Low temperature lithium ion battery

A lithium-ion battery, low-temperature technology, applied in the field of lithium-ion batteries, can solve the problems of low discharge rate, long heating time, and application field limitations, and achieve the effects of increasing initial discharge voltage, improving kinetic performance, and overcoming poor discharge capacity

Inactive Publication Date: 2017-12-15
DONGGUAN MCNAIR NEW POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the traditional lithium-ion battery low-temperature solution is mainly the external heating method of the battery pack, which has the disadvantage of long heating time, and the cost of the battery system is greatly increased; one is to add an electrolyte solvent with a low melting point and low viscosity at low temperature The main method is to improve the low-temperature performance while seriously weakening the high-temperature performance of the battery, and it is difficult to guarantee the long-term low-temperature cycle performance, and the application field is relatively limited.
Wuhan Zhongju Energy Technology Co., Ltd. published an invention patent with the application number 200910063261.

Method used

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Examples

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Effect test

Embodiment 1

[0025] A cylindrical ternary power ultra-low temperature lithium-ion battery of the present invention comprises a cylindrical casing, a winding core accommodated in the casing, an electrolyte and a battery cap, and the winding core is sequentially stacked by a negative electrode sheet, a separator and a positive electrode sheet. It is formed by winding, and the electrolyte penetrates into the winding core. There are at least two positive tabs between the battery cap and the positive tab. One end of the positive tab is connected to the battery cap, and the other end of the positive tab is connected to the positive tab. There are at least two negative tabs, one end of the negative tab is connected to the negative plate, and the other end of the negative tab is connected to the bottom of the housing; wherein, the composition of the positive plate, separator, negative plate, electrolyte and cell structure is as follows:

[0026] Positive electrode sheet: The positive electrode acti...

Embodiment 2

[0032] Different from Example 1, the composition of positive electrode sheet, separator, negative electrode sheet and electrolyte is as follows:

[0033] Positive electrode sheet: The positive electrode active material is lithium nickel cobalt aluminate doped with lithium manganese oxide, and the surface of lithium nickel cobalt aluminate is coated with Li 14 Zn(GeO 4 ) 4 ; In the positive electrode active material, lithium nickel cobalt aluminate: lithium manganese oxide: Li 14 Zn(GeO 4 ) 4 The weight percentage is 80%: 15%: 5.0%, and the median particle size D50 of the ternary material is 3-11 μm; the median particle size D50 of lithium manganate is 3-20 μm; the conductive agent is carbon nanotube, sticky The binding agent is polyvinylidene fluoride; wherein, the positive electrode active material: conductive agent: the weight percentage of binder is 96%: 2%: 2%; the thickness of the positive electrode sheet is 80 μm, and the compacted density of the positive electrode s...

Embodiment 3

[0039] Different from Example 1, the composition of positive electrode sheet, separator, negative electrode sheet and electrolyte is as follows:

[0040] Positive electrode sheet: The positive electrode active material is lithium nickel cobalt aluminate doped with lithium manganese oxide, and the surface of lithium nickel cobalt aluminate is coated with Li 3.3 La 0.56 TiO 3 ; In the positive electrode active material, lithium nickel cobalt aluminate: lithium manganese oxide: Li 3.3 La 0.56 TiO 3 The weight percentage is 75%: 20%: 5.0%, and the median particle size D50 of the ternary material is 3-11 μm; the median particle size D50 of lithium manganate is 3-20 μm; the conductive agent is carbon nanotube, sticky The binding agent is polyvinylidene fluoride; wherein, the positive electrode active material: conductive agent: the weight percentage of binder is 97%: 1.5%: 1.5%; the thickness of the positive electrode sheet is 130 μm, and the compacted density of the positive el...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and especially relates to a low temperature lithium ion battery. The low temperature lithium ion battery comprises a positive plate, a negative plate, a diaphragm and an electrolyte; the positive active material of the positive plate is ternary material-doped lithium manganate, and the surface of the above ternary material is coated with a fast ion conductor; the negative active material of the negative plate is graphite or amorphous carbon-coated graphite; and the electrolyte comprises a lithium salt, a solvent and an additive, the lithium salt is a mixture containing at least two of LiPF6, LiBOB, LiODFB, LiFSI, LiTFSI and LiPO2F2, and the solubility of the lithium salt is 1.0-1.5 mol/L. The comprehensive optimization of the material system of the positive plate, the negative plate and the electrolyte and the cell structure of the battery reduces the interface impedance of the battery at a low temperature, and improves the initial discharge voltage of the battery in an ultralow temperature environment, so the battery can normally work under -40 DEG C ultralow temperature and large rate conditions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a low-temperature lithium ion battery. Background technique [0002] Due to its outstanding advantages such as high energy density, low self-discharge, and no memory effect, lithium-ion batteries have become the main solution for mobile energy, and are widely used in many fields such as mobile phones, tablets, electric vehicles, and home energy storage. The use environment of lithium-ion batteries is relatively complex, so higher requirements are placed on the performance of lithium-ion batteries. The current low-temperature performance of lithium-ion batteries is relatively poor, which has restricted the promotion and use of lithium-ion batteries in the field of electric vehicles. The main manifestations are that after the temperature drops (<0°C), the viscosity of the internal electrolyte of lithium ions increases, and the mobility of lithium ions changes. Poo...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 邓耀明宋晓娜肖英蔡志炬黄旭清杨文平
Owner DONGGUAN MCNAIR NEW POWER
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