Power lithium battery containing graphene

A lithium battery and graphene technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as not being able to meet the needs of power lithium batteries, unsatisfactory high-temperature cycle performance, and poor high-temperature effects, etc., to achieve Excellent cycle performance, excellent low-temperature performance, and performance-enhancing effect

Active Publication Date: 2017-12-15
LINKDATA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a graphene-containing power lithium battery to solve the problem of using LiPF in existing lithium-ion batteries. 6 The electrolyte composed of / EC+DMC+EMC, low and high temperature cycle performance is not ideal, and the high temperature effect is relatively poor, which can no longer meet the needs of power lithium batteries and other issues

Method used

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  • Power lithium battery containing graphene
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preparation example Construction

[0031] The preparation method of the modified graphene comprises the following steps: S1: the graphene is subjected to a magnetic field strength of 4800-7000GS, an ultrasonic power of 220-580W, a temperature of 40-56°C, and a rotation speed of 200-300r / min, Stir for 15-42min to obtain graphene energy powder;

[0032] S2: Add sodium dodecylbenzenesulfonate to the graphene energy powder prepared in step S1, and modify it for 1-2 hours at a temperature of 52-75°C and a rotational speed of 90-150r / min to obtain modified graphite alkene;

[0033] The additive a is in parts by weight and includes the following raw materials: 4-10 parts of glyceryl monostearate, 2-4 parts of sucrose ester, 1-2 parts of polyoxyethylene-polyoxypropylene copolymer, 3 parts of polysorbate -5 copies;

[0034] The additive b is in parts by weight, including the following raw materials: 7-15 parts of ethylene glycol dimethacrylate, 2-6 parts of tetramethylsiloxane;

[0035] The additive c includes the fo...

Embodiment 1

[0044] A power lithium battery containing graphene, including an electrode group and a power lithium battery electrolyte, the electrode group and the power lithium battery electrolyte are sealed in a battery case, the electrode group includes a positive electrode, a negative electrode and a separator, the power lithium battery electrolyte Lithium battery electrolyte, in parts by weight, including the following raw materials: 4 parts of lithium hexafluorophosphate, 34 parts of ethyl methyl carbonate, 20 parts of dimethyl carbonate, 12 parts of butylene carbonate, 10 parts of dipropyl carbonate, 7 parts of ethyl formate 6 parts, 6 parts of propyl acetate, 12 parts of 1,2-dimethoxyethane, 0.8 parts of modified graphene, 0.7 parts of additive a, 0.4 parts of additive b, 0.3 parts of additive c, 0.2 parts of additive d, and 0.2 parts of additive e0 .5 copies;

[0045] The preparation method of the modified graphene comprises the following steps: S1: Stir the graphene for 30 minutes...

Embodiment 2

[0058] A power lithium battery containing graphene, including an electrode group and a power lithium battery electrolyte, the electrode group and the power lithium battery electrolyte are sealed in a battery case, the electrode group includes a positive electrode, a negative electrode and a separator, the power lithium battery electrolyte Lithium battery electrolyte, in parts by weight, including the following raw materials: 2.2 parts of lithium hexafluorophosphate, 28 parts of ethyl methyl carbonate, 16 parts of dimethyl carbonate, 8 parts of butylene carbonate, 6 parts of dipropyl carbonate, 5 parts of ethyl formate 4 parts of propyl acetate, 10 parts of 1,2-dimethoxyethane, 0.6 parts of modified graphene, 0.5 parts of additive a, 0.3 parts of additive b, 0.2 parts of additive c, 0.2 parts of additive d, and additive e 0.3 copies;

[0059] The preparation method of the modified graphene comprises the following steps: S1: Stir the graphene for 42 minutes at a magnetic field s...

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Abstract

The invention discloses a power lithium battery containing graphene. The power lithium battery comprises an electrode group and a power lithium battery electrolyte solution, the electrode group and the power lithium battery electrolyte solution are sealed in a battery shell, the electrode group includes a positive electrode, a negative electrode and a diaphragm, the power lithium battery electrolyte solution comprises the following raw materials by weight: 2-6 parts of lithium hexafluorophosphate, 26-40 parts of ethyl methyl carbonate, 16-25 parts of dimethyl carbonate, 8-15 parts of butylidene carbonate, 6-12 parts of dipropyl carbonate, 5-8 parts of ethyl formate, 4-9 parts of propyl acetate, 10-14 parts of 1, 2-dimethoxyethane, 0.6-1 part of modified graphene, and 0.5-0.8 part of an additive a. The power lithium battery prepared from the power lithium battery electrolyte solution provided by the invention has excellent high and low temperature performance and cycle performance. The power lithium battery electrolyte solution provided by the invention is worth popularizing and applying.

Description

【Technical field】 [0001] The invention belongs to the technical field of batteries, and in particular relates to a graphene-containing power lithium battery. 【Background technique】 [0002] In recent years, with the rapid development of the lithium battery industry, lithium-ion batteries have gradually entered the application fields of electric vehicles and large mobile power supplies, but currently lead-acid batteries still occupy a dominant position. Lithium-ion battery cathode materials are usually lithium cobaltate, lithium manganate, lithium nickelate and various transition metal oxides doped with other elements. As a power battery, lithium manganese oxide has gradually exerted its advantages and become one of the mainstream cathode materials. Lithium-ion battery electrolyte occupies a very important position in lithium-ion batteries, which directly affects the electrical performance of lithium-ion batteries. At present, the electrolyte composition of lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/0568H01M10/4235Y02E60/10
Inventor 吴苗
Owner LINKDATA NEW ENERGY CO LTD
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