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Active material and lithium ion battery

A technology of active material and particle size, applied in the field of active materials and lithium-ion batteries, can solve the problems of battery safety hazards, performance degradation, SEI film instability, etc.

Active Publication Date: 2019-08-13
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after lithium metal is added to the electrolyte by this method, the reaction speed is very fast; when lithium is replenished at the negative electrode, the formed SEI film is unstable, and the negative electrode material is easy to break; when lithium is replenished at the positive electrode, cobalt Lithium acid has poor resistance to excessive lithium intercalation, the particles are broken, and the performance is reduced; in addition, some lithium metal particles remaining on the electrode surface and the by-products of the lithium metal reaction will pierce the separator and cause battery safety hazards

Method used

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  • Active material and lithium ion battery
  • Active material and lithium ion battery
  • Active material and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Discharge the formed lithium ion battery sample 1 to 2.8V, disassemble the lithium ion battery, take out the pole piece, soak in DMC for 2 hours, dry it in a drying room, burn it in a muffle furnace at 600°C for 2 hours, and use 200 mesh Sieving to obtain active material sample 1. And using a scanning electron microscope (SEM) to observe the first particle and second particle distribution map of the active material sample 1, such as figure 1 Shown.

[0054] 2. Use a laser particle size tester (atersizer2000, Malvern, UK) to test the particle size of the active material sample 1 prepared in step 1, and draw the particle size versus volume distribution diagram based on the particle size test results, such as figure 2 Shown. Among them, the measured Dv10 is 1.9 μm, Dv50 is 11.5 μm, and Dv90 is 23.5 μm. According to the formula (Dv90-Dv50)-(Dv50-Dv10), the particle size distribution is calculated to be 2.4.

[0055] 3. Use an energy spectrometer (EDS, Oxford-X-max energy s...

Embodiment 2

[0058] The preparation method of the active material sample 2 is the same as in Example 1.

[0059] As in Example 1, the particle size of the prepared active material sample 2 was tested using a laser particle size tester. Among them, Dv10 is measured to be 2.7 μm, Dv50 is 17.2 μm, and Dv90 is 26.4 μm. According to the formula (Dv90-Dv50)-(Dv50-Dv10), the particle size distribution is calculated to be -5.3; the energy spectrometer is used to measure the types of doped elements in the first particle and the second particle in the active material sample 2, the test results and implementation Example 1 is the same; inductively coupled plasma mass spectrometry (ICP) is used to measure the content of doping elements in the first particle and the second particle in active material sample 2, and calculate the ratio according to the formula: (a / b) / (c / d) , The ratio of (a / b) / (c / d) is equal to that of Example 1.

Embodiment 3

[0061] The preparation method of the active material sample 3 is the same as in Example 1.

[0062] As in Example 1, the particle size of the prepared active material sample 3 was tested using a laser particle size tester. Among them, Dv10 is measured to be 2.5 μm, Dv50 is 14.7 μm, and Dv90 is 28.5 μm. According to the formula (Dv90-Dv50)-(Dv50-Dv10), the particle size distribution is calculated to be 1.6; the energy spectrometer is used to measure the types of doping elements in the first particle and the second particle in the active material sample 3. The test results and examples 1 Same; use inductively coupled plasma mass spectrometry (ICP) to measure the content of doping elements in the first particle and second particle in active material sample 3, and calculate the ratio according to the formula: (a / b) / (c / d), The ratio of (a / b) / (c / d) is equal to the ratio of Example 1.

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Abstract

The invention provides an active material, a pole piece and a lithium ion battery. The particle size of the active material satisfies the following formula (1): (Dv90-Dv50)- And (Dv50-Dv10) is less than or equal to 2.5. The compaction density and the initial discharge capacity of the pole piece are improved by adjusting the particle size ratio of the first particles to the second particles in theactive material, so that the energy density (ED) of the battery is improved; by adjusting the types and contents of doping elements of the first particles and the second particles, the first particlesare more stable, and the 500-time circulating discharge capacity of the pole piece is improved, so that the characteristics of the battery are not deteriorated.

Description

Technical field [0001] The embodiments of the present application relate to the field of batteries, and more specifically, to an active material and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones, notebook computers, digital cameras, etc. due to their long service life and environmental protection. They also have good application prospects in electric vehicles and other fields. With the expansion of the application range, higher requirements are put forward for the performance of lithium-ion batteries, especially with the popularity of smart phones, the demand for high-energy density lithium-ion batteries is increasing. [0003] The methods for improving battery energy density in the prior art mainly include: adding lithium metal to the positive or negative matrix material of the lithium ion battery to pre-lithiate the matrix material to compensate for the lithium ion loss of the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/58H01M10/0525
CPCH01M4/13H01M4/5825H01M10/0525Y02E60/10
Inventor 曾巧王可飞
Owner NINGDE AMPEREX TECH
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