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Lithium titanate-based lithium ion battery negative electrode, lithium ion battery and formation method of lithium ion battery

An ion battery, lithium titanate technology, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve problems such as only 90%, lithium precipitation safety accidents, low battery design capacity, etc., to improve design The effect of capacity

Inactive Publication Date: 2017-07-21
上海德朗能动力电池有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design uses 10% more lithium titanate material, and the space occupied by this part of the material makes the design capacity of the battery low; The fully charged state, that is, the utilization rate of the positive electrode is only 90%, which also leads to the low design capacity of the battery, and if the circuit is out of control and other accidents occur, overcharging may lead to lithium precipitation and cause safety accidents

Method used

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  • Lithium titanate-based lithium ion battery negative electrode, lithium ion battery and formation method of lithium ion battery
  • Lithium titanate-based lithium ion battery negative electrode, lithium ion battery and formation method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 (the addition amount of the additive in this example is about 0.2wt% of the lithium titanate active material)

[0034] Lithium-ion battery negative electrode production:

[0035] Add 13.5g PVDF to 550mL NMP, fully stir to dissolve; add 4.5g conductive carbon black and stir for 30 minutes; add 449.1g lithium titanate material (capacity 165mAh / g), 0.9g commercially available silicon oxide powder (half-cell measured first charge Capacity 2380mAh / g, first cycle efficiency 33.7%), stirring for 60 minutes. The obtained slurry was coated on an aluminum foil with a thickness of 20 micrometers, oven-dried at 120 degrees, and the coating weight gain was 220 g / m2 (both sides).

[0036] Compacted according to density 2.0, cut into a width of 57mm.

[0037] Lithium-ion battery production:

[0038] Add 12g PVDF to 350mL NMP, fully stir to dissolve; add 12g conductive carbon black and stir for 30 minutes; add 800g commercially available NMC622 ternary positive electrode m...

Embodiment 2

[0046] Embodiment 2 (the addition amount of the additive described in this embodiment is about 1wt% of the lithium titanate active material)

[0047] Production of lithium titanate-based lithium-ion battery negative electrode:

[0048] Add 13.5g PVDF to 550mL NMP, fully stir to dissolve; add 4.5g conductive carbon black and stir for 30 minutes; add 445.5g lithium titanate material (capacity 165mAh / g), 4.5g commercially available tin dioxide (half-cell measured first charge capacity 1350mAh, first week efficiency 31%) powder, stirred for 60 minutes. The obtained slurry was coated on an aluminum foil with a thickness of 20 microns, and dried in an oven at 120 degrees, and the coating weight gain was 220 g / m2 (both sides).

[0049] Compacted according to density 2.0, cut to a width of 57mm

[0050] Production of 18650 lithium-ion battery:

[0051] Step is with embodiment 1.

Embodiment 3

[0052] Example 3 (the addition amount of the additive in this example is about 2wt% of the lithium titanate active material)

[0053] Add 13.5g PVDF to 550mL NMP, fully stir to dissolve; add 4.5g conductive carbon black and stir for 30 minutes; add 441g lithium titanate material (capacity 165mAh / g), 9g commercially available nickel oxide powder (actually measured first charge capacity 980mAh / g , first week efficiency 38.1%), stirred for 60 minutes. The obtained slurry was coated on an aluminum foil with a thickness of 20 microns, and dried in an oven at 120 degrees, and the coating weight gain was 220 g / m2 (both sides).

[0054] Compacted according to density 2.0, cut into a width of 57mm.

[0055] Production of 18650 lithium-ion battery:

[0056] Step is with embodiment 1.

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Abstract

The invention discloses a lithium titanate-based lithium ion battery negative electrode. The lithium titanate-based lithium ion battery negative electrode comprises a current collector and a negative electrode material, wherein the negative electrode material is coated on the current collector and comprises a lithium titanate active substance, a conductive agent, a binding agent and an additive, the lithium ion receiving capacity of the additive after initial charge is over two times of that of the lithium titanate active substance, and the addition quantity of the additive accounts for 0.2-4wt% of the lithium titanate active substance. By the lithium titanate-based lithium ion battery negative electrode, the positive electrode capacity can be fully developed, so that the design capacity of the battery is improved; and the additive employs a substance with charge-discharge rate smaller than 50% in an initial period, a large part of lithium ions absorbed by the additive can be fixed and do not participate in subsequent charge-discharge circulation, so that repeated volume expansion and shrinkage of the additive is reduced or eliminated, the damage to an electrode structure is improved, and the lithium titanate-based lithium ion battery negative electrode has the characteristic of longer cycle lifetime. Correspondingly, the invention also provides a lithium ion battery employing the lithium titanate-based lithium ion battery negative electrode and a formation method of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium titanate-based lithium ion battery negative electrode, a lithium ion battery and a formation method thereof. Background technique [0002] In recent years, with the popularization of smart mobile terminals and the promotion of resources and environmental protection, lithium-ion batteries have been widely used in portable electronic products, power tools, energy storage, and electric vehicles. [0003] Lithium titanate, as a material that is close to zero strain during the lithium ion insertion / extraction process, has the advantage of a long cycle life; due to its fast solid phase diffusion of lithium ions, it has excellent low temperature performance and excellent rate performance; In addition, due to the high potential of lithium intercalation into lithium titanate, it is not easy to generate lithium dendrites when used as a negative electrode, so the safety is highe...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/485H01M4/62H01M10/0525H01M10/44
CPCH01M4/131H01M4/485H01M4/62H01M4/621H01M10/0525H01M10/446Y02E60/10
Inventor 赵前永赵文娟叶征成梁海涛张茜陈瑶高学锋吴江峰
Owner 上海德朗能动力电池有限公司
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