Water-based replacement for lithium-ion batteries. Free Technical Library News

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Water replacement for lithium-ion batteries

21.10.2023

Scientists at the Korea Institute of Science and Technology (KIST) are proposing a shift from lithium-ion batteries to aqueous batteries, which promise to be safe, efficient and more environmentally friendly.

Lithium-ion batteries, despite their widespread use, face problems with explosion hazards and high costs, as well as negative environmental impacts. Researchers at KIST propose using water batteries as a safer and more affordable alternative.

Aqueous batteries use water-based solutions instead of traditional organic solvents, making them safer and more economical. However, there is a problem with dendrites and corrosion of metal deposits, which can impair the performance and safety of batteries.

The researchers solved this problem by creating a composite catalyst made from manganese dioxide and palladium. This catalyst is capable of absorbing hydrogen, thereby preventing internal pressure and ensuring the safety of the battery. This solution also reduces electrolyte wear and ensures long battery life.

Water batteries promise to be safer, more affordable, greener and longer lasting, making them a promising option for the future of energy storage.

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Chip ST25DV02K-W for controlling lights and motors 20.03.2020

STMicroelectronics has released a new series of ST25DV-PWM 13,56 MHz dynamic NFC/RFID tags compatible with NFC phones and professional readers. The series includes ST25DV02K-W1/W2 chips, which differ in the number of PWM outputs (PWM).

The two PWM outputs of the ST25DV02K-W2 can be independently and safely programmed, allowing the NFC chip to be used in devices where smooth analog parameter changes are required. The chip provides real-time PWM parameter updates using a contactless interface through a regular smartphone, which expands the user's ability to control devices without the usual interface in the form of buttons and a display.

The ST25DV02K-W1/2 is an ISO 15693 and NFC Forum Type 5 tag with one or two pulse-width modulation (PWM) outputs and 2 kbit electrically erasable programmable memory (EEPROM). The microcircuit has two interfaces. The first provides up to two independent PWM outputs, and the second is an RF channel activated by the electromagnetic field of the NFC reader. PWM outputs are configurable at boot time and can be updated in real time via RF. The NFC part and PWM drivers are powered separately and can work independently - settings can be written to the chip even if the device is not connected to power and is in the package.

ST25DV02K-W1/2 contains 256 bytes (64 blocks) of memory for user data. This memory is accessed via RF interface as recommended by ISO/IEC 15693 or NFC Forum Type 5 Tag. The device is based on technology and design solutions protected by patents. The manufacturer guarantees the availability of chips for at least 10 years.

Особенности ST25DV02K-W1/ST25DV02K-W2:

One or two PWM outputs (4 mA) from 488 to 31250 Hz;
PWM resolution 62,5 nS (9 to 15 bits depending on frequency);
Accuracy: +-10% in temperature range;
No need for an external generator;
Supply voltage from 1,8 V to 5,5 V;
ISO/IEC 15693 radio interface and NFC Forum Type 5 Tag;
EEPROM memory 2 kbit (5 ms block write);
Data retention: 40 years (100k write cycles at 85°C);
Data protection: four areas (including PWM), with password protection;
Digital signature mechanism for TruST25 authentication;
Temperature range -40°C to 105°C (PWM interface);
SO-8 and TSSOP-8 ECOPACK2 enclosures (RoHS compliant).

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