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Closed formation method of cylindrical lithium titanate battery

A technology of cylindrical lithium titanate and chemical formation method, which is applied in the direction of cylindrical shell batteries/batteries, secondary batteries, electrochemical generators, etc., can solve problems such as low efficiency, and achieve the goal of reducing subsequent high-temperature storage and high-temperature cycle gas production Effect

Active Publication Date: 2018-02-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still disadvantages such as the need to operate in a glove box with harsh environmental conditions and low efficiency

Method used

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  • Closed formation method of cylindrical lithium titanate battery
  • Closed formation method of cylindrical lithium titanate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a closed-ended formation method of a cylindrical lithium titanate battery of the present invention comprises the following steps:

[0024] (1) Pretreatment before chemical formation

[0025] First, measure the moisture content of the 32131 cylindrical lithium titanate battery roll core pole piece, which is 98ppm; the 9Ah lithium titanate cylindrical battery (the positive pole is Ruixiang ternary NCM622 material, the negative pole is self-produced lithium titanate LTO material, The diaphragm is Cangzhou Mingzhu 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci lithium titanate special electrolyte containing positive and negative electrode film-forming additives) for one-time dispensing treatment (without sealing the steel ball); after the first dispensing and sealing Lithium titanate battery is placed in a high-temperature room with a relative humidity of 55% at 45°C for 72 hours, so that the electrolyte can fully in...

Embodiment 2

[0032] A kind of closed formation method of cylindrical lithium titanate battery of the present invention comprises the following steps:

[0033] (1) Pretreatment before chemical formation

[0034] First, measure the moisture content of the 32131 cylindrical lithium titanate battery roll core pole piece, which is 120ppm; the 8Ah lithium titanate cylindrical battery (the positive pole is Ruixiang ternary NCM111 material, the negative pole is self-produced lithium titanate LTO material, The diaphragm is Cangzhou Mingzhu 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci lithium titanate special electrolyte containing positive and negative electrode film-forming additives) for one-time dispensing treatment (without sealing the steel ball); after the first dispensing and sealing Lithium titanate batteries are placed in a high-temperature room with a relative humidity of RH60% at 65°C for 36 hours, so that the electrolyte can fully infiltrate the positive ...

Embodiment 3

[0040] A kind of closed formation method of cylindrical lithium titanate battery of the present invention comprises the following steps:

[0041] (1) Pretreatment before chemical formation

[0042] First, measure the moisture content of the 32131 cylindrical lithium titanate battery roll core pole piece, which is 80ppm; the 9Ah lithium titanate cylindrical battery (the positive pole is Ruixiang ternary NCM523 material, the negative pole is self-produced lithium titanate LTO material, The diaphragm is Cangzhou Mingzhu 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci lithium titanate special electrolyte containing positive and negative electrode film-forming additives) for one-time dispensing treatment (without sealing the steel ball); after the first dispensing and sealing Lithium titanate battery is placed in a high-temperature room with a relative humidity of 40% at 50°C for 72 hours, so that the electrolyte can fully infiltrate the positive and ne...

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Abstract

The invention discloses a closed formation method of a cylindrical lithium titanate battery. The closed formation method is applicable to a cylindrical lithium titanate battery with a negative electrode material being a lithium titanate material. The closed formation method comprises the steps of measuring moisture content of a roll core pole plate of the cylindrical lithium titanate battery, placing the dispensed and pre-packaged cylindrical lithium titanate battery in a high-temperature room to stand after liquid injection, removing sealing glue after the pole plate is fully immersed and stabilized, vacuumizing and discharging air, sealing a steel ball, and performing secondary dispensing and sealing; placing the lithium titanate battery on a formation cabinet for battery formation processing, wherein the formation process is divided into two stages under a normal-temperature environment, constant-current charging is performed with an I1 current in the first stage until a voltage reaches V1, constant-current and constant-voltage charging is performed with a small current I2 in the second stage, a cutoff voltage is V2, and a cutoff current is I3; and placing the lithium titanate battery in a normal-temperature environment condition for aging. By the method, the closed formation of the cylindrical lithium titanate battery is achieved, gas generation during the formation processand the circulation process of the lithium titanate battery is prevented, and industrial production on a large scale is easy to achieve.

Description

technical field [0001] The invention relates to a method for forming a lithium titanate battery, in particular to a closed-ended method for forming a cylindrical lithium titanate battery. The cylindrical lithium titanate battery uses Ni, Co, and Mn ternary composite materials as positive electrode active materials. The spinel lithium titanate material is used as the negative electrode active material. Background technique [0002] In recent years, academia and industry have found it difficult to completely solve the problem of gas production in lithium titanate (LTO) batteries from the materials and electrolyte itself. It is necessary to combine lithium titanate materials, electrolytes, moisture control in the preparation process, and chemical aging. A comprehensive solution to the system and process can achieve a better effect of inhibiting the gas production of lithium titanate batteries. [0003] From the perspective of the gas production mechanism of lithium titanate ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/0422H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 朱春林杨尘汪涛王金龙段锐
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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