which the potassium hydroxide electrolyte solution saturates the absorbent material was assessed by comparing the time required for each to be saturated with a 33 wt% potassium hydroxide solution compared to a saturated paper towel.
[0094] Three different types of PVA were tested: grades 70-62, 52-22 and 50-42 from E.I. duPont de Nemours & Co., Wilmington, Delaware, USA. 10 wt% PVA in water, made from each PVA material: About 10wt% crystalline PVA was dissolved in cold water and slowly heated to boiling under gentle stirring, and maintained for about 5 minutes after boiling, and the solution was cooled to room temperature under continuous stirring and partial vacuum. Each solution was applied to a sheet of tissue paper by first soaking the tissue in the liquid and then squeezing the soaked tissue dry to its original thickness.
[0095] Determine the time required for the potassium hydroxide solution to satur...
PUM
| Property | Measurement | Unit |
|---|---|---|
| True density | aaaaa | aaaaa |
| Apparent density | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More