Manufacturing method for high-voltage lithium ion anode material

Abstract

The invention provides a manufacturing method for a high-voltage lithium ion anode material. A lithium battery manufactured with the preparation method can be quickly recharged and discharged, and the recharging cut-off voltage is increased to 4.35V, so that the energy density of the lithium battery is greatly increased. The anode material manufactured with the manufacturing method takes lithium titanate as a core, the surface of lithium titanate is uniformly coated with a layer of graphite, and the surfaces of lithium titanate particles coated with the graphite are further coated with a layer of conductive agent, as a result, a lithium titanate-graphite-conductive agent three-layer composite structure is formed. The manufactured battery has very good performance of quick recharging and discharging and is greatly improved in high and low temperature performance and safety.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode materials, in particular to a preparation method of a fast chargeable high voltage lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. They have been widely used in mobile phones, notebook computers, power tools and other fields. And gradually promote in the field of electric vehicles. At present, Beijing, Tianjin, Shenzhen, Shanghai and other important cities in China have built charging stations for hybrid electric vehicles and pure electric vehicles. However, according to the current charging method of lithium batteries, electric vehicles often take 7-8 hours to charge at a time; while consumer electronic products such as mobile phone...

AI Technical Summary

Problems solved by technology

[0003] In recent years, some studies have achieved the purpose of fast charging by setting a number of regular small holes on the positive electrode sheet, but the actual application of this method consumes more materials and time; some studies have used lithium titanate, lithium metal oxide coated graphite, composite type Lithium metal oxide-coated graphite, graphite-coated lithium titanate and other materials are used as negative electrodes to achieve fast charging effects, but there are problems such as low energy density of lithium titanate and low conductivity of lithium metal oxide, while lithium titanate The rate performance is poor, the battery cell is easy to produce gas, and the high temperature performance is poor

And the current research on fast charging shows that the charging cut-off voltage of the battery cell is only 4.2V, and the energy density is low.

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