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Lithium titanate battery and manufacturing method thereof

A technology of lithium titanate battery and manufacturing method, which is applied to the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low initial charge and discharge efficiency, easy lithium precipitation, etc., and achieve good electrochemical stability and safety. High and good cycle performance

Inactive Publication Date: 2018-03-23
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high energy density irregular ternary- Lithium titanate lithium ion battery

Method used

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  • Lithium titanate battery and manufacturing method thereof
  • Lithium titanate battery and manufacturing method thereof
  • Lithium titanate battery and manufacturing method thereof

Examples

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Embodiment 1

[0033] A manufacturing method of a lithium titanate battery, the manufacturing method comprising the following steps:

[0034] a) Making positive and negative electrodes: First, make polytetrafluoroethylene (PVDF) into a solution with a mass fraction of 8% with N-methylpyrrolidone (NMP), then add a conductive agent, and disperse at high speed for 2 hours. MaterialLiNi 0.33 co 0.33 mn 0.33 o 2 +LiNi 0.5 co 0.3 mn 0.2 o 2 Disperse in an organic solvent, stir evenly to obtain a positive electrode slurry, disperse for 2 hours at high speed, add NMP to adjust the viscosity to 1000 mPa s, and sieve the positive electrode slurry with a 120-mesh metal mesh after high-speed shear dispersion for 1 hour, Evenly coat the sieved positive electrode slurry on an aluminum foil with a thickness of 20 microns, dry it at 110°C, and roll the dried positive electrode sheet. The thickness of the positive electrode sheet after rolling is 100 μm, and the compacted density is 3.0g / cm 3 ; Con...

Embodiment 2

[0041] A manufacturing method of a lithium titanate battery, the manufacturing method comprising the following steps:

[0042] a) Making positive and negative electrodes: First, make polytetrafluoroethylene (PVDF) into a solution with a mass fraction of 8% with N-methylpyrrolidone (NMP), then add a conductive agent, and disperse at high speed for 2 hours. MaterialLiNi 0.33 co 0.33 mn 0.33 o 2 +LiNi 0.6 co 0.2 mn 0.2 o 2 Disperse in an organic solvent, stir evenly to obtain the positive electrode slurry, disperse at high speed for 2 hours, add NMP to adjust the viscosity to 2000 mPa s, and sieve the positive electrode slurry with a 100-mesh metal mesh after high-speed shearing and dispersing for 1 hour, The sieved positive electrode slurry is evenly coated on an aluminum foil with a thickness of 15 microns, dried at 100°C, and the dried positive electrode sheet is rolled. The thickness of the positive electrode sheet after rolling is 200 μm, and the compacted density is...

Embodiment 3

[0049] A manufacturing method of a lithium titanate battery, the manufacturing method comprising the following steps:

[0050] a) Making positive and negative electrodes: First, make polytetrafluoroethylene (PVDF) into a solution with a mass fraction of 8% with N-methylpyrrolidone (NMP), then add a conductive agent, and disperse at high speed for 2 hours. MaterialLiNi 0.7 co 0.15 mn 0.15 o 2 +LiNi 0.6 co 0.2 mn 0.2 o 2 Disperse in an organic solvent, stir evenly to obtain a positive electrode slurry, disperse for 2 hours at high speed, add NMP to adjust the viscosity to 3000 mPa s, and sieve the positive electrode slurry with a 110-mesh metal mesh after high-speed shear dispersion for 1 hour, The sieved positive electrode slurry is evenly coated on an aluminum foil with a thickness of 18 microns, dried at 140°C, and the dried positive electrode sheet is rolled. The thickness of the positive electrode sheet after rolling is 300 μm, and the compacted density is 3.3g / cm ...

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Abstract

The invention relates to a lithium titanate battery, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte and an outer package, and the positive electrode sheet and the negative electrode sheet are respectively composed of positive and negative current collectors and coated on the positive and negative electrode current collectors Composed of positive and negative electrode materials, the positive electrode material includes a positive electrode active material, a positive electrode conductive agent and a positive electrode binder, and the positive electrode active material is an irregular ternary positive electrode material. Due to the use of irregular ternary materials in the positive electrode and the maximum charging potential of the positive electrode with a high proportion of nickel at 4.4V, the battery made of this material has a very high specific capacity, greater than 180mAh / g, and has a high Stability; in the present invention, the energy density of the battery cell assembled with the high specific capacity positive electrode and the lithium titanate negative electrode can reach 90Wh / kg, which is significantly higher than the energy density of the existing lithium titanate battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an irregular ternary-lithium titanate lithium ion battery with high energy density and a manufacturing method. Background technique [0002] At present, the anode materials of commercialized lithium-ion batteries are basically graphite-like carbon materials. Carbon materials have the advantages of high thermal stability, good electrical conductivity, fast intercalation and extraction of lithium ions, and high reversibility. than, lithium titanate (Li 4 Ti 5 o 12 ) has obvious advantages: 1) It is a near-zero-volume deintercalation lithium insertion material, which does not change its structure during charging and discharging, and has good cycle performance; 2) It has a good charging and discharging platform; 3) Theoretical specific capacity 175 mAh / g, the actual specific capacity can reach 160 mAh / g, and it is concentrated in the platform area; 4) It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M10/0569H01M10/058
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0569H01M10/058Y02E60/10Y02P70/50
Inventor 石先兴张琦葛民民吕豪杰陈军
Owner WANXIANG 123 CO LTD
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