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Secondary battery electrode material, preparation method and use thereof

A technology of secondary batteries and electrode materials, applied in the field of materials, can solve the problems of low specific capacity and low working voltage of positive electrode materials

Inactive Publication Date: 2017-03-15
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these batteries also face the problems of low specific capacity and low working voltage of cathode materials, so the development of new high-performance cathode materials is also an urgent need to improve the performance of these new secondary batteries

Method used

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  • Secondary battery electrode material, preparation method and use thereof
  • Secondary battery electrode material, preparation method and use thereof
  • Secondary battery electrode material, preparation method and use thereof

Examples

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Embodiment 1

[0039] Embodiment 1 of the present invention provides a class of electrode materials for secondary batteries, whose general chemical formula is:

[0040] Li x C y B z D. w ;

[0041] Wherein, C is carbon; B is an element for doping and replacing Li, including any one or more of Na, K, Be, Mg, Ca, Al; D is an element for doping and replacing C, including Any one or more of Si, B, N, P, As, O, S; x, y, z, w are respectively used to represent the atomic ratio of the corresponding element; the x, y, z, w Satisfy: 0≤x+z, y+w≤3, 0≤x, y, z, w≤3.

[0042] It should be noted that the electrode material Li x C y B z D. w The doping substituting element B in can replace part or all of Li; the D element can replace part or all of C; B and D can replace only one element or two elements at the same time.

[0043]The electrode materials provided by the embodiments of the present invention are mainly used in lithium-ion secondary batteries, and can also be used in secondary batterie...

Embodiment 2

[0045] This embodiment provides a preparation method of a type of electrode material for a secondary battery, specifically a discharge plasma sintering method, such as figure 1 shown, including:

[0046] Mix the required lithium powder, carbon powder, B and D in proportion, and grind them evenly to form a precursor;

[0047] Specifically, B is an element for doping and replacing Li, including any one or more of Na, K, Be, Mg, Ca, and Al; D is an element for doping and replacing C, including Si, B , any one or more of N, P, As, O, S;

[0048] Cold pressing the precursor to obtain a rough body of the precursor;

[0049] The rough billet is placed in a vacuum discharge plasma sintering device, and heat-treated at 600°C for 1 hour to obtain a coarse-grained ingot;

[0050] Pulverize the coarse-grained ingot in a glove box, then put it into a ball milling device, and perform high-energy ball milling to obtain a precursor powder;

[0051] The precursor powder was placed in a vac...

Embodiment 3

[0054] This embodiment provides a preparation method of an electrode material for a class of secondary batteries, specifically a solid-phase method, such as figure 2 shown, including:

[0055] Mix the required lithium powder, carbon powder, B and D in proportion, and grind them evenly to form a precursor powder;

[0056] Specifically, B is an element for doping and replacing Li, including any one or more of Na, K, Be, Mg, Ca, and Al; D is an element for doping and replacing C, including Si, B , any one or more of N, P, As, O, S;

[0057] The precursor powder was placed in a tube furnace, and heat-treated in an argon atmosphere at 600° C. for 5 hours to obtain the electrode material.

[0058] The method for preparing an electrode material for a secondary battery provided in this embodiment can be used to prepare the electrode material described in Embodiment 1 above. The method provided in this example is simple, the process is easy to control, and the synthesis temperature...

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Abstract

The invention discloses a secondary battery electrode material, a preparation method and use thereof. The chemical general formula of the electrode material is LixCyBzDw; specifically, C is carbon; B is a element doping and substituting Li, and includes any one or more of Na, K, Be, Mg, Ca and Al; D is a element doping and substituting C, and includes any one or more of Si, B, N, P, As, O and S; x, y, z and w respectively represent the atomic ratios of corresponding elements; and x, y, z and w satisfy the relation that: the sum of x and z is greater than or equal to 0, the sum of y and w is smaller than or equal to 3, x, y and z are greater than or equal to 0, and w is smaller than or equal to 3.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a class of secondary electrode materials and a preparation method and use thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in 1991, the energy density of energy-type lithium-ion batteries has increased from the initial 90Wh / kg to 210Wh / kg, which still cannot reach the energy density (500Wh / kg) required by power batteries. Among them, the electrode material is an important factor that limits the improvement of the energy density of lithium-ion batteries. At present, the commonly used cathode materials are divided into two categories, one is transition metal oxides (such as lithium cobalt oxide, lithium manganese oxide), and the other is polyanion compounds (such as lithium iron phosphate). Their actual specific capacity has always hovered between 100-180mAh / g, which has become a bottleneck for improving the energy density of lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525H01M10/054
CPCH01M4/587H01M10/0525H01M10/054Y02E60/10
Inventor 田娜王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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