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Battery preparation method for solving 3V grade lithium titanate battery bulging and formation device

A lithium titanate battery and formation device technology, which is applied in the direction of secondary battery charging/discharging, electrical components, secondary batteries, etc., can solve problems such as electrolyte, gas generation, oxidation, etc., and achieve uniform battery temperature and cycle The effect of long life and simple operation

Inactive Publication Date: 2017-09-19
北京圣比和科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103700887B discloses a lithium titanate battery forming method, which discharges gas during the forming process, but cannot solve the problem of electrolyte being oxidized and generating gas during battery use

Method used

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  • Battery preparation method for solving 3V grade lithium titanate battery bulging and formation device
  • Battery preparation method for solving 3V grade lithium titanate battery bulging and formation device
  • Battery preparation method for solving 3V grade lithium titanate battery bulging and formation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A square lithium nickel manganese oxide-lithium titanate lithium ion battery was prepared, the battery specifications and dimensions were: thickness 18mm, width 65mm, height 140mm, design capacity 10 Ah.

[0030] The positive active material is surface-coated Al 2 o 3 Treated spinel lithium nickel manganese oxide, Al 2 o 3 The coating amount is 0.5wt% of the total positive electrode active material, and the particle size of the material is D 50 is 11.2 μm. The negative electrode active material is carbon nanotube composite nano-lithium titanate, wherein the mass content of carbon nanotube is 0.5%.

[0031] The electrolyte solvent is ethylene carbonate (EC) 20 (v / v)%, ethyl methyl carbonate (EMC) 80 (v / v)%; the electrolyte solute is lithium hexafluorophosphate (LiPF6) and lithium difluorooxalate borate (LiODFB) , the molar ratio of the two is 1:0.6, the total concentration of solute in the electrolyte is 1mol / L; the additive is equal mass of vinylene carbonate and h...

Embodiment 2

[0058] A lithium nickel manganese oxide-lithium titanate test battery was prepared. The battery specifications were: thickness 18mm, width 65mm, height 60mm, design capacity 3 Ah.

[0059] Electrode active material, diaphragm, and electrolyte are the same as in Example 1.

[0060] The electrodes are laminated, and the three cells are connected in parallel.

[0061] The battery manufacturing method is the same as in Example 1.

[0062] Charge to 3.6V with 1C constant current and constant voltage, cut-off current 0.01C. Then discharge to 2.7V at constant current of 1C, 5C, 10C, 15C, 20C, 25C, 30C respectively, the discharge rate results are shown in Figure 5 . It can be seen that a high-voltage-resistant electrolyte system with a wide electrochemical window is used, and a 3V-level spinel lithium nickel manganese oxide-lithium titanate battery is manufactured using a precise temperature-controlled formation process that utilizes feed heating during formation and discharge of ...

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Abstract

The invention provides a battery preparation method for solving 3V grade lithium titanate battery bulging. The method comprises the steps of positive and negative electrode slurry preparation, positive and negative electrode plate preparation, electrode group preparation, battery assembly, vacuum liquid injection by high-voltage-resistant electrolyte, precise temperature control formation by feeding heating during battery formation discharging, vacuum opening sealing and detection. The invention also provides a formation device. The 3V grade spinelle lithium nickel manganese oxide-lithium titanate battery is manufactured through wide-electrochemical-window high-voltage-resistant electrolyte by a temperature control formation process; the problem of battery bulging is solved; the cycle life of the battery is long. A PTC (positive temperature coefficient) thermistor mode is designed for heating a temperature control formation box; the PTC directly heats an aluminum alloy heat conduction plate for supporting the lithium titanate battery; the heating speed is high; the battery temperature is uniform. The operation is simple and convenient. The feeding heating of battery discharging is used; the control is easy; the energy is saved.

Description

technical field [0001] The invention belongs to the field of devices for converting chemical energy into electric energy, and in particular relates to a battery preparation method and a chemical formation device for solving the flatulence of a 3V lithium titanate battery. Background technique [0002] spinel lithium titanate (Li 4 Ti 5 o 12 ) is a new type of negative electrode material for lithium-ion batteries. After lithium ions are embedded in the crystal lattice, the crystal form does not change, and the volume change of the unit cell is less than 1%. It is called "zero-strain material", which makes the battery have very good charge and discharge. cycle performance. Spinel lithium titanate material is a three-dimensional lithium ion conductor with low ion diffusion resistance and fast charge and discharge speed. The material has a higher lithium intercalation electrode potential (1.55V vs. Li / Li + ), the battery can avoid the growth of lithium dendrites during char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/44H01M10/0566H01M10/615H01M10/6554H01M10/6571
CPCH01M10/0566H01M10/0587H01M10/446H01M10/615H01M10/6554H01M10/6571Y02E60/10Y02P70/50
Inventor 叶尚云张平伟李锡力
Owner 北京圣比和科技有限公司
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