Preparation method of lithium titanate cathode material with high tap density

A density lithium titanate and negative electrode material technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low tap density, affecting battery quality, and low specific energy of batteries, achieving high energy density and increasing The effect of high contact area and specific surface area

CN104953107AInactive Publication Date: 2015-09-30NORTHERN ALTAIR NANOTECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-09-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a lithium titanate cathode material with high tap density. The preparation method comprises the following steps: weighing a lithium source and a titanate source according to the mole ratio of Li to Ti being (0.80-0.85): 1, and taking deionized water as a medium; carrying out uniform stirring and spray drying; then, carrying out high-temperature calcination, wet ball-milling, secondary spray drying, secondary high-temperature sintering, and screening to obtain the lithium titanate cathode material. The lithium titanate cathode material obtained according to the preparation method has the advantages that the tap density can be improved to 1.2 g / cm<3> or above; lithium titanate particles obtained during the preparation are spherical, solid in structure and high in dispersity.
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Description

technical field

[0001] The invention relates to a preparation method of a high-tap density lithium titanate negative electrode material, and belongs to the technical field of electrochemical battery electrode raw materials. Background technique

[0002] Since the beginning of the 21st century, the global climate and environment have been deteriorating and oil resources have become increasingly scarce, making modern society face severe challenges. From the perspective of sustainable economic and social development, the traditional energy system is gradually hindering the development of economic and social development. It has become the development trend of energy utilization in the world to develop a safe and clean green energy system for people to use. Traditional lead-acid batteries and nickel-cadmium batteries have been difficult to meet the needs of the market due to problems such as low energy density and environmental pollution. With the advancement of science and techn...

Examples

Embodiment 1

[0033] A preparation method of a high tap density lithium titanate negative electrode material, comprising the steps of:

[0034] (1) Mixing of raw materials: Add 200L of deionized water into the mixing tank, mix according to the molar ratio of Li:Ti=0.81:1, weigh 30kg LiOH·H 2 O and 80kg TiO 2 Disperse in deionized water and stir for more than 2 hours to make it fully mixed.

[0035] (2) Spray drying: The uniformly stirred slurry is spray-dried to obtain a uniformly mixed powder.

[0036] (3) High-temperature calcination: heat up the roller sintering furnace according to the heating curve, load the spray-dried powder into the SiC sagger, and put it into the sintering furnace for calcination under the air atmosphere. The temperature in the holding zone is 850°C. The holding time is 4 hours, and then cooled naturally to obtain lithium titanate powder with high purity.

[0037] (4) Wet ball milling: add 0.2-1.0mm zirconia beads into the ball mill as the grinding medium, add l...

Embodiment 2

[0043] A preparation method of a high tap density lithium titanate negative electrode material, comprising the steps of:

[0044] (1) Mixing of raw materials: Add 250L of deionized water into the mixing tank, and weigh 26kg of Li according to the molar ratio of Li:Ti=0.82:1 2 CO 3 and 80kg TiO 2 Disperse in deionized water and stir for more than 2 hours to make it fully mixed.

[0045] (2) Spray drying: The uniformly stirred slurry is spray-dried to obtain a uniformly mixed powder.

[0046] (3) High-temperature calcination: heat up the roller sintering furnace according to the heating curve, load the spray-dried powder into the SiC sagger, and put it into the sintering furnace for calcination under the air atmosphere. The temperature in the holding zone is 850°C. The holding time is 4 hours, and then cooled naturally to obtain lithium titanate powder with high purity.

[0047] (4) Wet ball milling: add 0.2-1.0mm zirconia beads into the ball mill as the grinding medium, ad...

Embodiment 3

[0053] A preparation method of a high tap density lithium titanate negative electrode material, comprising the steps of:

[0054] (1) Add 200L of deionized water into the mixing tank, and weigh 24.5kg of LiNO according to the molar ratio of Li:Ti=0.82:1 3 and 80kg TiO 2 Disperse in deionized water and stir for more than 2 hours to make it fully mixed.

[0055] (2) Spray drying: The uniformly stirred slurry is spray-dried to obtain a uniformly mixed powder.

[0056] (3) High-temperature calcination: heat up the roller sintering furnace according to the heating curve, load the spray-dried powder into the SiC sagger, and put it into the sintering furnace for calcination under the air atmosphere. The temperature in the holding zone is 850°C. The holding time is 4 hours, and then cooled naturally to obtain lithium titanate powder with high purity.

[0057] (4) Wet ball milling: add 0.2-1.0mm zirconia beads into the ball mill as the grinding medium, add lithium titanate powder i...