Lithium ion secondary battery

• Main Authors: LIU ENXIN, PENG ZHUO
• Format: Patent
• Language: English
• Published: 09.09.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a lithium ion secondary battery which comprises a positive plate and a negative plate, wherein the positive plate is prepared from mixture of modified nickel-cobalt binary (LiNiXCoYW<1-X-Y>O2) and modified lithium iron phosphate(LiFeXR<1-X>PO4), graphitized carbon black (Super-P), conductive graphite (KS-6), polyvinylidene fluoride binder (PVDF) and 1-methyl-2-pyrrolidinone (NMP), the mixture of modified nickel-cobalt binary (LiNiXCoYW<1-X-Y>O2) and modified lithium iron phosphate(LiFeXR<1-X>PO4) is marked as (LiNiXCoYW<1-X-Y>O2+LiFeXR<1-X>PO4), the mass ratio of (LiNiXCoYW<1-X-Y>O2+LiFeXR<1-X>PO4) to Super-P to KS-6 to PVDF to NMP is (90-93) to (3-4) to 1 to (3-5) to 100, the mass ratio of LiNiXCoYW<1-X-Y>O2 to LiFeXR<1-X>PO4 is any one of 4 to 6, 5 to 5, 6 to 4, 7 to 3, and 8 to 2, in LiNiXCoYW<1-X-Y>O2, X is within the range of 0.4-0.8, Y is within the range of 0-0.6, W is any one of Zr, Al, Mg, Mn, Ti and Cr, in LiFeXR<1-X>PO4, X is within the range of 0.5-1, R is any one of Ni, Mg, Mn, Co, Ti and Cr.