High-safety lithium manganese iron phosphate battery

A lithium iron manganese phosphate, high-safety technology, applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problem that the specific energy is difficult to exceed, the cycle life is poor, and it cannot fully meet the development of power lithium-ion batteries. needs, etc.

Active Publication Date: 2016-11-16
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used power lithium-ion battery systems at home and abroad are mainly lithium iron phosphate system and ternary (nickel-manganese-cobalt or nickel-cobalt-aluminum three metal elements) system, but these two systems have obvious advantages and disadvantages, and cannot be completely Meet the needs of the development of power lithium-ion batteries
Lithium iron phosphate battery has excellent cycle life and safety performance, but the specific energy is difficult to exceed ...

Method used

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  • High-safety lithium manganese iron phosphate battery
  • High-safety lithium manganese iron phosphate battery
  • High-safety lithium manganese iron phosphate battery

Examples

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Embodiment 1

[0033] In this embodiment, the laminated flexible packaging battery process is used for manufacturing.

[0034] In this embodiment, the content of the positive active material is 20% by weight of lithium manganese iron phosphate and 80% by weight of lithium nickel cobalt manganate.

[0035] The manufacturing method of the positive pole piece in this embodiment is:

[0036] 1) Material baking: Weigh the lithium iron manganese phosphate, lithium nickel cobalt manganate, polyvinylidene fluoride, conductive carbon black, and graphene solutions according to 19wt%: 75.3wt%: 3wt%: 2wt%: 0.7wt%. The powders of lithium iron manganese phosphate, lithium nickel cobalt manganate and conductive carbon black were vacuum-baked at 120°C for 8 hours, and polyvinylidene fluoride (molecular weight 1 million to 1.1 million) powders were vacuum-baked at 80°C. Bake for 4 hours, use a cassette furnace to measure the moisture content and then cool to below 40°C for use.

[0037] 2) Glue preparation: add 1 p...

Embodiment 2

[0047] In this embodiment, the laminated flexible packaging battery process is used for manufacturing.

[0048] In this embodiment, the content of the positive electrode active material is 30% by weight of lithium iron manganese phosphate and 70% by weight of lithium nickel cobalt manganate.

[0049] The manufacturing method of the positive pole piece in this embodiment is:

[0050] 1) Material baking: Weigh out lithium iron manganese phosphate, lithium nickel cobalt manganate, polyvinylidene fluoride, conductive carbon black, and graphene solutions according to 28.2 wt%: 65.8 wt%: 3 wt%: 2 wt%: 1 wt%. The powders of lithium iron manganese phosphate, lithium nickel cobalt manganate and conductive carbon black were vacuum-baked at 120°C for 8 hours, and polyvinylidene fluoride (molecular weight 1 million to 1.1 million) powders were vacuum-baked at 80°C. Bake for 4 hours, use a cassette furnace to measure the moisture content and then cool to below 40°C for use.

[0051] 2) Glue prepa...

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Abstract

The invention belongs to the technical field of lithium ion batteries and specifically relates to a high-safety lithium manganese iron phosphate battery. The high-safety lithium manganese iron phosphate battery comprises a positive plate, a negative plate, an isolating membrane, an electrolyte and a battery shell, wherein the positive plate includes a positive pole current collector and a positive pole active material layer which is coated on a surface of the positive pole current collector; the positive pole active material layer includes the following components by weight percentage: 90wt%-96wt% of positive pole active material, 1.5wt%-5wt% of positive pole conductive agent and 2wt%-5wt% of positive pole binding agent; the positive pole conductive agent is a mixture of conductive carbon black and at least one of a carbon nano tube or graphene; and the ratio of the conductive carbon black to at least another conductive agent is 1wt%:0.5wt% to 4wt%:1wt% based on the weight percentage in the positive pole active material layer; the isolating membrane is one of a polyolefin film or a non-woven cloth film; and the electrolyte is a high-temperature-resistant electrolyte. Compared with a nickel cobalt lithium manganate ternary battery and a lithium iron phosphate battery, the high-safety lithium manganese iron phosphate battery has relatively high weight specific energy and relatively high safety performance at the same time, has a long cycle life and is suitable for popularization and application in the field of new energy vehicles.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a high-safety lithium iron manganese phosphate battery. Background technique [0002] Since 2015, my country's automotive power lithium-ion battery market has experienced explosive growth. At the same time, the application market has increasingly strict requirements on the performance of lithium-ion batteries, especially the new national standard for power batteries for electric vehicles released in May 2015, which puts forward higher requirements for battery safety. [0003] Safety and energy density, as key indicators of power lithium-ion batteries, have always been the focus of research and solutions in the industry. At present, the most widely used power lithium-ion battery systems at home and abroad are mainly lithium iron phosphate and ternary (three metal elements of nickel, manganese, cobalt or nickel, cobalt, aluminum), but these two systems have obvio...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/42H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/58H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 吕循峰刘勇廖崇静方坤
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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