A method for improving the capacity of 1.55v carbon-coated lithium titanate battery

Abstract

The invention discloses a method for improving the capacity of a 1.55V carbon-coated lithium titanate battery, which is a high-temperature furnace under an argon atmosphere after grinding and mixing a certain proportion of lithium hydroxide, titanium oxide, terbium oxide and glucose uniformly. Calcination in middle temperature for 5-10 hours, the calcination temperature is 700-900°C, after natural cooling, pulverize and sieve to obtain lithium titanate negative electrode material Li coated with C 0.99 Tb 0.01 Li 1 / 3 Ti 5 / 3 o 4 . The capacity of the 1.55V lithium titanate battery synthesized by the hydrothermal reaction of the present invention is 252mAh / g.

Description

technical field [0001] The invention relates to a lithium titanate battery, and in particular provides a method for increasing the capacity of a 1.55V carbon-coated lithium titanate battery. Background technique [0002] In the 1990s, lithium titanate Li 4 Ti 5 o 12 Appearing as the anode material of a new type of lithium battery, it has been valued due to its high safety, high stability, long life and green environmental protection. As far as the currently used lithium titanate battery is concerned, lithium titanate is used as the negative electrode material instead of graphite, and it can be combined with lithium manganate, ternary materials or lithium iron phosphate and other positive electrode materials to form a 2.4V or 1.9V lithium ion secondary battery. Lithium titanate battery has obvious advantages, but its shortcomings are also obvious, such as relatively low energy density and weak battery life, which is largely determined by the voltage of the single battery. ...

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Problems solved by technology

The technology of these open literature record is that the capacity of battery is high on the surface, but the method that takes is all the method of palliative, not the root cause, in reality these methods have the following problems: the one, although the capacity of battery is high, but with The loss of other performances of the battery is at the expense of, for example, after doping with silicon, the number of cycles of the composite battery is greatly reduced, resulting in a shortened battery life; second, the capacity of the battery is high, and the safety of the battery is affected by the unsafe silicon material. Sex down

According to the common knowledge in this field, the voltage of the lithium titanate battery synthesized by this mechanism is below 1.5, so the literature can not improve the capacity of the 1.55V lithium titanate battery

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