Abstract:
A method for charging a secondary cell comprising positive and negative electrodes both containing a material capable of absorbing/releasing lithium and a binder polymer, at least one separator for isolating the positive and negative electrodes from each other, and a nonaqueous electrolyte containing a lithium salt. Charging patterns Pn[Xn, tn], Pn+1[Xn+1, tn+1], Pn+2[Xn+2, tn+2], Pn+3[Xn+3, tn+3] (n is an integer of one or more) for each of which the current value (X amperes, X >= 0 ampere) and the charging time (t seconds, t <> 0 second) are specified are combined in order of mention to charge the secondary cell. The current values (X amperes) of consecutive two charging patterns (P) are different from each other. The current values Xn+2, Xn of the charging pattern Pn[Xn, tn], Pn+2[Xn+2, tn+2] are Xn+2
Abstract:
A nonaqueous secondary cell comprising positive and negative plates both containing a material that stores and releases lithium ions and a binder polymer, one or more separators for separating the positive and negative plates from each other, and a nonaqueous electrolyte containing a lithium salt and an organic solvent, wherein a material that is oxidized at the positive plate at a cell voltage of a potential of 4.1 to 5.2 V is added to the electrolyte, and the material is subjected at the positive plate to oxidation different from the lithium releasing reaction, whereby the overcharging characteristics and the safety of the nonaqueous electrolyte cell can be improved.
Abstract:
A compound reductively decomposed at a potential (+1.0 V v.s. potential above Li/Li ) higher than by 1.0 V than the equilibrium potential of metallic lithium and lithium ion is added to an electrolytic solution of a secondary cell. Even if propylene carbonate is used as the organic electrolyte, it is not decomposed on the negative electrode. The cycle properties, the capacitance, and the low temperature characteristics of the cell are improved.
Abstract translation:在二次电池的电解液中加入在比金属锂和锂离子的平衡电位高1.0V以上的电位(+1.0V V·以上的Li / Li +以上)还原分解的化合物。 即使使用碳酸丙烯酯作为有机电解质,也不会在负极上分解。 电池的循环特性,电容和低温特性得到改善。
Abstract:
A polymer gel electrolyte-use composition containing a pregel composition having a viscosity at 20 DEG C of up to 100 cP is impregnated into a battery structure containing an anode, cathode and separator or an electric double-layer capacitor structure, thereby making it possible to quickly and uniformly impregnate a polymer gel electrolyte-use composition into a battery structure or the like and provide a battery and capacitor excellent in cycle characteristics.