Lithium ion battery, cathode sheet thereof, cathode material and preparation process

Abstract

The invention belongs to the field of lithium ion batteries and discloses a lithium ion battery, a cathode sheet thereof, a cathode material, and a preparation process. The cathode material comprisesa cathode active material, a conductive agent, lithium lanthanum-zirconium oxide, and a binder; the mass percentages of the cathode active material, the conductive agent, the lithium lanthanum-zirconium oxide and the binder are 95%-6%, 0.2%-0.6%, 0.2%-0.6%, and 2.8%-3.4% respectively. With the technical schemes of the invention adopted, the improvement of low temperature performance of the lithiumion battery can be benefitted.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery, a negative electrode sheet, negative electrode materials and a preparation process thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of long cycle life, high energy density, high specific capacity and no pollution, which has aroused extensive interest of researchers. In the context of energy crisis and global warming, lithium-ion secondary batteries have become one of the research hotspots as a new type of clean energy. Since the first commercialization of lithium-ion batteries in 1991, lithium-ion batteries have been widely used in 3C digital and power vehicles and other fields. At present, the mainstream battery anode materials are mainly lithium iron phosphate and ternary materials, while graphite has always occupied the absolute position of anode materials because of its small volume expansion coefficient, lith...

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Problems solved by technology

The inventor found in the research of the present invention that the boric acid introduced in the lithium tetrafluoroborate salt added in the prior art will corrode the base material of the battery, which may cause its side reaction to the battery; in addition, The fluoroethylene carbonate introduced in this reference document leads to a great increase in the cost of the electrolyte

[0007] In addition, in the patent CN201010289760.0, it is disclosed that lithium cobalt oxide with a maximum mass dosage of 10% is added to the lithium iron phosphate material. The inventor found in the research of the present invention that the application of this patented technology not only increases the cost , and it is not conducive to environmental protection; moreover, the discharge platforms of lithium iron phosphate and lithium cobalt oxide are inconsistent. At low temperatures, lithium cobalt oxide discharges electricity first, and the amount of lithium cobalt oxide added is limited, and its discharge capacity will still be limited at low temperatures. , cannot effectively solve the problem of low temperature

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