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Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material

A multi-layer graphene, lithium iron phosphate technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor high-rate charge-discharge performance and poor conductivity, and achieve good conductivity, increased surface area, and reduced interface. Effect of Current Density

Inactive Publication Date: 2012-01-04
HARBIN INST OF TECH
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor electrical conductivity of existing lithium iron phosphate materials and poor high-rate charge-discharge performance of lithium-ion batteries using it as the positive electrode material. The present invention provides a multilayer graphene / lithium iron phosphate intercalation Composite material, its preparation method and lithium ion battery using it as cathode material

Method used

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  • Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material
  • Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material
  • Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material

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specific Embodiment approach 1

[0014] Embodiment 1: This embodiment is a multilayer graphene / lithium iron phosphate intercalation composite material, which adopts multilayer graphene, ferric salt, phosphorus source compound, lithium source compound and organic small molecule carbon source The composite precursor is prepared by the rheological phase method, and then the composite precursor is sintered, wherein the molar ratio of Fe in the ferric salt to P in the phosphorus source compound is 1:1, Li in the lithium source compound and P in the phosphorus source The molar ratio of P in the compound is 1 to 1.1:1, the mass ratio of the organic small molecule carbon source to the theoretical yield of lithium iron phosphate is 0.4 to 0.8:1, and the mass ratio of the multilayer graphene to the theoretical yield of lithium iron phosphate is 0.005 ~0.3:1.

[0015] In this embodiment, the sandwich structure of the multilayer graphene / lithium iron phosphate intercalation composite material plays a positive role in imp...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the ferric salt is ferric nitrate or ferric chloride, the phosphorus source compound is ammonium dihydrogen phosphate or ammonium monohydrogen phosphate, and the lithium source The compound is one or a mixture of lithium nitrate, lithium carbonate and lithium hydroxide, and the organic small molecule carbon source is sucrose and / or glucose. Other parameters are the same as in the first embodiment.

[0018] In the present embodiment, when the lithium source compound is a mixture, it is mixed in an arbitrary ratio. When the organic small molecule carbon source is a mixture of the two, sucrose C 12 h 22 o 11 with glucose C 6 h 12 o 6 The molar ratio of the mixture is 1:2-4.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass ratio of the organic small molecule carbon source to the theoretical yield of lithium iron phosphate is 0.5-0.7:1. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

[0020] In this embodiment, the optimal mass ratio of the organic small molecule carbon source to the theoretical yield of lithium iron phosphate is 0.6:1.

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Abstract

The invention relates to a lithium iron phosphate intercalated composite material, a preparation method thereof and a lithium ion battery adopting the multi-layer graphene / lithium iron phosphate intercalated composite material as an anode material. In the prior art, the electronic conductivity of the lithium iron phosphate material is poor, high-rate charging / discharging capacity of the lithium ion battery adopting the lithium iron phosphate material as the anode material is poor. The purpose of the present invention is to solve the problems in the prior art, and improve the rapid charging capacity of the power lithium ion battery so as to meet the requirements of the pure electrocar. The composite material is prepared through the following steps that: a rheological phase reaction method is adopted for multi-layer graphene, a trivalent iron salt, a phosphorus compound, a lithium compound and carbon source of small organic molecule to obtain a composite precursor, then the precursor is sintered to obtain the multi-layer graphene / lithium iron phosphate intercalated composite material. The anode slurry of the lithium ion battery anode plate comprises the composite material, a conductive agent and polyvinylidene difluoride. The composite material is an intercalated structure, wherein the lithium iron phosphate particles are intercalated between the multi-layer graphene to form the intercalated structure. The trivalent iron salt is adopted as the raw material, such that the cost is reduced. The lithium ion battery has good charging / discharging cycle performance, wherein the specific capacity is more than 60 mA.h.g<-1> at the rate of 20C.

Description

technical field [0001] The invention relates to a lithium iron phosphate composite material, a preparation method and a lithium ion battery using the lithium iron phosphate composite material as a positive electrode material. Background technique [0002] Lithium iron phosphate battery has the advantages of good safety, long cycle life, and environmental friendliness, and is an ideal power system for driving electric vehicles. However, in terms of high rate performance, the current lithium iron phosphate battery is still difficult to meet the requirements of fast charging for batteries of pure electric vehicles and plug-in hybrid electric vehicles, which restricts the development of the electric vehicle industry. [0003] Graphene has good electrical conductivity, large specific surface area, and outstanding supercapacitive properties. If the nano-layered structure of multi-layer graphene can be used, lithium iron phosphate material can be compounded between the layers of mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/136H01M10/0525
CPCY02E60/122Y02T10/7011Y02E60/10
Inventor 王殿龙王博王秋明王林孙笑寒
Owner HARBIN INST OF TECH
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