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Lithium ion battery positive electrode material, lithium ion battery positive pole plate and lithium ion battery

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting the driving safety of electric vehicles, poor high temperature performance, and low energy density.

Inactive Publication Date: 2018-01-09
SHANGHAI HUAPU AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the lithium iron phosphate / graphite system battery has good safety, its energy density is only about 120Wh / kg; although the lithium manganese oxide / graphite system battery has good safety, it has low energy density and poor high-temperature performance; Although the lithium cobalt manganese oxide / graphite system battery has high energy density, its safety is poor, and it is difficult to pass acupuncture and overcharge tests at the current technical level, which seriously affects the driving safety of electric vehicles
[0004] Lithium-ion batteries made of current lithium-ion battery cathode materials cannot balance energy density and safety. How to obtain lithium-ion batteries with high energy density and high safety has become an urgent problem to be solved.

Method used

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  • Lithium ion battery positive electrode material, lithium ion battery positive pole plate and lithium ion battery
  • Lithium ion battery positive electrode material, lithium ion battery positive pole plate and lithium ion battery
  • Lithium ion battery positive electrode material, lithium ion battery positive pole plate and lithium ion battery

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Embodiment 13

[0086] Except for Example 13, the graphene used in each embodiment and comparative example is prepared by the above-mentioned Hummers method, and the specific surface area of ​​graphene is 36~38m 2 / g.

Embodiment 1

[0088] A lithium ion battery positive electrode material, the lithium ion battery positive electrode material is composed of the following components in mass percentage: positive electrode active material 97.5%, conductive agent 0.8% and binder 1.7%;

[0089] The positive electrode active material is composed of the following components in mass percentage: 10% lithium manganese iron phosphate and 90% nickel cobalt lithium manganese oxide;

[0090] Among them, lithium manganese iron phosphate is LiMn 0.6 Fe 0.4 PO 4 , D50 is 20μm, specific surface area is 30m 2 / g;

[0091] Lithium nickel cobalt manganate is Li(Ni 0.6 co 0.2 mn 0.2 )O 2 , D50 is 10μm, specific surface area is 0.3m 2 / g;

[0092] The conductive agent is graphene;

[0093] The binder is a combination of polyvinyl fluoride and polyvinylidene fluoride.

Embodiment 2

[0095] A lithium ion battery positive electrode material, the lithium ion battery positive electrode material is composed of the following components in mass percentage: positive electrode active material 98%, conductive agent 0.5% and binder 1.5%;

[0096] The positive electrode active material is composed of the following components in mass percentage: 50% of lithium manganese iron phosphate and 50% of nickel-cobalt lithium manganese oxide;

[0097] Among them, lithium manganese iron phosphate is LiMn 0.7 Fe 0.3 PO 4 , D50 is 30μm, specific surface area is 20m 2 / g;

[0098] Lithium nickel cobalt manganate is Li(Ni 0.8 co 0.1 mn 0.1 )O 2 , D50 is 15μm, specific surface area is 0.1m 2 / g;

[0099] The conductive agent is graphene;

[0100] The binder is polytetrafluoroethylene.

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Abstract

The invention discloses a lithium ion battery positive electrode material, a lithium ion battery positive pole plate and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery positive electrode material mainly comprises the following constituents based on percent by mass: 97.5-98.5% of positive active substance, 0.3-0.8% of conductive agent and1-2% of binding agent, wherein the positive active substance comprises 10-50wt% of lithium ferric manganese phosphate and 50-90wt% of Ni-Co lithium manganate, the lithium ferric manganese phosphate is LiMn<x>Fe<1-x>PO4, x is more than 0.5 but less than 1, the Ni-Co lithium manganate is Li(NixCoyMnz)O2, the conductive agent comprises graphene, and the graphene accounts for 40-100% of the mass of the conductive agent. By the lithium ion battery positive electrode material, the problem that the energy density and the safety of a traditional lithium battery cannot be compatible is solved. By improving the active substance and the conductive agent in the positive electrode material, the positive electrode composite material compatible with the energy density and the safety, the positive pole plate and the lithium battery are obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode material, a lithium ion battery cathode sheet and a lithium ion battery. Background technique [0002] With the development of the pure electric vehicle industry, higher requirements are put forward for its energy storage device-lithium-ion batteries, and the most concerned issues of consumers are the mileage and safety of use. The energy density of the battery (the ratio of battery energy to battery weight) is an important performance indicator of the battery, which is closely related to the cruising range of the electric vehicle. [0003] Existing lithium-ion battery cathode materials for pure electric vehicles include lithium iron phosphate, lithium manganese oxide, nickel-cobalt lithium manganese oxide, and the like. Among them, although the lithium iron phosphate / graphite system battery has good safety, its energy density is only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 叶邦斌林栋汪小云杨建国许俊
Owner SHANGHAI HUAPU AUTOMOBILE CO LTD
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