Composite cathode material lithium ion battery

Abstract

The invention discloses a lithium ion cell of a compound cathode material. A polar plate unit consists of an anode, a spacing membrane and a cathode; the anode is sealed in the bag of the spacing membrane; the cathode comprises the compound material of lithium titanate and black lead. The bag of the spacing membrane provided with the anode and the cathode are spaced by another layer of spacing membrane; an 'S'-shaped lamination mode is adopted; or the bag of a double-layer spacing membrane provided with the anode and the cathode are directly overlapped. The width of the cathode is equal to the width of the bag of the spacing membrane. The cathode comprises the following material components as per weight percentage: 80 to 87 portions of the compound material of lithium titanate and black lead, 4 to 7 portions of adhesive, 6 to 7 portions of conductive agent as well as 3 to 6 portions of liquid imbibing agent. The compound material of lithium titanate and black lead comprises the following components as per weight percentage: 85 to 90 portions of lithium titanate as well as 10 to 15 portions of black lead. The compound material of lithium titanate and black lead is manufactured by a mechanical alloy method. The lithium ion cell of a compound cathode material has simple structure, is easy to be processed and manufactured, is safer and is suitable for electric motor cars and special power sources.

Description

technical field [0001] The invention relates to a chemical power source, more specifically, it relates to a lithium-ion battery adopting a new process manufacturing method, and the negative electrode material is lithium titanate and graphite composite material. Background technique [0002] Ordinary lithium-ion battery carbon anode materials have some obvious disadvantages: it is easy to react with the electrolyte, which reduces the first Coulombic efficiency; the precipitation of lithium dendrites causes the battery to short circuit, causing safety problems. The use of lithium titanate composite materials has two most prominent advantages: one is that the charging curve of the battery is flat, and the voltage rises significantly at the end of charging, which has an obvious indication function; the other is that the battery can be charged quickly with high current and high rate. In addition, common high-capacity lithium-ion batteries on the market are generally formed by sta...

AI Technical Summary

Problems solved by technology

[0002] Common lithium-ion battery carbon anode materials have some obvious disadvantages: it is easy to react with the electrolyte, which reduces the first Coulombic efficiency; the precipitation of lithium dendrites causes the battery to short-circuit, causing safety problems

So far, no lithium-ion battery made of lithium titanate composite negative electrode material using the positive electrode pocket packaging process has been seen in the market.

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