Water-based batteries without explosive risks developed - lithium ion polymer battery
Scientists developed a water for the first time. based lithium-
Ion batteries for household electronics, such as laptops with lower risk of fire or explosion.
"In the past, if you want high energy, you will choose non-Lithium water-
Ion batteries, but you have to compromise on safety, "said Kang Xu, a lab researcher at the US Army Research Laboratory.
Scientists developed a water for the first time. based lithium-
Ion batteries for household electronics, such as laptops with lower risk of fire or explosion.
"In the past, if you want high energy, you will choose non-Lithium water-
Ion batteries, but you have to compromise on safety, "said Kang Xu, a lab researcher at the US Army Research Laboratory.
"If you prefer safety, you can use water batteries like nickel/metal hydroxide, but you have to be content with lower energy," Xu said . ".
"Now, we show that you can get high energy and high safety at the same time," Xu said . ".
The study followed a study that produced 2015 of the same 3.
0 V battery with water electrolyte but by so-
Known as the "cathode challenge" where one end of a battery made of graphite or lithium metal is degraded by a water electrolyte.
To solve this problem and achieve a leap from 3 V to 4 V, the researchers designed a new gel polymer electrolyte coating that can be applied to graphite or lithium anode.
This hydrophobic coating removes water molecules from the vicinity of the electrode surface and then breaks down and forms a stable interface on the first charge-
A thin mixture of decomposition products that separate the solid anode from the liquid electrolyte.
This interface is inspired by layers not generated internally
Water batteries, which protect the anode from destructive side reactions, allow the battery to use ideal anode materials such as graphite or lithium metal and achieve better energy density and cycle capacity.
"The key innovation here is to make the right gel that can stop the water from coming into contact with the anode so that the water does not break down and can also form the right interface to support high battery performance, wang Chunsheng, a professor at the University of Maryland at UA, said.
The addition of gel coating also enhances the safety advantage of new batteries compared to standard non-batteries
Lithium water-
Compared to any other proposed lithium water, the ion battery and increased the energy densityion batteries.
Lithium water-
Ion batteries benefit from the flammable nature of water
Unlike highly flammable organic solvents used in non-flammable organic solvents
Water counterpart.
This is unique, however, even if the interface layer is damaged (
For example, if the battery case is punctured)
, It reacts slowly with lithium or lithium graphite anode, preventing smoking, fire or explosion that may occur if the damaged battery makes the metal in direct contact with the electrolyte.
Although the power and energy density of the new battery is suitable for commercial applications currently served by more dangerous non-batteries
Some improvements to the water battery will make it more competitive.
In particular, the researchers hope to increase the full-
The battery can complete the performance cycle and reduce the material cost if possible.
"Now, we're talking about 50-
"100 cycles, but we want to reach 500 or more than organic electrolyte batteries," Wang said . ".
The researchers also pointed out that in battery technology and other fields, it is very important to jump to the electrochemical operation behind the four volts.
"This is the first time we have been able to stabilize active anode like graphite and lithium in the water medium," Xu said . ". .