Gel polymer electrolyte and preparation method thereof and polymer battery
A gel polymer and electrolyte technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of poor safety performance and cycle performance, low ionic conductivity, and poor mechanical strength of polymer batteries. Excellent cycle performance and safety performance, the effect of improving ionic conductivity and improving mechanical strength
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[0046] The present invention also provides a preparation method of gel polymer electrolyte, comprising the following steps:
[0047] 1) dissolving the lithium salt in an organic solvent to obtain a lithium salt organic solution;
[0048] 2) adding layered double metal hydroxide to the lithium salt organic solution, stirring until the layered double metal hydroxide is stripped by the lithium salt organic solution;
[0049] 3) Add polysiloxane to the mixture in step 2), and disperse evenly to obtain a layered double metal hydroxide modified polysiloxane electrolyte; the polysiloxane has the following structure:
[0050] R 1 -(CH 2 ) m -[Si(R 2 R 3 )-O] i -Si(R 2 R 3 )-(CH 2 ) n -R 4
[0051] Among them, R 2 , R 3 Each independently is H, C 1-3 aliphatic alkyl or C 1-3 Aliphatic alkoxy; R 1 for-OCOCR 5 =CR 6 、-CH(OCOCR 5 =CR 6 ) 2 or -C(OCOCR 5 =CR 6 ) 3 ,R 4 for-OCOCR 7 =CR 8 、-CH(OCOCR 7 =CR 8 )2 or -C(OCOCR 7 =CR 8 ) 3 , where R 5 -R 8 Choose...
Embodiment 1
[0066] (1) 6.4g Mg(NO 3 ) 2 ·6H 2 O and 4.69gAl(NO 3 ) 3 9H 2 Add O to 28ml double distilled water to form a mixed solution A, and prepare 2M NaOH and 0.2M NaNO 3 The mixed solution B, slowly drop the A solution into the B, and the dropping time is 1.5 hours. Then the above mixture was stored at 65°C for 5 days, centrifuged and dried at 40°C to obtain Mg-Al LDH.
[0067] (2) Lithium salt LiCF 3 SO 3 Dissolve in an organic solvent (volume ratio PC:EC=4:1) to prepare a 0.5M lithium salt organic solution; add the Mg-Al LDH prepared in step (1) to the lithium salt organic solution, and stir at a speed of about 600rpm In 2 days, the LDH stripping solution was obtained; in the LDH stripping solution, polysiloxanes shown in formula 1 were added, wherein the weight ratio was lithium salt organic solution: Mg-Al LDH: polysiloxane=100:5:2, and then Add 2% initiator BPO based on the weight of the polysiloxane, and mix evenly to obtain an electrolyte precursor.
[0068] (3) Take...
Embodiment 2
[0071] The same steps as in Example 1 were used to prepare the polymer battery of this example, except that:
[0072] In step (1), Ca-Al LDH is used to replace Mg-Al LDH in Example 1; the preparation method of Ca-Al LDH is as follows:
[0073] Will CaNO 3 4H 2 O and 46.8gAl(NO 3 ) 3 9H 2 O was dissolved in 325ml double distilled water to form mixed solution A, 25gNaOH and 36.4gNaNO 3 Dissolve B solution in 175ml of double distilled water, slowly drop A solution into B, and the dropping time is 1.5 hours. Then the above mixture was stored at 65°C for 5 days, centrifuged and dried at 40°C to obtain Ca-Al LDH.
[0074] Through the above steps, the gel polymer electrolyte and polymer battery of this embodiment were obtained, which were denoted as A2 and B2, respectively.
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