Lithium ion power cell and its preparation method

Abstract

The invention discloses a lithium ion power cell and its preparation method. An anode material of the lithium ion power cell is made from the following raw materials of: by weight, 83-95% of lithium titanate, 2-10% of a binder and 3-10% of a conductive agent. A cathode material of the lithium ion power cell is made from the following raw materials of: by weight, 83-95% of lithium iron phosphate, 2-10% of the binder and 3-12% of the conductive agent. According to the lithium ion power cell, lithium titanate is used as the active substance of the anode and lithium iron phosphate is used as the active substance of the cathode. The cell provided by the invention has large capacity, excellent charge-discharge rate, long cycle life and high volumetric specific energy. The preparation method provided by the invention requires low cost, and the technology is simple and easy to perform.

Description

technical field [0001] The invention relates to a lithium ion power battery and a preparation method thereof. Background technique [0002] The world's energy and environmental protection situation is becoming increasingly tense, and batteries are increasingly favored by people as a new energy source. Due to its high energy density, light volume, small weight, environmental protection and pollution-free, lithium-ion batteries have become the main direction of new energy development. With the rapid development of electric vehicles, space technology, national defense industry, and power storage systems, higher requirements are put forward for the specific capacity, cycle life, and safety of secondary batteries, and the electrochemical performance of batteries is improved. It can start with electrode materials and other aspects. [0003] Traditional lithium-ion batteries all use graphite as the main active material of the negative electrode material. The formulation of graph...

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Problems solved by technology

[0005] The positive electrode material is also an important part of lithium-ion power batteries. The first positive electrode material industrialized by Sony mainly uses lithium cobalt oxide (LiCoO 2 ), and now because cobalt resources are becoming more and more scarce, its price is getting higher and higher, and its thermal stability is poor, and it also has a greater destructive effect on the environment. Therefore, more and more researchers and engineers will Attention has been turned to other cathode materials, and LiNiO is the cathode material that has attracted much attention for lithium-ion power batteries. 2 , LiMn 2 o 4 etc., LiNiO 2 The capacity is large, but it is difficult to prepare, it is difficult to obtain a relatively pure substance, and its safety performance is not good; LiMn 2 o 4 The price is relatively cheap, and the safety performance is good. However, its cycle performance is poor, the capacity is not high, and the high temperature performance is not good. LiFePO 4 It does not contain precious elements, the raw materials are cheap, and the resources are extremely rich; the working voltage is moderate, the voltage is relatively stable, the theoretical capacity is large, the structure is stable, and the safety performance is also good. It is an ideal cathode material

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