Non-aqueous electrolyte and lithium titanate battery

Abstract

The invention relates to non-aqueous electrolyte. The non-aqueous electrolyte comprises lithium salt, solvent and additives, wherein the additives include an additive A and an additive B, the mass percent of the additive A in the electrolyte is 0.01 to 10 percent, the mass percent of the additive B in the electrolyte is 0.01 to 10 percent, the structural formula of the additive A is as follows (which is specified in the description), R1, R2 and R3 are respectively an alkyl group of C1 to C3, and R4 is a linear-chain or branch-chain alkyl group of C1 to C5; the chemical formula of the additive B is CH3O(CH2CH2O)mCH3, and m is an integer of 1 to 6. By improving the non-aqueous electrolyte, the electrolyte can remarkably inhibit the inflation problem of the lithium titanate battery, so that the battery adopting the lithium titanate as a negative electrode has good cyclicity and magnification charging-discharging property.

Description

Technical field

[0001] The invention belongs to the technical field of materials, and specifically relates to a non-aqueous electrolyte and a lithium titanate battery. Background technique

[0002] At present, most of the commercial anode materials for lithium-ion batteries use carbon materials that can insert and release lithium. Carbon materials as anode materials for lithium-ion batteries have some disadvantages: the potential of the carbon anode is very close to that of lithium metal, and it is easy to fail when the battery is overcharged. Lithium is deposited on the surface of the negative electrode, and lithium dendrites are generated to pierce the diaphragm, causing internal short-circuits in the battery to burn and explode. This makes lithium-ion batteries have a great safety hazard during use.

[0003] In order to improve the safety of lithium-ion batteries, it is necessary to find a new type of negative electrode material that has a slightly positive lithium insertion and...

Examples

Embodiment 1

[0025] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyl triethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 1wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte. (Tetraglyme).

[0026] The electrolyte was injected into a 340mAh NMC / LTO aluminum shell battery, and the battery was formed by charging and discharging at 0.1C, and then charging and discharging at 1C for 2000 weeks to test its capacity retention and thickness. The results are shown in Table 1.

Embodiment 2

[0028] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyltriethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 2wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte (Tetraglyme).

[0029] The electrolytic solution described above was formed under the same conditions as in Example 1, and then a 1C charge-discharge cycle was performed under the same conditions as in Example 1. The results are shown in Table 1.

Embodiment 3

[0031] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyl triethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 3wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte. (Tetraglyme).

[0032] The electrolytic solution described above was formed under the same conditions as in Example 1, and then a 1C charge-discharge cycle was performed under the same conditions as in Example 1. The results are shown in Table 1.

Technical field

[0001] The invention belongs to the technical field of materials, and specifically relates to a non-aqueous electrolyte and a lithium titanate battery. Background technique

[0002] At present, most of the commercial anode materials for lithium-ion batteries use carbon materials that can insert and release lithium. Carbon materials as anode materials for lithium-ion batteries have some disadvantages: the potential of the carbon anode is very close to that of lithium metal, and it is easy to fail when the battery is overcharged. Lithium is deposited on the surface of the negative electrode, and lithium dendrites are generated to pierce the diaphragm, causing internal short-circuits in the battery to burn and explode. This makes lithium-ion batteries have a great safety hazard during use.

[0003] In order to improve the safety of lithium-ion batteries, it is necessary to find a new type of negative electrode material that has a slightly positive lithium insertion and...

Examples

Embodiment 1

[0025] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyl triethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 1wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte. (Tetraglyme).

[0026] The electrolyte was injected into a 340mAh NMC / LTO aluminum shell battery, and the battery was formed by charging and discharging at 0.1C, and then charging and discharging at 1C for 2000 weeks to test its capacity retention and thickness. The results are shown in Table 1.

Embodiment 2

[0028] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyltriethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 2wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte (Tetraglyme).

[0029] The electrolytic solution described above was formed under the same conditions as in Example 1, and then a 1C charge-discharge cycle was performed under the same conditions as in Example 1. The results are shown in Table 1.

Embodiment 3

[0031] In a glove box filled with argon (H 2 O 6 ) In which, 3wt% of 3-thiocyanatopropyl triethoxysilane TETS (Triethoxy(3-thiocyanatopropyl)silane) and 3wt% of tetraethylene glycol dimethyl ether TTG are added to the electrolyte. (Tetraglyme).

[0032] The electrolytic solution described above was formed under the same conditions as in Example 1, and then a 1C charge-discharge cycle was performed under the same conditions as in Example 1. The results are shown in Table 1.

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