TWI617073B - 電池電極結構及其製作方法 - Google Patents
電池電極結構及其製作方法 Download PDFInfo
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- TWI617073B TWI617073B TW105138869A TW105138869A TWI617073B TW I617073 B TWI617073 B TW I617073B TW 105138869 A TW105138869 A TW 105138869A TW 105138869 A TW105138869 A TW 105138869A TW I617073 B TWI617073 B TW I617073B
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- conductive layer
- battery electrode
- electrode structure
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- 238000000034 method Methods 0.000 title claims description 24
- 239000002245 particle Substances 0.000 claims abstract description 104
- 239000000758 substrate Substances 0.000 claims abstract description 68
- 238000006243 chemical reaction Methods 0.000 claims description 52
- 239000000843 powder Substances 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 36
- 238000004519 manufacturing process Methods 0.000 claims description 31
- 239000004020 conductor Substances 0.000 claims description 28
- 239000010949 copper Substances 0.000 claims description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 229910052802 copper Inorganic materials 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 238000010894 electron beam technology Methods 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010405 anode material Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 claims description 4
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims description 4
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 239000010406 cathode material Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims 3
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910000990 Ni alloy Inorganic materials 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000000110 selective laser sintering Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000006183 anode active material Substances 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000007581 slurry coating method Methods 0.000 description 3
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 2
- VUCPPBKKLBYOBY-UHFFFAOYSA-N [Si].[Cu].[C] Chemical compound [Si].[Cu].[C] VUCPPBKKLBYOBY-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- WCCJDBZJUYKDBF-UHFFFAOYSA-N copper silicon Chemical compound [Si].[Cu] WCCJDBZJUYKDBF-UHFFFAOYSA-N 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000011856 silicon-based particle Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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Abstract
一種電池電極結構,包括:一基材、第一導電層以及複數個反應粒子。基材具有一個基材表面。第一導電層位於基材表面上。每一個反應粒子具有第一部分以及第二部分。其中,第一部分與第一導電層的表面共形結合(conformally engaged);第二部分突出於第一導電層的表面。
Description
本說明書所揭露的是關於一種電池電極結構及其製作方法。
隨著資訊電信產與行動裝置產業之發展,電子裝置持續地小型化、輕量化、薄型化、與可攜帶化,用來提供可攜式電子裝置操作電力的電池需求也隨之增加。二次電池(secondary battery)具有可充放電、高能量密度(energy density)、高電壓及長循環壽命等技術優勢,目前已廣泛應用於行動電話、筆記型電腦(notebook)等行動裝置類用、電動汽車用等的電源。
典型的二次電池,以鋰二次電池為例,是由陰極、陽極、電解質溶液及提供陰極與陽極之間的鋰離子傳輸路徑之分隔件所構成,當鋰離子從陰極活性材料(例如鋰金屬氧化物)離開而遷移到陽極活性材料(例如石墨系材料)時,會發生氧化還原反應而產生電能,並形成化合物嵌入(Intercalation)陽極活性材料中
間層內。習知的陰極和陽極結構,一般係採用漿料塗佈技術將陰極和陽極活性材料和導電碳黑與黏著劑混合直接塗佈於導電基板上。
由於活性材料緻密度會影響電容量,採用漿料塗佈技術製作具高緻密度活性材料的陰極和陽極結構是一大挑戰。加上,漿料中的黏著劑會影響電流的傳輸效率,因此欲藉由增加活性材料的厚度來提高二次電池的電容量有其極限,導致陰極和陽極結構的電容量不易擴充。
因此,本領域亟需一種具高緻密度活性材料、低黏著劑的電池電極結構及其製作方法。
本說明書中的一實施例是在提供一種電池電極結構,包括:一基材、第一導電層以及複數個反應粒子。基材具有一個基材表面。第一導電層位於基材表面上。每一個反應粒子具有第一部分以及第二部分。其中,第一部分與第一導電層的表面共形結合(conformally engaged);第二部分突出於第一導電層的表面。
在本說明書的另一個實施例是提供一種電池電極結構的製作方法,包括下述步驟:首先提供基材,並於該基材表面形成第一導電層。接著,燒結/熔融複數個反應粒子,使每一個反應粒子的第一部分與第一導電層的表面共形結合,並使每一個反
應粒子的第二部分突出於第一導電層的表面。
100、400、500、600、700、800、900、1000‧‧‧電池電極結構
101‧‧‧基材
101a‧‧‧基材表面
102、202、202’、202”、302、302’、302”、302'''、502、602、702、802、902‧‧‧圖案化導電層
102a、202a、202a’、202a”、302a、302a’、502a、602a、702a、802a‧‧‧導電凸塊
102b、302b、302b’、302b”、502b‧‧‧開口
102c、202c、202’、202”、502c‧‧‧立壁
103‧‧‧反應材料粉體
104、104’、404、404’‧‧‧反應粒子
104a、404a‧‧‧反應粒子的第一部分
104b、404b‧‧‧反應粒子的第二部分
104c、404c‧‧‧反應粒子的第三部分
104d、404d‧‧‧反應粒子的第四部分
105‧‧‧其他導電材料
106‧‧‧聚焦能量束
107‧‧‧凹室
108‧‧‧導電材料粉體
404f‧‧‧合金界面
θ1、θ2、θ2’、θ2”‧‧‧非平角
為了對本發明之上述實施例及其他目的、特徵和優點能更明顯易懂,特舉數個較佳實施例,並配合所附圖式,作詳細說明如下:第1A圖至第1E圖係根據本說明書的一實施例所繪示的一種電池電極結構的製程結構剖面圖;第2A圖至第2C圖係根據本說明書的不同實施例,分別繪示不同圖案化導電層的結構剖面圖;第3A圖至第3D圖係根據本說明書的不同實施例,分別繪示不同圖案化導電層的結構上視圖;第4圖係根據本說明書的一實施例所繪示的一種電池電極結構的結構剖面圖;第5A圖至第5D圖係根據本說明書的一實施例所繪示的一種電池電極結構的製程結構剖面圖;第6圖係根據本說明書的一實施例所繪示具有多個堆疊圖案化導電層之電池電極結構的部分結構透視圖;第7圖係根據本說明書的一實施例所繪示具有多個堆疊圖案化導電層之電池電極結構的部分結構透視圖;第8圖係根據本說明書的一實施例所繪示具有多個堆疊圖案化導電層之電池電極結構的部分結構透視圖;
第9A圖至第9E圖係根據本說明書的一實施例所繪示的一種電池電極結構的製程結構剖面圖;第10A圖至第10C圖係根據本說明書的再一實施例所繪示的一種電池電極結構的製程結構剖面圖。
本說明書所揭露的實施例是有關於一種電池電極的結構及其製作方法。為讓本發明之上述目的、特徵和優點能更明顯易懂,特舉數個實施例,並配合所附圖式詳細描述如下。
但必須注意的是,這些特定的實施案例與方法,並非用以限定本發明。本發明仍可採用其他特徵、元件、方法及參數來加以實施。較佳實施例的提出,僅係用以例示本發明的技術特徵,並非用以限定本發明的申請專利範圍。該技術領域中具有通常知識者,將可根據以下說明書的描述,在不脫離本發明的精神範圍內,作均等的修飾與變化。在不同實施例與圖式之中,相同的元件,將以相同的元件符號加以表示。
請參照第1A圖至第1E圖,第1A圖至第1E圖係根據本說明書的一實施例所繪示的一種電池電極結構100的製程結構剖面圖。製作電池電極結構100的方法包括下述步驟:首先提供基材101(如第1A圖所繪示)。在本說明書的一些實施例中,電池電極結構100的基材101可以是一種導電板材,例如包含銅、鋁或其他合適金屬元素的金屬板材。
接著,於基材101的表面101a上形成圖案化導電層102(如第1B圖所繪示)。在本說明書的一些實施例中,圖案化導電層102的製作方法可以包括下述步驟:先提供導電材料粉體108(例如,鈦(Ti)、金(Gu)、銀(Ag)、鐵(Fe)、鋁(Al)、銅(Cu)或前述之元素為主元素之合金材料,以及任意組合所構成的複合金屬粉體)全面地平鋪於基材表面101a。再以雷射、電子束、電弧或上述任意組合來提供一個聚焦能量束106,對這些導電材料粉體108進行燒結/熔融。然後,再移除未被燒結/熔融的導電材料粉體108。
在本說明書的一實施例中,聚焦能量束106並非對平鋪於基材表面101a的導電材料粉體108進行全面性的燒結/熔融。而是根據預設的雷射掃描路徑來對平鋪於基材表面101a的導電材料粉體108進行燒結/熔融。因此聚焦能量束106只會聚焦在特定區域的導電材料粉體108上,藉以在基材表面101a上形成具有複數個金屬凸塊102a的圖案化導電層102。
提供聚焦能量束106對導電材料粉體108進行燒結/熔融的方式,包括大氣電漿熔射(Air Plasma Spray,APS)法、選擇性雷射燒結(Selective Laser Sintering,SLS)、直接金屬雷射燒結(Direct Metal Laser Sintering,DMSL)、選擇性雷射熔融(Selective Laser Melting,SLM)、電子束熔融(Electron Beam Melting,EBM)或上述之方法的任意組合來對這些導電材料粉體進行燒結/熔融與固化成型。而在本實施例中,則是採用40W的長型光斑雷射,
對這些導電材料粉體進行燒結/熔融,以形成圖案化導電層102。
然而,圖案化導電層102的製作方法並不以此為限。例如,在本說明書的一些實施例中,圖案化導電層102的製作方可以包括下述步驟:採用沉積製程,例如先採用物理氣相沉積或化學氣相沉積(Chemical Vapor Deposition,CVD)製程於基材表面101a形成一導電材料層(未繪示)。之後,再藉由進光罩蝕刻製程來移除一部分的導電材料層,以形成具有複數個金屬凸塊102a的圖案化導電層102。
其中,圖案化導電層102的每一個金屬凸塊102a具有至少一個立壁102c可與基材表面101a夾一個非平角θ。例如,在本實施例中,圖案化導電層102之金屬凸塊102a的立壁102c與基材表面101a直交,形成一個實質為90°的非平角θ1。但金屬凸塊102a的形狀並不以此為限,而是可根據電池電極結構100的不同設計而有所不同。
例如請參照第2A圖至第2E圖,第2A圖至第2E圖係根據本說明書的不同實施例,分別繪示不同圖案化導電層202、202’和202”的結構剖面圖。其中,每一個導電凸塊202a的形狀不同,立壁202c的表面可以是平面(如第2B圖所繪示的立壁202c’)、曲面(如第2C圖所繪示的立壁202c”)或上述二者之組合(如第2A圖所繪示的立壁202c)。導電凸塊202a、202a’和202a”的側壁202c、202c’或202”之輪廓的切線,分別與基材101的表面101a形成一個非平角θ2、θ2’和θ2”。
圖案化導電層102的複數個金屬凸塊102a可定義出一個網格(grid)結構,而將一部分的基材表面101a由網格結構的開口102b暴露於外。在本說明書的其他實施例中,網格結構開口102b的平均口徑實質介於10微米(μm)至200微米之間。網格結構的形式,請參照第3A圖至第3D圖,第3A圖至第3D圖係根據本說明書的不同實施例,分別繪示不同圖案化導電層302、302’、302”和302'''的結構上視圖。
在第3A圖所繪示的實施例中,圖案化導電層302包括由複數個彼此直交的條狀導電凸塊302a所定義出的網格結構。其中,網格結構具有複數個規律排列,且尺寸相同的方形開口302b。在第3B圖所繪示的實施例中,圖案化導電層302’包括由複數個彼此交叉的條狀導電凸塊302a’所定義出的網格結構。其中,網格結構具有複數個規律排列,且尺寸相同的菱形開口302b’。在第3C圖所繪示的實施例中,圖案化導電層302”包括由網狀導電凸塊302a’所定義出的網格結構。其中,網格結構具有複數個規律排列之六邊形開口302b”。在第3D圖所繪示的實施例中,圖案化導電層302'''包括由網狀導電凸塊302a'''所定義出的網格結構。其中,網格結構具有多個不對稱五角形開口302b'''所排列而成的花紋結構。
值得注意的是,圖案化導電層102之網格結構的形態並不以此為限。在本說明書的其他實施例中,圖案化導電層102的網格結構,可以包含複數個規則或不規則排列的開口,且這些
開口可以具有相同或不同的形狀。
接著,提供包含有複數個反應粒子104的反應材料粉體103覆蓋於圖案化導電層102和由開口102b所暴露的一部分基材表面101a上(如第1C圖所繪示)。在本說明書的一些實施例中,反應粒子104包括一種陽極材料,其可選自於由鋰、碳、矽、鎂、銅、鎳、鋁、鈦、錫等一或多種上述元素所組成之合金或氧化物,或上述材料所組成之複合材料。例如,反應粒子104可以是:多孔性矽碳(Si-C)陶瓷顆粒、矽碳銅(Si-C-Cu)陶瓷顆粒、矽銅(Si-Cu)陶瓷顆粒、鎂/鎳/矽陶瓷顆粒、鎂/鎳合金顆粒或上述顆粒的任意組合。反應粒子104的平均粒徑實質介於1微米至10微米之間。
而在本說明書的另一些實施例中,反應粒子104包含一陰極材料,係選自於由鋰鈷系、磷酸鋰鐵(lithium iron phosphate,LiFePO4)、磷酸鋰錳(lithium manganese iron phosphate,LiMnPO4)、鋰錳系、鋰鎳系、鋰鈷鎳錳三元系等鋰系氧化物或化合物,及上述任意組合所組成的複合材料。例如,反應粒子104可以是磷酸鋰鐵陶瓷顆粒、磷酸鋰錳陶瓷顆粒、鋰/錳合金顆粒、鋰/鎳合金顆粒或上述顆粒之任意組合。另外,反應材料粉體103中還可包括其他導電材料105。例如重量百分比含量實值介於0.5至20之間的鋁、銅或二者的合金。
然後,提供聚焦能量束106對反應材料粉體103進行燒結/熔融,藉以將反應材料粉體103中的反應粒子104共形地
結合在圖案化導電層102的立壁102c表面上(如第1D圖所繪示)。在本實施例中,聚焦能量束106係對覆蓋於圖案化導電層102和基材表面101a上的反應材料粉體103進行全面式燒結/熔融,使燒結/熔融後的反應粒子104可共形地結合在圖案化導電層102的立壁102c表面上,以及共形地結合在由開口102b暴露於外的一部分基材表面101a上。在本說明書的一些實施例中,聚焦能量束106可以僅沿著預設的雷射掃描路徑來對覆蓋於圖案化導電層102上的反應材料粉體103進行部分的燒結/熔融。因此,燒結/熔融後的反應粒子104僅會共形地結合在圖案化導電層102的立壁102c表面上。
提供聚焦能量束106對反應材料粉體103進行燒結/熔融的方式,包括大氣電漿熔射、選擇性雷射燒結、直接金屬雷射燒結、選擇性雷射熔融、電子束熔融或上述之方法的任意組合來對這些導電材料粉體進行燒結/熔融與固化成型。而在本實施例中,則是採用功率範圍實值介於5至100W的選擇性雷射燒結,對反應材料粉體103進行全面性的燒結/熔融,以使燒結/熔融後的反應粒子104可共形地結合在圖案化導電層102的立壁102c表面上,以及共形地結合在由開口102b暴露於外的一部分基材表面101a上。
被燒結/熔融後共形地結合在圖案化導電層102立壁102c表面上的每一個反應粒子104包括一第一部分104a以及一第二部分104b。其中,第一部分104a會與其所接觸的立壁102c
表面或基材表面101a共形結合;而第二部分104b則突出於立壁102c的表面或基材表面101a。被燒結/熔融後共形地結合在基材表面101a上的每一個反應粒子104’包括一第三部分104c以及一第四部分104d。其中,第三部分104c會與暴露於外的一部分基材表面101a共形結合;第四部分104d突出於暴露於外的基材表面101a。其中,反應粒子104和104’與圖案化導電層102或基材101的結合方式,會因為反應粒子104以及與其結合之圖案化導電層102和/或基材101的材料不同而有所差異。
詳言之,例如當採用磷酸鋰鐵陶瓷顆粒來作為反應粒子104進行燒結,將反應粒子104和104’結合在鋁質基材表面101a以及具有銅質網格結構之圖案化導電層102的立壁102c表面上時。由於反應粒子104和104’屬於(磷酸鋰鐵)陶瓷結構,在燒結/熔融過程中仍呈現固態形式,因此一部分的反應粒子104(第一部分104a和第三部分104c)會陷入熔融態的鋁質基材表面101a或銅質網格結構的立壁102c表面;而在鋁質基材101或銅質網格結構的立壁102c中定義出一個凹室107。待固化成型之後,反應粒子104和104’的第一部分104a和第三部分104c會共形地嵌設於凹室107之中。另一部分的反應粒子104(第二部分104b和第四部分104d)則會向凹室107外部延伸,凸設於鋁質基材表面101a或銅質網格結構之的立壁102c表面上。
又例如,當採用鎂/鎳合金顆粒來作為反應粒子404和404’進行燒結,將反應粒子404結合在銅質基材表面101a以
及具有銅質網格結構之圖案化導電層102的立壁102c表面上時(如第4圖所繪示)。由於,反應粒子404和404’屬於(鎂/鎳)合金結構,在燒結/熔融過程中有一部分的反應粒子404(第一部分404a和第三部分404c)呈現熔融態,會與基材表面101a或銅質網格結構的立壁102c表面熔融態的銅質進行混合,待固化成型之後,會產生一個合金界面404f由基材表面101a或立壁102c的表面延伸進入基材101或銅質網格結構之中,或者共形地包覆在銅質基材表面101a以及銅質網格結構之立壁102c的表面上。另一部分的反應粒子404(第二部分404b和第四部分404d)則會,凸設於銅質基材表面101a或銅質網格結構之立壁102c的表面上。
後續,移除未被燒結/熔融反應材料粉體103,即可完成如第1E圖所繪示的電池電極結構100。由於,陶瓷材料的反應粒子104係直接嵌設在圖案化導電層102的立壁102c或基材101之中(第1E圖所繪示),或者直接延伸進入圖案化導電層102的立壁102c或基材101之中(如第4圖所繪示的反應粒子404),而與圖案化導電層102或基材101緊密結合。因此,在電池充放電過程中較不易因為反應離子(例如,鋰離子)的嵌入與釋放而鬆脫掉落,影響電池的使用壽命。
若將採用漿料塗佈技術所製作而成的電池電極結構當作比較例,與前述實施例的電池電極結構100與來進行比較,可發現,當電池電極結構100與比較例具有相同厚實,電池電極結構100的電容量高於比較例的電容量約20%至40%。另外,由
於反應粒子104可與圖案化導電層102及導電基板101電性接觸,不會影響電流的傳輸效率。因此,可藉由增加反應粒子的密度、圖案化導電層102的厚度或圖案化導電層102的立壁102c表面積來增加電池的電容量。
例如在本說明書的一些實施例中,可藉由增加圖案化導電層的堆疊層數來增加電池的電容量。請參照第5A圖至第5D圖,第5A圖至第5D圖係根據本說明書的另一實施例所繪示的一種電池電極結構500的製程結構剖面圖。電池電極結構500的製程係接續第1D圖所繪示的電池電極結構100,包括下述步驟:首先提供導電材料粉體108,全面地平鋪於基材表面101a,並且覆蓋圖案化導電層102(如第5A圖所繪示)。
接著,再以雷射、電子束、電弧或上述任意組合來提供一個聚焦能量束106,沿著預設的雷射掃描路徑來對這些導電材料粉體108進行燒結/熔融,藉以在圖案化導電層102上形成另一個具有網格結構的圖案化導電層502(如第5B圖所繪示)。其中,圖案化導電層502的網格結構具有複數個開口502b,且每一個開口502b與圖案化導電層102之網格結構的一個開口102b相互對應,並至少部分重疊。在本說明書的一些實施例中,圖案化導電層502之網格結構的開口502b可以與對應開口102b完全重疊。
移除未被燒結/熔融的導電材料粉體108之後,提供包含有複數個反應粒子104的反應材料粉體103覆蓋於圖案化導
電層502和由開口502b暴露於外的一部分基材表面101a上。並提供聚焦能量束106對反應材料粉體103進行燒結/熔融,藉以將反應材料粉體103中的反應粒子104共形地結合在圖案化導電層502的立壁502c表面上(如第5C圖所繪示)。後續,移除未被燒結/熔融反應材料粉體103即可完成如第5D圖所繪示的電池電極結構500。
但圖案化導電層的堆疊方式並不以此為限。例如請參照第6圖、第7圖和第8圖,第6圖、第7圖和第8圖係根據本說明書的實施例分別繪示具有多個堆疊圖案化導電層之電池電極結構600、700和800的部分結構透視圖。其中,電池電極結構600、700和800分別包含至少兩個上下堆疊的圖案化導電層。且構成圖案化導電層的網格結構並非以彼此重合的方式相互堆疊。
例如在第6圖中,構成上層圖案化導電層602之網格結構的條狀導電凸塊602a與構成下層圖案化導電層602之網格結構的條狀導電凸塊602a係以60°角彼此交叉重疊,形成一個彼此交錯的堆疊架構。又例如在第7圖,構成上層圖案化導電層702之網格結構的條狀導電凸塊702a和構成圖案化導電層702之網格結構的導電凸塊702a係以彼此垂直的方式相互堆疊,形成一個彼此直交的堆疊架構。另外如第8圖所繪示,電池電極結構800可以包括複數個由網狀圖塊802a所構成的圖案化導電層802。這些圖案化導電層802又相互堆疊形成多面體立體架構。
請參照第9A圖至第9E圖,第9A圖至第9E圖係根據本說明書的又一實施例所繪示的一種電池電極結構900的製程結構剖面圖。製作電池電極結構900的方法包括下述步驟:首先提供基材101。接著,於基材101的表面101a上形成導電層902。
在本說明書的一些實施例中,導電層902的製作方法可以包括下述步驟:先提供導電材料粉體108(例如,鈦、金、銀、鐵或前述之任意組合所構成的金屬粉體)全面地平鋪於基材表面101a(如第9A圖所繪示)。再以雷射、電子束、電弧或上述任意組合來提供一個聚焦能量束106,對這些導電材料粉體108進行全面的燒結/熔融,藉以在基材表面101a上形成一個燒結/熔融的金屬薄膜。然後,再移除未被燒結/熔融的導電材料粉體108(如第9B圖所繪示)。
接著,提供包含有複數個反應粒子104的反應材料粉體103覆蓋於導電層902上(如第9C圖所繪示)。其中,反應粒子104可以是由包括鋰、碳、矽、鎂、銅、鎳、鋁、鈦、錫的陽極材料所構成。例如,多孔性矽碳顆粒、矽碳銅顆粒、矽銅顆粒、鎂/鎳/矽顆粒、鎂/鎳合金顆粒或上述顆粒的任意組合所構成的陽極材料。反應粒子104也可以是由選自於由鋰鈷系、磷酸鋰鐵、磷酸鋰錳、鋰錳系、鋰鎳系、鋰鈷鎳錳三元系等鋰系氧化物或化合物,及上述任意組合所組成的陰極複合材料所構成。另外,反應材料粉體103中還包括重量百分比含量實值介於0.5至20之間,材質為鋁、銅或以該兩種元素為主元素之合金的其他導電材
料105。
然後,提供聚焦能量束106對反應材料粉體103進行燒結/熔融,藉以將反應材料粉體103中的反應粒子104共形地結合在導電層902的表面上(如第9D圖所繪示)。在本實施例中,聚焦能量束106係對覆蓋於導電層902上的反應材料粉體103進行全面的燒結/熔融。被燒結/熔融後的反應粒子104會共形地結合在導電層902的表面上。且每一個反應粒子104包括一第一部分104a以及一第二部分104b。其中,第一部分104a會與其所接觸的導電層902表面共形結合;而第二部分104b則突出於導電層902表面。
後續,移除未被燒結/熔融反應材料粉體103即可完成如第9E圖所繪示的電池電極結構900。由於,陶瓷材料的反應粒子104係直接嵌設在導電層902之中(如第4圖所繪示的反應粒子404),而與圖案化導電層902緊密結合。因此,在電池充放電過程中較不易因為反應離子(例如,鋰離子)的嵌入與釋放而鬆脫掉落,影響電池的使用壽命。
在本說明書的一些實施例中,更可藉由增加反應粒子104的堆疊厚度來增加電池的電容量。例如請參照第10A圖至第10C圖,第10A圖至第10C圖係根據本說明書的再一實施例所繪示的一種電池電極結構1000的製程結構剖面圖。電池電極結構1000的製程係接續第9E圖所繪示的電池電極結構900,包括下述步驟:
首先提供包含有複數個反應粒子104和含量較多之其他導電材料105的反應材料粉體103,覆蓋於已結合了複數個反應粒子104的導電層902表面上(如第10A圖所繪示)。接著,提供聚焦能量束106對反應材料粉體103進行燒結/熔融,藉以在導電層902的表面上共形成反應粒子104的堆疊結構(如第10B圖所繪示)。後續,移除未被燒結/熔融反應材料粉體103即可完成如第10C圖所繪示的電池電極結構1000。
在本實施例中,聚焦能量束106係沿著預設的雷射掃描路徑來對反應材料粉體103進行燒結/熔融,藉以在導電層902的表面上形成反應粒子104的立體堆疊圖案。而在本說明書的另一些實施例中,聚焦能量束106可以對反應材料粉體103進行全面的燒結/熔融,藉以在導電層902的表面上共形具有相當厚度的反應粒子層(未繪示)。
根據上述,本說明書的實施例是揭露一種電池的電池電極結構及其製作方法。其係先在電極的導電基板上形成一導電層;再藉由燒結/熔融的方式,將複數個反應粒子的一部分共形地結合在導電層的表面上,並使反應粒子的另一部分突出於導電層的表面之外。
由於,反應粒子係共形地結合在導電層的表面之上,可防止反應粒子在充放電過程中,因為反應離子(例如,鋰離子)的嵌入與釋放而鬆脫掉落,影響電池的使用壽命。另外,由於反應粒子與圖案化導電層以及導電基板係直接電性接觸,並不會
影響電流的傳輸效率。因此,可藉由增加反應粒子的分佈密度、圖案化導電層的厚度或圖案化導電層的堆疊的層數來增加電池的電容量。達到降低製造成本、提高電池的電容量與使用壽命的目的。
雖然本說明書已以較佳實施例揭露如上,然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可作各種之更動與潤飾。因此,本發明之保護範圍當視後附之申請專利範圍所界定者為準。
100‧‧‧電池電極結構
101‧‧‧基材
101a‧‧‧基材表面
102‧‧‧圖案化導電層
102a‧‧‧導電凸塊
102b‧‧‧開口
102c‧‧‧立壁
104、104’‧‧‧反應粒子
104a‧‧‧反應粒子的第一部分
104b‧‧‧反應粒子的第二部分
104c‧‧‧反應粒子的第三部分
104d‧‧‧反應粒子的第四部分
107‧‧‧凹室
Claims (20)
- 一種電池電極結構,包括:一基材具有一基材表面;一第一導電層,位於該基材表面上,且具有一表面;以及複數個第一反應粒子,其中每一該些第一反應粒子具有一第一部分以及一第二部分,該第一部分與該第一導電層的該表面共形結合(conformally engaged);且該第二部分突出於第一導電層的該表面。
- 如申請專利範圍第1項所述之電池電極結構,其中該第一導電層係一圖案化導電層,具有至少一導電凸塊與該基材表面夾一非平角。
- 如申請專利範圍第2項所述之電池電極結構,其中該至少一導電凸塊定義出一第一網格(grid)結構,具有複數個第一開口,將一部分該基材表面暴露於外。
- 如申請專利範圍第3項所述之電池電極結構,更包括複數個第二反應粒子,其中每一該些第二反應粒子具有一第三部分以及一第四部分,該第三部分與暴露於外的一部分該基材表面共形結合;該第四部分突出於暴露於外的該基材表面。
- 如申請專利範圍第3項所述之電池電極結構,其中該些第一開口具有實質介於10微米(μm)至200微米的一平均口徑,該些第一反應粒子具有實質介於1微米至10微米的一平均粒徑。
- 如申請專利範圍第3項所述之電池電極結構,更包括一第二導電層位於該第一導電層上,以定義出一第二網格結構,具有複數個第二開口;每一該些第二開口與該些第一開口之一者對應,且至少部分重疊。
- 如申請專利範圍第2項所述之電池電極結構,其中每一該些第一反應粒子包括一陶瓷材料;該第一部分係共形嵌設於該導電凸塊的一凹室中,且該第二部分係向外延伸突出至該凹室之外。
- 如申請專利範圍第2項所述之電池電極結構,其中每一該些第一反應粒子包括一金屬材料;該第一部分具有一合金界面,由該導電凸塊的一表面共形地延伸進入於該導電凸塊之中,且該第二部分突出於該導電凸塊的該表面。
- 如申請專利範圍第1項所述之電池電極結構,其中該些第一反應粒子包括一陽極材料,係選自於由鋰、碳、矽、鎂、銅、鎳、鋁、鈦、錫及上述任意組合所組成之一族群。
- 如申請專利範圍第1項所述之電池電極結構,其中該些第一反應粒子包括一陰極材料,係選自於由鋰鈷系、磷酸鋰鐵、磷酸鋰錳、鋰錳系、鋰鎳系、鋰鈷鎳錳三元系氧化物及化合物,及上述任意組合所組成的一族群。
- 如申請專利範圍第1項所述之電池電極結構,其中該第一導電層包括一金屬材料,係選自於由鋁、銅、銀、金及上述任意組合所組成的一族群。
- 一種電池電極結構的製作方法,包括:提供一基材,其具有一基材表面;於該基材表面形成一第一導電層;以及燒結/熔融複數個反應粒子,使每一該些反應粒子的一第一部分與該第一導電層的一表面共形結合,並使每一該些反應粒子的一第二部分突出於該第一導電層的該表面。
- 如申請專利範圍第12項所述之電池電極結構的製作方法,其中形成該第一導電層的步驟,包括:提供一導電材料粉體於該基材表面;以及提供一聚焦能量束於該導電材料粉體,使該導電材料粉體燒結/熔融於該基材表面。
- 如申請專利範圍第13項所述之電池電極結構的製作方法,其中形成該第一導電層的步驟,包括:使該聚焦能量束沿著一預設雷射掃描路徑對該導電材料粉體進行燒結/熔融,以形成複數個導電凸塊與該基材表面夾一非平角,並定義出具有複數個第一開口的一第一網格結構。
- 如申請專利範圍第14項所述之電池電極結構的製作方法,其中燒結/熔融該些反應粒子的步驟包括:提供一反應材料粉體覆蓋於該第一導電層上;以及提供一聚焦能量束於該反應材料粉體上。
- 如申請專利範圍第15項所述之電池電極結構的製作方法,在燒結/熔融該些反應粒子之後,更包括:於該第一導電層上形成一第二導電層,以定義出具有複數個第二開口的一第二網格結構;使每一該些第二開口與該些第一開口之一者對應,且至少部分重疊;提供該反應材料粉體於該第二導電層上;以及提供一聚焦能量束於該反應材料粉體上。
- 如申請專利範圍第15項所述之電池電極結構的製作方法,其中該聚焦能量束係選自於由雷射、電子束、電弧和上述任意組 合所組成的一族群。
- 如申請專利範圍第12項所述之電池電極結構的製作方法,其中該些反應粒子包括一陽極材料,係選自於由鋰、碳、矽、鎂、銅、鎳、鋁、鈦、錫,及上述之任意組合所組成的一族群。
- 如申請專利範圍第12項所述之電池電極結構的製作方法,其中該些反應粒子包括一陰極材料,係選自於由鋰鈷系、磷酸鋰鐵、磷酸鋰錳、鋰錳系、鋰鎳系、鋰鈷鎳錳三元系氧化物和化合物,及上述任意組合所組成的一族群。
- 如申請專利範圍第12項所述之電池電極結構的製作方法,其中該第一導電層包括一金屬材料,係選自於由鋁、銅、銀、金,及上述任意組合所組成的一族群。
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