Electrolyte for rechargeable lithium battery and rechargeable lithium battery comprising the same
Inactive Publication Date: 2003-04-01
SAMSUNG SDI CO LTD
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However, crystalline carbon, has a lower charge capacity than low crystalline carbon.
In other words, low crystalline carbon has relatively higher charge capacity than crystalline carbon, but possesses the disadvantage of having extremely high irreversible charge and discharge properties.
However, propylene carbonate has various disadvantages such as a high viscosity.
Furthermore, when crystalline negative active materials such as graphite are used together with propylene carbonate, propylene carbonate dissolves as it is inserted into between negative active material layers, thereby generating propylene gas and lithium carbonate which cause a decrease in capacity and an increase irreversible capacity during charging.
However, ethylene carbonate has a high viscosity and a high melting point of about 36.degree. C. such that low temperature characteristics are not obtained.
In addition, chain carbonate has a low reactivity with lithium.
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An electrolyte for a rechargeable lithium battery is provided. The electrolyte includes a non-aqueous organic solvent and a lithium salt. The non aqueous organic solvent includes cyclic carbonate such as ethylene carbonate and propylene carbonate, chain carbonate such as dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate, and alkyl acetate such as n-methyl acetate, n-ethyl acetate and n-propyl acetate. The electrolyte can be used in a rechargeable lithium battery to provide good low temperature characteristics and safety.
Description
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