A kind of solid polymer electrolyte and its preparation method and lithium ion secondary battery

A solid polymer, electrolyte technology, applied in solid electrolyte, secondary battery, non-aqueous electrolyte and other directions, can solve the problem of low capacity of lithium ion secondary battery, and achieve easy industrial production, low cost, simple and convenient preparation process Effect

Active Publication Date: 2020-10-02
山西长韩新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention proposes a solid polymer electrolyte, a preparation method thereof, and a lithium-ion secondary battery to solve the problem of low capacity of lithium-ion secondary batteries prepared from existing polymer solid electrolytes

Method used

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  • A kind of solid polymer electrolyte and its preparation method and lithium ion secondary battery
  • A kind of solid polymer electrolyte and its preparation method and lithium ion secondary battery
  • A kind of solid polymer electrolyte and its preparation method and lithium ion secondary battery

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preparation example Construction

[0026] The present invention also relates to a method for preparing the above-mentioned solid polymer electrolyte, comprising the following steps:

[0027] S1, preparing polytrimethylene carbonate by polymerization of trimethylene carbonate;

[0028] S2. Mix polytrimethylene carbonate, plasticizer and lithium salt to prepare a first mixed solution;

[0029] S3, then add the bridging agent to the first mixed solution, and mix evenly to prepare the second mixed solution;

[0030] S4. Adding the second initiator to the second mixed solution and heating to obtain a solid polymer electrolyte.

[0031] In the above-mentioned embodiment, the solvent is methanol, and the specific processes of steps S2, S3 and S4 can adopt the prior art. Preferably, in step S1, trimethylene carbonate and initiator are added to the ampoule, which is immersed in liquid nitrogen In , after vacuum sealing the ampoule, the ampoule was heated to polymerize the trimethylene carbonate.

[0032] The present ...

Embodiment 1

[0035] The preparation method of the polytrimethylene carbonate in the present embodiment, comprises the following steps:

[0036] 0.99g trimethylene carbonate (TMC) and 0.081ml diethylzinc (its weight ratio accounts for 1wt%) are packed into ampoule, it is immersed in liquid nitrogen, after utilizing vacuum pump to vacuum-seal the ampoule, at 60 Stir and heat at ℃ for 24 hours. After the reaction is over, add chloroform. After the unreacted monomer is dissolved, add methanol to precipitate under cooling, filter the precipitate, wash with methanol, and dry in vacuum to obtain polytrimethylene carbonate. (Poly trimethylene carbonate, PTMC), the production rate is 90%.

[0037] The molecular weight of the obtained PTMC is different when the dosage of the initiator is different. The results are shown in Table 2.

[0038] Table 2

[0039]

[0040]

Embodiment 2

[0042] The preparation method of the polytrimethylene carbonate in the present embodiment, comprises the following steps:

[0043] 3g of trimethylene carbonate (TMC) and 20 μl of stannous ethylhexanoate (0.0008wt% by weight) were packed into an ampoule, immersed in liquid nitrogen, and vacuum-sealed using a vacuum pump, the ampoule was Stir and heat at 130°C for 72 hours. After the reaction is over, add chloroform. After the unreacted monomers are dissolved, add methanol to precipitate under cooling, filter the precipitate, wash with methanol, and vacuum dry to obtain PTMC. The yield is 90%.

[0044] The molecular weight of the obtained PTMC is different when the dosage of the initiator is different, and the results are shown in Table 3.

[0045] table 3

[0046] Initiator (wt%) mn mw PDI (20μl, 0.0008wt%) 46,132 104,237 2.26 (100μl, 0.004wt%) 53,782 114,684 2.13

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Abstract

The invention provides a solid polymeric electrolyte and a preparation method thereof, and a lithium ion secondary battery, belonging to the technical field of lithium ion secondary batteries. The solid polymeric electrolyte comprises polytrimethylene carbonate polymerized from trimethylene carbonate, a plasticizer, a lithium salt, a bridging agent and a second initiator. The invention also relates to the preparation method for the above solid polymeric electrolyte, and the lithium ion secondary battery. Compared with the prior art, the solid polymeric electrolyte of the invention has the advantage that the solid polymeric electrolyte is applicable to preparation of the lithium ion secondary battery with high capacity and high voltage. The preparation method is simple and convenient in process, low in cost and easy for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a solid polymer electrolyte, a preparation method thereof, and a lithium-ion secondary battery. Background technique [0002] With the development of portable electronic devices such as portable electronic devices and electric vehicles, lithium-ion secondary batteries are not only required to have high energy density and long life of charge-discharge cycles, but also to increase safety requirements. [0003] Traditional lithium-ion secondary batteries use liquid electrolyte solutions, which mainly include organic solvents and lithium salts. When a lithium-ion secondary battery operates at a high rate, due to the high operating temperature, it is easy to cause leakage of the electrolyte solution and even cause combustion or explosion. [0004] The solid electrolyte can realize the functions of the electrolyte and the diaphragm at the same time, does not re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2220/20H01M2220/30H01M2300/0082Y02E60/10
Inventor 王斌秀
Owner 山西长韩新能源科技有限公司
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