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Negative electrode material additive and preparation method thereof

A negative electrode material and additive technology, applied in the field of negative electrode material additive and its preparation, can solve the problems of low initial charge and discharge efficiency, unstable metal lithium, practical production obstacles, etc., and achieve the effect of solving the low initial charge and discharge efficiency

Active Publication Date: 2018-02-16
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium metal is very unstable in the air, which poses an insurmountable obstacle to actual production
[0005] At present, the low initial charge and discharge efficiency has become a technical bottleneck that hinders the commercial application of many anode materials, especially large-capacity anode materials.
Therefore, it is urgent to develop an effective and practical technology to fundamentally solve the problem of low charging and discharging efficiency of lithium batteries for the first time.

Method used

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  • Negative electrode material additive and preparation method thereof
  • Negative electrode material additive and preparation method thereof
  • Negative electrode material additive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Prepare a tetrahydrofuran solution with a pure phosphoric acid concentration of 10% (phosphoric acid 0.28g, tetrahydrofuran 2.5g) in the glove box, stir evenly, slowly add 0.06g of crushed lithium flakes, stir the solution, and wait until the tetrahydrofuran is completely volatilized to obtain lithium phosphate-coated lithium Material.

[0028] The lithium phosphate-coated lithium material prepared above was subjected to XRD analysis, and the results were as follows: figure 1 Shown: There is Li in the spectrum 3 PO 4 The existence of characteristic peaks proves that there is Li on the surface of lithium 3 PO 4 The cladding is generated.

[0029] Electrode preparation: Prepare the slurry according to the ratio of nickel cobalt lithium manganese oxide positive electrode material (NCM) / conductive agent / PVDF=8:1:1, and make the positive electrode sheet after coating, drying and slicing, and the negative electrode sheet is Using the above-mentioned prepared lithium phos...

Embodiment 2

[0036] Using nickel cobalt lithium manganese oxide (NCM) as the positive electrode material, porous silicon as the negative electrode material, adding 10wt% lithium phosphate-coated lithium material (prepared in Example 1), and using lithium hexafluorophosphate carbonate electrolyte and PVDF diaphragm to assemble the battery , the test results of its specific discharge capacity and Coulombic efficiency are as follows Figure 5 shown.

Embodiment 3

[0038] Using nickel cobalt lithium manganese oxide (NCM) as the positive electrode material, porous silicon as the negative electrode material, adding 20 wt% lithium phosphate-coated lithium material (prepared in Example 1), and using lithium hexafluorophosphate carbonate electrolyte and PVDF diaphragm to assemble the battery , the test results of its specific discharge capacity and Coulombic efficiency are as follows Figure 5 shown.

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Abstract

The invention provides a negative electrode material additive and a preparation method thereof. The negative electrode material additive is lithium whose surface is coated with a lithium phosphate coating layer. The lithium phosphate-coated lithium material prepared by the invention is used as a negative electrode material additive to effectively solve the problem of low initial charging and discharging efficiency of the lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode material additive and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and electric vehicles due to their advantages such as high voltage, high energy density, long service life, no pollution, and low self-discharge. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite negative electrode material, and its theoretical capacity is 372mAh / g, and the actual development is close to the theoretical capacity, and the development space is limited, which can no longer meet the needs of electric vehicles for large-capacity and high-power lithium-ion batteries. need. [0003] Some new negative electrode materials can have a high theoretical capacity, such as the theoretical capacity of silicon is 4200mAh / g, but its initial charge and discharge efficiency is relatively low. When these negative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCY02E60/10
Inventor 刘文娟裴卫兵
Owner 微宏先进材料公司
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