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When a battery is charged, positive lithium ions rush to meet electrons on the negative electrode. These lithium ions fit within the electrode.
Researchers have developed a new way to microscopically view battery(such as Accu Pavilion dv9000 ) electrodes while they are bathed in wet electrolytes, mimicking realistic conditions inside actual batteries.
The research revealed that many aspects of battery can be studied under dry conditions, which are much easier to use. However, wet conditions are required to examine the hard-to-locate solid electrolyte interphase layer, a coating that accumulates on the electrode's surface and dramatically influences battery performance.
When the researchers charged the battery(such as Accu Evo N160 ), they saw the silicon electrode swell, as expected. However, under dry conditions, the electrode is attached at one end to the lithium source - and swelling begins at just one end as the ions advance their way in, creating a leading edge.
The layer is perceived to have peculiar properties and to influence the charging and discharging performance of the battery," Wang said in a news release. "However, researchers don't have a concise understanding or knowledge of how it forms, its structure, or its chemistry. Also, how it changes with repeated charging and discharging remains unclear. It's very mysterious stuff. We expect the liquid cell will help us to uncover this mystery layer."
Wang and his colleagues created a wet battery(such as Accu Armada V500 ) cell in a transmission electron microscope at the DOE's Environmental Molecular Sciences Laboratory. The researchers developed a battery so tiny that several could be placed on a dime. The battery contained one silicon electrode and one lithium metal electrode, both held in a bath of electrolyte.
Researchers have developed a new way to microscopically view battery(such as Accu Pavilion dv9000 ) electrodes while they are bathed in wet electrolytes, mimicking realistic conditions inside actual batteries.
The research revealed that many aspects of battery can be studied under dry conditions, which are much easier to use. However, wet conditions are required to examine the hard-to-locate solid electrolyte interphase layer, a coating that accumulates on the electrode's surface and dramatically influences battery performance.
When the researchers charged the battery(such as Accu Evo N160 ), they saw the silicon electrode swell, as expected. However, under dry conditions, the electrode is attached at one end to the lithium source - and swelling begins at just one end as the ions advance their way in, creating a leading edge.
The layer is perceived to have peculiar properties and to influence the charging and discharging performance of the battery," Wang said in a news release. "However, researchers don't have a concise understanding or knowledge of how it forms, its structure, or its chemistry. Also, how it changes with repeated charging and discharging remains unclear. It's very mysterious stuff. We expect the liquid cell will help us to uncover this mystery layer."
Wang and his colleagues created a wet battery(such as Accu Armada V500 ) cell in a transmission electron microscope at the DOE's Environmental Molecular Sciences Laboratory. The researchers developed a battery so tiny that several could be placed on a dime. The battery contained one silicon electrode and one lithium metal electrode, both held in a bath of electrolyte.