A cathode material, a lithium ion battery including the same and a preparing method of the lithium ion battery

Abstract

A cathode material is disclosed. The cathode material comprises lithium vanadium phosphate and a lithium ion battery cathode active compound. According to the cathode material, through blending the lithium vanadium phosphate and the lithium ion battery cathode active compound, present secondary lithium ion battery cathode materials are greatly improved, and characteristics of a high energy density, low-temperature discharging, high-current discharging and high-temperature safety of secondary lithium ion batteries are taken into account. In addition, a lithium ion battery including the cathode material is also disclosed. The lithium ion battery has a high energy density, a high voltage platform, long cyclic service lifetime, excellent low-temperature performance and good rate charge-discharge performance, and can meet energy density requirements of digital products and high-current charge-discharge requirements of electric tools. In addition, a preparing method of the lithium ion battery is also provided.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to a positive electrode material, a lithium ion battery containing the positive electrode material and a preparation method thereof. Background technique [0002] LiCoO is currently the most researched lithium-ion battery cathode material. 2 (a-NaFeO 2 type layered structure), lithium nickelate (a-NaFeO 2 type layered structure), nickel-cobalt lithium manganate ternary material (a-NaFeO 2 type layered structure), spinel type lithium manganese oxide, lithium iron phosphate (olivine type structure), etc. [0003] The most widely used in the power battery and energy storage industry is the use of lithium iron phosphate and nickel-cobalt lithium manganese oxide ternary materials as the positive electrode material for secondary lithium-ion batteries. But LiFePO 4 The main disadvantage of the material is that the theoretical capacity is not high and the conduc...

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Problems solved by technology

But LiFePO 4 The main disadvantage of the material is that the theoretical capacity is not high and the conductivity at room temperature is low, which leads to poor low-temperature characteristics and low energy density of the battery of the corresponding system; although the nickel-cobalt-lithium manganese oxide ternary material has high theoretical gram capacity, high energy density, and compact High density, but relatively poor safety at low and high temperatures

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