Titanium-series cathode active material and preparation method thereof, titanium-series lithium ion power battery

A technology of negative electrode active material and power battery, which is applied in the field of titanium series negative electrode active material and its preparation, and titanium series lithium ion power battery field, can solve the problems of poor product consistency, no charging end indication, low volume specific capacity, etc. The effect of wide temperature range, good battery processing performance and high volume specific capacity

Active Publication Date: 2009-02-25
BTR NEW MATERIAL GRP CO LTD
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Problems solved by technology

Lithium-ion batteries of the prior art are used as power batteries for electric vehicles, and have the following deficiencies: (1) the problem of fast charging is very prominent. During the braking process, the braking process is short, generally no more than 10s, and the motor needs a large instantaneous current to effectively brake and recover energy. In theory, 50-60% of the braking energy of the car can be recovered, but the actual recovered braking Energy <20%, the discharge rate of existing lithium-ion batteries, especially the charge rate is difficult to meet the basic requirements of fast charging and fast discharging of electric vehicles
(2) Safety is the key factor for the practicality of vehicle-mounted lithium-ion batteries. Safety issues restrict the development of power batteries. The safety of positive and negative electrode materials for lithium-ion batteries in the prior art is low, mainly for the following four reasons: a. traditional lithium LiCoO is the positive electrode material for ion rechargeable batteries 2 , Graphite is the negative electrode material, and the positive electrode material will decompose and release oxygen at about 150 ° C, and react with the electrolyte, resulting in abnormal heating; b. The intercalation potential of lithium ions in the carbon-based material is close to the reduction potential of metal lithium; c. It cannot be charged and discharged at a large rate; d. There is no indication of the end of charging on the voltage curve, which is not suitable for power batteries for electric vehicles
Lithium titanate has the following disadvantages when used as a negative electrode material: 1. Low capacity, low bulk density, low compaction density, and low volume specific capacity; 2. Large rate performance still needs to be improved; 3. Poor product consistency and poor battery processing performance; 4. Easy to absorb water, the battery is easy to swell

Method used

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  • Titanium-series cathode active material and preparation method thereof, titanium-series lithium ion power battery
  • Titanium-series cathode active material and preparation method thereof, titanium-series lithium ion power battery
  • Titanium-series cathode active material and preparation method thereof, titanium-series lithium ion power battery

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preparation example Construction

[0030] The preparation method of the titanium-based negative electrode active material of the present invention comprises the following steps:

[0031] 1. According to the molar ratio of lithium in inorganic lithium salt: titanium dioxide: doping modifier: 1.9-2.1: 4.9-5.1: greater than 0-10, after mixing, use high-speed stirring or ball milling method, speed 100-500r / min, grind Disperse for 2 to 40 hours to prepare a composite lithium titanate precursor mixture, that is, Li 4 Ti 5 o 12 with M x Inorganic lithium salts are lithium hydroxide, lithium carbonate, lithium acetate, lithium chloride, lithium sulfate, lithium nitrate, lithium iodide, lithium tert-butoxide, lithium benzoate, lithium formate, lithium fluoride, lithium chromate , lithium citrate tetrahydrate, lithium tetrachloroaluminate, lithium bromide, lithium tetrafluoroborate or lithium oxalate, the doping modifier is metal element Al, Mg, Cu, Ag, Ni, Co, Mn, Cd, Pb, Bi , Sn, Ge, metal compounds alumina, magnes...

Embodiment 1

[0037] Example 1: 2mol of lithium carbonate, 5mol of titanium dioxide, 0.1mol of nano-sized copper oxide powder, 4mol of nano-carbon, and a rotation speed of 300r / min were ground and dispersed for 16 hours to obtain a composite lithium titanate precursor mixture; the composite lithium titanate precursor mixture Disperse in ethanol, the ratio of solid to organic solvent is 1.5:1, and spray dry at 150°C to obtain dispersed powder; heat-treat the dispersed powder at a heating rate of 5°C / min in a temperature range of 700°C For 24 hours, nitrogen gas was introduced during the period, and naturally cooled to below 150 ° C; crushed and sieved to obtain Li with an average particle size of 10 μm 4 Ti 5 o 12 / CuO 0.1 (x=0.1) negative electrode active material. Such as figure 1 As shown, the lithium titanate material has spherical and spheroidal microscopic features, and the surface is smooth, such as Figure 6 As shown, the thickness of the nano-coating layer is about 8nm, and the...

Embodiment 2

[0040] Example 2: 2.1mol of lithium carbonate, 5.1mol of titanium dioxide, and 0.1mol of nano-scale alumina powder were ground and dispersed for 24 hours at a speed of 200r / min to prepare a composite lithium titanate precursor mixture; the composite lithium titanate precursor mixture was dispersed in In ethanol, the ratio of solid to organic solvent is 1.5:1, and the dispersed powder is obtained by spray drying at 250°C; the dispersed powder is heat-treated at a temperature of 400°C for 40 hours at a heating rate of 10°C / min , during which nitrogen gas was introduced, naturally cooled to below 150°C; crushed and sieved to obtain Li with an average particle size of 1 μm 4 Ti 5 o 12 / (Al 2 o 3 ) 0.1 (x=0.1) negative electrode active material.

[0041] The negative electrode active material obtained above, the conductive agent acetylene black, and the binder PVDF are used in a mass ratio of 85%:10%:5% to make a negative electrode sheet. LiFePO 4 , Conductive agent acetylen...

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Abstract

The invention discloses a titanium cathode active substance, a preparation method thereof and a titanium lithium ion power battery, and aims to solve the technical problem of enhancing the rate performance of a lithium ion power battery. The formula of the titanium cathode active substance is Li4Ti5O12 / Mx, wherein Li4Ti5O12 is spinel lithium titanate, M is a dopant such as a metal simple substance, a metal compound, a nonmetallic simple substance or a nonmetallic compound; the elements or the ions contained in the dopant enter the Li4Ti5O12 crystal lattice or are compounded with the Li4Ti5O12 crystal lattice; and the preparation method comprises the following steps: the precursor mixture of compound lithium titanate is prepared, and spray drying and heat treatment are performed. The cathode of the titanium lithium ion power battery adopts Li4Ti5O12 / Mx. Compared with the prior art, the titanium cathode active substance has the advantages of high capacity, high bulk density, high volume specific capacity, good high-rate performance, good product uniformity, good battery processability, low possibility of air bulking of the battery, and low cost.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material for a power battery and a preparation method thereof, and a lithium-ion power battery using the negative electrode material, in particular to a titanium-based negative-electrode material and a preparation method thereof, and a titanium-based negative-electrode material using the same lithium-ion power battery. Background technique [0002] With the steady development of the global economy, the production of automobiles has increased dramatically. Exhaust gas emitted by fuel vehicles causes air pollution, and 63% of the pollutants in the air come from vehicle exhaust. Environmental problems, especially the deteriorating air quality, have attracted widespread attention from all over the world, especially developed countries. After the outbreak of the three global oil crises in the 1970s, various multinational automobile companies began to develop various types of electric vehicl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/04H01M10/36H01M4/485H01M10/052
CPCY02E60/122H01M10/052H01M4/485Y02E60/10
Inventor 岳敏程林贺雪琴梅佳张万红
Owner BTR NEW MATERIAL GRP CO LTD
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