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Additives, electrolyte solutions and lithium-ion batteries

An electrolyte solution and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as difficulty in forming a stable solid electrolyte film, peeling and damage of graphite negative electrode materials, and improve electrochemical stability and cycle performance, and improve structural damage. Effect

Active Publication Date: 2018-02-02
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PC molecules will be co-embedded with the graphite negative electrode during the battery discharge process. As a result, it is difficult to form a stable solid electrolyte film (SEI) on the surface of the graphite negative electrode, which leads to continuous peeling and destruction of the graphite negative electrode material. To a certain extent, the application of PC as an electrolyte component is limited

Method used

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  • Additives, electrolyte solutions and lithium-ion batteries
  • Additives, electrolyte solutions and lithium-ion batteries
  • Additives, electrolyte solutions and lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of additives: Dissolve 4g of bismaleimide and 2.207g of diaminodiphenylmethane in NMP, remove oxygen in the solution, heat to 130°C for 6 hours, cool, precipitate with ethanol, wash and dry to obtain The additive is represented by formula (5).

[0049] Add the polymer as an additive to the electrolyte solution of a lithium ion battery, specifically mixing propylene carbonate and diethyl carbonate as a solvent, LiPF 6 Dissolved in this solvent, LiPF 6 The concentration is 1 mol / L, the volume ratio of propylene carbonate and diethyl carbonate is 3:2, and the electrolyte is configured. The additive is added to the electrolyte, and the concentration of the additive in the electrolyte is 1% (w / v). Assemble a lithium battery, the positive electrode is lithium metal, and the negative electrode is graphite, and the battery is charged and discharged at a constant current of 0.2C between 0.01V and 2V.

Embodiment 2

[0054] The same additives as in Example 1 were added to the electrolyte solution of the lithium ion battery, specifically mixing propylene carbonate and diethyl carbonate as a solvent, LiPF 6 Dissolved in this solvent, LiPF 6 The concentration is 1.2 mol / L, the volume ratio of propylene carbonate to diethyl carbonate is 2:2, and the electrolyte is configured. The additive is added to the electrolyte, and the concentration of the additive in the electrolyte is 1% (w / v). Assemble a lithium battery, the positive electrode is metal lithium, and the negative electrode is graphite, and the battery is charged and discharged at a constant current of 0.2C in the voltage range of 0.01V to 2V.

[0055] See figure 2 The addition of additives in Example 2 can not only improve the phenomenon of PC co-intercalation of graphite, the specific discharge capacity of the battery after 60 cycles can reach about 314mAh / g, which is comparable to that of the lithium ion battery of Comparative Example 1...

Embodiment 3

[0057] Preparation of additives: Dissolve 3.2g of N-phenylmaleimide and 2.34g of diaminodiphenylmethane in NMP, remove oxygen in the solution, heat to 120°C for 8 hours, cool down, precipitate with ethanol, and wash Drying to obtain the additive. The polymer was added as an additive to the electrolyte solution of a lithium ion battery, the lithium ion battery was assembled under the same conditions as in Example 1, and the battery cycle performance test was performed. After testing, adding additives to the lithium-ion battery electrolyte can improve the role of PC co-intercalation of graphite, and the discharge specific capacity can reach about 312mAh / g after 60 cycles.

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Abstract

The invention relates to an additive for lithium-ion batteries, the additive is a polymer obtained by polymerizing an organic diamine compound and a maleimide monomer, and the maleimide monomer includes maleimide At least one of a maleimide monomer, a bismaleimide monomer, a polymaleimide monomer and a maleimide derivative monomer. The invention also relates to an electrolyte solution and a lithium ion battery.

Description

Technical field [0001] The invention relates to an additive, an electrolyte solution and a lithium ion battery using the electrolyte solution. Background technique [0002] Carbonate electrolyte is currently the most widely used electrolyte for lithium-ion batteries. Propylene carbonate (PC) has the characteristics of low melting point (-55°C), high boiling point (240°C), high dielectric constant, etc. It has excellent ion conductivity especially at low temperatures and is an ideal electrolyte component. However, PC molecules will be co-embedded with the graphite negative electrode during battery discharge. As a result, it is difficult to form a stable solid electrolyte membrane (SEI) on the surface of the graphite negative electrode. As a result, the graphite negative electrode material will continue to peel off and be destroyed. To a certain extent, it limits the application of PC as an electrolyte component. Summary of the invention [0003] In view of this, it is indeed nece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525
CPCH01M10/052H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10H01M10/0525
Inventor 钱冠男何向明尚玉明李建军王莉高剑杨聚平王要武赵鹏
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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