POLYCRYSTALLINE COBALT-NICKEL-MANGANESE TERNARY POSITIVE MATERIAL, PREPARATION METHOD THEREOF AND LITHIUM ION SECONDARY BATTERY

• Main Authors: ZHAO, XIAOLIAN, XIANG, QIANXIN
• Format: Patent
• Language: Chinese; English; French
• Published: 12.05.2011
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A polycrystalline cobalt-nickel-manganese ternary positive material is provided. The polycrystalline cobalt-nickel-manganese ternary positive material comprises more than two basic crystalline structures of LizCoO2?LizNiO2?LizMnO2?LizCo1-(x+y)NixMnyO2?LizNixMn1-xO2?LizCoxNi1-xO2 and Li2MnO3. Further, a method for preparing the positive material by high-temperature fusion is provided. The positive material has the compacted density of 3.9-4.3 g/cm3, the capacity of 145 mAh/g or more when the discharging rate is 0.5-1C and the capacity retention rate of more than 90% after 300 cycles. The positive material prepared by high-temperature fusion has high volume energy density, excellent electrochemical performance, and improved safety and is manufactured economically. Further, a lithium ion secondary battery comprising the positive material is provided. La présente invention a trait à un matériau positif ternaire de cobalt-nickel-manganèse polycristallin. Le matériau positif ternaire de cobalt-nickel-manganèse poly