CN106129375B - 一种复合锂盐改性电极材料的方法 - Google Patents
一种复合锂盐改性电极材料的方法 Download PDFInfo
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- 229910003002 lithium salt Inorganic materials 0.000 title claims abstract description 48
- 239000007772 electrode material Substances 0.000 title claims abstract description 35
- -1 compound lithium salt Chemical class 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 20
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 229910013553 LiNO Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 239000012298 atmosphere Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910018119 Li 3 PO 4 Inorganic materials 0.000 claims 5
- 239000011593 sulfur Substances 0.000 claims 3
- 229910004283 SiO 4 Inorganic materials 0.000 claims 2
- 239000007770 graphite material Substances 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 239000012299 nitrogen atmosphere Substances 0.000 claims 1
- 238000000859 sublimation Methods 0.000 claims 1
- 230000008022 sublimation Effects 0.000 claims 1
- 238000001308 synthesis method Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 239000000243 solution Substances 0.000 abstract description 3
- 239000008151 electrolyte solution Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 14
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 229910007562 Li2SiO3 Inorganic materials 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910020489 SiO3 Inorganic materials 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910001386 lithium phosphate Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 5
- 229910052909 inorganic silicate Inorganic materials 0.000 description 5
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 229910002986 Li4Ti5O12 Inorganic materials 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 2
- 229910052912 lithium silicate Inorganic materials 0.000 description 2
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Chemical compound [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Chemical compound OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910009728 Li2FeP2O7 Inorganic materials 0.000 description 1
- 229910001367 Li3V2(PO4)3 Inorganic materials 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910013361 LiNixCoyAl1-x-yO2 Inorganic materials 0.000 description 1
- 229910013421 LiNixCoyMn1-x-yO2 Inorganic materials 0.000 description 1
- 229910013427 LiNixCoyMn1−x−yO2 Inorganic materials 0.000 description 1
- 229910013483 LiNixCoyO2 Inorganic materials 0.000 description 1
- 229910013713 LiNixMnyO2 Inorganic materials 0.000 description 1
- 229910000857 LiTi2(PO4)3 Inorganic materials 0.000 description 1
- 229910014886 LixPOy Inorganic materials 0.000 description 1
- 229910014604 LixSiOy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910004589 Na2FeP2O7 Inorganic materials 0.000 description 1
- 229910020293 Na2Ti3O7 Inorganic materials 0.000 description 1
- 229910020657 Na3V2(PO4)3 Inorganic materials 0.000 description 1
- 229910021312 NaFePO4 Inorganic materials 0.000 description 1
- 229910019441 NaTi2(PO4)3 Inorganic materials 0.000 description 1
- 229910019898 NaxMnO2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- QTHKJEYUQSLYTH-UHFFFAOYSA-N [Co]=O.[Ni].[Li] Chemical compound [Co]=O.[Ni].[Li] QTHKJEYUQSLYTH-UHFFFAOYSA-N 0.000 description 1
- QTJOIXXDCCFVFV-UHFFFAOYSA-N [Li].[O] Chemical compound [Li].[O] QTJOIXXDCCFVFV-UHFFFAOYSA-N 0.000 description 1
- OGCCXYAKZKSSGZ-UHFFFAOYSA-N [Ni]=O.[Mn].[Li] Chemical compound [Ni]=O.[Mn].[Li] OGCCXYAKZKSSGZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Composite Materials (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本发明涉及一种复合锂盐改性电极材料的方法，属于能源材料及相关领域。本发明所要解决的问题是固固难分散和锂盐在电解液中难溶解及单一锂盐的缺陷，提供一种复合锂盐提高电极材料电化学性能的方法，能有效实现电极材料或其前驱体与复合锂盐或其前驱体的均匀混合和可控反应。用复合锂盐提高电极材料的性能，克服单一锂盐的不足，可以有效的将电极材料或其前驱体与复合锂盐或其前驱体均匀混合，将反应温度降低，复合锂盐能有效改善电极表界面特性，提高电极材料的电化学性能和安全特性，该工艺方法反应条件温和，反应容易操控，所得改性产品粒度和形貌容易控制，产品性能稳定性好。
Description
技术领域
本发明涉及能源材料及相关领域，具体为一种复合锂盐改性电极材料的方法。
背景技术
智能手机、笔记本电脑和（混合）电动汽车等电子产品，对锂离子电池的能量密度、倍率性能、循环寿命以及安全性的要求越来越高，而电极材料对这些性能举足轻重。电极材料包含正极材料和负极材料，种类较多，目前正极材料主要有钴酸锂、磷酸亚铁锂、镍钴铝氧锂、镍钴锰氧锂、镍钴氧锂、镍锰氧锂、锰酸锂等，负极材料主要有碳基材料、钛酸锂及硅基材料等。其中，作为商业化的锂离子电池负极材料，石墨具有充放电电压平台低、成本低、来源丰富等优点，但是石墨类负极材料循环性能差、体积变化大以及充放电过程中产生的枝晶会导致短路造成安全事故等缺点，这些问题使得碳负极材料难以满足日益发展的电子设备、电动汽车等对高性能锂离子电池的要求。
针对目前电极材料存在的容量低、循环稳定性与倍率特性差等问题，围绕高性能电极材料，人们开展了大量的研究工作，目前主要集中在以下几个方面：第一，对商业化锂离子电池广泛采用的电极材料进行改性，通过表面包覆，制备核壳结构Ｃ/Ｃ复合材料，降低首次不可逆容量，减少溶剂共嵌入、提高电极的电化学性能；第二，制备具有较高比容量和倍率性能的新型碳电极材料（如硬碳、介孔碳等）， 但这类材料往往存在着首次不可逆容量大或循环稳定性差等尚需改善的问题；第三，研究开发新体系的电极材料，包括高储锂能力的合金体系（如FeFy, Si、Ge、 Sn 、Pb、 Al、 Ga、 Sb等）以及纳米金属氧化物等，它们的储锂容量高于目前常用的电极材料。其中，金属锡的理论比容量为990mhA/g，硅为4200mhA/g。但是这类材料在电池充放电过程中，往往伴随着巨大的体积变化。 导致电极循环性能极差，从而阻碍了它们的商业化应用。
硅作为地球上储量丰富的材料，具有较高的理论比容量和较低的电压平台而成为发展前景广阔的锂离子电池负极材料，但是硅负极材料具有较大的体积膨胀效应、低电导率、循环性能差等特点，不能满足实际需要。硅负极在放电过程中，硅与锂离子反应生成的偏硅酸锂等副产物可以减小锂离子的损失。而且，在偏硅酸锂中，SiO4四面体可以形成锯齿链，这种独特的结构使Li2SiO3具有三维的锂离子扩散路径，可以提高锂离子的扩散速率。同时，Li2SiO3是一种化学惰性材料，在有机电解液中结构稳定，可以抑制电解液中HF的侵蚀。另一方面，碳酸锂能够在电极表面形成稳定的固态电解质膜，改善电极的表界面行为，能够提高电极材料的可逆容量和循环性能。但是，碳酸锂很难溶解于有机溶剂。
为了提高目前电极材料的电化学性能和安全性能，本发明创造性的采用复合锂盐对电极材料进行改性，弥补单一锂盐的不足，提高电极材料的电化学性能。
发明内容
本发明所要解决的技术问题是：提供一种复合锂盐改性电极材料的方法，能有效实现电极材料或其前驱体与复合锂盐或其前驱体的均匀混合和可控反应，解决固固难分散和锂盐在电解液中难溶解的问题。
本发明解决其技术问题所采用的技术方案是：
一种复合锂盐改性电极材料的方法，其特征在于：将电极材料或其前驱体和复合锂盐或其前驱体按照活性组分与锂的物质的量比为1：（0.01~5.0）进行配料并混合均匀，混合后在100~700°C下热处理0.5~6.0h，冷却后得到复合锂盐改性产品。
进一步的，所述的复合锂盐指两种及以上锂盐复合物。
进一步的，所述的复合锂盐前驱体指制备复合锂盐的原料或中间产物。
进一步的，所述的电极材料前驱体指制备电极材料的原料或中间产物。
进一步的，所述的电极材料指正极材料和负极材料。
进一步的，所述的活性组分指LiFePO4, Li3V2(PO4)3, Li2FeP2O7, LiTi2(PO4)3,LiNixCoyMn1-x-yO2, LiNixCoyAl1-x-yO2, LiNixMnyO2, LiNixCoyO2, LiMn2O4, LiCoO2,NaxMnO2, NaFePO4, Na2FeP2O7, NaTi2(PO4)3, Na3V2(PO4)3, Na3(VO0.8)2(PO4)2F1.4, S,Li4Ti5O12, Na2Ti3O7, C, Si, Ge, Sn, Pb, Al, Ga, Sb, SiOy, FePy及其复合物。
进一步的，所述的锂盐指LixSiOy, LixPOy, Li2CO3, Li2SO4, LiNO3, CH3COOLi,LiOH, Li4Ti5O12。
进一步的，所述的x、y值为0≤x≤4, 0≤y≤4。
本发明的有益效果是：用复合锂盐提高电极材料的性能，克服单一锂盐的不足，可以有效的将电极材料或其前驱体与复合锂盐或其前驱体均匀混合，将反应温度降低，解决目前电极材料锂盐改性过程中均匀混合、反应过程难以有效调控和锂盐难溶解于有机电解液的问题，改善电极表界面特性，提高电极材料的电化学性能和安全特性，该工艺方法反应条件温和，反应容易操控，所得改性产品粒度和形貌容易控制，产品性能稳定性好。
附图说明
图1由Li4SiO4制备Li2SiO3/Li2CO3复合锂盐改性电极材料的工艺流程图。
图2由实施例1制得的Li2SiO3/Li2CO3复合锂盐改性石墨样品的XRD图谱。
图3由实施例1制得的Li2SiO3/Li2CO3复合锂盐改性石墨样品的充放电曲线图。
图4由实施例1制得的Li2SiO3/Li2CO3复合锂盐改性石墨样品的应力应变图。
具体实施方式
以下结合实施例及附图对本发明作进一步说明，所述内容仅为本发明构思下的基本说明，但是本发明不局限于下面例子，依据本发明的技术方案所作的任何等效变换，均属于本发明的保护范围。
实施例1
采用原位合成法由Li4SiO4制备Li2SiO3/Li2CO3复合锂盐改性石墨，具体工艺如图1所示，首先将石墨和Li4SiO4按照物质的量比分别为1:0、1:0.02、1:0.025、1:0.03进行配料，配料后的混合物通过200rpm转速的机械球磨使二者充分混合，然后将该混合物在500~600℃的Ar气氛中热处理5.0h，冷却后得到Li2SiO3/Li2CO3复合锂盐改性石墨产品。图2为不同Li2SiO3/Li2CO3复合锂盐改性石墨样品的XRD图，图3为不同Li2SiO3/Li2CO3复合锂盐改性石墨样品的充放电曲线图，图4为石墨和Li4SiO4质量比为4:1制备的Li2SiO3/Li2CO3复合锂盐改性石墨样品在循环过程中的应力应变曲线图，不同组成的Li2SiO3/Li2CO3复合锂盐都能提高石墨的电化学性能，而且能有效降低石墨循环过程中的形变和应力。
实施例2
采用LiNO3和Li3PO4复合锂盐对硫S进行改性，将硫S粉与LiNO3和Li3PO4按照S和Li的物质的量比为1:0.1（其中LiNO3和Li3PO4的物质的量比为2:1）进行配料混合，混合均匀后上面覆盖一层比表面积为2000m2/g活性炭防止硫S升华后挥发掉，然后在200°C的N2气氛中热处理1.0h，冷却后得到LiNO3和Li3PO4复合锂盐改性的硫S产品。
实施例3
采用Li2SiO3和Li3PO4对LiFePO4进行改性，将FePO4, SiO2, Li2CO3, Li2HPO4和葡萄糖按照物质的量比为1:0.05:0.5:0.02:0.1进行配料混合，混匀后移入600°C的惰性气氛管式炉中加热5~8h，冷却后得到Li2SiO3和Li3PO4复合锂盐改性的LiFePO4产品。
Claims (2)
1.一种复合锂盐改性电极材料的方法，其特征在于：采用原位合成法由Li4SiO4制备Li2SiO3/Li2CO3复合锂盐改性石墨，首先将石墨和Li4SiO4进行配料，配料后的混合物通过200rpm转速的机械球磨使二者充分混合，然后将该混合物在500～600℃的Ar气氛中热处理5.0h，冷却后得到Li2SiO3/Li2CO3复合锂盐改性石墨材料。
2.一种复合锂盐改性电极材料的方法，其特征在于：采用LiNO3和Li3PO4复合锂盐对硫S进行改性，将硫S粉与LiNO3和Li3PO4按照S和Li的物质的量比为1:0.1进行配料混合，其中LiNO3和Li3PO4的物质的量比为2:1，混合均匀后上面覆盖一层比表面积为2000m2/g活性炭防止硫S升华后挥发掉，然后在200℃的N2气氛中热处理1.0h，冷却后得到LiNO3和Li3PO4复合锂盐改性的硫S材料。
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