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Additive, electrolyte solution and lithium ion battery

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 structural damage, electrochemical stability and cycle performance Effect

Active Publication Date: 2016-01-13
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Additive, electrolyte solution and lithium ion battery
  • Additive, electrolyte solution and lithium ion battery

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, precipitate with ethanol after cooling, wash and dry to obtain The additive is represented by formula (5).

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

Embodiment 2

[0054] Adopt the additive identical with embodiment 1, add in the electrolytic solution of lithium-ion battery, be specifically that propylene carbonate and diethyl carbonate are mixed as solvent, LiPF 6 Dissolved in this solvent, LiPF 6 The concentration is 1.2mol / L, the volume ratio of propylene carbonate and diethyl carbonate is 2:2, and it is configured as an electrolyte. The additive is added to the electrolyte, and the mass volume concentration of the additive in the electrolyte is 1% (w / v). Assemble a lithium battery, the positive electrode is lithium metal, the negative electrode is graphite, and it is charged and discharged with a constant current of 0.2C between the voltage range of 0.01V and 2V.

[0055] see figure 2 , after adding additives in Example 2, not only can the phenomenon of PC co-embedded graphite be improved, but the discharge specific capacity of the battery after 60 cycles can reach about 314mAh / g, which is 308mAh / g after 60 cycles of the lithium-i...

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, precipitate with ethanol after cooling, wash and dry dry to obtain the additive. The polymer was added as an additive into the electrolyte solution of the lithium ion battery, and the lithium ion battery was assembled under the same conditions as in Example 1, and the battery cycle performance test was performed. After testing, the effect of PC co-intercalated graphite can be improved by adding additives to the lithium-ion battery electrolyte, 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 a lithium ion battery. The addition is a polymer obtained by an organic diamines compound and a maleimides monomer through a polymerization reaction, and the maleimide monomer comprises at least one of a maleimide monomer, a bismaleimide monomer, a polymaleimide monomer and a maleimides derivative monomer. The invention also relates to an electrolyte solution and the lithium ion battery.

Description

technical field [0001] The invention relates to an additive, an electrolytic solution and a lithium ion battery using the electrolytic solution. Background technique [0002] Carbonate electrolyte is currently the most widely used lithium-ion battery electrolyte. Propylene carbonate (PC) has the characteristics of low melting point (-55°C), high boiling point (240°C), high dielectric constant, etc., especially at low temperature with excellent ion conductivity, and is an ideal electrolyte component. 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. Contents of the invention [0003] In view of this, it is r...

Claims

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Application Information

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Patent Type & Authority Applications(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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