Wholesale Lithium Battery Pack 12V 200AH Can With LCD Control
| species |
Lithium Iron Phosphate |
Voltage | 32700-12V |
capacity | 200AH |
Batteries | IFR32700 3.2V 6Ah |
size | 521*238*218mm |
weight | 24KG |
Maximum charging current | 100A |
Maximum discharge current | 150A
|
Display screen | No |
Communication support | No |
The phone battery has been charged for more than a week, and it
only takes 15 minutes to charge each time. Researchers at
Northwestern University in United States have brought us one step
closer to that dream. According to a report by the United States
Physicists Organization Network on November 15 (Beijing time),
engineers at the university have developed an electrode for
lithium-ion batteries, allowing the battery to retain 10 times more
power than the existing technology, and can increase the charging
rate of batteries with new electrodes by 10 times. The study was
published in the recent issue of the journal Advanced Energy
Materials. Storage capacity and charging rate are two important
battery limitations. The amount of stored power is limited by the
charge density, which is how much lithium can be held at the two
poles of the battery. The charging rate is limited by the speed at
which lithium ions can reach the negative electrode from the
electrolyte.
The negative electrode of existing lithium-ion batteries is made of
carbon-based graphene sheets, and one lithium atom can only fit six
carbon atoms. In order to increase the amount of stored
electricity, scientists have tried to use silicon instead of
carbon, so that silicon can adapt to more lithium, so that 4
lithium atoms correspond to 1 silicon atom. However, silicon
expands and shrinks significantly during charging, causing rapid
cracking and loss of charging capacity. The shape of the graphene
sheets also restricts the charging rate of the battery, and
although they are only one carbon atom thick, they are very long.
Since it takes a long time for lithium to move to the middle of the
graphene sheet, ionic traffic jams often occur at the edges of the
graphene sheet.
Now, the research team has solved these problems by combining two
technologies. First, in order to stabilize the silicon to maintain
the maximum charging capacity, they added silicon clusters between
the graphene sheets, and used the elasticity of the graphene sheets
to cooperate with the change in the number of silicon atoms in the
use of the battery, so that a large number of lithium atoms were
stored in the electrodes. The addition of silicon clusters results
in higher energy density while also reducing the loss of charging
capacity due to silicon expansion and shrinkage, giving you the
best of both worlds.
The team also used a chemical oxidation process to create 10
nanometer to 20 nanometer micropores on the graphene sheet, known
as surface defects, so that lithium ions will follow this shortcut
to the negative electrode, where they will react with silicon and
store at the negative electrode. This will reduce the charging time
of the battery by a factor of 10.
