Battery
A battery and electrolyte technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve problems such as reduced discharge capacity and reduced cycle performance, and achieve the effects of improving battery performance, preventing reactions, and improving deposition-dissolution efficiency.
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Example
[0098] (Examples 1-1 to 1-25)
[0099] A battery in which the area density ratio of the cathode 21 and the anode 22 has been adjusted is formed. The capacity of the anode 22 includes the capacity component obtained by the insertion and extraction of lithium and the capacity component obtained by the deposition and dissolution of lithium, and is expressed by the sum of the two .
[0100] First, according to the ratio (molar ratio) Li 2 CO 3 : CoCO 3 =0.5:1 mixed lithium carbonate (Li 2 CO 3 ) And cobalt carbonate (CoCO 3 ), the mixture was sintered at 900°C for 5 hours in the air to obtain a lithium cobalt composite oxide (LiCoO 2 ) As a cathode material. Next, 91 parts by weight of lithium cobalt composite oxide, 6 parts by weight of graphite as a conductor, and 3 parts by weight of polyvinylidene fluoride as a binder were mixed to prepare a cathode mixture. Then, the cathode mixture was dispersed in N-methyl-2-pyrrolidone as a solvent to produce a cathode mixture slurry. After th...
Example
[0118] (Examples 2-1 to 2-4)
[0119] The formation of the secondary batteries of Examples 2-1 to 2-4 is basically the same as that of Examples 1-1 and 1-3, except that vinylene carbonate (VC) or vinyl ethylene carbonate is an unsaturated compound carbonate. The ethyl ester (VEC) is added to a mixture of 50% by volume of ethylene carbonate and 50% by volume of diethyl carbonate. The mass content of vinylene carbonate or vinyl ethylene carbonate in the solvent is 1%.
[0120] As in the case of Example 1-1, in the secondary batteries of Examples 2-1 to 2-4, cycle performance and heavy load performance were determined, and it was checked whether lithium metal was deposited under fully charged conditions and fully discharged conditions. The results are shown in Table 3 together with the results of Examples 1-1 and 1-3 and Comparative Examples 1-1 to 1-3.
[0121] Shown in chemical formula 1
[0122] It is obvious from Table 3 that in the secondary batteries using two unsat...
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