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    • 4. 发明授权
    • Additives for non-aqueous electrolyte and lithium secondary battery using the same
    • 非水电解质和锂二次电池用添加剂
    • US07927747B2
    • 2011-04-19
    • US11623845
    • 2007-01-17
    • Ho Chun LeeSun Sik ShinHong Kyu ParkJoo Mi JeonJeong Ju Cho
    • Ho Chun LeeSun Sik ShinHong Kyu ParkJoo Mi JeonJeong Ju Cho
    • H01M6/16H01M6/04
    • H01M10/0525H01M10/0567H01M10/4235H01M2300/0025
    • Disclosed is an electrolyte for batteries, comprising: (a) an electrolyte salt; (b) an organic solvent; (c) a first compound having an oxidation initiation voltage (vs. Li/Li+) higher than the operating voltage of a cathode; and (d) a second reversible compound having an oxidation initiation voltage higher than the operating voltage of the cathode, but lower than the oxidation initiation voltage of the first compound. Also disclosed is a lithium secondary battery comprising said electrolyte. In the lithium secondary battery, two compounds having different safety improvement actions at a voltage higher than the operating voltage of the cathode are used in combination as electrolyte components. Thus, the safety of the secondary battery in an overcharged state can be ensured, and at the same time, the deterioration of the battery can be prevented from occurring when it is repeatedly cycled, continuously charged and stored at high temperature for a long time.
    • 公开了一种用于电池的电解质,其包括:(a)电解质盐; (b)有机溶剂; (c)具有高于阴极的工作电压的氧化起始电压(相对于Li / Li +)的第一化合物; 和(d)具有高于阴极的工作电压但低于第一化合物的氧化起始电压的氧化起始电压的第二可逆化合物。 还公开了包含所述电解质的锂二次电池。 在锂二次电池中,作为电解质成分组合使用具有比阴极的工作电压高的电压具有不同安全性改善作用的两种化合物。 因此,可以确保二次电池处于过充电状态的安全性,并且同时可以防止在重复循环,连续充电并长时间在高温下储存时发生电池的劣化。
    • 5. 发明授权
    • Lithium secondary battery with improved energy density
    • 具有提高能量密度的锂二次电池
    • US08703340B2
    • 2014-04-22
    • US13201385
    • 2010-02-16
    • Hong Jeong KimCha Hun KuSoo Ryoung KimHong Kyu Park
    • Hong Jeong KimCha Hun KuSoo Ryoung KimHong Kyu Park
    • H01M4/88H01M4/13H01M4/58
    • H01M10/052H01M4/364H01M4/505H01M4/525
    • Provided is a lithium secondary battery with enhanced energy density including a cathode using a cathode active material containing lithium mixed transition metal oxide absorbing and discharging lithium ions, wherein a final discharge voltage is in the range of about 1.5 V to about 2.75 V. A final discharge voltage can be reduced to 1.5 V to 2.75 V from 3.0 V by using various lithium mixed transition metal oxides as a cathode active material, or by using the various lithium mixed transition metal oxides with the LCO-based cathode material mixed. Compared to typical LCO-based cathode materials of which capacity and energy density do not change even if a final discharge voltage is decreased, a cathode material of the present invention results in further improving capacity by 10-20% as the final discharge voltage is decreased.
    • 提供了具有增强的能量密度的锂二次电池,包括使用吸收和放出​​锂离子的锂混合过渡金属氧化物的阴极活性材料的阴极,其中最终放电电压在约1.5V至约2.75V的范围内。最终 通过使用各种锂混合过渡金属氧化物作为正极活性物质,或通过混合各种锂混合过渡金属氧化物与LCO-阴极材料混合,放电电压可以从3.0V降低至1.5V至2.75V。 与其最终放电电压降低时容量和能量密度也不变化的典型的LCO阴极材料相比,本发明的阴极材料随着最终放电电压的降低而进一步提高10-20%的容量 。