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Lithium ion battery and preparation method thereof

A lithium ion battery and lithium salt technology, which is applied in the direction of lithium storage battery, battery electrode, secondary battery, etc., can solve the problems of increasing the preparation cost of lithium ion battery, and achieve the effects of improving production safety, labor saving and reducing production cost.

Pending Publication Date: 2019-08-06
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high activity of lithium powder, the battery preparation process after the pre-lithiation step requires the humidity of the operating environment to be well controlled, which increases the preparation cost of lithium-ion batteries.

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] In an argon-filled glove box (MB-10compact, purchased from MBraun), 938.6 mg NCM-111, 26.4 mg lithium peroxide, 10 mg Super P, 5 mg KS6L, 20 mg PVDF were added to 450 mL NMP. After stirring for 3 hours, the resulting homogeneously dispersed slurry was coated on an aluminum foil and then dried in vacuum at 80° C. for 6 hours. The coated aluminum foil was taken out from the glove box and cut into a plurality of 12mm positive pole pieces (abbreviated as NCM-Li 2 o 2 positive pole piece).

[0114] [Preparation of battery]

[0115] In a glove box (MB-10compact, purchased from MBraun) filled with argon gas, a button battery (CR2016) was assembled using the positive electrode sheet obtained above. Pure lithium metal foil was used as the counter electrode. 1M LiPF in FEC+EMC (volume ratio 3:7, partially fluorinated carbonate electrolyte) 6 Used as electrolyte. Celgard 2325 (PP / PE / PP film) was used as separator.

Embodiment 2

[0117] Prepare the positive electrode sheet (abbreviated as NCM-Li) in the same manner as described in Example 1 2 o 2 - Catalyst positive electrode sheet), the difference is that 10 mg of NCM-111 fine particles are added as a catalyst to prepare the positive electrode slurry, and 928.6 mg of NCM-111 is used instead of 938.6 mg of NCM-111. NCM-111 fine particles have a particle size of less than 1 μm.

Embodiment 3

[0119] Prepare the positive electrode sheet (abbreviated as NCM-Li) in the same manner as described in Example 2 2 o 2 - Catalyst positive pole piece), the difference is that 24.1 mg of lithium peroxide is used instead of 26.4 mg of lithium peroxide.

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Abstract

Provided is a novel lithium ion battery, which comprises a cathode, an anode and an electrolyte, wherein the cathode comprises a cathode active material and lithium peroxide. Also provided is a methodfor preparing the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are now widely used in energy storage systems and electric vehicles. [0003] For lithium-containing cathode materials (such as LiCoO 2 or LiNiO 2 ), lithium-ion batteries without lithium negative electrode materials (such as graphite) and electrolytes, when charging, lithium ions move from the positive electrode to the negative electrode. However, the moving lithium ions inevitably continuously react with the electrolyte. Therefore, lithium is undesirably consumed and a solid electrolyte interface (SEI) is formed on the negative electrode. The depleted lithium does not return to the positive electrode during subsequent discharge, resulting in rapid capacity fading of Li-ion batteries. [0004] Coating additional lithium powder or lithium nitride on the anode has been proposed to pre-lithiate the anode and compensate...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCH01M4/0459H01M4/136H01M4/1397H01M4/364H01M4/483H01M4/5825H01M10/0525H01M10/0567H01M10/446Y02E60/10H01M4/131H01M4/62H01M4/134H01M4/133H01M4/386H01M4/587H01M4/139H01M4/0447H01M4/525H01M10/052
Inventor 杨军别依田张晶晶窦玉倩
Owner ROBERT BOSCH GMBH
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