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Lithium ion battery cathode active substance and manufacturing method thereof

A negative electrode active material and ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle stability decline, increase irreversible capacity, etc., and achieve the effect of low temperature and low energy consumption

Inactive Publication Date: 2015-04-29
湘潭中大新材料科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

What's more, the electrolyte is easy to co-intercalate with lithium ions during the process of embedding lithium ions, and the electrolyte is reduced during the process of moving out, and the generated gas products cause graphite flakes to peel off, resulting in the further formation of a solid electrolyte film and increasing the irreversible capacity. , while the cycle stability decreases

Method used

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  • Lithium ion battery cathode active substance and manufacturing method thereof
  • Lithium ion battery cathode active substance and manufacturing method thereof

Examples

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specific Embodiment 1

[0070] This embodiment is an example to prepare the positive electrode active material. First, add 0.2 moles of ferric nitrate to 200ml of deionized water to dissolve. After it is completely dissolved, add 0.2 moles of phosphoric acid, and then add 100ml of a pre-configured lithium hydroxide aqueous solution containing 0.2 moles to make the lithium ion in the solution: iron Ion: Phosphate ion by LiFePO 4 The metering ratio (1:1:1) is mixed, and after the complete mixing reaction, a metal ion containing Fe, Li + and (PO 4 ) 3- solution; and then dry the solution to obtain powdered starting material. The powdered starter is placed in an alumina crucible, and then the crucible is placed in a microwave sintering furnace with a microwave frequency of 2.45 GHz to make it burn at 700 °C under nitrogen. 0 C and processed for 0.5 hour to obtain lithium iron phosphate powder that can be used as positive electrode active material.

specific Embodiment 2

[0071] A negative electrode active material layer is fabricated. First, 35g of graphite carbon powder, 15g of copper powder, 2g of phosphorus powder and 52g of tin powder were thoroughly mixed to obtain a mixture. The lid mixture was placed in a quartz cauldron, and ground by a ball mill in nitrogen for 20 hours, thereby pulverizing it to obtain copper-phosphorus-carbon-tin powder.

specific Embodiment 3

[0072] How to make a lithium battery. First, mix the lithium iron phosphate powder prepared in Example 1 with carbon black and polyvinyl difluoride binder in proportion (83:10:7), and then cover it on a 10um aluminum foil. After 120 0 After drying at C for 6 hours, the positive electrode was obtained. And the copper-phosphorus-carbon-tin powder prepared in Example 2 is mixed with carbon black and polyvinyl difluoride binder, and the ratio of Yi (83:10:7) is evenly mixed, and then coated on a 10um aluminum foil, after 120 0 After drying at C for 6 hours, the negative electrode was obtained.

[0073] The separator layer is composed of a microporous polyethylene film of 25um and then wound up several times after being stacked in the order of negative electrode, separator layer and positive electrode. Next, mix 40 weight percent of 4-fluoro, 3-dioxolane-2-one (FEC), 45 weight percent of dimethyl carbonate (DMC), 15 weight percent of electrolyte LiPF 6 And adjust the electrolyte...

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Abstract

The invention discloses a lithium ion battery cathode active substance and a manufacturing method thereof. A cathode active substance layer consists of the following components in percentage by weight: 20-50% of carbon (C), 20% of copper (Cu), 1-5% of phosphorus (P) and the balance being tin (Sn). By taking the tin-carbon-copper-phosphorus alloy as a cathode active substance, the lithium battery has high capacitance maintenance characteristic in high load and low load. According to the manufacturing method of the lithium ion battery cathode active substance, the heating temperature is low, and the energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to an ion battery negative electrode active material and a manufacturing method thereof. Background technique [0002] With the increasing popularity of portable electronic products and the miniaturization of electronic devices, batteries are required to have smaller volumes and higher energy output ratios. Lithium-ion batteries are widely used in electronic products due to their high energy density. [0003] The key to high energy density batteries lies in the development of electrode materials with high load capacity. For reversible electrode materials, materials with open structures such as layered or tunnel structures are most suitable, which provide easy access and fast mobility for lithium ions. [0004] At present, the anode materials of lithium-ion batteries on the market use graphite carbon materials, because of the characteristics and partial disord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/58
CPCH01M4/387H01M10/0525Y02E60/10
Inventor 尹柏春
Owner 湘潭中大新材料科技开发有限公司
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